Article (Scientific journals)
Temporal, regional, and cell-specific changes of iNOS expression after intrastriatal microinjection of interferon gamma and bacterial lipopolysaccharide.
HENEKA, Michael; Dumitrescu, Lucia; Löschmann, Peter-A. et al.
2000In Journal of Chemical Neuroanatomy, 18 (4), p. 167 - 179
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Keywords :
Antineoplastic Agents; Glial Fibrillary Acidic Protein; Lipopolysaccharides; 3-nitrotyrosine; Tyrosine; Interferon-gamma; Nitric Oxide Synthase; Nitric Oxide Synthase Type II; Nos2 protein, rat; Animals; Antineoplastic Agents/pharmacology; Astrocytes/chemistry; Astrocytes/drug effects; Astrocytes/enzymology; Corpus Callosum/cytology; Corpus Striatum/cytology; Glial Fibrillary Acidic Protein/analysis; In Situ Nick-End Labeling; Interferon-gamma/pharmacology; Lipopolysaccharides/pharmacology; Male; Microglia/chemistry; Microglia/drug effects; Microglia/enzymology; Microinjections; Neuritis/enzymology; Nitric Oxide Synthase/metabolism; Rats; Rats, Wistar; Tyrosine/analogs & derivatives; Tyrosine/analysis; Astrocytes; ED1; In vivo; Inducible nitric oxide synthase; Microglia; Nitric oxide; Cellular and Molecular Neuroscience
Abstract :
[en] Here we study expression of the inducible isoform of nitric oxide synthases after intrastriatal microinjection of interferon-gamma and bacterial lipopolysaccharide in the rat at different time points to detect time- and localisation-dependent changes of iNOS expression. Three different areas in the striatum and the corpus callosum were evaluated. Antibodies against the glial fibrillary acidic protein and the microglia/brain macrophage epitope ED1 were used to detect colocalization of inducible nitric oxide synthase with astrocytes or activated microglia/brain macrophages, respectively. Inducible nitric oxide synthase-positive cells occurred first in intravascular and perivascular cells at 4 h. Perivascular and parenchymal inducible nitric oxide synthase expression increased up to 24 h in the striatum, whereas in the corpus callosum inducible nitric oxide synthase expression was maximal after 16 h. Inducible nitric oxide synthase was still present in perivascular cells 7 days after immunostimulation. At all time points, inducible nitric oxide synthase was predominantly detected in ED1-positive microglia/brain. Nitrotyrosine immunohistochemistry was performed to detect NO-mediated nitration of proteins at all time points. Nitrotyrosine-positive neurons and microglial cells were detected from 24 h until 7 days after immunostimulation and were absent in controls. Detailed knowledge of the changes in the time course and cellular source of inducible nitric oxide synthase expression following brain immunostimulation provide a basis for establishing treatment strategies and windows of therapeutic intervention during neuroinflammation.
Disciplines :
Neurology
Author, co-author :
HENEKA, Michael  ;  Department of Neurology, University of Bonn, Sigmund-Freud Strasse 25, 53105, Bonn, Germany. m.heneka@uni-bonn.de
Dumitrescu, Lucia;  Department of Neurology, University of Bonn, 53105 Bonn, Germany
Löschmann, Peter-A.;  Department of Neurology, University of Bonn, 53105 Bonn, Germany
Wüllner, Ulrich;  Department of Neurology, University of Bonn, 53105 Bonn, Germany
Klockgether, Thomas;  Department of Neurology, University of Bonn, 53105 Bonn, Germany
External co-authors :
yes
Language :
English
Title :
Temporal, regional, and cell-specific changes of iNOS expression after intrastriatal microinjection of interferon gamma and bacterial lipopolysaccharide.
Publication date :
April 2000
Journal title :
Journal of Chemical Neuroanatomy
ISSN :
0891-0618
eISSN :
1873-6300
Publisher :
Elsevier BV, Netherlands
Volume :
18
Issue :
4
Pages :
167 - 179
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
This study was supported by a grant from the Deutsche Forschungsgemeinschaft (SFB 400, A8). The authors wish to thank Drs D.L. Feinstein and E. Galea for fruitful discussion and critical reading of the manuscript.
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