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KMUP-1 regulates the vascular calcification in chronic renal failure by mediating NO/cGMP/PKG signaling pathway

Lian-Sheng Ren1, Lei Zhang1, Dan Zhu1

  • 1Department of Nephrology, The First Affiliated Hospital of Harbin Medical University, Harbin 150001, China.

Life Sciences
|April 22, 2020
PubMed
Abstract

Insights

KMUP-1 treatment improved chronic renal failure (CRF) and vascular calcification in rats by activating the nitric oxide (NO)/cyclic guanosine monophosphate (cGMP)/protein kinase G (PKG) pathway. This study offers new therapeutic insights for CRF complications.

Area of Science:

  • Nephrology
  • Cardiovascular Biology
  • Pharmacology

Background:

  • Chronic renal failure (CRF) is associated with significant vascular complications, including calcification.
  • Vascular calcification in CRF contributes to cardiovascular morbidity and mortality.
  • The nitric oxide (NO)/cyclic guanosine monophosphate (cGMP)/protein kinase G (PKG) pathway plays a crucial role in vascular homeostasis.

Purpose of the Study:

  • To investigate the therapeutic potential of KMUP-1 in mitigating vascular calcification in CRF.
  • To elucidate the underlying mechanism of KMUP-1's action, focusing on the NO/cGMP/PKG pathway.
  • To provide novel therapeutic strategies for managing CRF and its vascular sequelae.

Main Methods:

  • CRF was induced in rats, followed by treatment with KMUP-1, with or without L-NNA (a nitric oxide synthase inhibitor).
  • Vascular calcification was assessed using Alizarin red and Von Kossa staining.
  • Vascular smooth muscle cells (VSMCs) were used for in vitro validation of KMUP-1's effects on calcification via the NO/cGMP/PKG pathway.
  • Protein and mRNA expression levels were analyzed using Western blotting and qRT-PCR, respectively.

Main Results:

  • CRF rats exhibited elevated markers of renal dysfunction, inflammation, and vascular calcification, including increased calcium content and alkaline phosphatase (ALP) levels.
  • KMUP-1 treatment significantly improved renal function and attenuated vascular calcification in CRF rats.
  • KMUP-1 activated the NO/cGMP/PKG pathway, evidenced by increased eNOS and PKG expression and normalized NOx and cGMP levels.
  • In vitro studies confirmed KMUP-1's ability to reduce calcification in VSMCs, an effect antagonized by L-NNA.

Conclusions:

  • KMUP-1 demonstrates significant therapeutic efficacy in improving renal function and reducing vascular calcification in a rat model of CRF.
  • The beneficial effects of KMUP-1 are mediated, at least in part, by the activation of the NO/cGMP/PKG signaling pathway.
  • These findings highlight KMUP-1 as a promising therapeutic agent for managing vascular calcification in patients with chronic renal failure.
Keywords:
Chronic renal failureKMUP-1PathwayVascular calcification

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