These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: alpha-Adrenoceptor subtypes in isolated corporal tissue from patients undergoing gender re-assignment.
    Author: El-Gamal OM, Sandhu DP, Terry T, Elliott RA.
    Journal: BJU Int; 2006 Feb; 97(2):329-32. PubMed ID: 16430640.
    Abstract:
    OBJECTIVE: To investigate the pharmacology and functionality of alpha(1)-adrenoceptors in human corpus cavernosum, and to determine the predominant subtype. MATERIALS AND METHODS: Cavernosal tissue specimens were obtained from the penises of 22 men (mean age 37.4 years) removed during gender re-assignment surgery. The men had been maintained on long-term oestrogen therapy before surgery, to aid the development of secondary feminine characteristics (oestrogen treatments were stopped 6 weeks before surgery). Corpus cavernosum strips were mounted in organ baths perfused with Krebs' solution. A control concentration-response curve (CRC) to phenylephrine (a nonselective alpha(1)-agonist) was obtained. Then the tissues were incubated with the alpha(1A) antagonist, WB4101; the alpha(1B) antagonist, chloroethylclonidine; or the alpha(1D) antagonist BMY 7378 (all at 1 microm) and the CRC to phenylephrine was repeated. The concentration producing a half-maximal response (EC(50)) and pK(B) values (logarithm of the dissociation constant, a measure of affinity) were determined. RESULTS: WB4101 produced a parallel rightward shift of the CRC to phenylephrine, with a pK(B) of 7.49. BMY 7378 also produced a parallel rightward shift of the CRC to phenylephrine with a pK(B) of 6.45. Chloroethylclonidine had a similar effect on the phenylephrine CRC, with a pK(B) of 5.90. CONCLUSION: Alpha(1)-adrenoceptors in human cavernosal tissue have a relatively low affinity for BMY 7378 and chloroethylclonidine, but are more sensitive to WB4101. This confirms that the predominant alpha(1)-adrenoceptor subtype in human corpus cavernosum is the alpha(1A) subtype and this might help in developing more selective antagonists and agonists for managing erectile dysfunction and priapism.
    [Abstract] [Full Text] [Related] [New Search]