bluuebunny/crossref_metadata_2025_split huggingface dataset:
Response to thermal and infection stresses in an American vector of visceral leishmaniasis
Authors: Martins Kelsilandia A. , Morais Caroline S. , Broughton Susan J. , Lazzari Claudio R. , Bates Paul A. , Pereira Marcos H. , Dillon Rod J. 
Published: November 2020

AbstractThe phlebotomine sand flyLutzomyia longipalpisis the primary insect vector of visceral leishmaniasis in the Americas. For ectothermic organisms such as sand flies, the ambient temperature is a critical factor influencing all aspects of their life. However, the impact of temperature has been ignored in previous investigations of stress-induced responses by the vector, such as taking a blood meal or duringLeishmaniainfection. Therefore, this study explored the interaction ofLu. longipalpiswith temperature by evaluating sand fly behaviour across a thermal gradient after sugar or blood-feeding, and infection withLeishmania mexicana.Thermographic recordings of sand fly females fed on mice were analysed, and the gene expression of heat shock proteins HSP70 and HSP90(83) was evaluated when insects were exposed to extreme temperatures or infected. The results showed that 72h after blood ingestion females ofLu. longipalpisbecame less active and preferred relatively low temperatures. However, at later stages of blood digestion females increased their activity and remained at higher temperatures prior to taking a second blood meal; this behaviour seems to be correlated with the evolution of their oocysts and voracity for a second blood meal. No changes in the temperature preferences of female sand flies were recorded in the presence of a gut infection byLe. mexicana,indicating that this parasite has not triggered behavioural immunity inLu. longipalpis. Real-time imaging showed that the body temperature of female flies feeding on mice increased to the same temperature as the host within a few seconds after landing. The body temperature of females remained around 35 ± 0.5 °C until the end of blood-feeding, revealing a lack of thermoregulatory behaviour. Analysis of expression of heat shock proteins revealed insects increased expression of HSP90(83) when exposed to higher temperatures, such as during blood feeding. Our findings suggest thatLu. longipalpisinteracts with the environmental temperature by using its behaviour to avoid temperature-related physiological damage during the gonotrophic cycle. However, the expression of certain heat shock proteins might be triggered to mitigate against thermal stress in situations where a behavioural response is not the best option.
Assessing the reliability of an automated method for measuring dominance hierarchy in nonhuman primates
Authors: Ballesta Sébastien , Sadoughi Baptiste , Miss Fabia , Whitehouse Jamie , Aguenounon Géraud , Meunier Hélène 
Published: November 2020

AbstractAmong animals’ societies, dominance is an important social factor that influences inter-individual relationships. However, assessing dominance hierarchy can be a time-consuming activity which is potentially impeded by environmental factors, difficulties in the recognition of animals, or through the disturbance of animals during data collection. Here we took advantage of novel devices, Machines for Automated Learning and Testing (MALT), designed primarily to study nonhuman primates’ cognition - to additionally measure the social structure of a primate group. When working on a MALT, an animal can be replaced by another; which could reflect an asymmetric dominance relationship (or could happen by chance). To assess the reliability of our automated method, we analysed a sample of the automated conflicts with video scoring and found that 75% of these replacements include genuine forms of social displacements. We thus first designed a data filtering procedure to exclude events that should not be taken into account when automatically assessing social hierarchies in monkeys. Then, we analysed months of daily use of MALT by 25 semi-free ranging Tonkean macaques (Macaca tonkeana) and found that dominance relationships inferred from these interactions strongly correlate with the ones derived from observations of spontaneous agonistic interactions collected during the same time period. We demonstrate that this method can be used to assess the evolution of individual social status, as well as group-wide hierarchical stability longitudinally with minimal research labour. Further, it facilitates a continuous assessment of dominance hierarchies, even during unpredictable environmental or challenging social events. Altogether, this study supports the use of MALT as a reliable tool to automatically and dynamically assess social status within groups of nonhuman primates, including juveniles.
Local brassinosteroid biosynthesis enables optimal root growth
Authors: Vukašinović Nemanja , Wang Yaowei , Vanhoutte Isabelle , Fendrych Matyáš , Guo Boyu , Kvasnica Miroslav , Jiroutová Petra , Oklestkova Jana , Strnad Miroslav , Russinova Eugenia 
Published: November 2020

