Expression of many disease-related aggregation-prone proteins results in cytotoxicity and the formation of large intracellular inclusion bodies. To gain insight into the role of inclusions in pathology and the in situ structure of protein aggregates inside cells, we employ advanced cryo-electron tomography methods to analyze the structure of inclusions formed by polyglutamine (polyQ)-expanded huntingtin exon 1 within their intact cellular context. In primary mouse neurons and immortalized human cells, polyQ inclusions consist of amyloid-like fibrils that interact with cellular endomembranes, particularly of the endoplasmic reticulum (ER). Interactions with these fibrils lead to membrane deformation, the local impairment of ER organization, and profound alterations in ER membrane dynamics at the inclusion periphery. These results suggest that aberrant interactions between fibrils and endomembranes contribute to the deleterious cellular effects of protein aggregation. VIDEO ABSTRACT.

SummaryWe previously developed a mass spectrometry-based method, dynamic organellar maps, for the determination of protein subcellular localization and identification of translocation events in comparative experiments. The use of metabolic labeling for quantification (stable isotope labeling by amino acids in cell culture [SILAC]) renders the method best suited to cells grown in culture. Here, we have adapted the workflow to both label-free quantification (LFQ) and chemical labeling/multiplexing strategies (tandem mass tagging [TMT]). Both methods are highly effective for the generation of organellar maps and capture of protein translocations. Furthermore, application of label-free organellar mapping to acutely isolated mouse primary neurons provided subcellular localization and copy-number information for over 8,000 proteins, allowing a detailed analysis of organellar organization. Our study extends the scope of dynamic organellar maps to any cell type or tissue and also to high-throughput screening.

The present study suggests that robotic VVF repair is a better option for recurrent fistulas in view of its reduced morbidity, without compromising the results.

Introduction: Organ transplantation in Libya depends exclusively on donations from live relatives. This limitation increases mortality and prolongs the patients' suffering and waiting time. Objectives: The aims of this study were to explore willingness to donate organs after death and to identify the reasons for refusal. Methods: A population-based crosssectional study was conducted from April to July 2008 on a cluster sample of 1652 persons (58% males and 42% females). The questionnaire included demographic information and mainly enquired about willingness to donate organs after death and the reasons for refusal when applicable. Results: About one-third (29.7%) of participants were in favor of donating their organs after death, 60.1% refused and 10.2% were undecided. Willingness was significantly associated with being male, younger age, having a college or graduate degree, and being single (P <0.05 for all). Lack of adequate knowledge about the importance of deceased organ donation and uncertainty about its religious implications were the most predominant reasons for refusal (43.8% and 39.5%, respectively). Other reasons included ethical concerns about retrieving organs from dead bodies (37.9%), preference for being buried intact (28%), and uneasiness about the idea of cadaver manipulation (33%). Conclusion: There were a considerable resistance to deceased organ donation, especially among females, those of older age, married people, and those with a low education level. The barriers to cadaveric donations were lack of adequate knowledge, unease about body manipulation, and concerns about religious implications. Public educational campaigns should be coordinated with religious leadership.

Malignant peripheral nerve sheath tumor with rhabdomyoblastic differentiation, malignant triton tumor, has a rare incidence. We report such a case in a 40-year-old male who presented with a mass over the buttock. He was a previously diagnosed case of neurofibroma in the same area. Histomorphology supported by immunostaining with S-100 protein confirmed the diagnosis. Malignant triton tumor has a poor prognosis owing to its aggressive biological behavior. The fact that the presence of this tumor in the buttock region is extremely rare has prompted the authors to report this case.