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*
A. I. Virtanen Institute for Molecular Sciences, University of Kuopio, Kuopio, Finland; and
Department of Clinical Pathology, Kuopio University Hospital, Kuopio, Finland
Glutamate excitotoxicity to a large extent is mediated through
activation of the N-methyl-D-aspartate
(NMDA)-gated ion channels in several neurodegenerative diseases and
ischemic stroke. Minocycline, a tetracycline derivative with
antiinflammatory effects, inhibits IL-1
-converting enzyme and
inducible nitric oxide synthase up-regulation in animal models of
ischemic stroke and Huntingtons disease and is therapeutic in these
disease animal models. Here we report that nanomolar concentrations of
minocycline protect neurons in mixed spinal cord cultures against NMDA
excitotoxicity. NMDA treatment alone induced microglial proliferation,
which preceded neuronal death, and administration of extra microglial
cells on top of these cultures enhanced the NMDA neurotoxicity.
Minocycline inhibited all these responses to NMDA. Minocycline also
prevented the NMDA-induced proliferation of microglial cells and the
increased release of IL-1
and nitric oxide in pure microglia
cultures. Finally, minocycline inhibited the NMDA-induced activation of
p38 mitogen-activated protein kinase (MAPK) in microglial cells, and a
specific p38 MAPK inhibitor, but not a p44/42 MAPK inhibitor, reduced
the NMDA toxicity. Together, these results suggest that microglial
activation contributes to NMDA excitotoxicity and that minocycline, a
tetracycline derivative, represents a potential therapeutic agent for
brain diseases.
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