Shohei Segawa

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Previously, we demonstrated that extracellular zinc plays a key role in transient global ischemia-induced microglial activation through sequential activation of NADPH oxidase and poly(ADP-ribose) polymerase (PARP)-1. However, it remains unclear how zinc causes the sequential activation of microglia. Here, we examined whether transporter-mediated zinc uptake(More)
We examined the translocation of diacylglycerol kinase (DGK) alpha and gamma fused with green fluorescent protein in living Chinese hamster ovary K1 cells (CHO-K1) and investigated temporal and spatial correlations between DGK and protein kinase C (PKC) when both kinases are overexpressed. DGKalpha and gamma were present throughout the cytoplasm of CHO-K1(More)
AIM Astrocytes contribute to the maintenance of brain homeostasis via the release of gliotransmitters such as ATP and glutamate. Here we examined whether zinc was released from astrocytes under stress-loaded conditions, and was involved in the regulation of microglial activity as a gliotransmitter. MAIN METHODS Hypoosmotic stress was loaded to astrocytes(More)
To elucidate the regulatory mechanism for extracellular zinc in the CNS, we examined the zinc uptake characteristics in mouse astrocytes and microglia. Zinc was taken up into the two cell types time-dependently, and the cell-to-medium concentration (C/M) ratio in the initial uptake phase in astrocytes was significantly smaller than that in microglia, while(More)
AIM In this study, we evaluated the effect of divalent metal cations on zinc uptake via mouse Zrt/Irt-like protein 1 (mZIP1), a ubiquitously expressed zinc transporter, which plays a role in maintenance of cellular zinc homeostasis, using HEK293T cells overexpressing it. MAIN METHODS mZIP1 cDNA, which was cloned from mouse microglia, was transfected into(More)
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