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- W4313335844 abstract "Abstract Recent studies suggest that Fas expression on pancreatic β cells may be important in the development of autoimmune diabetes in the nonobese diabetic (NOD) mouse. To address this, pancreatic islets from NOD mice were analyzed by flow cytometry to directly identify which cells express Fas and Fas ligand (FasL) ex vivo and after in vitro culture with cytokines. Fas expression was not detected on β cells isolated from young (35 days) NOD mice. In vitro, incubation of NOD mouse islets with both IL-1 and IFN-γ was required to achieve sufficient Fas expression and sensitivity for islets to be susceptible to lysis by soluble FasL. In islets isolated from older (≥125 days) NOD mice, Fas expression was detected on a limited number of β cells (1–5%). FasL was not detected on β cells from either NOD or Fas-deficient MRLlpr/lpr islets. Also, both NOD and MRLlpr/lpr islets were equally susceptible to cytokine-induced cell death. This eliminates the possibility that cytokine-treated murine islet cells commit “suicide” due to simultaneous expression of Fas and FasL. Last, we show that NO is not required for cytokine-induced Fas expression and Fas-mediated apoptosis of islet cells. These findings indicate that β cells can be killed by Fas-dependent cytotoxicity; however, our results raise further doubts about the clinical significance of Fas-mediated β cell destruction because few Fas-positive cells were isolated immediately before the development of diabetes." @default.
- W4313335844 created "2023-01-06" @default.
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- W4313335844 date "1999-08-01" @default.
- W4313335844 modified "2023-10-10" @default.
- W4313335844 title "Evidence That β Cell Death in the Nonobese Diabetic Mouse Is Fas Independent" @default.
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- W4313335844 doi "https://doi.org/10.4049/jimmunol.163.3.1562" @default.
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