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Astragaloside IV attenuates complement membranous attack complex induced podocyte injury through the MAPK pathway

Rong Zheng1, Yueyi Deng, Yiping Chen

  • 1Department of Nephrology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 200032, China.

Phytotherapy Research : PTR
|November 17, 2011
PubMed

Insights

Astragalus membranaceus, a traditional Chinese medicine, may treat membranous nephropathy (MN) by protecting kidney podocytes. Its active compound, astragaloside IV (AS-IV), reduces podocyte injury and regulates key signaling pathways involved in MN.

Area of Science:

  • Nephrology
  • Immunology
  • Pharmacology

Background:

  • Membranous nephropathy (MN) is a leading cause of adult nephrotic syndrome, characterized by podocyte injury.
  • Astragalus membranaceus is traditionally used in China to treat MN, with documented benefits for proteinuria.
  • The precise mechanism by which Astragalus membranaceus alleviates MN remains unclear.

Purpose of the Study:

  • To investigate the therapeutic mechanism of Astragalus membranaceus in a podocyte injury model relevant to MN.
  • To elucidate how astragaloside IV (AS-IV), a key component, impacts podocyte damage and signaling pathways.

Main Methods:

  • Utilized a complement membranous attack complex-induced podocyte injury model.
  • Assessed lactate dehydrogenase (LDH) release as an indicator of cell damage.
  • Evaluated podocyte morphology, cytoskeleton integrity, and the phosphorylation status of JNK and ERK1/2.

Main Results:

  • Complement attack complex increased LDH release from podocytes; AS-IV inhibited this release dose-dependently.
  • AS-IV treatment restored podocyte morphology and reversed cytoskeleton damage.
  • AS-IV reduced the phosphorylation of JNK and ERK1/2 pathways induced by complement attack.

Conclusions:

  • Astragalus membranaceus may treat MN by protecting podocytes from injury.
  • The mechanism involves maintaining podocyte cytoskeleton integrity and modulating mitogen-activated protein kinase (MAPK) signaling.
  • AS-IV is a key active compound in Astragalus membranaceus responsible for these protective effects.

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