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Cathepsin L expression and regulation in human abdominal aortic aneurysm, atherosclerosis, and vascular cells.

Abstract：

:The cysteine protease cathepsin L is one of the most potent mammalian elastases and collagenases, widely expressed at basal levels in most tested tissues and cell types, and regulated by pro-inflammatory stimuli. The inflammatory arterial diseases abdominal aortic aneurysm (AAA) and atherosclerosis involve extensive vascular remodeling that requires elastolysis and collagenolysis. This study examined the hypothesis that cathepsin L is over-expressed in human AAA and atherosclerotic lesions and its expression in vascular cell types found in these lesions is regulated by pro-inflammatory cytokines. Immunohistochemical and tissue extract immunoblot analysis demonstrated increased expression of cathepsin L in human AAA and atheromata and localized its expression to lesional smooth muscle cells (SMC), endothelial cells (EC), and macrophages. In primary cultured human SMC, EC, and monocyte-derived macrophages, pro-inflammatory cytokines or growth factors induced the expression of cathepsin L and its activity against extracellular collagen and elastin. Patients with coronary artery stenosis (n=65) had higher serum cathepsin L levels than those without lesions detectable by quantitative coronary angiography (n=30) (1.47+/-0.33 ng/ml versus 0.60+/-0.06 ng/ml, p<0.02). A strong correlation between the percent of stenosis of left anterior descending coronary artery and serum cathepsin L levels in patients with stenosis (R=0.542, p<0.0001), also suggests involvement of cathepsin L in these vascular diseases.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Liu J,Sukhova GK,Yang JT,Sun J,Ma L,Ren A,Xu WH,Fu H,Dolganov GM,Hu C,Libby P,Shi GP

doi

10.1016/j.atherosclerosis.2005.05.012

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

302-11

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(05)00311-4

journal_volume

184

pub_type

杂志文章

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