Abstract
Evidence has previously been presented that circadian rhythms play a role in islet hormone secretion. Here, RT-PCR was used to monitor the circadian expression of ether-a-go-go-related gene (Erg) potassium channel isoforms and Erg1 splice variants. Immunohistochemistry was used to identify the pancreatic distribution patterns of ERG1a and ERG1b, as well as ERG2 and ERG3. The influence of ERG on insulin secretion was monitored by perfusion of rat INS-1 beta-cells with the blockers E-4031 and rBeKm-1. We identified Erg1a, Erg1b, Erg2 and Erg3 transcripts in islets and INS-1 cells. Immunohistochemistry showed differential expression of ERG isoforms in the islet. Ca(2+) imaging and electrophysiological recordings of INS-1 cells during ERG blocking by E-4031 indicated functional ERG channels. Serum shock treatment of INS-1 cells elicited a time-dependent expression response for Erg transcripts. These results add to the current understanding of the function of ERG channels in beta-cells and the circadian secretion processes of insulin.
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.
