Downregulation of adenosine and P2X receptor-mediated cardiovascular responses in heart failure rats.

Abstract:

:Neurohormonal changes in congestive heart failure (CHF) include an enhanced peripheral sympathetic nerve activity which results in increased release of noradrenaline, neuropeptide Y and ATP. To examine if such changes in CHF would modulate peripheral pre- and postsynaptic receptors of ATP and its degradation product adenosine, experiments were performed in a rat model of ischaemic CHF. In this model, ischaemia was induced in rats by ligation of the left coronary artery. Our results demonstrate that there is a selective downregulation of P2X receptor-mediated pressor effects, while the hypotensive effects mediated by the endothelial P2Y receptors are unaffected in CHF. Moreover, the adenosine-mediated inhibitory effects on heart rate and blood pressure were also attenuated in the CHF rats. The most important changes in adenosine and P2-receptor function induced by ischaemic CHF were the reduced pressor effect mediated by the P2X receptor and the increased heart rate due to an attenuated inhibitory effect of adenosine.

journal_name

Blood Press

journal_title

Blood pressure

authors

Zhao XH,Sun XY,Erlinge D,Edvinsson L,Hedner T

doi

10.1080/080370500453500

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

152-61

issue

2-3

eissn

0803-7051

issn

1651-1999

journal_volume

9

pub_type

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