Regulation of insulin gene expression by glucose and calcium in transfected primary islet cultures.


Journal Article

To study the regulation of insulin gene expression by physiological regulators, primary cultures of rat islet cells were transfected with portions of the rat insulin I gene 5'-flanking sequence linked to the reporter gene chloramphenicol acetyltransferase (CAT). Incubation of the cells in increasing glucose concentrations led to a parallel increase in both CAT activity and CAT mRNA levels. Pretreatment of the cells with the beta-cell-specific toxin streptozotocin reduced CAT activity 97%. Beta-Cell-specific expression of CAT was also demonstrated by co-staining the transfected cells with antisera to both CAT and insulin. Experiments showing a reduction in the response to glucose in the presence of the calcium channel blocker verapamil suggest that calcium plays a role in the glucose response, possibly via regulation of factors interacting with this limited portion of the insulin gene.

Full Text

Cited Authors

  • German, MS; Moss, LG; Rutter, WJ

Published Date

  • December 1990

Published In

Volume / Issue

  • 265 / 36

Start / End Page

  • 22063 - 22066

PubMed ID

  • 1979979

Pubmed Central ID

  • 1979979

Electronic International Standard Serial Number (EISSN)

  • 1083-351X

International Standard Serial Number (ISSN)

  • 0021-9258


  • eng