bluuebunny/crossref_metadata_2025 huggingface dataset:
Scar Assessment After Breast Reconstruction
Authors: Suga Hirotaka , Shiraishi Tomohiro , Takushima Akihiko
Published: February 2020

Background

Breast scars after breast reconstruction can be hypertrophic and/or hyperpigmented, especially in Asian patients, whose skin is thicker and has increased melanin. Few studies have focused on breast scars after breast reconstruction, and the risk factors for an abnormal breast scar remain unknown.

Methods

We examined 257 Asian patients who underwent an immediate 2-stage unilateral implant-based breast reconstruction. Vascularity, hypertrophy, and hyperpigmentation of the patients' breast scars were assessed at 1 year postoperatively. Risk factors for an abnormal scar were analyzed statistically. Analyzed patient factors included age, body mass index, incision site (frontal or lateral), breast size (the weight of the resected specimen), skin necrosis at the initial operation (expander placement), and adjuvant therapy.

Results

At 1 year postoperatively, 161 patients (63%) showed normal vascularity, 77 patients (30%) showed mild vascularity, 18 patients (7%) showed moderate vascularity, and 1 patient (0.4%) showed severe vascularity. No patient factors were correlated with vascularity. Thirty-two patients (12%) showed hypertrophy, and the rate of hypertrophy was significantly higher in the patients with a lateral incision (n = 59) compared with those with a frontal incision (n = 198) (28.8% vs 7.6%, P < 0.01). Even in the frontal incision group, a lateral part of the frontal scar was likely to be hypertrophic. Forty-six patients (18%) showed hyperpigmentation, and the rate of hyperpigmentation was significantly higher in the patients with skin necrosis (n = 47) at the initial operation than those without skin necrosis (n = 210) (57.4% vs 9.0%, P < 0.01). Large breast was also a risk factor for hyperpigmentation due to its higher frequency of skin necrosis.

Conclusions

In Asian patients who undergo breast reconstruction, the use of a lateral incision is a risk factor for hypertrophy, and skin necrosis at the initial operation is a risk factor for hyperpigmentation at the breast scar.
A Comparison of Gender-Affirming Chest Surgery in Nonbinary Versus Transmasculine Patients
Authors: McTernan Melissa , Yokoo Karen , Tong Winnie
Published: February 2020

Background

Increasingly more nonbinary patients are obtaining better access for gender-affirming chest surgery (top surgery), representing an important subset of patients who undergo such surgery.

Objective

We review our experience at gender-affirming chest surgery in nonbinary versus transmasculine patients in an integrated health care setting.

Methods

We performed a retrospective study of nonbinary and transmasculine patients who underwent gender-affirming chest surgery from May 1, 2012, to December 27, 2017.

Results

There were 111 nonbinary patients and 665 transmasculine patients included in the final analyses. Nonbinary patients were more likely to seek more than 1 surgical consultations than transmasculine patients (24.3% vs 1.7%, respectively, P < 0.0001). More nonbinary patients (17.3%) indicated nipple sensation to be important relative to their transmasculine counterparts (0.4%, P < 0.0001). Fewer nonbinary patients were on testosterone before surgery (33.64%) in comparison to transmasculine patients (86.14%, P < 0.0001). When only prior reduction mammaplasty or top surgery were considered, nonbinary patients (8.1%) were more likely than transmasculine patients (3.5%) to have had a prior chest surgery. When evaluating patients who did not have prior chest surgery before undergoing top surgery at our institution (n = 721), rates of major complications, minor complications, as well as revisions, were comparable between nonbinary and transmasculine patients.

Conclusions

This study demonstrated that more nonbinary patients requested nonflat chests relative to their transmasculine counterparts. Both groups in our sample displayed comparable rates of complications after top surgery.
Comparison of the Effects of Acellular Dermal Matrix and Montelukast on Radiation-Induced Peri-implant Capsular Formation in Rabbits
Authors: Woo Soo Hyun , Kim Woo Seob , Bae Tae Hui , Kim Mi Kyung , Park Suk Won , Kim Han Koo
Published: February 2020

Purpose

Capsular contracture (CC) is a troublesome complication after breast surgery with breast implants, and the risk increases in breast cancer patients after radiotherapy. Studies investigating leukotriene antagonists (eg, montelukast, zafirlukast) found that the acellular dermal matrix (ADM) can help prevent CC. We aimed to compare the effects of ADM and montelukast on CC after irradiation.

Methods

Eighteen New Zealand white rabbits were randomly divided into 3 groups of 6 each. Miniature cohesive gel implants were inserted into the pocket under the latissimus dorsi muscle. The lateral part was uncovered by the latissimus dorsi muscle. Six animals were included in the control group. In experimental group A (EG-A) (n = 6), the site was partially wrapped with ADM but not covered with muscle. Montelukast (Singulair, 0.2 mg/kg) was administered in experimental group B (EG-B) (n = 6) daily. Groups were irradiated at postoperative day 21 with Co-60 γ rays (25 Gy, single fraction) at the peri-implant area. Rabbits were sacrificed 12 weeks after surgery; implants with peri-implant capsule were harvested. Capsule thickness, collagen pattern, myofibroblast, and transforming growth factor (TGF) β1/2 levels in the peri-implant capsule were evaluated.

