Abstract
The regulation of amylin gene expression is not clearly understood. In this study, we used the pancreatic β cell line, INS-1, to evaluate the regulation of amylin gene expression. When INS-1 cells were cultured in media containing IBMX, the ratio of amylin secretion to insulin secretion increased by 200%. This coincided with an increase in amylin mRNA content. Moreover, there was a three to four-fold increase in amylin promoter activity which was inhibited by the specific protein kinase A (PKA) inhibitor, H89. Electrophoretic mobility shift assays (EMSA) demonstrated that IBMX induced protein–DNA binding to the FLAT and CAAT elements of the amylin promoter. Competitive EMSA experiments revealed that these proteins are likely to be HNF-1 and NFY, respectively. IBMX-induced amylin promoter activity was inhibited by mutations in the FLAT and CAAT elements. These results indicate that amylin is positively regulated by cAMP and PKA through the transcription factors HNF-1 and NFY.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
