当前位置： SCI文献检索 > BRITISH JOURNAL OF PHARMACOLOGY期刊下所有文献 > Pharmacological profile of the novel P2T-purinoceptor antagonist, FPL 67085 in vitro and in the anaesthetized rat in vivo.

Pharmacological profile of the novel P2T-purinoceptor antagonist, FPL 67085 in vitro and in the anaesthetized rat in vivo.

Abstract：

:1. The role of endogenous ADP in platelet aggregation in vivo remains unclear due to the lack of suitable P2T-antagonist probes. This paper describes the potency, selectivity and specificity of the novel P 2T-purinoceptor antagonist, FPL 67085 (2-propylthio-D-beta,gamma-dichloromethylene ATP) both in vitro and in the anaesthetized rat in vivo. 2. FPL 67085 (3-30 nM) produced concentration-dependent rightward displacement of the concentration-effect (E/[A]) curve for ADP-induced aggregation of human washed platelets with no effect on ADP-independent aggregation at < or = 10 microM. 3. Logistic fitting of ADP E/[A] data indicated that the antagonist effect of FPL 67085 did not consistently accord with simple competition: in some preparations depression of the asymptote was seen. Schild analysis of data combined from all preparations, regardless of the antagonist profile observed, gave an apparent pKB of 8.9 (slope parameter 0.90). 4. The potency of FPL 67085 was unaffected by the P1-purinoceptor antagonist, 8-sulphophenyltheophylline, was similar (IC50 0.6-3.8 nM) in human and rat washed platelets or whole blood and, in rat blood, did not change following 2-30 min incubation at 37 degrees C. 5. FPL 67085 was a weak (pA50 approximately 4.2) partial agonist in tissues containing P2X- or P2Y-purinoceptors, indicating some 30,000 fold selectivity for the P2T-subtype. 6. In anaesthetized rats, intravenous infusion of FPL 67085 produced rapidly-reversible, dose-related inhibition of ADP-induced platelet aggregation measured ex vivo (ID50 1.3 micrograms kg-1 min-1) with no significant effect on haemodynamics or circulating cell counts. 7. Thus, FPL 67085 is a potent, specific and selective inhibitor of ADP-induced platelet aggregation both in vitro and in vivo. As such, it represents a novel pharmacological tool to define the role of endogenous ADP in thrombosis and the potential of P2T-purinoceptor antagonists as a novel class of infusible anti-thrombotic agents for acute use in man.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Humphries RG,Tomlinson W,Clegg JA,Ingall AH,Kindon ND,Leff P

doi

10.1111/j.1476-5381.1995.tb15925.x

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

1110-6

issue

eissn

0007-1188

issn

1476-5381

journal_volume

115

pub_type

杂志文章

在线工具

Pharmacological profile of the novel P2T-purinoceptor antagonist, FPL 67085 in vitro and in the anaesthetized rat in vivo.