Impairment of tetanus toxoid-specific Th1-like immune responses in humans infected with Schistosoma mansoni.
After vaccination with tetanus toxoid (TT), TT-specific immune responses in humans infected with Schistosoma mansoni were assessed. Peripheral blood mononuclear cells (PBMC) from vaccinated infected subjects and vaccinated uninfected controls were evaluated for their ability to produce cytokines characteristic of Th1 or Th2 cells (interferon [IFN]-gamma or interleukin [IL]-4, respectively) after in vitro restimulation with TT. TT-specific IFN-gamma production by PBMC from infected subjects was inversely related to infection intensity and was significantly lower than TT-specific IFN-gamma production by control PBMC. PBMC from all of the infected subjects and 3 of the 5 controls analyzed by reverse transcriptase-polymerase chain reaction transcribed the IL-4 gene in response to TT restimulation. Together, these results suggest that S. mansoni-infected persons mount a Th2-like response to the bystander antigen TT, while uninfected persons mount a Th1- or Th0-like response.
Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853-6401, USA.
E A
EA
Sabin
M I
MI
Araujo
E M
EM
Carvalho
E J
EJ
Pearce
D000293:Adolescent; D000328:Adult; D000818:Animals; D002478:Cells, Cultured; D002648:Child; D004587:Electrophoresis, Agar Gel; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012550:Schistosoma mansoni / Q000276:immunology; D012555:Schistosomiasis mansoni / Q000276:immunology*; D013742:Tetanus / Q000517:prevention & control; D013745:Tetanus Toxoid / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology; D014611:Vaccination
D013745:Tetanus Toxoid; D015847:Interleukin-4; D007371:Interferon-gamma