Long-term in vitro culture of hamster pancreatic ß-cells and induction of adenocarcinoma by treatment with N-nitrosobis(2-oxopropyl)amine.

OBJECTIVES: Earlier studies indicated that hamster pancreatic ductal adenocarcinoma not only derives from ductal/ductular structures but also from cells within the islet. So far unidentified cells within the islet are responsive to the carcinogenic effect of N-nitrosobis (2-oxopropyl) amine (BOP) forming poorly differentiated ductal adenocarcinoma. However, studies indicated a major role of ß-cells during carcinogenesis. To find out, if ß-cells are the primary target cells of BOP and if they are capable to form ductal adenocarcinoma after malignant transformation, we established a long-term culture of undifferentiated cells deriving from isolated ß-cells and treated them with BOP. METHODS: Langerhans' islets from pancreata of Syrian golden hamsters were isolated and dispersed into single cells by dispase digestion. Cells were labeled with a highly specific ß-cell surface antibody (K14D10) and these K14D10+ cells were extracted from the suspension by paramagnetic Dynabeads. Cells were cultured in vitro and treated with BOP. Untreated cells served as control. RESULTS: K14D10+ cells formed a monolayer and produced insulin over a period of 28 days in culture. However, with time in culture they became undifferentiated with a higher proliferation rate and after about 60 days in culture BOP treated cells showed anchorage independent growth. These cells autotransplanted s.c. formed a well-differentiated ductal adenocarcinoma. CONCLUSIONS: Pancreatic ß-cells are the primary target of BOP without necessarily being embedded in the compound of the Langerhans' islet. With time in culture, they give rise to undifferentiated cells and after malignant transformation they are able to form ductal adenocarcinoma.

A new era of seeking knowledge for #lymphedema on social media: A detailed Instagram hashtag analysis.

Instagram® is one of the most active social media platforms with over a billion users worldwide. Since the importance of education on lymphedema has been established due to the chronic nature of the disease, seeking knowledge attracts much attention not only clinically but also on social platforms such as Instagram ®. Our aim was to examine content by analyzing posts tagged with hashtags on Instagram ® related to lymphedema. Nine predefined hashtags related to lymphedema were used to search posts uploaded to Instagram® via the Apify tool. Retrieved public posts were classified and analyzed by four researchers for their content and post-type. We found that the vast majority of sharing on Instagram® in the context of lymphedema and its related aspects have relatively low scores for both relevancy and accuracy with a 77% irrelevancy rate. The best posts were those determined to be educational, which were found 57% relevant and correct. Medical professionals should consider that disseminating true guidance and therapy carries importance for patients with lymphedema and treatment success. The ability for patients to reach knowledge via social media might also be an important aspect in reliving suffering due to lymphedema. However, our results demonstrate that Instagram® might not be a good platform for patients to discover reliable information about lymphedema.

Successful Treatment of Cutaneous Blastomycosis in a Renal Transplant Patient With BK Virus Infection: A Case Report.

This is the first case report from Turkey to describe a renal transplant complicated by subcutaneous blastomycosis and BK infection. The cutaneous lesions were successfully treated with amphotericin B and fluconazole. The presence of BK infection led to graft failure. Infections with uncommonly seen organisms should be kept in mind due to the impaired T-cell immunity in transplantation.