Evidence for Nonadrenoceptor Responses to Imidazoline Derivatives in the Porcine Isolated Rectal Artery

Minyan Wang, W. R. Dunn, S. L. Chan, B. Garfield, V. G. Wilson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


High concentrations of phentolamine, efaroxan, and idazoxan were found to produce nonadrenoceptor contractions of the porcine isolated rectal artery previously exposed to U46619 and forskolin. These responses were insensitive to the putative imidazoline I3 receptor antagonist KU-14R, unlike those previously reported in this preparation for oxymetazoline. The pharmacologic nature of this response and the obligate requirement for preconstriction suggests that these imidazoline derivatives modulate ion channel function through a novel nonadrenergic site.

Original languageEnglish
Pages (from-to)386-391
Number of pages6
JournalAnnals of the New York Academy of Sciences
Publication statusPublished - 2003
Externally publishedYes


  • Idazoxan
  • Imidazolines
  • KU-14R
  • Non-adrenoceptors
  • Phentolamine

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