44 138

Cited 29 times in

Inorganic Arsenite Potentiates Vasoconstriction through Calcium Sensitization in Vascular Smooth Muscle

Authors
 Moo-Yeol Lee  ;  Young-Ho Lee  ;  Kyung-Min Lim  ;  Seung-Min Chung  ;  Ok-Nam Bae  ;  Heon Kim  ;  Choong-Ryeol Lee  ;  Jung-Duck Park  ;  Jin-Ho Chung 
Citation
 ENVIRONMENTAL HEALTH PERSPECTIVES, Vol.113(10) : 1330-1335, 2005 
Journal Title
 ENVIRONMENTAL HEALTH PERSPECTIVES 
ISSN
 0091-6765 
Issue Date
2005
MeSH
Animals ; Arsenites/pharmacology* ; Blood Pressure ; Calcium/metabolism* ; In Vitro Techniques ; Male ; Muscle, Smooth, Vascular/drug effects* ; Muscle, Smooth, Vascular/physiology ; Myosin Light Chains/metabolism ; Phenylephrine/pharmacology ; Phosphorylation ; Rats ; Rats, Sprague-Dawley ; Vasoconstriction/drug effects*
Keywords
arsenic ; arsenite ; blood vessels ; calcium sensitization ; cardiovascular disease ; myosin light chain phosphorylation ; vasoconstriction
Abstract
Chronic exposure to arsenic is well known as the cause of cardiovascular diseases such as hypertension. To investigate the effect of arsenic on blood vessels, we examined whether arsenic affected the contraction of aortic rings in an isolated organ bath system. Treatment with arsenite, a trivalent inorganic species, increased vasoconstriction induced by phenylephrine or serotonin in a concentration-dependent manner. Among the arsenic species tested—arsenite, pentavalent inorganic species (arsenate), monomethylarsonic acid (MMAV), and dimethylarsinic acid (DMAV)—arsenite was the most potent. Similar effects were also observed in aortic rings without endothelium, suggesting that vascular smooth muscle plays a key role in enhancing vasoconstriction induced by arsenite. This hypercontraction by arsenite was well correlated with the extent of myosin light chain (MLC) phosphorylation stimulated by phenylephrine. Direct Ca2+ measurement using fura-2 dye in aortic strips revealed that arsenite enhanced vasoconstriction induced by high K+ without concomitant increase in intracellular Ca2+ elevation, suggesting that, rather than direct Ca2+ elevation, Ca2+ sensitization may be a major contributor to the enhanced vasoconstriction by arsenite. Consistent with these in vitro results, 2-hr pretreatment of 1.0 mg/kg intravenous arsenite augmented phenylephrine-induced blood pressure increase in conscious rats. All these results suggest that arsenite increases agonist-induced vasoconstriction mediated by MLC phosphorylation in smooth muscles and that calcium sensitization is one of the key mechanisms for the hypercontraction induced by arsenite in blood vessels.
Files in This Item:
T200500447.pdf Download
DOI
10.1289/ehp.8000
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Lee, Young Ho(이영호) ORCID logo https://orcid.org/0000-0002-5749-1045
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/147667
사서에게 알리기
  feedback

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse