Cyclooxygenase-1 inhibition corrects endothelial dysfunction in cirrhotic rat livers.

Abstract:

BACKGROUND/AIMS:Cirrhotic livers exhibit endothelial dysfunction that contributes to the increased hepatic vascular resistance. The present study evaluates the role of cyclooxygenase (COX)-derived prostanoids, implicated in the pathogenesis of endothelial dysfunction in other settings, in the pathogenesis of endothelial dysfunction in cirrhotic livers. METHODS:Endothelial dysfunction was evaluated by performing concentration-effect curves to acetylcholine after precontracting the liver with methoxamine in groups of control and CCl(4)-cirrhotic rat livers preincubated either with vehicle, indomethacin, the COX-1 selective inhibitor, SC-560, the COX-2 selective inhibitor, SC-236, the thromboxane A(2) receptor antagonist, SQ 29,548 or the nitric oxide (NO) synthase inhibitor N(G)-nitro-L-arginine. Thromboxane A(2) (TXA(2)) production was determined in samples of the perfusate. RESULTS:Cirrhotic livers exhibited endothelial dysfunction, as shown by the significantly lower relaxation to acetylcholine than control livers, that was totally corrected by indomethacin. COX-1 inhibition and TXA(2) blockade, but not COX-2 inhibition, also corrected endothelial dysfunction. Acetylcholine significantly increased TXA(2) production in cirrhotic but not in control livers. Indomethacin and COX-1 inhibition, but not COX-2 or NO inhibition, prevented the increased production of TXA(2). CONCLUSIONS:An increased production of TXA(2) is involved in the pathogenesis of endothelial dysfunction in cirrhotic rat livers. This is mainly mediated by COX-1, but not by COX-2.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Graupera M,García-Pagán JC,Parés M,Abraldes JG,Roselló J,Bosch J,Rodés J

doi

10.1016/s0168-8278(03)00347-7

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

515-21

issue

4

eissn

0168-8278

issn

1600-0641

pii

S0168827803003477

journal_volume

39

pub_type

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