Abstract:
OBJECTIVE:Human islet amyloid polypeptide (hIAPP) aggregation plays a major role in the development of islet amyloidosis in type 2 diabetes. It is known that extracellular hIAPP oligomers are toxic to pancreatic beta-cells and associated with apoptosis. We therefore investigated the molecular mechanism by which extracellular hIAPP mediates pancreatic beta-cell apoptosis. RESEARCH DESIGN AND METHODS:MIN6 cells and primary cultures of human pancreatic islets were treated with freshly dissolved hIAPP peptide. Morphology of the cultures was evaluated by electron microscopy. Gene expression was analyzed by microarray, RT-PCR, and immunoblot. Calcium levels were measured in fura-2-loaded cells. Apoptosis was quantified by cytometry. RESULTS:Increased expression of several heat shock proteins and activation of the spliced form of XBP-1, a transcription factor for overexpression of chaperones during endoplasmic reticulum (ER) stress, were detected together with morphological evidence of ER dysfunction. Intracellular calcium overload was detected in association with this process. Moreover, reduction in the proteasome activity, which was detected over time, contributed to the intracellular accumulation of ubiquitinated proteins, leading to a functional suppression of the ubiquitin-proteasome pathway. In addition, impairment of the proteasome function contributed to apoptosis, while, despite the presence of hIAPP, cell viability improved when a proteasome activator was overexpressed. The key cytotoxic events induced by extracellular hIAPP were also observed in treated human islets. CONCLUSIONS:Our data suggest that ER stress responses are intracellular signaling mechanisms induced by extracellular hIAPP aggregation and that impairment of the ubiquitin-proteasome pathway is implicated in ER stress-mediated pancreatic beta-cell apoptosis.
journal_name
Diabetesjournal_title
Diabetesauthors
Casas S,Gomis R,Gribble FM,Altirriba J,Knuutila S,Novials Adoi
10.2337/db07-0178subject
Has Abstractpub_date
2007-09-01 00:00:00pages
2284-94issue
9eissn
0012-1797issn
1939-327Xpii
db07-0178journal_volume
56pub_type
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