Results

On histological evaluation, the capsule was thinner on the lateral aspect (covered with ADM) in EG-A (P = 0.004) and the entire capsule in EG-B (P = 0.004) than in the control group. However, there was no significant difference between EG-A and EG-B (P = 0.073). The collagen distribution pattern was more parallel with low density in the lateral capsular aspect in EG-A, but in the entire capsule in EG-B. The myofibroblast amount (EG-A, P = 0.031; EG-B, P = 0.016) and levels of TGF-β1 and TGF-β2 were reduced in the experimental groups (TGF-β1, EG-A, P = 0.019; TGF-β1, EG-B, P = 0.045; TGF-β2, EG-A, P = 0.018; TGF-β2, EG-B, P = 0.022). There was no significant difference between EG-A and EG-B (myofibroblast, P = 0.201; TGF-β1, P = 0.665; TGF-β2, P = 0.665).

Conclusions

Acellular dermal matrix and montelukast have a prophylactic effect for CC even when the breast is irradiated. There was no significant difference between ADM and montelukast in preventing capsular formation. The difference is that ADM will only have the effect of covering the capsular formation with ADM and montelukast can cause systemic effects or complications.
Injectable Microannealed Porous Scaffold for Articular Cartilage Regeneration
Authors: Schaeffer Christine , Pfaff Blaise N. , Cornell Nicholas J. , Salopek Lisa S. , Shan Sarah , Viyar Jan , Omesiete Wilson , Griffin Donald R. , Cottler Patrick S. , DeGeorge Brent R.
Published: February 2020

Background

The purpose of this study is to assess the feasibility of a novel microporous annealed particle (MAP) scaffolding hydrogel to enable both articular cartilage and subchondral bone biointegration and chondrocyte regeneration in a rat knee osteochondral defect model.

Methods

An injectable, microporous scaffold was engineered and modified to match the mechanical properties of articular cartilage. Two experimental groups were utilized—negative saline control and MAP gel treatment group. Saline and MAP gel were injected into osteochondral defects created in the knees of Sprague-Dawley rats. Photo-annealing of the MAP gel was performed. Qualitative histologic and immunohistochemical analysis was performed of the treated defects at 2, 4, and 8 weeks postsurgery.

Results

The injectable MAP gel successfully annealed and was sustained within the osteochondral defect at each timepoint. Treatment with MAP gel resulted in maintained size of the osteochondral defect with evidence of tissue ingrowth and increased glycosaminoglycan production, whereas the control defects presented with evidence of disorganized scar tissue. Additionally, there was no significant inflammatory response to the MAP gel noted on histology.

Conclusions

We have demonstrated the successful delivery of an injectable, flowable MAP gel scaffold into a rat knee osteochondral defect with subsequent annealing and stable integration into the healing wound. The flowable nature of this scaffold allows for minimally invasive application, for example, via an arthroscopic approach for management of wrist arthritis. The MAP gel was noted to fill the osteochondral defect and maintain the defect dimensions and provide a continuous and smooth surface for cartilage regeneration, suggesting its ability to provide a stable scaffold for tissue ingrowth. Future chemical, mechanical, and biological gel modifications may improve objective evidence of cartilage regeneration.
Is Thoracodorsal Nerve Transection Needed in Latissimus Dorsi Breast Reconstruction?
Authors: Patel Ravi , Oberhofer Haley , O'Neill Daniel , Samant Sonja , Mast Bruce A.
Published: February 2020

Purpose

Latissimus dorsi (LD) breast reconstruction is of proven efficacy. Advantages of thoracodorsal nerve transection are potential prevention of muscle spasticity/movement; disadvantages are possible long-term muscle atrophy and volume loss. This study's purpose is to provide data that would support or refute nerve transection.

Methods

A retrospective study of all LD breast reconstruction patients from 2011 to 2017 was done. Total number of flaps was identified, as was thoracodorsal nerve transection. Outcomes were noted for symptomatic muscle spasticity/involuntary movement, and complications inclusive of hematoma, seroma, and capsular contracture.

Results

A total of 125 patients had 170 flaps. Eighty-one flaps had nerve transection; 89 did not. These cohorts had no differences in comorbidities, indications of surgery (cancer vs prophylactic), irradiation, delayed/immediate reconstruction, and use of expanders. Symptomatic muscle movement/spasticity was not significantly different: 3 (3.7%) of 78 in transection and 5 (5.6%) of 84 in nontransection (P = 0.55, χ2). Incidence of seroma in the transection group was notably higher (18/81; 22% vs 12%) but not statistically significant (P = 0.09, χ2). No differences existed in all other outcomes.

Conclusions

Symptomatic spasticity or involuntary muscle movement occurs in a small number of patients with LD breast reconstruction and is not affected by thoracodorsal nerve transection. Movement after transection is likely due to aberrant nerve innervation and reinnervation. The absence of movement without transection is due to disruption of muscle position and origin after transfer. Seroma formation may be affected by increased axillary dissection required for nerve transection. These data do not support nerve transection, and therefore, it is not recommended.
Changes in Lower Eyelid Position and Shape After Inferior Orbital Wall Reconstruction
Authors: Choi Min Gyu , Oh Ja Young , Lee Jeong Kyu
Published: February 2020

Purpose:

To use morphological measurements to analyze changes in the position and shape of the lower eyelid after inferior orbital wall reconstruction.

Methods: This study included 47 eyes from 47 patients with blowout fractures. Digital photographs were taken in primary gaze immediately before and after surgery; the degree of enophthalmos was recorded. Several eyelid parameters were measured, including marginal reflex distance 1 (MRD1), MRD2, lower eyelid length (LEL), lower medial palpebral fissure area, lower central palpebral fissure area (LCA), and lower lateral palpebral fissure area.

