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The Expression Profile of Complement Components in Podocytes.

Xuejuan Li1, Fangrui Ding2, Xiaoyan Zhang3

  • 1Department of Pediatrics, Peking University First Hospital, Beijing 100034, China. clairesnow@126.com.

International Journal of Molecular Sciences
|April 5, 2016
PubMed
Summary
This summary is machine-generated.

Podocytes synthesize numerous complement components at the mRNA and protein levels. These complement gene expressions are altered by podocyte injury factors, impacting kidney disease.

Keywords:
complement expressionpodocytepodocyte injury

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Area of Science:

  • Nephrology
  • Immunology
  • Molecular Biology

Background:

  • Podocytes are crucial for the glomerular filtration barrier and are implicated in proteinuric kidney diseases.
  • Emerging evidence suggests podocytes synthesize complement components involved in glomerular disease pathogenesis.
  • The precise profile and extent of complement expression in podocytes are not well-defined.

Purpose of the Study:

  • To comprehensively examine the complement expression profile in podocytes under both physiological and injury-induced conditions.
  • To identify specific complement factors synthesized by podocytes.
  • To investigate how podocyte injury stimuli affect complement gene expression.

Main Methods:

  • Conventional RT-PCR was used to screen for complement component expression in podocytes.
  • Tandem mass spectrometry confirmed the presence of specific complement proteins (C3, Crry, C1q-binding protein).
  • Fluorescence confocal microscopy visualized representative complement components.
  • Primary cultured and immortalized podocytes were treated with injury factors like puromycin aminonucleoside (PAN), angiotensin II (Ang II), interleukin-6 (IL-6), and transforming growth factor-β (TGF-β).

Main Results:

  • Out of 32 complement components, 23 were detected in podocytes via RT-PCR.
  • Seventeen specific complement factors (including C1q, C3, and Crry) were consistently expressed in both primary and immortalized podocytes.
  • Nine complement factors (including C4, C5, and C9) were not detected.
  • Podocyte complement gene expression levels were significantly modulated by PAN, Ang II, IL-6, and TGF-β treatments.
  • Key complement components like C3 and Crry were validated at the protein level.

Conclusions:

  • Primary podocytes express a wide array of complement components at both mRNA and protein levels.
  • Podocyte complement expression is dynamic and responsive to various injury-inducing stimuli.
  • These findings highlight the intrinsic role of podocytes in the renal complement system and their potential contribution to glomerular diseases.