Role of N-glycans and SDF-1alpha on the coassociation of CD4 with CXCR4 at the plasma membrane of monocytic cells and blood lymphocytes |
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Authors: | Mbemba Elisabeth Saffar Line Gattegno Liliane |
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Affiliation: | Laboratoire de Biologie Cellulaire, EA 3510, Biothérapies, Bénéfices et Risques, Unité de Formation et de Recherche-Santé Médecine et Biologie Humaine, Université Paris XIII, 74 rue Marcel Cachin, 93017 Bobigny, France. |
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Abstract: | CXCR4 is a coreceptor, along with CD4, for human immunodeficiency virus type 1 (HIV-1). Trimolecular complexes between HIV-1 glycoprotein (gp)120, CD4 and CXCR4 constitute a prerequisite for HIV entry. We studied whether CD4 is associated with CXCR4 on CD4+ CXCR4+ cells. Using the conformation-dependent anti-CXCR4 mAb 12G5, CD4 was coimmunoprecipitated with CXCR4 from the membrane of U937 cells which support HIV-1(LAI) efficient infection, and from that of peripheral blood lymphocytes (PBL). CD4 association with CXCR4 increased upon PBL coculture for 5 days with autologous monocytes, decreased upon treatment of the cells or the CD4-CXCR4 complex with either N-glycanase or stromal cell derived factor-1alpha (SDF-1alpha) and was abolished by incubation of the cells with both, N-glycanase and SDF-1alpha. This indicates that glycans are partly involved in CD4 association with CXCR4 and may partly explain the inhibitory effect of SDF-1alpha on HIV infection. |
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