Impairment of T-helper function by a Plasmodium berghei-derived immunosuppressive factor.
Mice injected with an immunosuppressive factor (ISF) extracted from Plasmodium berghei-infected rat erythrocytes have a reduced antibody response to unrelated antigens. T-cells from ISF-treated mice failed to provide adequate help to naive, syngeneic B-cells in the primary IgM response in vitro to sheep red blood cells and to dinitrophenylated keyhole limpet hemocyanin. The same T-cells, however, were able to cooperate with memory B-cells in the secondary IgG response. No other cellular deficit was detected in ISF-treated mice; B-cells and macrophages behaved normally, and there was no detectable excess of suppressor cells. The T-cell impairment was not reflected in decreased production of interleukin 2, but was also shown by the diminished delayed type hypersensitivity reaction to sheep red blood cells of ISF-treated mice.
Srour
E F
EF
Department of Veterinary Pathobiology, University of Illinois, Urbana 61801.
Segre
M
M
Segre
D
D
D000818:Animals; D002457:Cell Extracts / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004912:Erythrocytes / Q000032:analysis; D005260:Female; D006967:Hypersensitivity / Q000276:immunology; D007108:Immune Tolerance; D007376:Interleukin-2 / Q000096:biosynthesis; D008288:Malaria / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010962:Plasmodium berghei; D051381:Rats; D011919:Rats, Inbred Strains; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
D002457:Cell Extracts; D007376:Interleukin-2