Structure-activity studies with ring E analogues of methyllycaconitine on bovine adrenal α3β4* nicotinic receptors

Darrell L. Bryant, R. Benjamin Free, Sara M Thomasy, David J. Lapinsky, Khadiga A. Ismail, Susan B. McKay, Stephen C. Bergmeier, Dennis B. McKay

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The development of new agents that selectively interact with subtypes of neuronal nicotinic receptors (nAChRs) is of primary importance for the study of physiological processes and pathophysiological conditions involving these receptors. Our laboratory has evidence that simple ring E analogues of methyllycaconitine (MLA) act as antagonists to bovine adrenal α3β4* nAChRs. The following studies were designed to characterize the concentration-response effects of several ring E analogues of MLA in order to assess structural requirements involved with their inhibitory activity on bovine adrenal α3β4* nAChRs. Ring E analogues with various substitutions on the ring E nitrogen were tested for their ability to inhibit nicotinic stimulated adrenal catecholamine release and [3H]epibatidine binding to a bovine adrenal membrane preparation. Several N-alkyl derivatives inhibited secretion with IC50 values in the low micromolar range. The N-phenpropyl analogue was the most potent of the analogues tested (IC50, 11 μM) on adrenal secretion. Competition binding studies suggest a noncompetitive interaction of the analogues with bovine adrenal nAChRs. These studies identify several structural features of ring E analogues of MLA which significantly affect their inhibitory activity on bovine adrenal α3β4* nAChRs.

Original languageEnglish (US)
Pages (from-to)57-63
Number of pages7
JournalNeuroscience Research
Volume42
Issue number1
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Nicotinic Receptors
epibatidine
Inhibitory Concentration 50
Physiological Phenomena
Catecholamines
Nitrogen
methyllycaconitine
Membranes

Keywords

  • Adrenal catecholamine secretion
  • Binding
  • Methyllycaconitine
  • MLA
  • Nicotinic receptor

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Structure-activity studies with ring E analogues of methyllycaconitine on bovine adrenal α3β4* nicotinic receptors. / Bryant, Darrell L.; Free, R. Benjamin; Thomasy, Sara M; Lapinsky, David J.; Ismail, Khadiga A.; McKay, Susan B.; Bergmeier, Stephen C.; McKay, Dennis B.

In: Neuroscience Research, Vol. 42, No. 1, 2002, p. 57-63.

Research output: Contribution to journalArticle

Bryant, Darrell L. ; Free, R. Benjamin ; Thomasy, Sara M ; Lapinsky, David J. ; Ismail, Khadiga A. ; McKay, Susan B. ; Bergmeier, Stephen C. ; McKay, Dennis B. / Structure-activity studies with ring E analogues of methyllycaconitine on bovine adrenal α3β4* nicotinic receptors. In: Neuroscience Research. 2002 ; Vol. 42, No. 1. pp. 57-63.
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