Unknown

Dataset Information

0

Chemical dissection of the link between streptozotocin, O-GlcNAc, and pancreatic cell death.


ABSTRACT: Streptozotocin is a natural product that selectively kills insulin-secreting beta cells, and is widely used to generate mouse models of diabetes or treat pancreatic tumors. Several studies suggest that streptozotocin toxicity stems from its N-nitrosourea moiety releasing nitric oxide and possessing DNA alkylating activity. However, it has also been proposed that streptozotocin induces apoptosis by inhibiting O-GlcNAcase, an enzyme that, together with O-GlcNAc transferase, is important for dynamic intracellular protein O-glycosylation. We have used galacto-streptozotocin to chemically dissect the link between O-GlcNAcase inhibition and apoptosis. Using X-ray crystallography, enzymology, and cell biological studies on an insulinoma cell line, we show that, whereas streptozotocin competitively inhibits O-GlcNAcase and induces apoptosis, its galacto-configured derivative no longer inhibits O-GlcNAcase, yet still induces apoptosis. This supports a general chemical poison mode of action for streptozotocin, suggesting the need for using more specific inhibitors to study protein O-GlcNAcylation.

SUBMITTER: Pathak S 

PROVIDER: S-EPMC2568864 | biostudies-literature | 2008 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Chemical dissection of the link between streptozotocin, O-GlcNAc, and pancreatic cell death.

Pathak Shalini S   Dorfmueller Helge C HC   Borodkin Vladimir S VS   van Aalten Daan M F DM  

Chemistry & biology 20080801 8


Streptozotocin is a natural product that selectively kills insulin-secreting beta cells, and is widely used to generate mouse models of diabetes or treat pancreatic tumors. Several studies suggest that streptozotocin toxicity stems from its N-nitrosourea moiety releasing nitric oxide and possessing DNA alkylating activity. However, it has also been proposed that streptozotocin induces apoptosis by inhibiting O-GlcNAcase, an enzyme that, together with O-GlcNAc transferase, is important for dynami  ...[more]

Similar Datasets

| S-EPMC4589499 | biostudies-literature
| S-EPMC4154244 | biostudies-literature
| S-EPMC7484558 | biostudies-literature
| S-EPMC1221809 | biostudies-other
| S-EPMC3129478 | biostudies-literature
| S-EPMC7184252 | biostudies-literature
| S-EPMC4693424 | biostudies-literature
| S-EPMC8258229 | biostudies-literature
| S-EPMC4859755 | biostudies-literature
| S-EPMC7961445 | biostudies-literature