Results:

The exophthalmometry values (P < 0.001), MRD2 (P < 0.001), LEL (P < 0.001), LCA (P = 0.022), and lower lateral palpebral fissure area (P = 0.038) on the injured side before surgery were significantly smaller than those on the contralateral, uninjured side. Following surgery, the MRD2 increased from 5.01 ± 0.65 mm to 5.60 ± 0.78 mm (P < 0.001), LEL from 25.62 ± 2.11 mm to 26.64 ± 2.29 mm (P < 0.001), lower medial palpebral fissure area from 7.10 ± 3.97 mm2 to 10.37 ± 3.40 mm2 (P < 0.001), and LCA from 20.28 ± 4.79 mm2 to 21.25 ± 5.14 mm2 (P = 0.008). Multivariate linear regression analysis revealed that changes in the MRD2 (P = 0.019) and LCA (P = 0.048) were associated with enophthalmos improvement.

Conclusion:

The central and medial portions of the lower eyelid are retracted after inferior orbital reconstruction in patients with blowout fractures. The amount of central retraction on the lower eyelid is associated with the amount of enophthalmos improvement.
Hostile Scalp Wound Reconstruction Using Acellular Dermal Matrix for Soft Tissue Augmentation
Authors: Aronson Sofia , Ellis Marco F.
Published: February 2020

The use of acellular dermal matrix (ADM) is well established in scalp burn reconstruction. However, its application in at-risk patients and hostile scalp wounds remains controversial and only described in the pediatric setting.1,2 This study aims to describe the pre-operative factors leading to the decision to use ADM in adult patients undergoing complex scalp reconstruction, and to describe the postoperative outcomes including wound breakdown and need for reoperation. This is a retrospective case series of patients undergoing scalp reconstruction with use of ADM. Data was collected from operations performed by a single surgeon over a period from January 2017 to October 2018. Nine patients underwent scalp reconstruction including placement of ADM during the study period. Seven patients were female, and median age was 64 years. Six patients had undergone prior craniotomies and three had undergone prior craniectomies for a variety of etiologies including neoplastic disease (n = 4), aneurysmal disease (n = 2), and trauma (n = 3). Wound breakdown or delayed wound healing necessitated reconstructive operations in all patients, 4 of whom had exposed/infected hardware that required removal. The median area of soft tissue defects was 30 cm2. Two of the 4 patients with both benign and malignant tumors had been treated with radiation therapy, compromising the quality of the remaining adjacent scalp. Acellular dermal matrix was used in each setting to augment or buttress thin scalp. In 4 patients cranioplasty implants, hardware, or mesh were replaced concurrently. Two patients proceeded onto staged alloplastic cranioplasty without complication. Median follow up was 115 days. During follow up, only 1 patient suffered a major complication requiring reoperation to explant an osteomyelitic bone flap. Acellular dermal matrix can serve as an adjunct in hostile scalp reconstruction. Augmenting the areas of compromised scalp, especially over alloplastic cranioplasty material, can minimize the likelihood of future hardware exposure. Our study demonstrates its use in high-risk scalp wounds defined by frequent operation, chronic infection, and radiation.
Free Orbital Fat Grafting During Upper Blepharoplasty in Asians to Prevent Multiple Upper Eyelid Folds and Sunken Upper Eyelids
Authors: Jiang Liya , Li Haidong , Yin Ningbei , Wang Yongqian , Song Tao , Wu Di
Published: February 2020

Background:

Nowadays, a sharp, well-defined supratarsal fold and appropriate fullness of the upper eyelid tissue are considered important features of beautiful and youthful eyes. Individuals with thin upper eyelid tissue are at high risk of developing multiple upper eyelid folds and/or sunken appearance after upper blepharoplasty. Innovatively, the authors propose the application of free orbital fat grafting to the postorbicularis oculi space during upper blepharoplasty in order to achieve better aesthetic results.

Methods:

Fifty Chinese patients with congenital single eyelids combined with mildly sunken upper eyelid tissue were operated on between June 2017 and October 2018. During blepharoplasty, the lateral portion of the orbital septum was dissected, and appropriate lateral orbital fat was harvested. When the double-eyelid fold was formed and skin was interruptedly sutured, the harvested fat was divided into several pieces each side according to the sunken depth, and they were used to replace a layer on two-thirds of the central region of the supraseptal skin-muscle flap through the zipping gaps.

Results:

Forty-five patients underwent the follow-up interview for 6 to 18 months with a mean period of 10 months. The satisfaction rate was 82%. No significant asymmetry, irregularities, and sunken upper eyelid and multiple upper eyelid folds occurred.

Conclusion:

The lateral orbital fat grafting to the central region of the supraseptal skin-muscle flap during upper blepharoplasty is an effective and simple method to correct or prevent multiple upper eyelid folds and/or sunken upper eyelid in Asians.
Psychophysiological Stress Indicators of Heart Rate Variability and Electrodermal Activity With Application in Healthcare Simulation Research
Authors: Bhoja Ravi , Guttman Oren T. , Fox Amanda A. , Melikman Emily , Kosemund Matthew , Gingrich Kevin J.
Published: February 2020

Summary Statement

Psychological stress arises from a stressor placed on an individual that leads to both emotional and physiological responses. The latter is referred to as psychophysiological stress. Healthcare simulation provides a platform to investigate stress psychobiology and its effects on learning and performance. However, psychophysiological stress measures may be underused in healthcare simulation research. The inclusion of such measures with subjective measures of stress in healthcare simulation research provides a more complete picture of the stress response, thereby furthering the understanding of stress and its impact on learning and performance. The goals of this article were to review 2 commonly used psychophysiological stress measures involving heart rate variability and electrodermal activity reflecting sweat gland activity and to demonstrate their utility in an example pilot study in healthcare simulation research.
A Clinical Trial With Adoptive Transfer of Ex Vivo-induced, Donor-specific Immune-regulatory Cells in Kidney Transplantation—A Second Report
Authors: Koyama Ichiro , Bashuda Hisashi , Uchida Koichiro , Seino Ken-ichiro , Habu Sonoko , Nakajima Ichiro , Fuchinoue Shohei , Okumura Ko , Teraoka Satoshi
Published: February 2020

Background.

