H-2-CONTROLLED, DOSE-DEPENDENT SUPPRESSION OF THE RESPONSE THAT EXPELS ADULT TRICHINELLA-SPIRALIS FROM THE SMALL-INTESTINE OF MICE

  • 1 January 1984
    • journal article
    • research article
    • Vol. 53  (4) , 811-818
Abstract
H-2 congenic strains of mice expressing the H-2k, H-2q or H-2f haplotype were tested for their ability to expel T. spiralis from the gut following infection with 100, 150, 200, 400, 500 or 600 L1 infective larvae. H-2q and H-2f mice expelled worms more quickly than H-2k mice when 100-200 L1 larvae were given, but this H-2-controlled effect was much reduced when mice received 400 L1 larvae, and completely eliminated when 500 or 600 L1 larvae were given. The observed dose-dependent delay in the expulsion response was paralleled by a concurrent suppression of lymphocyte responsiveness. Lymphocytes from H-2q mice infected with 100-200 L1 larvae incorporated more [3H]thymidine than did cells from H-2k mice. This H-2-controlled difference was not apparent in cells from mice receiving 400-600 L1 larvae. The strongest proliferation response in each case was associated with mice infected with the smallest number of worms. Since strains of mice expressing H-2-q or H-2-f alleles were suppressed at high doses to a much greater extent than were mice expressing H-2k, H-2 genes must influece this dose-dependent response. Many earlier studies which failed to demonstrate marked H-2 effects on immunity to T. spiralis employed infective doses which are shown here to be preferentially suppressive to otherwise resistant strains of mice.

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