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* Department of Cellular Injury, Walter Reed Army Institute of Research, Silver Spring, MD 20910;
Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814;
Beltsville Human Nutrition Research Center, U.S. Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center-East, Nutrient Functions and Requirements Laboratory, Beltsville, MD 20705;
Departments of Medicine and Immunology, University of Colorado Health Science Center, Denver, CO 80262; and
¶ Department of Pathology, University of Iowa College of Medicine, Iowa City, IA 52242
Intestinal ischemia-reperfusion (IR) injury is initiated when natural Abs recognize neoantigens that are revealed on ischemic cells. Cr2-/- mice, deficient in complement receptors (CR)1 and CR2, demonstrate defects in T-dependent B-2 B cell responses to foreign Ags and have also been suggested to manifest abnormalities of the B-1 subset of B lymphocytes. To determine whether these CRs might play a role in the generation of the natural Abs that initiate intestinal IR injury, we performed experiments in Cr2-/- and control Cr2+/+ mice. We found that Cr2-/- mice did not demonstrate severe intestinal injury that was readily observed in control Cr2+/+ mice following IR, despite having identical serum levels of IgM and IgG. Pretreatment of Cr2-/- mice before the ischemic phase with IgM and IgG purified from the serum of wild-type C57BL/6 mice reconstituted all key features of IR injury, demonstrating that the defect involves the failure to develop this subset of natural Abs. Pretreatment with IgM and IgG individually demonstrates that each contributes to unique features of IR injury. In sum, CR2/CR1 play an unanticipated but critical role in the development of a subset of the natural Ab repertoire that has particular importance in the pathogenesis of IR injury.
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