AbstractBrassinosteroid hormones are indispensable for root growth and they control both cell division and cell elongation through the establishment of an increasing signaling gradient along the longitudinal root axis. Because of their limited mobility, the importance of brassinosteroid distribution for achieving the signaling maximum is largely overlooked. Expression pattern analysis of all known brassinosteroid biosynthetic enzymes revealed that not all cells in theArabidopsis thalianaroot possess full biosynthetic machinery and completion of biosynthesis relies on cell-to-cell movement of the hormone precursors. We demonstrate that brassinosteroid biosynthesis is largely restricted to the root elongation zone where it overlaps with brassinosteroid signaling maxima. Moreover, optimal root growth requires hormone concentrations, low in the meristem and high in the root elongation zone attributable to an increased biosynthesis. Our finding that spatiotemporal regulation of hormone synthesis results in a local hormone accumulation provides a paradigm for hormone-driven organ growth in the absence of long-distance hormone transport in plants.
Building a virtual summer research experience in cancer for high school and early undergraduate students: lessons from the COVID-19 pandemic
Authors: Corson Timothy W , Hawkins Shannon M , Sanders Elmer , Byram Jessica , Cruz Leigh-Ann , Olson Jacob , Speidell Emily , Schnabel Rose , Balaji Adhitya , Ogbeide Osas , Dinh Julie , Hinshaw Amy , Cummings Laura , Bonds Vicki , Nakshatri Harikrishna 
Published: November 2020

AbstractBackgroundThe COVID-19 pandemic posed a unique challenge for summer research programs in 2020, particularly for programs aimed at hands-on experience for younger trainees. The Indiana University Melvin and Bren Simon Comprehensive Cancer Center supports two pipeline programs, which traditionally immerse high school juniors, seniors, and early undergraduate students from underrepresented populations in science in hands-on projects in cancer biology labs. However, due to social distancing policies during the pandemic and reduction of research operations, these students were not physically allowed on campus. Thus, the authors set out to strategically pivot to a wholly virtual curriculum and evaluate the Virtual Summer Research Experience in Cancer outcomes.MethodsThe virtual program included four components: 1. a core science and professional development curriculum led by high school teachers and senior undergraduates; 2. faculty-delivered didactic sessions on cancer science; 3. mentored, virtual research projects with research faculty; and 4. online networking events to encourage vertical mentoring. Outcomes data were measured using an 11-item Research Preparation scale, daily electronic feedback, and structured evaluation and feedback via Zoom weekly.ResultsOutcome data suggested high self-reported satisfaction with the virtual program. Outcome data also revealed the importance of coordination between multiple entities for seamless program implementation. This includes the active recruitment and participation of high school teachers and further investment in information technology capabilities of institutions.ConclusionsFindings reveal a path to educate and train high school and early undergraduate students in cancer research when hands-on, in-person training is not feasible. Virtual research experiences are not only useful to engage students during public health crises but can provide an avenue for cancer centers to expand their cancer education footprints to remotely located schools and universities with limited resources to provide such experiences to their students.
A novel, ataxic mouse model of Ataxia Telangiectasia caused by a clinically relevant nonsense mutation
Authors: Perez Harvey , Abdallah May F. , Chavira Jose I. , Norris Angelina S. , Egeland Martin T. , Vo Karen L. , Buechsenschuetz Callan L. , Sanghez Valentina , Kim Jeannie L. , Pind Molly , Nakamura Kotoka , Hicks Geoffrey G. , Gatti Richard A. , Madrenas Joaquin , Iacovino Michelina , McKinnon Peter J. , Mathews Paul J. 
Published: November 2020

