Abstract:
:The secretion of glucagon by pancreatic alpha cells is regulated by a number of external and intrinsic factors. While the electrophysiological processes linking a lowering of glucose concentrations to an increased glucagon release are well characterized, the evidence for the identity and function of the glucose sensor is still incomplete. In the present study we aimed to address two unsolved problems: (1) do individual alpha cells have the intrinsic capability to regulate glucagon secretion by glucose, and (2) is glucokinase the alpha cell glucose sensor in this scenario. Single cell RT-PCR was used to confirm that glucokinase is the main glucose-phosphorylating enzyme expressed in rat pancreatic alpha cells. Modulation of glucokinase activity by pharmacological activators and inhibitors led to a lowering or an increase of the glucose threshold of glucagon release from single alpha cells, measured by TIRF microscopy, respectively. Knockdown of glucokinase expression resulted in a loss of glucose control of glucagon secretion. Taken together this study provides evidence for a crucial role of glucokinase in intrinsic glucose regulation of glucagon release in rat alpha cells.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Moede T,Leibiger B,Vaca Sanchez P,Daré E,Köhler M,Muhandiramlage TP,Leibiger IB,Berggren POdoi
10.1038/s41598-020-76863-zsubject
Has Abstractpub_date
2020-11-19 00:00:00pages
20145issue
1issn
2045-2322pii
10.1038/s41598-020-76863-zjournal_volume
10pub_type
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