Pesticide-containing diets augment anti-sheep red blood cell nonreaginic antibody responses in mice but may prolong murine infection with Giardia muris.
The effects of oral ingestion of different pesticides (lindane, phosalone, carbaryl) and of a polychlorinated biphenyl (pyralene) on nonreaginic antibody production in BALB/c mice and also on the duration of Giardia muris infection have been studied using the animal model of this disease. Only lindane and carbaryl produced significant effects on systemic antibody production following oral immunization with sheep red blood cells (SRBC). Lindane ingestion led to a twofold increase in IgG2b antibody titer to SRBC (P less than 0.05) and carbaryl significantly increased both IgG1 and IgG2b titers. No reduction was seen in the synthesis of any antibody class. The effect of feeding with lindane was to increase the duration of giardiasis significantly (P less than 0.002), and these mice developed systemic anti-Giardia antibodies more frequently than Giardia-infected mice on normal diets. These results suggest that in the doses used these pesticides may increase systemic antibody responses to orally ingested antigens, and by inference that spontaneous elimination of giardiasis is independent of the systemic nonreaginic antibody response to the parasite.
D000818:Animals; D000906:Antibodies / Q000032:analysis; D000917:Antibody Formation / Q000187:drug effects*; D004435:Eating; D004912:Erythrocytes / Q000276:immunology*; D005260:Female; D005872:Giardia / Q000276:immunology; D005873:Giardiasis / Q000175:diagnosis / Q000276:immunology*; D007136:Immunoglobulins / Q000096:biosynthesis; D007306:Insecticides / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D012756:Sheep
D000906:Antibodies; D007136:Immunoglobulins; D007306:Insecticides