Topics on the Na+/Ca2+ Exchanger:Responses of Na+/Ca2+ Exchanger to Interferon-γ and Nitric Oxide in Cultured Microglia

Journal of Pharmacological Sciences

Akemichi Baba²  Takayuki Nagano³  Motohiko Takemura³  Toshio Matsuda¹ 

[1]Laboratory of Medicinal Pharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Japan

[2]Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Japan

[3]Department of Pharmacology, Hyogo College of Medicine, Japan

关键词: Na+/Ca2+ exchanger;    interferon-γ;    nitric oxide;    microglia;    endoplasmic reticulum stress;   

DOI  :  10.1254/jphs.FMJ06002X4

学科分类：药学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(38)Cited-By(9)The Na+/Ca2+ exchanger (NCX) plays a role in regulation of intracellular Ca2+ levels, but little is known about the functional role of NCX in microglia. To clarify the role of NCX in microglia, we studied the responses of NCX to pathological conditions such as interferon-γ or nitric oxide (NO) exposure. Treatment with interferon-γ caused a biphasic increase in NCX activity. The delayed increase in NCX activity was accompanied by increases in the mRNA and protein levels. Pharmacological studies show that protein kinase C and tyrosine kinase are involved in the transient and delayed increases in NCX activity, and the extracellular signal-regulated protein kinase is involved in the delayed increase in NCX activity. On the other hand, NO causes apoptotic cell death in cultured microglia. We observed, using the specific NCX inhibitor SEA0400, that NO activates NCX activity and NCX is involved in NO-induced depletion of Ca2+ in the endoplasmic reticulum (ER), leading to ER stress. These results suggest that NCX is involved in the regulation of Ca2+ levels in the ER. The responses of NCX to interferon-γ and NO implies that NCX plays a key role in microglial function.

【 授权许可】

Unknown