Although the outcome of kidney transplantation (KTx) has improved, various adverse effects of immunosuppressants and chronic rejection aggravate the long-term prognosis of patients. Therefore, the induction of immune tolerance may be an effective therapeutic strategy.

Methods.

A clinical trial aiming at immune tolerance induction was conducted in kidney transplant recipients from HLA mismatched living donors by infusing autologous donor-specific regulatory T cells (Treg). To obtain Treg, recipient’s peripheral blood mononuclear cells were cocultured with irradiated donor cells in the presence of anti-CD80/CD86 monoclonal antibody for 2 weeks. For preconditioning, splenectomy + cyclophosphamide (CP) was employed in the first series (group A; n = 9). In group B, splenectomy was substituted by preadministration of rituximab (group B; n = 3). In the latest cases, rituximab + rabbit antithymocyte globulin was administered instead of cyclophosphamide (group C; n = 4). Twelve days after KTx, the cultured cells were intravenously infused, and immunosuppressants were gradually tapered thereafter.

Results.

Although mixed lymphocyte reaction was remarkably suppressed in a donor-specific fashion, 6 out of 9 patients from group A, 1 out of 3 from group B, and 1 out of 4 from group C developed acute rejection within 1 year after KTx. Complete cessation of immunosuppression was not achieved, and a small dose of immunosuppressants was continued.

Conclusions.

The adoptive transfer of autologous ex vivo-expanded Treg is 1 of the options to possibly induce alloimmune hyporesponsiveness. However, in the present study, further regimen optimization is still required and should be the focus of future investigations.
Agmatine Attenuates Liver Ischemia Reperfusion Injury by Activating Wnt/β-catenin Signaling in Mice
Authors: Han Zhenyi , Li Yakun , Yang Bo , Tan Rumeng , Wang Meixi , Zhang Bo , Dai Chen , Wei Lai , Chen Dong , Chen Zhishui
Published: February 2020

Background.

Liver ischemia reperfusion injury (LIRI) is a common problem during surgical procedures of the liver. It causes severe inflammatory responses and cell death, eventually leading to serious liver damage. Agmatine (AGM) is an endogenous polyamine with analgesic, anti-inflammatory, and antiapoptotic effects. However, it is still unknown whether AGM can protect the liver from damage caused by LIRI.

Methods.

For the in vivo experiments, a mouse model of partial warm hepatic ischemia reperfusion was established using C57BL/6J mice and then serum transaminase concentrations were analyzed. Histopathology was used to evaluate the degree of liver injury and quantitative real-time PCR was used to measure the amount of inflammatory cytokines. For the in vitro experiments, a cellular model of cobalt chloride (CoCl2)-induced hypoxia was established using AML12 cells. Flow cytometry was performed to measure the apoptosis levels. Western blotting analysis was conducted to measure the levels of proteins involved in apoptosis and Wnt/β-catenin signaling. We also chose 2 inhibitors of the Wnt/β-catenin signaling to elucidate the relationship between AGM and the Wnt/β-catenin signaling.

Results.

AGM showed protective effects against LIRI-induced liver damage, inflammatory responses, and cell apoptosis along with alleviation of CoCl2-induced hepatocyte injury. AGM activated the Wnt/β-catenin signaling pathway during LIRI and CoCl2-induced hepatocyte injury; however, when the Wnt/β-catenin pathway was inhibited, the protective effects of AGM declined.

Conclusions.

AGM showed protective effects against LIRI by activating the Wnt/β-catenin signaling pathway.
Restricted Diffusion in the Optic Nerve Head After Shock-Induced Anterior Ischemic Optic Neuropathy
Authors: Al Othman Bayan A. , Naser Maryam , Kini Ashwini T. , Lee Andrew G.
Published: February 2020

Shock-induced anterior ischemic optic neuropathy (SIAION) is a known type of optic neuropathy in patients who experienced shock related to different etiologies such as anemia and severe intradialytic hypotension like in our patient. Nonarteritic anterior ischemic optic neuropathy (NAION) is the most common acute unilateral known type of optic neuropathy in older patients with vasculopathic risk factors such as hypertension, diabetes mellitus, and obstructive sleep apnea. Although SIAION and NAION are similar optic neuropathies due to ischemia and, in particular, hypotension, they may have different pathogenic mechanisms (e.g., acute shock or intradialytic hypotension vs nocturnal hypotension), laterality (e.g., unilateral vs bilateral), and severity (e.g., light perception or worse vision). We presented a case with restricted diffusion on the apparent diffusion coefficient and the diffusion weighted imaging confined to the optic disc head in a patient with pallid edema after intradialytic hypotension. Although DWI of the optic nerve is neither 100% specific nor 100% sensitive for ischemia, we believe that restricted diffusion of the optic nerve head in our case is a clinico-radiologic correlate to pallid edema in SIAION.
Episodic Visual Distortions and Stroke-Like Symptoms in a 56-Year-Old Man With Intravascular Lymphoma
Authors: Chwalisz Bart K. , Douglas Vivian P. , Douglas Konstantinos A. A. , Martinez-Lage Maria , Kelly Hilary R. , Cestari Dean M.
Published: February 2020

