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Br J Pharmacol. 2018 Apr;175(8):1157-1172. doi: 10.1111/bph.13920. Epub 2017 Aug 11.

l-Homocysteine-induced cathepsin V mediates the vascular endothelial inflammation in hyperhomocysteinaemia.

Leng YP1,2, Ma YS2,3, Li XG2,3, Chen RF2,4, Zeng PY2,4, Li XH1,2, Qiu CF1,2, Li YP2,3, Zhang Z2,4, Chen AF1,2.

Author information

1
Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China.
2
Center for Vascular Disease and Translational Medicine, The Third Xiangya Hospital of Central South University, Changsha, China.
3
Department of Cardiology, The Third Xiangya Hospital of Central South University, Changsha, China.
4
Centre for Experimental Medicine, The Third Xiangya Hospital of Central South University, Changsha, China.

Abstract

BACKGROUND AND PURPOSE:

Vascular inflammation, including the expression of inflammatory cytokines in endothelial cells, plays a critical role in hyperhomocysteinaemia-associated vascular diseases. Cathepsin V, specifically expressed in humans, is involved in vascular diseases through its elastolytic and collagenolytic activities. The aim of this study was to determine the effects of cathepsin V on l-homocysteine-induced vascular inflammation.

EXPERIMENTAL APPROACH:

A high methionine diet-induced hyperhomocysteinaemic mouse model was used to assess cathepsin V expression and vascular inflammation. Cultures of HUVECs were challenged with l-homocysteine and the cathepsin L/V inhibitor SID to assess the pro-inflammatory effects of cathepsin V. Transfection and antisense techniques were utilized to investigate the effects of cathepsin V on the dual-specificity protein phosphatases (DUSPs) and MAPK pathways.

KEY RESULTS:

Cathepsin L (human cathepsin V homologous) was increased in the thoracic aorta endothelial cells of hyperhomocysteinaemic mice; l-homocysteine promoted cathepsin V expression in HUVECs. SID suppressed the activity of cathepsin V and reversed the up-regulation of inflammatory cytokines (IL-6, IL-8 and TNF-α), adhesion and chemotaxis of leukocytes and vascular inflammation induced by l-homocysteine in vivo and in vitro. Increased cathepsin V promoted the degradation of DUSP6 and DUSP7, phosphorylation and subsequent nuclear translocation of ERK1/2, phosphorylation of STAT1 and expression of IL-6, IL-8 and TNF-α.

CONCLUSIONS AND IMPLICATIONS:

This study has identified a novel mechanism, which shows that l-homocysteine-induced upregulation of cathepsin V mediates vascular endothelial inflammation under high homocysteine condition partly via ERK1/2 /STAT1 pathway. This mechanism could represent a potential therapeutic target in hyperaemia-associated vascular diseases.

LINKED ARTICLES:

This article is part of a themed section on Spotlight on Small Molecules in Cardiovascular Diseases. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.8/issuetoc.

PMID:
28631302
PMCID:
PMC5866977
DOI:
10.1111/bph.13920
[Indexed for MEDLINE]
Free PMC Article

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