Accelerated calcification represses the expression of elastic fiber components and lysyl oxidase in cultured bovine aortic smooth muscle cells.

Abstract:

:Vascular calcification is a common feature of advanced atherosclerosis resulting in reduced elasticity of elastic arteries. However, the relationship between elastic fibers and vascular calcification at the molecular and cellular levels remains unknown. We investigated the expression of major elastic fiber components such as tropoelastin (TE) and fibrillin-1 (FBN1) and elastin-related enzyme, lysyl oxidase (LO), in a calcification model using beta-glycerophosphate (beta-GP) in cultured bovine aortic smooth muscle cells (BASMCs). Ten mM of beta-GP stimulated calcium deposition in a time-dependent manner. As determined by Western blot analysis, 10 mM of beta-GP time-dependently decreased TE and FBN1 protein levels. TE, FBN1, and LO mRNA levels, assessed by reverse transcription-polymerase chain reaction, were also decreased by exposure to 10 mM beta-GP. Furthermore, we investigated whether the processes of calcification in BASMCs directly control these regulations. In experiments using levamisole, an alkaline phosphatase inhibitor, and DMDP, a bisphosphonate, both inhibitors inhibited down-regulation during beta-GP-induced calcification, suggesting that the down-regulation of TE, FBN1, and LO directly relates to calcium deposition. In cases of vascular calcification, the decreased expression of TE, FBN1, and LO may be partially responsible for decreased vascular elasticity and also for the decreased formation of new elastic fibers.

journal_name

J Atheroscler Thromb

authors

Sugitani H,Wachi H,Mecham RP,Seyama Y

doi

10.5551/jat.9.292

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

292-8

issue

6

eissn

1340-3478

issn

1880-3873

journal_volume

9

pub_type

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