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Increased store-operated Ca²⁺ entry mediated by GNB5 and STIM1
The Korean Journal of Physiology and Pharmacology ; : 343-348, 2018.
Article in English | WPRIM | ID: wpr-728611
ABSTRACT
Recent human genetic studies have shown that Gβ5 is related to various clinical symptoms, such as sinus bradycardia, cognitive disability, and attention deficit hyperactivity disorder. Although the calcium signaling cascade is closely associated with a heterotrimeric G-protein, the function of Gβ5 in calcium signaling and its relevance to clinical symptoms remain unknown. In this study, we investigated the in vitro changes of store-operated calcium entry (SOCE) with exogenous expression of Gβ5. The cells expressing Gβ5 had enhanced SOCE after depletion of calcium ion inside the endoplasmic reticulum. Gβ5 also augmented Stim1- and Orai1-dependent SOCE. An ORAI1 loss-of-function mutant did not show inhibition of Gβ5-induced SOCE, and a STIM1-ERM truncation mutant showed no enhancement of SOCE. These results suggested a novel role of GNB5 and Stim1, and provided insight into the regulatory mechanism of SOCE.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Attention Deficit Disorder with Hyperactivity / In Vitro Techniques / Bradycardia / Calcium / GTP-Binding Proteins / Calcium Signaling / Endoplasmic Reticulum Limits: Humans Language: English Journal: The Korean Journal of Physiology and Pharmacology Year: 2018 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Attention Deficit Disorder with Hyperactivity / In Vitro Techniques / Bradycardia / Calcium / GTP-Binding Proteins / Calcium Signaling / Endoplasmic Reticulum Limits: Humans Language: English Journal: The Korean Journal of Physiology and Pharmacology Year: 2018 Type: Article