A healthy 56-year-old man presented with vision changes and left upper extremity motor and sensory changes. MRI of the brain without contrast was significant for multifocal areas of restricted diffusion in multiple vascular territories. Neuro-Ophthalmic evaluation revealed an inferonasal visual field defect in the left eye, thickened choroid on optical coherence tomography, and bilateral delayed arteriovenous and choroidal filling on fluorescein angiogram. Repeat MRI demonstrated interval enlargement of many of the same foci of abnormal diffusion-weighted imaging signal. Computed tomography of the abdomen and pelvis revealed 3 distinct lobulated retroperitoneal masses that were biopsied and found to be consistent with diffuse large B-cell lymphoma. Brain biopsy specimens showed intravascular lymphocytes, confirming a diagnosis of intravascular lymphoma (IVL). In this diagnostically challenging case, a link was established between the presence of multiple strokes (some of which showed slow evolution over time) and retinochoroidal hypoperfusion, which provided a critical clue to the ultimate diagnosis of IVL.
Localizing Thalamomesencephalic Afferent and Efferent Pupillary Defects
Authors: Sharifi Ardalan , Sigireddi Rohini R. , Lyons Lance J. , Kini Ashwini T. , Al Othman Bayan A. , Lee Andrew G.
Published: February 2020

A 42-year-old Algerian man presented for binocular oblique diplopia, hypersomnolence with drop attacks, bilateral hearing loss, and thoracic pain. He had a right thalamomesencephalic hemorrhage due to an underlying cavernous malformation treated with subtotal surgical resection. On neuro-ophthalmic examination, the patient had a left relative afferent pupillary defect and a right oculosympathetic efferent pupillary defect (i.e., Horner syndrome) in addition to other thalamomesencephalic eye and neurologic signs (right fourth nerve palsy, hearing loss, hemiparesis, and thalamic pain). Clinicians should recognize the localizing value of this unique constellation of mesencephalic afferent and efferent pupillary defects.
Impairments of Implicit Emotional Neurocognitive Processing in College Students With Subthreshold Depression: An ERP Study
Authors: Zhang Jinpeng , Li Xue , Du Jian , Tan Xi , Zhang Jing , Zhang Yichunzi , You Mingyan , Zhao Mingyang , Gao Yue , Wang Junyan , Pan Chang , Kong Junhui
Published: February 2020

Purpose:

Previous studies have proved that the people with subthreshold depression (SD) had negative cognitive bias in conscious level. However, it still remains a point of controversy whether they have impairment in unconscious level. The present study aimed to explore whether the implicit emotional processing differed between people with SD and healthy controls (HCs) and the details by analyzing the event-related potentials.

Methods

We recruited 35 SD participants and 35 age- and sex-matched HCs to collect event-related potential data. A visual oddball task was used to investigate implicit emotional processing with three types of emotional pictures (positive, negative, and neutral as stimuli). The N2 and P3 components were used to compare the neurocognitive differences of implicit emotional processing between two groups.

Results:

Compared with the HC group, the SD participants showed no significant differences in the amplitudes or latencies of the N2 component for any kind of emotional stimuli but smaller P3 amplitudes for all kinds of emotional stimuli. The P3 latencies for positive stimuli were slower than the negative ones in the SD group but not in the HC group. The SD group showed slower P3 latencies than the HC group only for positive stimuli. There was a positive correlation between Center for Epidemiological Survey, Depression Scale score and average N2 and P3 amplitudes.

Conclusions:

The SD people demonstrate implicit cognitive processing impairments, and the impairments of emotional cognitive processing in SD may exist mainly in evaluative stage and primarily for positive stimuli.
A protocol for a pilot randomized controlled trial of guided self-help Behavioral Activation intervention for geriatric depression
Authors: Wang Xiaoxia , Zhou Xiaoyan , Yang Hui
Published: February 2020

Background

Aging is a social concern. Despite increased incidence of depression in Chinese older populations, they are often misdiagnosed and undertreated, which pose a challenge to our health care system. Depressed older adults often suffer from lack of motivation. Evidence-based guided self-help behavioral activation treatment is effective in reducing anhedonia and amotivation symptoms, however the efficacy in in elderly depressed patients are unknown yet. So the current study aim to pilot the self-help guided intervention for the treatment of depression in elderly patients.

Methods/design

A pilot randomized controlled trial with 30 elderly inpatients with major depressive disorder will be conducted. Participants attending clinical psychological clinics at Mental Health Center of Chongqing will be randomized to receive guided self-help BA intervention or to a 6-week waiting list control. Participants in the treatment group will receive 6 sessions of guided self-help BA intervention delivered over the telephone. The waiting list control group will receive the intervention after a waiting period of 6 weeks. Exclusion criteria are limited to those at significant risk of harm to self or others, the presence of primary mental health disorder other than depression or intellectual disability at a level meaning potential participants would be unable to access the intervention. The study has ethical approval from the Chinese Research Ethics Committee. Our hypothesis is that guided self-help BA will effective when compared with the waiting-list intervention.

Results

Effects of the treatment were observed on three outcomes domains: (1) clinical outcomes (symptom severity, recovery rates); (2) process variables (patient satisfaction, attendance, dropout); and (3) economic outcomes (cost and resource use). We also examine mediators of outcomes in terms of patient variables (behavioral activation/inhibition motivation). Results will be disseminated to patients, the wider public, clinicians and researchers through publication in journals and presentation at conferences.

