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Cells for Fas-mediated
Destruction in Insulin-dependent Diabetes Mellitus
By





From the * Division of Immunogenetics, Department of Pediatrics, University of Pittsburgh School of
Medicine, Rangos Research Center, Children's Hospital of Pittsburgh, Pittsburgh, PA 15213; Fas is an apoptosis-inducing surface receptor involved in controlling tissue homeostasis and
function at multiple sites. Here we show that
Department of Experimental Medicine and Biochemical Sciences, University of Rome "Tor Vergata",
00133 Rome, Italy; § Department of Pathology, University of Pittsburgh School of Medicine,
Pittsburgh, PA 15213; and
Laboratory of Immunology, Endocrinology Section, Institute of Clinical
Medicine, University of Palermo, 90127 Palermo, Italy
cells from the pancreata of newly diagnosed insulin-dependent diabetes mellitus (IDDM) patients express Fas and show extensive apoptosis
among those cells located in proximity to Fas ligand-expressing T lymphocytes infiltrating the
IDDM islets. Normal human pancreatic
cells that do not constitutively express Fas, become
strongly Fas positive after interleuken (IL)-1
exposure, and are then susceptible to Fas-mediated apoptosis. NG-monomethyl-L-arginine, an inhibitor of nitric oxide (NO) synthase, prevents
IL-1
-induced Fas expression, whereas the NO donors sodium nitroprusside and nitric oxide
releasing compound (NOC)-18, induce functional Fas expression in normal pancreatic
cells.
These findings suggest that NO-mediated upregulation of Fas contributes to pancreatic
cell
damage in IDDM.
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