p-fluoro-hexahydro-sila-difenidol exhibits poor selectivity between m3 and m1 muscarinic receptors

Yuqing Meng, Jingru Hu, Esam E. El-Fakahany

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We investigated the potential ability of p-fluoro-hexahydro-sila-difenidol (p-F-HHSiD) to discriminate between M1 and M3 muscarinic receptor subtypes using Chinese hamster ovary cells stably transfected with the genes encoding the two receptors. Both radioligand binding and functional assays were utilized for this purpose. In contrast to initial reports of a 14-fold selectivity of this antagonist for M3 versus M1 receptors, we have detected a qualitatively similar selectivity that was markedly smaller in magnitude.

Original languageEnglish (US)
Pages (from-to)293-300
Number of pages8
JournalMolecular Membrane Biology
Issue number4
StatePublished - 1990
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported in part by a grant NS-25743 from the National Institutes of Health and contract DAAL-03-88K-0078 from the U. S. Army Research Office.


  • CHO cells
  • Muscarinic receptors
  • P-F-hexahydro-sila-difenidol
  • Receptor subtypes


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