Discussion

This is the first study to investigate guided self-help interventions for China geriatric depressed patients, a group which is currently under-represented in mental health research. The intervention is modular and adapted from an empirically supported behavioral activation treatment for depression (BATD). The generalizability and broad inclusion criteria are strengths but may also lead to some weaknesses.
TG-Interacting Factor 1 expression quantitatively impacts survival in acute myeloid leukemia
Authors: Yan Ling , Means-Powell Julie A. , Martincic Danko , Kravtsov Vladimir D. , Shyr Yu , Greer John P. , Davé Utpal P. , Koury Mark J. , Wotton David , Hamid Rizwan , Brandt Stephen J.
Published: February 2020

Applying transcriptional profiling analysis to myeloblasts from 59 adult patients with acute myeloid leukemia (AML) treated at our institution, we found that expression of the three-amino acid loop extension (TALE) homeobox gene TG-Interacting Factor 1 (TGIF1) correlated with overall and relapse-free survival, which was then confirmed in two other cohorts of patients.

Moreover, TGIF1 expression correlated with survival for all cytogenetic risk groups and was an independent prognostic factor in multivariate analysis. To elucidate the mechanism, we used Tgif1 knockout mice in which acute or chronic myeloid leukemia was induced through retroviral transfer of the MLL-AF9 or BCR-ABL fusion genes into bone marrow cells. Loss of Tgif1 accelerated disease progression, shortened survival, attenuated the response to chemotherapy, and doubled the frequency of leukemia-initiating cells. RNA-based sequencing analysis showed that genes associated with transforming growth factor-β (TGF-β) and retinoic acid signaling pathways were differentially affected in Tgif1-/- compared to Tgif1+/+ leukemia cells.
Doubling Time of the COVID-19 Epidemic by Chinese Province
Authors: Muniz-Rodriguez Kamalich , Chowell Gerardo , Cheung Chi-Hin , Jia Dongyu , Lai Po-Ying , Lee Yiseul , Liu Manyun , Ofori Sylvia K. , Roosa Kimberlyn M. , Simonsen Lone , Viboud Cecile , Fung Isaac Chun-Hai
Published: February 2020

COVID-19 epidemic doubling time by Chinese province was increasing from January 20 through February 9, 2020. The harmonic mean of the arithmetic mean doubling time estimates ranged from 1.4 (Hunan, 95% CI, 1.2-2.0) to 3.1 (Xinjiang, 95% CI, 2.1-4.8), with an estimate of 2.5 days (95% CI, 2.4-2.6) for Hubei.
When to depart from a stopover site? Time since arrival matters more than current weather conditions
Authors: Roques Sébastien , Henry Pierre-Yves , Guyot Gaétan , Bargain Bruno , Cam Emmanuelle , Pradel Roger
Published: February 2020

On the journey to wintering sites, migratory birds usually alternate between flights and stopovers where they rest and refuel. Migration strategies are assumed to differ according to season: a time-minimization pre-breeding migration strategy towards breeding locations, and an energy-minimization post-breeding migration strategy to wintering ones. The duration of flights and stopovers determines the energy requirements and the total duration of the journey. Since migrating birds actually spend most of the time at stopovers, selection to minimize the amount of energy or time spent on migration is very likely to operate on the effectiveness of stopover rest and refueling. Here we address the relative contribution of factors to departure decisions from stopover sites during the post-breeding migration in a long-distance migratory songbird. When capture probability is low it is impossible to assess the variation in body condition over the entire duration of the stopover. To get around this, we use Time Since Arrival (TSA) as a proxy for the changes in the state of individuals during the stopover. We propose that TSA is an integrative proxy for resting, feeding and fattening efficiency. We develop a capture-recapture model to address the relationship between departure probability, estimated TSA, and weather conditions. Using a 20-year dataset from sedge warblers, we show that TSA has a larger effect on departure probability than weather conditions. Low humidity and an increase in atmospheric pressure in the days preceding departure are associated with higher departure probability, but these effects are smaller than that of TSA.
Light-driven ATP production promotes mRNA biosynthesis inside hybrid multi-compartment artificial protocells
Authors: Altamura Emiliano , Albanese Paola , Marotta Roberto , Milano Francesco , Fiore Michele , Trotta Massimo , Stano Pasquale , Mavelli Fabio
Published: February 2020

The construction of energetically autonomous artificial protocells is one of the most urgent and challenging requirements in bottom-up synthetic biology. Here we show a hybrid multi-compartment approach to build Artificial Simplified-Autotroph Protocells (ASAPs) in an effective manner. Chromatophores obtained fromRhodobacter sphaeroidesaccomplish the photophosphorylation of ADP to ATP functioning as nanosized photosynthetic organellae when encapsulated inside artificial giant phospholipid vesicles. Under continuous illumination chromatophores produce ATP that in turn sustains the transcription of a DNA gene by T7 RNA polymerase inside ASAPs. Cryo-EM and time-resolved spectroscopy were used for characterizing the chromatophore morphology and the orientation of the photophosphorylation proteins, which allow high ATP production rates (up to ~100 ATP/s per ATP synthase). mRNA biosynthesis inside individual vesicles has been determined by confocal microscopy. The hybrid multi-compartment approach here proposed appears at the same time convenient and effective, and thus very promising for the construction of full-fledged artificial protocells.
A robust and interpretable, end-to-end deep learning model for cytometry data
Authors: Hu Zicheng , Tang Alice , Singh Jaiveer , Bhattacharya Sanchita , Butte Atul J.
Published: February 2020

