title: B cell subsets contribute to renal injury and renal protection after ischemia/reperfusion.
abstract: Ischemia/reperfusion (I/R) triggers a robust inflammatory response within the kidney. Numerous components of the immune system contribute to the resultant renal injury, including the complement system. We sought to identify whether natural Abs bind to the postischemic kidney and contribute to complement activation after I/R. We depleted peritoneal B cells in mice by hypotonic shock. Depletion of the peritoneal B cells prevented the deposition of IgM within the glomeruli after renal I/R and attenuated renal injury after I/R. We found that glomerular IgM activates the classical pathway of complement, but it does not cause substantial deposition of C3 within the kidney. Furthermore, mice deficient in classical pathway proteins were not protected from injury, indicating that glomerular IgM does not cause injury through activation of the classical pathway. We also subjected mice deficient in all mature B cells (μMT mice) to renal I/R and found that they sustained worse renal injury than wild-type controls. Serum IL-10 levels were lower in the μMT mice. Taken together, these results indicate that natural Ab produced by peritoneal B cells binds within the glomerulus after renal I/R and contributes to functional renal injury. However, nonperitoneal B cells attenuate renal injury after I/R, possibly through the production of IL-10.
authors.affiliation: Department of Medicine, University of Colorado Denver School of Medicine, Denver, CO 80045, USA.
authors.forename: Brandon
authors.initials: B
authors.lastname: Renner
authors.forename: Derek
authors.initials: D
authors.lastname: Strassheim
authors.forename: Claudia R
authors.initials: CR
authors.lastname: Amura
authors.forename: Liudmila
authors.initials: L
authors.lastname: Kulik
authors.forename: Danica
authors.initials: D
authors.lastname: Ljubanovic
authors.forename: Magdalena J
authors.initials: MJ
authors.lastname: Glogowska
authors.forename: Kazue
authors.initials: K
authors.lastname: Takahashi
authors.forename: Michael C
authors.initials: MC
authors.lastname: Carroll
authors.forename: V Michael
authors.initials: VM
authors.lastname: Holers
authors.forename: Joshua M
authors.initials: JM
authors.lastname: Thurman
mesh_terms: D000818:Animals; D000917:Antibody Formation; D016175:B-Lymphocyte Subsets / Q000276:immunology*; D015153:Blotting, Western; D003167:Complement Activation / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D007075:Immunoglobulin M / Q000276:immunology; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D007668:Kidney / Q000276:immunology* / Q000293:injuries / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008856:Microscopy, Fluorescence; D015427:Reperfusion Injury / Q000276:immunology* / Q000473:pathology
chemical_list: D007075:Immunoglobulin M
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