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J. Cell Biol.,
Volume 145, Number 3, May 3, 1999 503-514


* Department of Medical Biochemistry and In response to injury of the central nervous
system, astrocytes become reactive and express high
levels of the intermediate filament (IF) proteins glial
fibrillary acidic protein (GFAP), vimentin, and nestin.
We have shown that astrocytes in mice deficient for
both GFAP and vimentin (GFAP
Department of Anatomy and Cell Biology, Gothenburg University, SE-405 30 Gothenburg, Sweden; and § Department of Cell and Molecular Biology, Medical Nobel Institute,
Department of Neuroscience,
Karolinska Institute and ¶ Ludwig Institute for Cancer Research, Stockholm Branch, SE-17177 Stockholm, Sweden
/
vim
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) cannot
form IFs even when nestin is expressed and are thus devoid of IFs in their reactive state. Here, we have studied
the reaction to injury in the central nervous system in
GFAP
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, vimentin
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, or GFAP
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vim
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mice. Glial scar formation appeared normal after spinal cord
or brain lesions in GFAP
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or vimentin
/
mice,
but was impaired in GFAP
/
vim
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mice that developed less dense scars frequently accompanied by bleeding. These results show that GFAP and vimentin
are required for proper glial scar formation in the injured central nervous system and that some degree of
functional overlap exists between these IF proteins.
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