Interleukin-1beta upregulates functional expression of neurokinin-1 receptor (NK-1R) via NF-kappaB in astrocytes

Glia
Chang Jiang GuoWen Zhe Ho

Abstract

Cytokines and neuropeptides are modulators of neuroimmunoregulation in the central nervous system (CNS). The interaction of these modulators may have important implications in CNS diseases. We investigated whether interleukin-1beta (IL-1beta) modulates the expression of neurokinin-1 receptor (NK-1R), the primary receptor for substance P (SP), a potent neuropeptide in the CNS. IL-1beta upregulated NK-1R expression in human astroglioma cells (U87 MG) and primary rat astrocytes at both mRNA and protein levels. IL-1beta treatment of U87 MG cells and primary rat astrocytes led to an increase in cytosolic Ca(2+) in response to SP stimulation, indicating that IL-1beta-induced NK-1R is functional. CP-96,345, a specific non-peptide NK-1R antagonist, inhibited SP-induced rise of [Ca(2+)](i) in the astroglioma cells. Investigation of the mechanism responsible for IL-1beta action revealed that IL-1beta has the ability of activating nuclear factor-kappab (NF-kappaB). Caffeic acid phenethyl ester (CAPE), a specific inhibitor of NF-kappaB activation, not only abrogated IL-1beta-induced NF-kappaB promoter activation, but also blocked IL-1beta-mediated induction of NK-1R gene expression. These findings provide additional evidence that there is ...Continue Reading

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