AbstractAtaxia Telangiectasia (A-T) and Ataxia with Ocular Apraxia Type 1 (AOA1) are devastating neurological disorders caused by null mutations in the genome stability genes, A-T mutated (ATM) and Aprataxin (APTX), respectively. Our mechanistic understanding and therapeutic repertoire for treating these disorders is severely lacking, in large part due to the failure of prior animal models with similar null mutations to recapitulate the characteristic loss of motor coordination (i.e., ataxia) and associated cerebellar defects. By increasing genotoxic stress through the insertion of null mutations in both theAtm(nonsense) andAptx(knockout) genes in the same animal, we have generated a novel mouse model that for the first time develops a progressively severe ataxic phenotype associated with atrophy of the cerebellar molecular layer. We find biophysical properties of cerebellar Purkinje neurons are significantly perturbed (e.g., reduced membrane capacitance, lower action potential thresholds, etc.), while properties of synaptic inputs remain largely unchanged. These perturbations significantly alter Purkinje neuron neural activity, including a progressive reduction in spontaneous action potential firing frequency that correlates with both cerebellar atrophy and ataxia over the animal’s first year of life. Double mutant mice also exhibit a high predisposition to developing cancer (thymomas) and immune abnormalities (impaired early thymocyte development and T-cell maturation), symptoms characteristic of A-T. Lastly, by inserting a clinically relevant nonsense-type null mutation inAtm, we demonstrate thatSmallMoleculeRead-Through (SMRT) compounds can restore ATM production, indicating their potential as a future A-T therapeutic.
Delineating the heterogeneity of matrix-directed differentiation towards soft and stiff tissue lineages via single-cell profiling
Authors: Brielle Shlomi , Bavli Danny , Motzik Alex , Kan-Tor Yoav , Avni Batia , Ram Oren , Buxboim Amnon 
Published: November 2020

SummaryMesenchymal stromal/stem cells (MSCs) are a heterogeneous population of multipotent progenitors that contribute to tissue regeneration and homeostasis. MSCs assess extracellular elasticity by probing resistance to applied forces via adhesion, cytoskeletal, and nuclear mechanotransducers, that direct differentiation toward soft or stiff tissue lineages. Even under controlled conditions, MSC differentiation exhibits substantial cell-to-cell variation that remains poorly characterized. By single-cell transcriptional profiling of naïve, matrix-conditioned, and early differentiation state cells, we identified distinct MSC subpopulations with distinct mechanosensitivities, differentiation capacities, and cell cycling. We showed that soft matrices support adipogenesis of multipotent cells and endochondral ossification of non-adipogenic cells, whereas intramembranous ossification and pre-osteoblast proliferation are enhanced by stiff matrices. Using diffusion pseudotime mapping, we delineated hierarchical matrix-directed differentiation and identified mechanoresponsive genes. We found that tropomyosin-1 (TPM1) is highly sensitive to stiffness cues both at RNA and protein levels and that changes in expression of TPM1 determine adipogenic or osteogenic fates. Thus, cell-to-cell variation in tropomyosin-mediated matrix-sensing contributes to impaired differentiation with implications to the biomedical potential of MSCs.
Publishing of COVID-19 Preprints in Peer-reviewed Journals, Preprinting Trends, Public Discussion and Quality Issues
Authors: Kodvanj Ivan , Homolak Jan , Virag Davor , Trkulja Vladimir 
Published: November 2020

