G(i/o) protein-coupled receptor inhibition of beta-cell electrical excitability and insulin secretion depends on Na(+)/K(+) ATPase activation.

G(i/o) protein-coupled receptor inhibition of beta-cell electrical excitability and insulin secretion depends on Na(+)/K(+) ATPase activation.
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DOI:
10.1038/s41467-022-34166-z
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发表时间:
2022-10-29
影响因子:
16.6
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--
中科院分区:
综合性期刊1区
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Gi/o偶联的生长抑素或α2肾上腺素能受体激活可刺激β细胞的NKA活性,导致胰岛钙离子波动。此外,β细胞的生长抑素分泌激活δ细胞Gi/o-GPCRs和NKA的胰岛旁分泌可减缓钙振荡,从而减少胰岛素的分泌。Gi/o-β激活引起的NKA膜电位超极化依赖于Src酪氨酸激酶对NKA的磷酸化。而cAMP依赖的β活性抑制了PKA的功能。这些数据表明,NKA介导的β细胞膜电位超极化是Gi/o-GPCR控制电兴奋性、钙处理和胰岛素分泌的主要和保守的机制。Gi/o蛋白偶联受体(Gi/o-GPCRs)通过减少钙离子内流来限制β细胞胰岛素的分泌;然而,其潜在的机制尚未确定。在这里,作者发现Gi/o-GPCRs通过激活Na+/K+ATPase使小鼠和人β细胞膜电位超极化。
Gi/o-coupled somatostatin or α2-adrenergic receptor activation stimulated β-cell NKA activity, resulting in islet Ca2+ fluctuations. Furthermore, intra-islet paracrine activation of β-cell Gi/o-GPCRs and NKAs by δ-cell somatostatin secretion slowed Ca2+ oscillations, which decreased insulin secretion. β-cell membrane potential hyperpolarization resulting from Gi/o-GPCR activation was dependent on NKA phosphorylation by Src tyrosine kinases. Whereas, β-cell NKA function was inhibited by cAMP-dependent PKA activity. These data reveal that NKA-mediated β-cell membrane potential hyperpolarization is the primary and conserved mechanism for Gi/o-GPCR control of electrical excitability, Ca2+ handling, and insulin secretion. Gi/o protein-coupled receptors (Gi/o-GPCRs) limit β-cell insulin secretion by decreasing Ca2+ entry; however, the underlying mechanism has not been identified. Here, the authors show that Gi/o-GPCRs hyperpolarize mouse and human β-cell membrane potential by activating Na+/K+ATPases.
细胞因子介导的K(+)通道活性的变化促进了自适应Ca(2+)反应,该反应在炎症过程中维持β细胞胰岛素分泌。
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