CD38-mediated Ca(2+) Signaling Contributes to Glucagon-induced Hepatic Gluconeogenesis

Overview

Journal Sci Rep

Specialty Science

Date 2015 Jun 4

PMID 26038839

Citations 16

Authors

So-Young Rah

Uh-Hyun Kim

Affiliations

Soon will be listed here.

Abstract

CD38 is a multifunctional enzyme for the synthesis of Ca(2+) second messengers. Glucagon promotes hepatic glucose production through Ca(2+) signaling in the fasting condition. In this study, we investigated the role of CD38 in the glucagon signaling of hepatocytes. Here, we show that glucagon induces cyclic ADP-ribose (cADPR) production and sustained Ca(2+) increases via CD38 in hepatocytes. 8-Br-cADPR, an antagonistic cADPR analog, completely blocked glucagon-induced Ca(2+) increases and phosphorylation of cAMP response element-binding protein (CREB). Moreover, glucagon-induced sustained Ca(2+) signals and translocation of CREB-regulated transcription coactivator 2 to the nucleus were absent and glucagon-induced glucose production and expression of glucose-6-phosphatase (G6Pase) and phosphoenolpyruvate carboxykinase (Pck1) are remarkably reduced in hepatocytes from CD38(-/-) mice. Furthermore, in the fasting condition, CD38(-/-) mice have decreased blood glucose and hepatic expression of G6Pase and Pck1 compared to wild type mice. Our data suggest that CD38/cADPR-mediated Ca(2+) signals play a key role in glucagon-induced gluconeogenesis in hepatocytes, and that the signal pathway has significant clinical implications in metabolic diseases, including type 2 diabetes.

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