ABSTRACTIntroductionCOVID-19-related (vs. non-related) articles appear to be more expeditiously processed and published in peer-reviewed journals. We aimed to evaluate: (i) whether COVID-19-related preprints were favored for publication, (ii) preprinting trends and public discussion of the preprints, and (iii) the relationship between the publication topic (COVID-19-related or not) and quality issues.MethodsManuscripts deposited at bioRxiv and medRxiv between January 1 and September 27 were assessed for the probability of publishing in peer-reviewed journals, and those published were evaluated for submission-to-acceptance time. The extent of public discussion was assessed based on Altmetric and Disqus data. The Retraction Watch Database and PubMed were used to explore the retraction of COVID-19 and non-COVID-19 articles and preprints.ResultsWith adjustment for the preprinting server and number of deposited versions, COVID-19-related preprints were more likely to be published within 120 days since the deposition of the first version (OR=2.04, 95%CI 1.87-2.23) as well as over the entire observed period (OR=1.42, 95%CI 1.33-1.52). Submission-to-acceptance was by 38.67 days (95%CI 34.96-42.39) shorter for COVID-19 articles. Public discussion of preprints was modest and COVID-19 articles were overrepresented in the pool of retracted articles in 2020.ConclusionCurrent data suggest a preference for publication of COVID-19-related preprints over the observed period.
The impact of multifactorial stress combination on plant growth and survival
Authors: Zandalinas Sara I. , Sengupta Soham , Fritschi Felix B. , Azad Rajeev K. , Nechushtai Rachel , Mittler Ron 
Published: November 2020

SummaryClimate change-driven extreme weather events, combined with increasing temperatures, harsh soil conditions, low water availability and quality, and the introduction of many man-made pollutants, pose a unique challenge to plants. Although our knowledge of the response of plants to each of these individual conditions is vast, we know very little about how a combination of many of these factors, occurring simultaneously,i.e., multifactorial stress combination, impacts plants.Seedlings of wild type and different mutants ofArabidopsis thalianaplants were subjected to a multifactorial stress combination of six different stresses, each applied at a low level, and their survival, physiological and molecular responses determined.Our findings reveal that while each of the different stresses, applied individually, had a negligible effect on plant growth and survival, the accumulated impact of multifactorial stress combination on plants was detrimental. We further show that the response of plants to multifactorial stress combination is unique and that specific pathways and processes play a critical role in the acclimation of plants to multifactorial stress combination.Taken together our findings reveal that further polluting our environment could result in higher complexities of multifactorial stress combinations that in turn could drive a critical decline in plant growth and survival.Plain Language SummaryThe effects of multiple stress conditions occurring simultaneously,i.e., multifactorial stress combination, on plants is currently unknown. Here we show that different co-occurring stresses can interact to negatively impact plant growth and survival, even if the effect of each individual stress is negligible. We further identify several key pathways essential for plant acclimation to multifactorial stress combination.
Sex differences and similarities in the neuroimmune response to central administration of poly I:C
Authors: Posillico Caitlin K. , Garcia-Hernandez Rosa E. , Tronson Natalie C. 
Published: November 2020

ABSTRACTBackgroundThe neuroimmune system is required for normal neural processes, including modulation of cognition, emotion, and adaptive behaviors. Aberrant neuroimmune activation is associated with dysregulation of memory and emotion, though the precise mechanisms at play are complex and highly context dependent. Sex differences neuroimmune activation and function further complicate our understanding of its roles in cognitive and affective regulation.MethodsHere, we characterized the physiological sickness and inflammatory response of the hippocampus following intracerebroventricular (ICV) administration of a synthetic viral mimic, polyinosinic:polycytidylic acid (poly I:C), in both male and female C57Bl/6 mice.ResultsWe observed that poly I:C induced weight loss, fever, and elevations of cytokine and chemokines in the hippocampus of both sexes. Specifically, we found transient increases in gene expression and protein levels of IL-1α, IL-1β, IL-4, IL-6, TNFα, CCL2, and CXCL10, where males showed a greater magnitude of response compared with females. Only males showed increased IFNαand IFNγin response to poly I:C, whereas both males and females exhibited elevations of IFNβ, demonstrating a specific sex difference in the anti-viral response in the hippocampus.ConclusionOur data suggest that type I interferons are one potential node mediating sex-specific cytokine responses and neuroimmune effects on cognition. Together, these findings highlight the importance of using both males and females and analyzing a broad set of inflammatory markers in order to identify the precise, sex-specific roles for neuroimmune dysregulation in neurological diseases and disorders.
A Toll pathway effector protectsDrosophilaspecifically from distinct toxins secreted by a fungus or a bacterium
Authors: Huang Jianqiong , Lou Yanyan , Liu Jiyong , Bulet Philippe , Jiao Renjie , Hoffmann Jules A. , Liégeois Samuel , Li Zi , Ferrandon Dominique 
Published: November 2020

