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

Xin Zhao, X Y Sun, D Erlinge, L Edvinsson, T Hedner

9 Citationer (Scopus)

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.

OriginalsprogEngelsk
TidsskriftBlood Pressure
Vol/bind9
Udgave nummer2-3
Sider (fra-til)152-61
Antal sider10
ISSN0803-7051
StatusUdgivet - 2000
Udgivet eksterntJa

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