 |
||||
|
||||
|
||||
|
||||
Previous Article | Next Article
Volume 16, Number 17, Issue of September 1, 1996 pp. 5478-5487
Copyright ©1996 Society for NeuroscienceAstrocyte Growth, Reactivity, and the Target of the Antiproliferative Antibody, TAPA
Received Jan. 25, 1996; revised April 15, 1996; accepted June 11, 1996.
Eldon E. Geisert Jr.1, LiJuan Yang1, and Michael H. Irwin2 1 Department of Anatomy and Neurobiology, Health Science Center, University of Tennessee, Memphis, Tennessee 38163, and 2 Department of Comparative Medicine, University of Alabama, Birmingham, Alabama 35294
Reactive astrocytes form a scar after injury to the CNS that many investigators believe contributes to the lack of functional regeneration. In the present study, we identify an astrocytic membrane protein that appears to play an important role in reactive gliosis and scar formation. Cultures of rat astrocytes were used as a model system to produce and to screen monoclonal antibodies that would alter cell growth. One antibody, AMP1, was identified that depresses the mitotic activity of cultured glial cells and alters their morphology. Expression cloning reveals that the antigen on the external surface of the cultured glial cells has a high degree of homology with the human lymphocyte protein called Target of the Anti-Proliferative Antibody (TAPA-1; this rat protein will be referred to as rTAPA). rTAPA is a member of the tetramembrane-spanning superfamily of proteins and, as with other members of this family of proteins, rTAPA is associated with the regulation of cellular interactions and mitotic activity. After an injury to the cerebral cortex, there is a dramatic increase in AMP1 immunoreactivity that is spatially restricted to the reactive astrocytes at the glial scar. This change represents an upregulation of a membrane protein, rTAPA, that is approximately equal to the increase observed for glial fibrillary acidic protein. The high levels of rTAPA at the site of CNS injury and the AMP1 antibody perturbation studies indicate that rTAPA may play a prominent role in the response of astrocytes to injury and in glial scar formation.
Key words: astrocyte; regeneration; cell adhesion; brain; reactive gliosis; injury; rat; TAPA;
actinin
This article has been cited by other articles:
F. Vazquez-Chona, B. K. Song, and E. E. Geisert Jr
Temporal Changes in Gene Expression after Injury in the Rat Retina
Invest. Ophthalmol. Vis. Sci., August 1, 2004; 45(8): 2737 - 2746.
[Abstract] [Full Text] [PDF]
E. E. Geisert Jr, H. J. Abel, L. Fan, and G. R. Geisert
Retinal Pigment Epithelium of the Rat Express CD81, the Target of the Anti-proliferative Antibody (TAPA)
Invest. Ophthalmol. Vis. Sci., January 1, 2002; 43(1): 274 - 280.
[Abstract] [Full Text] [PDF]
P. Pileri, Y. Uematsu, S. Campagnoli, G. Galli, F. Falugi, R. Petracca, A. J. Weiner, M. Houghton, D. Rosa, G. Grandi, et al.
Binding of Hepatitis C Virus to CD81
Science, October 30, 1998; 282(5390): 938 - 941.
[Abstract] [Full Text]
T. J. Fleming, E. Donnadieu, C. H. Song, F. V. Laethem, S. J. Galli, and J.-P. Kinet
Negative Regulation of Fcepsilon RI-mediated Degranulation by CD81
J. Exp. Med., October 20, 1997; 186(8): 1307 - 1314.
[Abstract] [Full Text] [PDF]
|
|
|
|
 |
|