AbstractTheDrosophilasystemic immune response against many Gram-positive bacteria and fungi is mediated by the Toll pathway. How Toll-regulated effectors actually fulfill this role remains poorly understood as the known antimicrobial peptide (AMP) genes it controls are essentially active only against filamentous fungi and not against Gram-positive bacteria or yeasts.BaramicinAgene expression is transcriptionally regulated by the Toll pathway.BaraAencodes a polyprotein precursor that releases processed proteins into the hemolymph upon immune challenge. Here, we demonstrate thatBaraAis required specifically in the host defense againstEnterococcus faecalisand against the entomopathogenic fungusMetarhizium robertsii. It does so by protecting the fly from the action of distinct toxins secreted by Gram-positive and fungal pathogens but not by directly attacking them. Thus, in complement to the current paradigm, innate immunity can cope with toxins, effectively, through the secretion of peptides that are not AMPs, independently of xenobiotics detoxification pathways.
Structures of the Human LONP1 Protease Reveal Regulatory Steps Involved in Protease Activation
Authors: Shin Mia , Watson Edmond R. , Novick Scott J. , Griffin Patrick , Wiseman R. Luke , Lander Gabriel C. 
Published: November 2020

AbstractThe human mitochondrial AAA+ protein LONP1 is a critical quality control protease involved in regulating diverse aspects of mitochondrial biology including proteostasis, electron transport chain activity, and mitochondrial transcription. As such, genetic or aging-associated imbalances in LONP1 activity are implicated in the pathologic mitochondrial dysfunction associated with numerous human diseases. Despite this importance, the molecular basis for LONP1-dependent proteolytic activity remains poorly defined. Here, we solved cryo-electron microscopy structures of human LONP1 to reveal the molecular mechanism of substrate proteolysis. We show that, like bacterial Lon, human LONP1 adopts both an open and closed spiral staircase orientation dictated by the presence of substrate and nucleotide. However, unlike bacterial Lon, human LONP1 contains a second spiral staircase within its ATPase domain that engages substrate to increase interactions with the translocating peptide as it transits into the proteolytic chamber for proteolysis. Further, we show that substrate-bound LONP1 includes a second level of regulation at the proteolytic active site, wherein autoinhibition of the active site is only relieved by the presence of a peptide substrate. Ultimately, our results define a structural basis for human LONP1 proteolytic activation and activity, establishing a molecular framework to understand the critical importance of this protease for mitochondrial regulation in health and disease.
Gluttony as predictor of compulsive buying behaviour
Authors: Piper Luigi , Sestino Andrea , Guido Gianluigi 
Published: November 2020

PurposeThe main purpose of this research is to evaluate Gluttony's role in consumers' compulsive buying behaviour. Specifically, the authors want to identify the main psychological antecedents of the construct (expressed with the Big Five) and the moderating effects of shopping motives (in the two dimensions hedonism and utilitarianism).Design/methodology/approachThe hypotheses were tested by applying survey data from 335 participants to a mediation model with a moderator.FindingsThe results show that consciousness adversely affects gluttony, while neuroticism has a positive impact on it. Gluttony, in turn, mediates the relationship between these personality traits and compulsive buying behaviour. Finally, contrary to what might be expected, only utilitarianism accentuates the effect of gluttony on compulsive buying behaviour.Practical implicationsUsing these results, managers and policymakers can create more effective strategies for their commercial or awareness initiatives.Originality/valueThis study clarifies the role of gluttony in consumer behaviour by identifying the underlying personality traits.