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Protection by a manganese porphyrin of endogenous peroxynitrite‐induced death of glial cells via inhibition of mitochondrial transmembrane potential decrease
Author(s) -
Choi In Young,
Lee Sun Jung,
Ju Chung,
Nam Wonwoo,
Kim HyoungChun,
Ko Kwang Ho,
Kim WonKi
Publication year - 2000
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/1098-1136(200008)31:2<155::aid-glia70>3.0.co;2-1
Subject(s) - peroxynitrite , biology , endogeny , mitochondrion , microbiology and biotechnology , porphyrin , transmembrane protein , manganese , membrane potential , biochemistry , biophysics , neuroscience , enzyme , chemistry , superoxide , receptor , organic chemistry
In the cerebral ischemic penumbra, progressive metabolic deterioration eventually leads to death of glial cells. The exact mechanism for the death of glial cells is unclear. Here we report that under glucose‐deprived conditions immunostimulated glial cells rapidly underwent death via production of large amounts of peroxynitrite. The cell‐permeable Mn(III)tetrakis(N‐methyl‐4′‐pyridyl)porphyrin (MnTMPyP) caused a concentration‐dependent attenuation of the increased death in glucose‐deprived immunostimulated glial cells. The structurally related compound H 2 TMPyP, which lacks metals, did not attenuate this augmented cell death. MnTMPyP prevented the elevation in nitrotyrosine immunoreactivity (a marker of ONOO − ) in glucose‐deprived immunostimulated glial cells. In glucose‐deprived glial cells, MnTMPyP also completely blocked the augmented death and nitrotyrosine immunoreactivity induced by the ONOO − ‐producing reagent 3‐morpholinosydnonimine (SIN‐1). The mitochondrial transmembrane potential (MTP), as measured using the dye JC‐1, was rapidly decreased in immunostimulated or SIN‐1‐treated glial cells deprived of glucose. MnTMPyP, but not H 2 TMPyP, blocked the depolarization of MTP in those glial cells. The present data, at least in part, provide evidence for how glial cells die in the postischemic and/or recurrent ischemic brain. GLIA 31:155–164, 2000. © 2000 Wiley‐Liss, Inc.