The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 176, 1631-1636, Copyright © 1992 by Rockefeller University Press

ARTICLES

Tumor necrosis factor alpha induces adhesion molecule expression on human fetal astrocytes

AA Hurwitz, WD Lyman, MP Guida, TM Calderon and JW Berman
Department of Pathology, Albert Einstein College of Medicine, Bronx, New York 10461.

Leukocyte adhesion molecules on endothelial cells of the blood-brain barrier may participate in the entry of leukocytes into the central nervous system. Because astrocytes are also a component of the blood- brain barrier and have been associated with inflammation, we studied the ability of astrocytes to express leukocyte adhesion molecules using Northern blot and immunocytochemical techniques. Astrocytes treated with the proinflammatory cytokine tumor necrosis factor alpha (TNF) expressed messenger RNA for the adhesion molecules E-selectin, vascular cell adhesion molecule 1, and intercellular adhesion molecule 1, as well as their corresponding proteins. In addition, TNF-treated astrocytes expressed a monocyte adhesion protein identified by our laboratory, recognized by the monoclonal antibody IG9. These results indicate that under inflammatory conditions in the central nervous system, such as multiple sclerosis and acquired immune deficiency syndrome, astrocyte expression of adhesion molecules may facilitate the migration of leukocytes and contribute to the disease process.
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