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 Pressjournal_title
Blood pressureauthors
Zhao XH,Sun XY,Erlinge D,Edvinsson L,Hedner Tdoi
10.1080/080370500453500subject
Has Abstractpub_date
2000-01-01 00:00:00pages
152-61issue
2-3eissn
0803-7051issn
1651-1999journal_volume
9pub_type
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