Secretion of suppressor factors by EBV infected B cell lines.
The infection of human peripheral blood B cells with Epstein-Barr Virus (EBV), induced the production of suppressor factor(s) which were released into the supernatant of the B-cell cultures. The induction of suppressive activity was independent of T-cell presence. The suppression was exhibited both against T-cell activity (MLR and mitogenic stimulation) as well as against B-cell mitogenic stimulation of human or murine B lymphocytes. The suppressive factor(s) was of a low molecular weight (equal or less than 5,000), resistant to trypsin and heating at 80 degrees C and its activity was partially inhibited by neuraminidase treatment. These findings indicate that the suppressive factor(s) is not correlated to immunoglobulin production, is not apparently of a protein nature, and might be of ganglioside or siaylated glycoprotein structure. Our present findings suggest that, in addition to T cells, B cells might also play an immunoregulatory role in the expression of immune response potential.
Drucker
I
I
Laboratory of Clinical Immunology, Meir Hospital, Kfar Saba, Israel.
Ben-Efraim
S
S
Klajman
A
A
D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism / Q000821:virology; D004854:Herpesvirus 4, Human; D006801:Humans; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D013491:Suppressor Factors, Immunologic / Q000737:chemistry / Q000378:metabolism*
D013491:Suppressor Factors, Immunologic