Cytometry technologies are essential tools for immunology research, providing high-throughput measurements of the immune cells at the single-cell level. Traditional approaches in interpreting and using cytometry measurements include manual or automated gating to identify cell subsets from the cytometry data, providing highly intuitive results but may lead to significant information loss, in that additional details in measured or correlated cell signals might be missed. In this study, we propose and test a deep convolutional neural network for analyzing cytometry data in an end-to-end fashion, allowing a direct association between raw cytometry data and the clinical outcome of interest. Using nine large CyTOF studies from the open-access ImmPort database, we demonstrated that the deep convolutional neural network model can accurately diagnose the latent cytomegalovirus (CMV) in healthy individuals, even when using highly heterogeneous data from different studies. In addition, we developed a permutation-based method for interpreting the deep convolutional neural network model and identified a CD27-CD94+ CD8+ T cell population significantly associated with latent CMV infection. Finally, we provide a tutorial for creating, training and interpreting the tailored deep learning model for cytometry data using Keras and TensorFlow (github.com/hzc363/DeepLearningCyTOF).
The Potassium Channel Subunit Kvβ1 is Required for Synaptic Facilitation
Authors: Cho In Ha , Panzera Lauren C. , Chin Morven , Alpizar Scott A. , Hoppa Michael B.
Published: February 2020

Analysis of the presynaptic action potential’s (APsyn) role in synaptic facilitation in hippocampal pyramidal neurons has been difficult due to size limitations of axons. We overcame these size barriers by combining high resolution optical recordings of membrane potential, exocytosis and Ca2+in cultured hippocampal neurons. These recordings revealed a critical and selective role for Kv1 channel inactivation in synaptic facilitation of excitatory hippocampal neurons. Presynaptic Kv1 channel inactivation was mediated by the Kvβ1 subunit, and had a surprisingly rapid onset that was readily apparent even in brief physiological stimulation paradigms including paired-pulse stimulation. Genetic depletion of Kvβ1 blocked all broadening of the APsynduring high frequency stimulation and eliminated synaptic facilitation without altering the initial probability of vesicle release. Thus using all quantitative optical measurements of presynaptic physiology, we reveal a critical role for presynaptic Kvchannels in synaptic facilitation at small presynaptic terminals of the hippocampal neurons upstream of exocytic machinery.

Significance

Nerve terminals generally engage in two opposite and essential forms of synaptic plasticity (facilitation or depression) during high frequency stimulation that play critical roles in learning and memory. Measurements of the electrical impulses (action potentials) underlying these two forms of plasticity has been difficult in small nerve terminals due to their size. In this study we deployed a combination of optical measurements of vesicle fusion and membrane voltage to overcome this previous size barrier. Here, we found a unique molecular composition of Kv1 channel β-subunits that causes broadening of the presynaptic action essential to synaptic facilitation. Disruption of the Kvβ1 inactivation mechanism switches excitatory nerve terminals into a depressive state, without any disruption to initial probability of vesicle fusion.
P4HA2 is associated with prognosis, promotes proliferation, invasion, migration and EMT in glioma
Authors: Lin Jing , Wu Xiao-Jun , Wei Wen-Xin , Gao Xing-Chun , Jin Ming-Zhu , Cui Yong , Jin Wei-Lin , Qiu Guan-Zhong
Published: February 2020

Prolyl-4-hydroxylase subunit 2 (P4HA2), as a member of collagen modification enzymes, is induced under hypoxic conditions with essential roles in the collagen maturation, deposition as well as the remodeling of extracellular matrix(ECM). Mounting evidence has suggested that deregulation of P4HA2 is common in cancer. However, the expression pattern and molecular mechanisms of P4HA2 in glioma remain unknown. Here, we demonstrate that P4HA2 is overexpressed in glioma and inversely correlates with patient survival. Knockdown of P4HA2 inhibits proliferation, migration, invasion, and epithelial-to-mesenchymal transition (EMT)-like phenotype of glioma cellsin vitroand suppressed tumor xenograft growthin vivo. Mechanistically, bioinformatics analysis shows that ECM-receptor interaction and PI3K/AKT pathway are the most enriched pathways of the co-expressed genes with P4HA2. Furthermore, P4HA2 mRNA was positively correlated with mRNA expressions of a series of collagen genes, but not mRNA of PI3K or AKT1/2. Conversely, both the protein expressions of collagens and phosphorylated PI3K/AKT could be downregulated either by silencing of P4HA2 expression or inhibition of its prolyl hydroxylase. Moreover, the inhibitory effects on the migration, invasion and the EMT-related molecules by P4HA2 knockdown can be recapitulated by the Akt phosphorylation activator. Taken together, our findings for the first time reveal an oncogenic role of P4HA2 in the glioma malignancy. By regulating the expression of fibrillar collagens and the downstream PI3K/AKT signaling pathway, it may serve as a potential anti-cancer target for the treatment of glioma.

Highlights

P4HA2 is overexpressed and correlated with poor prognosis in glioma.

P4HA2 depletion inhibits glioma proliferation, migration, invasion and EMT-like phenotype in vitro and tumorigenesis in vivo.

