Abstract:
:Changes in blood pressure and sympathetic nerve activity induced by local injection of endothelin-1 into the rostroventrolateral medulla were studied in narcotized stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive WKY rats. Endothelin-1 produced similar biphasic response in both rat strains: a transient increase in blood pressure and sympathetic nerve activity followed by progressive hypotension and bradycardia. Pretreatment with ETB-receptor antagonist BQ788 inhibited sympathetic activation induced by endothelin-1, while pretreatment with the ETA-receptor antagonist N-acetyl-[D-Trp16]-endothelin-1 abolished the subsequent hypotension. The antihypotensive effect of ETA-receptor blockade was most effective in normotensive rats. Our findings suggest that cardiovascular disorders in SHRSP rats can be related to peculiarities in the rostroventrolateral medullar endothelin system.
journal_name
Bull Exp Biol Medjournal_title
Bulletin of experimental biology and medicineauthors
Ponomareva TI,Khokhlova ON,Tukhovskaya EA,Murashov AMdoi
10.1023/a:1024172611834subject
Has Abstractpub_date
2003-03-01 00:00:00pages
237-40issue
3eissn
0007-4888issn
1573-8221journal_volume
135pub_type
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