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Experimental allergic orchitis in mice. V. Resistance to actively induced disease in BALB/cJ substrain mice is mediated by CD4+ T cells



Experimental allergic orchitis in mice. V. Resistance to actively induced disease in BALB/cJ substrain mice is mediated by CD4+ T cells



Immunogenetics 32(1): 34-40



Previous studies have shown that differential susceptibility to actively induced experimental allergic orchitis (EAO) exists among various BALB/c substrains. Of 13 substrains studied, BALB/cJ mice consistently exhibit greater resistance to disease induction. Such resistance is associated with a single recessive genotypic difference in an immunoregulatory locus which is unlinked to any of the known alleles distinguishing the BALB/cJ substrain. In this study, gene complementation protocols were used to study the genetics of susceptibility and resistance to EAO. The results indicate that resistance in BALB/cJ mice is not due to a mutation in the H-2Dd linked gene which governs the phenotypic expression of autoimmune orchitis. The mechanistic basis for disease resistance was examined using reciprocal bone marrow radiation chimeras generated between the disease-susceptible BALB/cByJ (ByJ) substrain and BALB/cJ (Jax) mice. All constructs, including Jax----Jax and Jax----ByJ, developed severe EAO following inoculation with mouse testicular homogenate (MTH) and adjuvants whereas control chimeras immunized with adjuvants alone did not. These results suggest that an active immunoregulatory mechanism rather than a passive one, such as the lack of T cells and/or B cells with receptors for the aspermatogenic autoantigens relevant in the induction of EAO, is responsible for disease resistance in BALB/cJ mice. The role of immunoregulatory cells was examined by pretreating BALB/cJ mice with either cyclophosphamide (20 mg/kg) or low-dose whole body or total lymphoid irradiation (350 rads) 2 days prior to inoculation. BALB/cJ mice immunized with MTH plus adjuvants generate immunoregulatory spleen cells (SpCs) that, when transferred to naive BALB/cByJ recipients, significantly reduce the severity of autoimmune orchitis observed during actively induced EAO. Treatment of such cells with either cytotoxic monoclonal anti-Thy-1.2 or anti-CD4 plus C' before transfer abrogates the ability of BALB/cJ spleen cells to inhibit disease. In contrast, neither SpCs from adjuvant-immunized BALB/cJ nor MTH plus adjuvant-primed BALB/cByJ donors significantly influenced the severity of disease observed in recipients. Taken together, these results suggest that genetically controlled resistance to EAO in BALB/cJ mice is associated with a mutation in an immunoregulatory locus whose effects appear to be mediated through a cyclophosphamide and low-dose radiation-sensitive CD4+ T-cell population.

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Accession: 001831627

Download citation: RISBibTeXText

PMID: 1973683

DOI: 10.1007/bf01787326


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