Cdk5-dependent regulation of glucose-stimulated insulin secretion.
Tight glycemic control in individuals with diabetes mellitus is essential to prevent or delay its complications. Present treatments to reduce hyperglycemia mainly target the ATP-sensitive K(+) (K(ATP)) channel of pancreatic beta cells to increase insulin secretion. These current approaches are often associated with the side effect of hypoglycemia. Here we show that inhibition of the activity of cyclin-dependent kinase 5 (Cdk5) enhanced insulin secretion under conditions of stimulation by high glucose but not low glucose in MIN6 cells and pancreatic islets. The role of Cdk5 in regulation of insulin secretion was confirmed in pancreatic beta cells deficient in p35, an activator of Cdk5. p35-knockout mice also showed enhanced insulin secretion in response to a glucose challenge. Cdk5 kinase inhibition enhanced the inward whole-cell Ca(2+) channel current and increased Ca(2+) influx across the L-type voltage-dependent Ca(2+) channel (L-VDCC) upon stimulation with high glucose in beta cells, but had no effect on Ca(2+) influx without glucose stimulation. The inhibitory regulation by Cdk5 on the L-VDCC was attributed to the phosphorylation of loop II-III of the alpha(1C) subunit of L-VDCC at Ser783, which prevented the binding to SNARE proteins and subsequently resulted in a decrease of the activity of L-VDCC. These results suggest that Cdk5/p35 may be a drug target for the regulation of glucose-stimulated insulin secretion.
Wei
Fan-Yan
FY
Department of Physiology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan.
Nagashima
Kazuaki
K
Ohshima
Toshio
T
Saheki
Yasunori
Y
Lu
Yun-Fei
YF
Matsushita
Masayuki
M
Yamada
Yuichiro
Y
Mikoshiba
Katsuhiko
K
Seino
Yutaka
Y
Matsui
Hideki
H
Tomizawa
Kazuhito
K
D000818:Animals; D002460:Cell Line; D051360:Cyclin-Dependent Kinase 5 / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism / Q000494:pharmacology*; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D050417:Insulin-Secreting Cells / Q000187:drug effects / Q000378:metabolism; D007701:Kinetin; D051379:Mice; D009419:Nerve Tissue Proteins / Q000172:deficiency / Q000235:genetics / Q000378:metabolism; D051381:Rats; D015398:Signal Transduction / Q000187:drug effects
D007328:Insulin; D009419:Nerve Tissue Proteins; C089495:neuronal Cdk5 activator (p25-p35); C090046:olomoucine; D051360:Cyclin-Dependent Kinase 5; D005947:Glucose; D007701:Kinetin