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MafB is a critical regulator of complement component C1q.

Mai Thi Nhu Tran1, Michito Hamada2,3, Hyojung Jeon1

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|November 24, 2017
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Summary

The transcription factor MafB regulates efferocytosis by macrophages, crucial for preventing autoimmune diseases. MafB deficiency impairs efferocytosis by reducing C1q complement protein, increasing autoimmune risks.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Macrophages play a key role in preventing autoimmune diseases through efferocytosis (apoptotic cell clearance).
  • The transcription factor MafB is expressed in monocytes and macrophages, and its deficiency impairs efferocytosis.

Purpose of the Study:

  • To investigate the role of MafB in regulating efferocytosis and its connection to the complement system.
  • To determine if MafB influences the expression of C1q, a key component of the classical complement pathway.

Main Methods:

  • Assessing efferocytosis in Mafb-deficient macrophages.
  • Measuring C1q protein levels and classical complement pathway activation via hemolysis assays.
  • Analyzing gene expression related to C1q.
  • Evaluating glomerular autoimmunity in Mafb-deficient mice.

Main Results:

  • MafB deficiency significantly reduces efferocytosis by macrophages.
  • C1q expression and classical complement pathway activation are decreased in Mafb-deficient macrophages and mice.
  • Restoring serum from wild-type but not C1q-deficient mice rescued the efferocytosis defect.
  • MafB deficiency exacerbates glomerular autoimmunity and anti-nuclear antibody deposition.

Conclusions:

  • MafB is a critical regulator of C1q expression and function.
  • MafB-mediated regulation of C1q is essential for effective efferocytosis and preventing autoimmune disease development.