1.
Nat Commun
; 13(1): 6461, 2022 10 29.
Artigo
em Inglês
| MEDLINE
| ID: mdl-36309517
RESUMO
Gi/o-coupled somatostatin or α2-adrenergic receptor activation stimulated ß-cell NKA activity, resulting in islet Ca2+ fluctuations. Furthermore, intra-islet paracrine activation of ß-cell Gi/o-GPCRs and NKAs by δ-cell somatostatin secretion slowed Ca2+ oscillations, which decreased insulin secretion. ß-cell membrane potential hyperpolarization resulting from Gi/o-GPCR activation was dependent on NKA phosphorylation by Src tyrosine kinases. Whereas, ß-cell NKA function was inhibited by cAMP-dependent PKA activity. These data reveal that NKA-mediated ß-cell membrane potential hyperpolarization is the primary and conserved mechanism for Gi/o-GPCR control of electrical excitability, Ca2+ handling, and insulin secretion.