Cell-to-cell contact via measles virus haemagglutinin-CD46 interaction triggers CD46 downregulation

• Published in: Journal of general virology Vol. 76; no. 11; pp. 2793 - 2800
• Main Authors: Krantic, Slavica, Gimenez, Cyrille, Rabourdin-Combe, Chantal
• Format: Journal Article
• Language: English
• Published: England Soc General Microbiol 01.11.1995
• Subjects: 1-Methyl-3-isobutylxanthine - pharmacology; Animals; Antibodies, Viral - metabolism; Antigens, CD - immunology; Antigens, CD - metabolism; Bucladesine - pharmacology; Cell Communication; Cell Line; Colforsin - pharmacology; Cyclic AMP-Dependent Protein Kinases - metabolism; Down-Regulation; Enzyme Activation; Hemagglutinins, Viral - immunology; Hemagglutinins, Viral - metabolism; Humans; measles virus; Measles virus - physiology; Membrane Cofactor Protein; Membrane Glycoproteins; Mice; Phosphodiesterase Inhibitors; Protein Kinase C - metabolism; Receptors, Virus - immunology; Receptors, Virus - metabolism; Tetradecanoylphorbol Acetate - analogs & derivatives; Tetradecanoylphorbol Acetate - pharmacology; Tumor Cells, Cultured
• ISSN: 0022-1317; 1465-2099
• DOI: 10.1099/0022-1317-76-11-2793

Laboratoire de Biologie Moléculaire et Cellulaire, UMR49, Ecole Normale Supérieure, 46 Allée d'Italie, 69634 Lyon, Cédex 07, France CD46 downregulation by measles virus (MV) occurs after expression of virus haemagglutinin (H) protein on the surface of the infected cell and is a consequence of CD46-H interaction on the cell membrane. To assess whether CD46 downregulation also occurs after CD46-H interaction when these two molecules are expressed on distinct cells, we used human T cell line Jurkat (expressing CD46) and transfected murine fibroblast line L stably expressing MV-H protein (L.H). FACS analysis shows that cell-to-cell contact of 1 h at 37 °C triggers a reduction of CD46 cell surface labelling as detected by MCI20.6, GB24 and J4-48 monoclonal antibodies. This reduction is similar to that observed after MV infection or after infection with recombinant vaccinia virus encoding MV-H protein. By contrast, MV-H protein was downregulated only when CD46-H interaction occurred on the same cell membrane. CD46 downregulation is specific for CD46-H interaction because it was not observed after coincubation of Jurkat cells with either L cells expressing MV nucleoprotein (L.NP) or L cells. Moreover, this downregulation could be blocked by either anti-CD46 or anti-H antibodies. The H-mediated CD46 downregulation is reversible and restricted to CD46 since expression of other surface markers (CD3, CD14, CD47 and CD63) is unaffected. It is apparently not mediated in a protein kinase (PK) A- or PKC-dependent manner. Altogether, our results provide an unequivocal demonstration that interaction between the extracellular domains of CD46 and MV-H is sufficient to trigger CD46 downregulation. * Author for correspondence. Fax +33 72 72 86 86. e-mail SKRANTIC@cri.ens-lyon.fr Received 28 February 1995; accepted 7 June 1995.