P4HA2 depletion attenuates the PI3K/AKT signaling pathway in a collagen-dependent manner.
Measuring nucleus mechanics within a living multicellular organism: Physical decoupling and attenuated recovery rate are physiological protective mechanisms of the cell nucleus under high mechanical load
Authors: Zuela-Sopilniak Noam , Bar-Sela Daniel , Charar Chayki , Wintner Oren , Gruenbaum Yosef , Buxboim Amnon
Published: February 2020

Nuclei within cells are constantly subjected to compressive, tensile and shear forces, which regulate nucleoskeletal and cytoskeletal remodeling, activate signaling pathways and direct cell-fate decisions. Multiple rheological methods have been adapted for characterizing the response to applied forces of isolated nuclei and nuclei within intact cells. However,in vitromeasurements fail to capture the viscoelastic modulation of nuclear stress-strain relationships by the physiological tethering to the surrounding cytoskeleton, extracellular matrix and cells, and tissue-level architectures. Using an equiaxial stretching apparatus, we applied a step stress and measured nucleus deformation dynamics within livingC. elegansnematodes. Nuclei deformed non-monotonically under constant load. Non-monotonic deformation was conserved across tissues and robust to nucleoskeletal and cytoskeletal perturbations, but it required intact Linker of Nucleoskeleton and Cytoskeleton (LINC) complex attachments. The transition from creep to strain recovery fits a tensile-compressive linear viscoelastic model that is indicative of nucleoskeletal-cytoskeletal decoupling under high load. Ce-lamin (lmn-1) knockdown softened the nucleus whereas nematode ageing stiffened equilibrium elasticity and decreased deformation recovery rate. Recovery lasted minutes due to physiological damping of the released mechanical energy thus protecting nuclear integrity and preventing chromatin damage.
Unveiling Prognostics Biomarkers of Tyrosine Metabolism Reprogramming in Liver Cancer by Cross-platform Gene Expression Analyses
Authors: Nguyen Tran N , Le Duc-Hau , Nguyen Ha Quy
Published: February 2020

Tyrosine is mainly degraded in the liver by a series of enzymatic reactions. Abnormal expression of the tyrosine catabolic enzyme tyrosine aminotransferase (TAT) has been reported in patients with hepatocellular carcinoma (HCC). Despite this, aberration in tyrosine metabolism has not been investigated in cancer development. In this work, we conduct comprehensive cross-platform study to obtain foundation for discoveries of potential therapeutics and preventative biomarkers of HCC. We explore data from The Cancer Genome Atlas (TCGA), Gene Expression Omnibus (GEO), Gene Expression Profiling Interactive Analysis (GEPIA), Oncomine and Kaplan Meier plotter (KM plotter) and performed integrated analyses to evaluate the clinical significance and prognostic values of the tyrosine catabolic genes in HCC. We find that five tyrosine catabolic enzymes are downregulated in HCC compared to normal liver at mRNA and protein level. Moreover, low expression of these enzymes correlates with poorer survival in patients with HCC. Notably, we identify pathways and upstream regulators that might involve in tyrosine catabolic reprogramming and further drive HCC development. In total, our results underscore tyrosine metabolism alteration in HCC and lay foundation for incorporating these pathway components in therapeutics and preventative strategies.
Evaluation of the inhibitory effects of drugs on the growth ofBabesiaParasites using real-time PCR method
Authors: Zhai Xiao-hu , Feng Xiao-xiao , Wu Xian , He Wei-hua , Li Yan-yan , Yao Da-wei , Zhang Bin
Published: February 2020

In order to evaluate the inhibitory effects of drug on the growth ofbabesiaparasite, relative quantification real-time PCR method was developed in this study. The18S rRNAgene was used as target gene for the 2−ΔΔCtmethod analysis. Meanwhile, Chicken RNA was added into the parasitized blood for total RNA extraction. Theβ-actingene of chicken was selected as internal control gene for the 2−ΔΔCtmethod analysis. Parasitized blood 100 μL, 50 μL, 25μL, 12.5 μL, 6.25 μL was prepared forB. gibsonirelative quantification. Regression analysis results revealed that significant linear relationships between the relative quantification value and parasitemia. The18S rRNAgene expression was significantly decreased after the treatment of Diminazene aceturate and Artesunate in vitro drug sensitivity test. It suggested that this relative quantification real-time PCR method can be used in evaluating the effects of inhibitory of drug.
Effects of Gold Nanoparticles on the Stepping Trajectories of Kinesin
Authors: Hasnain Sabeeha , Mugnai Mauro Lorenzo , Thirumalai Dave
Published: February 2020

Substantial increase in the temporal resolution of the stepping of dimeric molec- ular motors is possible by tracking the position of a large gold nanoparticle (GNP) attached to a labeled site on one of the heads. This technique was used to measure the stepping trajectories of conventional kinesin (Kin1) using the time dependent position of the GNP as a proxy. The trajectories revealed that the detached head always passes to the right of the head that is tightly bound to the microtubule (MT) during a step. In interpreting the results of such experiments, it is implicitly assumed that the GNP does not significantly alter the diffusive motion of the detached head. We used coarse-grained simulations of a system consisting of the MT-Kin1 complex with and without attached GNP to investigate how the stepping trajectories are affected. The two significant findings are: (1) The GNP does not faithfully track the position of the stepping head. (2) The rightward bias is typically exaggerated by the GNP. Both these findings depend on the precise residue position to which the GNP is attached. Surprisingly, we predict that the stepping trajectories of kinesin are not significantly affected if, in addition to the GNP, a 1 μm diameter cargo is attached to the coiled coil. Our simulations suggest the effects of the large probe have to be considered when inferring the stepping mechanisms using GNP tracking experiments.