Decreased [3H]nitrendipine binding in the brainstem of deoxycorticosterone-NaCl hypertensive rats

Howard R. Lee, Mark Watson, Henry I. Yamamura, William R. Roeske

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Binding studies with the 1,4 dihydropyridine calcium channel antagonist [3H]nitrendipine ([3H]NTD) were performed in uninephrectomized, deoxycorticosterone (DOCA)-NaCl hypertensive rats and vehicle treated normotensive control littermates. After 6 weeks of treatment, hypertensive (199 mmHg, systolic arterial pressure) DOCA rats showed significantly increased heart, left ventricle, and kidney weight in contrast to normotensive (135 mmHg) controls. [3H]NTD binding in the brainstem was significantly reduced (51 ± 5 fmol/mg protein) in DOCA-NaCl rats, as compared to controls (116 ± 24 fmol/mg protein). However, no significant differences were found in the [3H]NTD dissociation constants for DOCA-NaCl (0.43 ± 0.03 nM) or control rats (0.62 ± 0.06 nM). Cerebral cortical and left ventricular tissue showed no significant alterations in receptor binding density or affinity. Specific [3H]NTD binding was not significantly altered in other selected brain regions or the atria. These data suggest that alterations in the dihydropyridine binding sites associated with calcium channels in the brainstem may be involved in the etiology of DOCA-NaCl-induced hypertension.

Original languageEnglish (US)
Pages (from-to)971-977
Number of pages7
JournalLife Sciences
Volume37
Issue number10
DOIs
StatePublished - Sep 9 1985
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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