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Related Concept Videos

Hypersensitivity Reactions: Immune-Complex Reactions01:19

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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

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Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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CD11b is protective in complement-mediated immune complex glomerulonephritis.

Jessy J Alexander1, Lee D Chaves1, Anthony Chang2

  • 1Division of Nephrology, Department of Medicine, Clinical and Translational Research Center, University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York, USA.

Kidney International
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Summary
This summary is machine-generated.

Complement factor H absence exacerbates immune complex glomerulonephritis. Mononuclear cell CD11b is crucial for anti-inflammatory responses in inflamed kidneys, mitigating disease severity.

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Area of Science:

  • Immunology
  • Nephrology
  • Molecular Biology

Background:

  • Immune complex deposition in glomeruli can cause kidney disease.
  • Complement factor H (CfH) plays a role in regulating complement activation and preventing glomerulonephritis.
  • Leukocyte receptors like complement receptor 3 (CD11b) and Fcγ receptors can interact with immune complexes.

Purpose of the Study:

  • To investigate the role of complement factor H and leukocyte receptors in immune complex-mediated glomerulonephritis.
  • To determine the specific contribution of CD11b on mononuclear cells in the development of kidney inflammation.
  • To understand the cellular mechanisms underlying renal functional insufficiency in this disease model.

Main Methods:

  • Induction of immune complex-mediated glomerulonephritis in complement factor H-deficient mice.
  • Generation of chimeric mice with bone marrow stem cells lacking specific genes (wild-type, CfH(-/-), CD11b(-/-), FcRγ(-/-)).
  • Assessment of glomerulonephritis severity, immune responses, glomerular deposits, interstitial inflammation, macrophage polarization, T cell infiltration, and renal function.

Main Results:

  • Glomerulonephritis was significantly worse in CD11b(-/-) bone marrow chimeras compared to other groups.
  • Disease severity correlated with humoral immune responses and interstitial inflammation, particularly M1 macrophage accumulation.
  • CD11b(-/-) chimeras exhibited increased M1 macrophages and CD4(+) T cells in the kidneys.
  • CD11b(+) cells expressing colony-stimulating factor 1 receptor showed a negative correlation with glomerulonephritis scores.

Conclusions:

  • CD11b on mononuclear cells is essential for an anti-inflammatory response within the inflamed kidney.
  • The absence of CD11b exacerbates immune complex-mediated glomerulonephritis by promoting M1 macrophage and CD4(+) T cell accumulation.
  • These findings highlight CD11b as a potential therapeutic target for inflammatory kidney diseases.