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: Endothelin receptor subtypes in the pathogenesis of angioplasty-induced neointima formation in the rat: a comparison of selective ETA receptor antagonism and dual ETA/ETB receptor antagonism using BQ-123 and SB 209670.
    Author: Douglas SA, Vickery-Clark LM, Louden C, Elliott JD, Ohlstein EH.
    Journal: J Cardiovasc Pharmacol; 1995; 26 Suppl 3():S186-9. PubMed ID: 8587358.
    Abstract:
    The present study compared the vasculoprotective efficacy of acute and chronic endothelin (ET) ETA or dual ETA/B receptor antagonism in the rat common carotid artery (RCCA) model using BQ-123 and SB 209670. Acute intra-arterial infusion (0.1 mg/kg/min) for 2 h at the time of angioplasty of either BQ-123 or SB 209670 did not attenuate the neointima lesion formation observed 2 weeks after angioplasty (neointima:media ratios of 137% and 116% of control, respectively). In contrast, chronic administration of SB 209670 (bolus i.p. injection, 2.5 mg/kg b.i.d.) attenuated lesion formation (neointima:media ratio inhibited by 52% relative to vehicle control; p < 0.05). An identical dosage regimen of BQ-123 did not exhibit significant vasculoprotection (neointima:media ratio of 128% vehicle control). However, this dosage regimen of BQ-123 was associated with significant and selective ETA receptor antagonism. The systemic pressor response to exogenous ET-1 administration was inhibited by 91% (p < 0.05), whereas the associated depressor response was not different from that observed in vehicle-treated rats. Therefore, since chronic administration of pharmacologic doses of the ETA-selective antagonist BQ-123 does not prevent lesion formation in the RCCA model, whereas the ETA/B receptor antagonist SB 209670 is vasculoprotective, the data implicate a significant role for the ETB receptor subtype, either exclusively or in concert with ETA receptor activation, in the pathogenesis of neointima formation in the rat.
    [Abstract] [Full Text] [Related] [New Search]