title: gp140, the C3d receptor of human B lymphocytes, is also the Epstein-Barr virus receptor.
abstract: The relationship between gp140, the membrane C3d receptor (CR2) of human B lymphocytes, and the Epstein-Barr virus receptor (EBVR) was analyzed by using the polyclonal anti-gp140, previously prepared by immunizing rabbits with highly purified gp140 (isolated by some of us) from CR2/EBVR-positive Raji cells. Polyclonal anti-gp72, a C3-binding membrane component, not related to the EBVR but also expressed on the Raji cell surface, was used as a control. Binding of rabbit IgG and EBV on cells was assessed by using immunofluorescence techniques with analysis by flow cytofluorometry. A semiquantitative bioassay was also used to measure the EBV binding. Polyclonal monospecific anti-gp140 IgG inhibits directly the binding of EBV to Raji cells at the same concentration that inhibits the binding of EC3d on cells, whereas a 35 times higher concentration of anti-gp72 IgG or preimmune serum IgG does not. Anti-gp140 IgG treatment also inhibits the induction of EBV-determined nuclear antigen in normal tonsil B lymphocytes or in EBV-negative Ramos cells, whereas high concentrations of anti-gp72 IgG or preimmune serum IgG have no effect. These data strongly suggest that gp140, the CR2 of human B lymphocytes, is also the EBVR.
authors.forename: R
authors.initials: R
authors.lastname: Frade
authors.forename: M
authors.initials: M
authors.lastname: Barel
authors.forename: B
authors.initials: B
authors.lastname: Ehlin-Henriksson
authors.forename: G
authors.initials: G
authors.lastname: Klein
mesh_terms: D001402:B-Lymphocytes / Q000378:metabolism*; D002472:Cell Transformation, Viral; D003176:Complement C3 / Q000378:metabolism; D015933:Complement C3d; D006023:Glycoproteins / Q000378:metabolism; D004854:Herpesvirus 4, Human; D006801:Humans; D007158:Immunologic Techniques; D008970:Molecular Weight; D011951:Receptors, Complement / Q000276:immunology; D017464:Receptors, Complement 3d; D011991:Receptors, Virus / Q000276:immunology
chemical_list: D003176:Complement C3; D006023:Glycoproteins; D011951:Receptors, Complement; D017464:Receptors, Complement 3d; D011991:Receptors, Virus; D015933:Complement C3d