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Titolo:
ADENOSINE AND CHOLINERGIC-INDUCED GASTRIC CONTRACTION IN RATS
Autore:
CHO CH; QIU BS; BALLARD HJ; OGLE CW;
Indirizzi:
UNIV HONG KONG,FAC MED,DEPT PHARMACOL,5 SASSOON RD HONG KONG HONG KONG UNIV HONG KONG,FAC MED,DEPT PHYSIOL HONG KONG HONG KONG
Titolo Testata:
Digestion
fascicolo: 2, volume: 54, anno: 1993,
pagine: 98 - 104
SICI:
0012-2823(1993)54:2<98:AACGCI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROSTAGLANDINS;
Keywords:
ADENOSINE; BETHANECHOL; ACETYLCHOLINE; GASTRIC CONTRACTION; BLOOD PRESSURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
C.H. Cho et al., "ADENOSINE AND CHOLINERGIC-INDUCED GASTRIC CONTRACTION IN RATS", Digestion, 54(2), 1993, pp. 98-104

Abstract

Adenosine is known for its modulatory effects on gastric secretory function and mucosal blood flow in rats. However, its action on gastric motility has not been defined. The influence of adenosine on gastric contractions provoked by cholinergic drugs and direct vagal stimulationhave, therefore, been examined. Bethanechol (25, 50 or 100 mug/kg i.v.) and electrical vagal stimulation dose and voltage dependently increased the number and the amplitude of gastric contractions. An adenosine-A1-receptor agonist, L-phenylisopropyladenosine (10 or 50 mug/kg s.c.), given 30 min beforehand, did not affect the changes in gastric parameters but decreased the basal mean blood pressure and lessened the reduction in blood pressure evoked by bethanechol. The adenosine-A2-receptor agonist N-ethylcarboxaminoadenosine (1 or 5 mug/kg s.c.), 30 minbeforehand, however, significantly increased the number but not the force of gastric contractions; a lower dose of this drug increased the basal blood pressure and potentiated the depressive action of bethanechol on systemic blood pressure. Adenosine administration (7.5 mg/kg s.c.) significantly increased its plasma levels at 30 and 60 min after injection; pretreatment with it (2.5, 7.5 or 12.5 mg/kg s.c.), 30 min beforehand, did not affect the gastric and vascular actions of bethanechol. The highest dose of adenosine potentiated the contractile response of vagal stimulation. In the isolated fundus preparation, adenosine added to the organ bath (10(-6), 10(-4), 10(-2) M) also did not affectthe contractions induced by acetylcholine. It is concluded that adenosine lacks an effect on the contractile cholinoceptors located on the smooth muscles of stomachs and blood vessels, but the nucleoside couldhave a presynaptic effect in potentiating the contractile action of direct vagal stimulation.

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Documento generato il 29/09/20 alle ore 23:40:07