In this task, you are given a passage which has a question and the context. You have to generate an answer to the question based on the information present in the context.

Ex Input:
Context: Exosomes are 30-100 nm membrane vesicles of endocytic origin, mediating diverse biological functions including tumor cell invasion, cell-cell communication and antigen presentation through transfer of proteins, mRNAs and microRNAs. Recent evidence suggests that microRNAs can be released through ceramide-dependent secretory machinery regulated by neutral sphingomyelinase 2 (nSMase2) enzyme encoded by the smpd3 gene that triggers exosome secretion. However, whether exosome-mediated microRNA transfer plays any role in cell invasion remains poorly understood. Thus, the aim of this study was to identify the exosomal microRNAs involved in breast cancer invasion.', 'The expression level of endogenous and exosomal miRNAs were examined by real time PCR and the expression level of target proteins were detected by western blot. Scanning electron and confocal microscopy were used to characterize exosomes and to study its uptake and transfer. Luciferase reporter plasmids and its mutant were used to confirm direct targeting. Furthermore, the functional significance of exosomal miR-10b was estimated by invasion assay.', 'In this study, we demonstrate that microRNA carrying exosomes can be transferred among different cell lines through direct uptake. miR-10b is highly expressed in metastatic breast cancer MDA-MB-231 cells as compared to non-metastatic breast cancer cells or non-malignant breast cells; it is actively secreted into medium via exosomes. In particular, nSMase2 or ceramide promotes the exosome-mediated miR-10b secretion whereas ceramide inhibitor suppresses this secretion. Moreover, upon uptake, miR-10b can suppress the protein level of its target genes such as HOXD10 and KLF4, indicating its functional significance. Finally, treatment with exosomes derived from MDA-MB-231 cells could induce the invasion ability of non-malignant HMLE cells.\Question: Does exosome-mediated transfer of miR-10b promote cell invasion in breast cancer?

Ex Output:
Together, our results suggest that a set of specific microRNAs may play an important role in modulating tumor microenvironment through exosomes. Thus, a better understanding of this process may aid in the development of novel therapeutic agents.


Ex Input:
Context: To find permanent prostate implant (PPI) pre-plan dosimetric parameters that predict post-implant D90 ≥ 140 Gy.', 'Pre-plans were evaluated for 504 patients undergoing PPI with (125)I seeds for low or intermediate risk prostate cancer. Baseline patient and disease factors, numbers of seeds, ratios of number of seeds to available positions (occupancy proportion), and distances between the 100% isodose line and edge of the prostate (margin) planned for the whole prostate (WP), superior (S), inferior (I), anterior (A), and posterior (P) halves, SA, SP, IA, and IP quarters, and superior (ST), inferior (IT), and middle (MT) thirds, and anterior (AT) and posterior (PT) middle one-sixth segments were analyzed by post-implant D90 subset (≥ 140 Gy vs. < 140 Gy).', '20% had post-implant D90 < 140 Gy (mean: 128.0 Gy, range: 97.5-139.2) vs. ≥ 140 Gy (mean: 154.4 Gy, range: 140.0-193.5). The D90 ≥ 140 Gy subset had larger AT and IA segment mean numbers of seeds (p = 0.01, 0.046), larger WP, S, A, SA, ST, AT, and MT segment mean margins (p = 0.01, 0.01, 0.001, 0.0001, 0.03, 0.005, 0.02), and lower PT segment occupancy proportion (p = 0.004). On multivariate analysis, independent predictors of post-implant D90 ≥ 140 Gy were increased SA mean margin, no pre-implant 5-α-reductase inhibitor, higher pre-plan D90, decreased P occupancy proportion, no pre-implant hormone therapy, and decreased SP mean margin.\Question: Do pre-plan parameters predict post-implant D90 ≥ 140 Gy for ( 125 ) I permanent prostate implants?

Ex Output:
Higher occupancy proportion and larger margins anteriorly and reduced occupancy proportion, and smaller margins posteriorly on PPI pre-plans predict post-implant D90 ≥ 140 Gy.


Ex Input:
Context: The purpose of this study was to explore an applicable approach for prolonging the survival of heterogenetic skin grafts on burn wounds with CTLA4Ig.', 'An adenovirus vector named Ad-CTLA4Ig, which could express human CTLA4Ig fusion protein, was constructed. Infecting and replicating in 293 cells, more Ad-CTLA4Ig and recombinant human CTLA4Ig (rhCTLA4Ig) were prepared, respectively. In a rat flame thermal injury model, the effect of rhCTLA4Ig on survival time of human skin graft on the eschar-excised rat burn wound was observed. Meanwhile, the efficiency of Ad-CTLA4Ig infecting cultured skin fibroblasts, keratinocytes, and partial-thickness skin samples were checked by CTLA4Ig expression essay. Then, the Ad-CTLA4Ig was administered locally on the eschar-excised wound and dermis of the skin graft, and the survival time of the human skin graft on burn wound was measured. The influence of the systemic immune function by rhCTLA4Ig and Ad-CTLA4Ig were also determined.', 'The prepared rhCTLA4Ig from the supernatant of Ad-CTLA4Ig-infected 293 cells was verified by sodium dodecyl sulfate polyacrylamide gel electrophoresis sodium dodecyl sulfate poly-acrylamide gel electrophoresis and Western blot. It was found that CTLA4Ig could significantly prolong the xenogeneic skin graft survival in a dosage-dependent manner. Interestingly, the survival time was longer when CTLA4Ig was used 24 hours posttransplantation than that at hour 0. The expression of CTLA4Ig could be observed in the cultured skin fibroblasts, keratinocytes, and skin pieces soon after Ad-CTLA4Ig transfection, as demonstrated by either immunocellular chemistry or immunohistochemistry assay. When Ad-CTLA4Ig was locally administered during skin transplantation on burn wound, the survival time was increased from 7.9 days of control group to 21.6 days, whereas the systemic immune function was not affected.\Question: Do cTLA4Ig introduced by adenovirus vector locally to prolong the survival of xenogeneic skin grafts on rat burn wounds?

Ex Output:

Administration of Ad-CTLA4Ig locally could prolong the survival time of xenogeneic skin graft on burn wound without significantly influencing the systemic immune function.