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Either of two immunostimulating factors (lpr, lipopolysaccharide) enhanced the pathogenic autoimmune responses of MRL/n mice, but the serologic and immunopathologic characteristics differed. In contrast, either factor acting alone, caused minimal immunopathology in normal mice, despite autoantibody induction. Combined immunostimulation, however, caused fatal glomerulonephritis in normal-background C57BL/6 mice. These results show the profound influence of the background genome on the effects of immunostimulating agents, and show that resistance to autoimmune disease in immunologically normal mice is not absolute.
Hang et al. (Fri,) studied this question.