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1.
JAMA ; 229(14): 1863-4, 1974 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-4479161
14.
Br J Pharmacol ; 41(1): 113-21, 1971 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-4396127

RESUMO

1. The beta-adrenoceptor antagonist activity of 3-methoxyisoprenaline, the O-methylated metabolite of isoprenaline, was studied on isolated driven atrial strip and tracheal chain preparations of the guinea-pig and on the hind limb blood flow of the dog.2. On both the atrial strip and tracheal chain preparations the blockade of responses to isoprenaline fulfilled the criteria for simple competitive inhibition.3. 3-Methoxyisoprenaline decreased the vasodilator response to isoprenaline in the dog hind limb, but did not affect the response to noradrenaline.4. 3-Methoxyisoprenaline had about 1/3,700 of the potency of propranolol as a beta-adrenoceptor antagonist on the tracheal chain preparation, 1/1,000 on the atrial strip preparation and less than 1/400 on the hind limb blood flow.5. The antagonist activity of 3-methoxyisoprenaline showed a slight specificity for cardiac beta-adrenoceptors, being 4.3 times more active on guinea-pig atria than on trachea.6. Although 3-methoxyisoprenaline antagonized the actions of isoprenaline in the three preparations, its activity was extremely weak. It is unlikely that the formation of 3-methoxyisoprenaline from isoprenaline, administered therapeutically, could lead to beta-adrenoceptor blockade.


Assuntos
Coração/efeitos dos fármacos , Músculo Liso/efeitos dos fármacos , Fluxo Sanguíneo Regional/efeitos dos fármacos , Simpatolíticos/farmacologia , Antagonistas Adrenérgicos beta/farmacologia , Animais , Vasos Sanguíneos/efeitos dos fármacos , Dilatação/efeitos dos fármacos , Cães , Feminino , Cobaias , Membro Posterior/irrigação sanguínea , Técnicas In Vitro , Isoproterenol/antagonistas & inibidores , Isoproterenol/metabolismo , Isoproterenol/uso terapêutico , Masculino , Contração Muscular/efeitos dos fármacos , Norepinefrina/farmacologia , Propranolol/farmacologia , Traqueia/efeitos dos fármacos
18.
Br J Pharmacol ; 40(3): 437-45, 1970 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-4322371

RESUMO

1. Earlier it had been found that during fat mobilization there was an increased blood flow in the adipose tissue and the tissue contained a vasodilator substance.2. Extract of an activated fat pad contained 3 to 25 times as much activity as the contralateral resting fat pad.3. The following findings suggest that the vasodilator substance is prostagladin E(2):(a) It caused contractions of the guinea-pig ileum which were not reduced by mepyramine, but were reduced by atropine.(b) It caused a prolonged vasodilator response when injected closearterially to the epigastric fat pad.(c) It was eluted from a silicic acid column by a solvent system which is known to elute prostaglandins of the E series but not those of the F series.(d) Its indices of discrimination were similar to those of prostaglandin E's when assayed on three different pharmacological preparations.(e) On thin-layer chromatography it behaved more like prostaglandin E(2) than E(1).4. Neither prostaglandin E(1) nor prostaglandin E(2) inhibited the release of free fatty acids from the rabbit epigastric fat pad by ACTH(1-24).5. It seems likely that prostaglandin E(2) is responsible for the vasodilatation accompanying fat mobilization from adipose tissue.


Assuntos
Tecido Adiposo/irrigação sanguínea , Tecido Adiposo/efeitos dos fármacos , Hormônio Adrenocorticotrópico/farmacologia , Animais , Bioensaio , Vasos Sanguíneos/efeitos dos fármacos , Cromatografia em Camada Fina , Dilatação/efeitos dos fármacos
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