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The Journal of Immunology, Vol 157, Issue 3 974-977, Copyright © 1996 by American Association of Immunologists
CUTTING EDGE |
RM Lafrenie, LM Wahl, JS Epstein, IK Hewlett, KM Yamada and S Dhawan
Laboratories of Developmental Biology and Immunology, National Institute of Dental Research, National Institutes of Health, Bethesda, MD, USA.
Monocytes are susceptible to HIV infection and to activation by a regulatory gene product of the HIV genome, HIV-Tat. Recently, we have demonstrated that treatment with HIV-Tat up-regulates monocyte adhesion to the endothelium and increases metalloproteinase production. in the present study, we have examined the ability of the HIV-Tat protein to alter the migratory and invasive behavior of monocytes. Monocytes pretreated for 24 h with 10 ng/ml HIV-Tat exhibited enhanced migratory behavior compared with untreated monocytes in chemotaxis assays, both in the absence of a chemoattractant as well as in response to FMLP. in addition, HIV-Tat itself induced the migration of both untreated and HIV-Tat pretreated monocytes. Checkerboard analysis showed that monocytes migrated in response to an HIV-Tat concentration gradient, thus confirming the chemotactic characteristics of the HIV-Tat protein. Pretreatment of monocytes with 10 ng/ml HIV-Tat for 24 h also increased their ability to invade reconstituted extracellular membrane (Matrigel)- coated filters by 5-fold in the absence of chemoattractant. The presence of FMLP or HIV-Tat further enhanced invasion by both untreated and HIV-Tat-pretreated monocytes by more than 10-fold. Monocyte invasion was partially inhibited by the inclusion of anti-beta integrin Ab or tissue inhibitor of metalloproteinase (TIMP). Thus, for the first time, we present evidence that HIV-Tat can enhance the chemotactic and invasive behaviors of monocytes and propose an active role for HIV-Tat in the recruitment of monocytes into extravascular tissues, a process which may contribute to the destruction of tissues and cellular architecture often seen in patients with acquired immunodeficiency syndrome.
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