Abstract:
:Glucotoxicity plays a major role in pancreatic beta-cell apoptosis and diabetes progression, but the factors involved have remained largely unknown. Our recent studies have identified TXNIP (thioredoxin-interacting protein) as a novel pro-apoptotic beta-cell factor that is induced by glucose, suggesting that TXNIP may play a role in beta-cell glucotoxicity. Incubation of INS-1 beta-cells and isolated primary mouse and human islets at high glucose levels led to a significant increase in TXNIP as well as in apoptosis. Very similar results were obtained in vivo in islets of diabetic mice. To determine whether TXNIP plays a causative role in glucotoxic beta-cell death, we used TXNIP-deficient islets of HcB-19 mice harbouring a natural nonsense mutation in the TXNIP gene. We incubated islets of HcB-19 and C3H control mice at low and high glucose levels and assessed them for TXNIP expression and apoptosis. Interestingly, whereas in C3H islets, high glucose levels led again to significant elevation of TXNIP and apoptosis levels as measured by TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling) and cleaved caspase 3, no increase in apoptosis was observed in TXNIP-deficient HcB-19 islets, indicating that TXNIP is required for beta-cell death caused by glucotoxicity. Thus inhibition of TXNIP protects against glucotoxic beta-cell apoptosis and therefore may represent a novel therapeutic approach to halt diabetes progression.
journal_name
Biochem Soc Transjournal_title
Biochemical Society transactionsauthors
Shalev Adoi
10.1042/BST0360963subject
Has Abstractpub_date
2008-10-01 00:00:00pages
963-5issue
Pt 5eissn
0300-5127issn
1470-8752pii
BST0360963journal_volume
36pub_type
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