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Involvement of Ca2+, CaMK II and PKA in EGb 761-induced insulin secretion in INS-1 cells.

Authors
Choi, SE  | Shin, HC | Kim, HE | Lee, SJ | Jang, HJ | Lee, KW  | Kang, Y
Citation
Journal of ethnopharmacology, 110(1). : 49-55, 2007
Journal Title
Journal of ethnopharmacology
ISSN
0378-87411872-7573
Abstract
EGb 761, a standardized form of Ginkgo biloba L. (Ginkgoaceae) leaf extract, was recently reported to increase pancreatic beta-cell function. To determine whether EGb 761 elicits insulin secretion directly, we treated INS-1 rat beta cells with EGb 761 and then measured insulin release. Treatment of EGb 761 (50 microg/ml) significantly stimulated insulin secretion in INS-1 cells, compared with untreated control (p<0.05) and the stimulatory effect of EGb 761 on insulin secretion was dose-dependent. To elucidate the mechanism of EGb 761-induced insulin secretion, we investigated the involvement of calcium. The treatment with nifedipine, an L-type calcium channel blocker, prevented EGb 761-induced insulin secretion and furthermore, EGb 761 itself elevated [Ca(2+)](i), suggesting the involvement of calcium in this process. To identity the protein kinases involved in EGb 761-induced insulin secretion, INS-1 cells were treated with different kinase inhibitors and their effects on EGb 761-induced secretion were investigated. KN62 and H89, calium/calmodulin kinase (CaMK) II and protein kinase A (PKA) inhibitor, respectively, significantly reduced EGb 761-induced insulin secretion. Immunoblotting studies showed an increase in the phosphorylated-forms of CaMK II and of PKA substrates after EGb 761 treatment. Our data suggest that EGb 761-induced insulin secretion is mediated by [Ca(2+)](i) elevation and subsequent activation of CaMK II and PKA.
MeSH

DOI
10.1016/j.jep.2006.09.001
PMID
17046186
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Physiology
Journal Papers > School of Medicine / Graduate School of Medicine > Endocrinology & Metabolism
Ajou Authors
강, 엽  |  이, 관우  |  최, 성이
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