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Paradoxical effect of L-arginine: acceleration of endothelial cell senescence.

Abstract：

:We have recently shown that inhibition of nitric oxide (NO) synthesis by asymmetrical dimethylarginine (ADMA) accelerated endothelial cell (EC) senescence which was prevented by coincubation with L-arginine; however the effect of long-term treatment of l-arginine alone on senescence of ECs have not been investigated. Human ECs were cultured in medium containing different concentrations of L-arginine until senescence. L-Arginine paradoxically accelerated senescence indicated by inhibiting telomerase activity. Moreover, L-arginine decreased NO metabolites, increased peroxynitrite, and 8-iso-prostaglandin F(2alpha) formation. In old cells, the mRNA expression of human amino acid transporter (hCAT)2B, the activity and protein expression of arginase II were upregulated indicated by enhanced urea, L-ornithine, and L-arginine consumption. Inhibition of arginase activity, or transfection with arginase II siRNA prevented L-arginine-accelerated senescence. The most possible explanation for the paradoxical acceleration of senescence by L-arginine so far may be the translational and posttranslational activation of arginase II.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Scalera F,Closs EI,Flick E,Martens-Lobenhoffer J,Boissel JP,Lendeckel U,Heimburg A,Bode-Böger SM

doi

10.1016/j.bbrc.2009.06.091

subject

Has Abstract

pub_date

2009-09-04 00:00:00

pages

650-5

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(09)01237-6

journal_volume

386

pub_type

杂志文章

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