May 1, 1986

Role of alpha- and beta-adrenoreceptors of the jejunum and ileum in displays of their contractile reactions

Fiziologicheskiĭ zhurnal SSSR imeni I. M. Sechenova
V I OvsiannikovO Iu Grishina

Abstract

Acute experiments were performed on isolated segments of the cat small intestine vessels. The contractile activity of the jejunum and ileum was estimated by the maximal isometric tension. Blocking of the alpha-adrenoreceptors with phentolamine induced a reinforcement of the contractile reactions, whereas blocking of the beta-adrenoreceptors with propranolol led to inhibition of both jejunum and ileum contractile responses either to exogenous acetylcholine or electrical stimulation of vagal efferent fibers. The subthreshold activation of alpha-adrenoreceptors with noradrenaline induced mostly inhibition, whereas activation of beta-adrenoreceptors with isopropylnoradrenaline caused a potentiation of the contractile response to exogenous acetylcholine. The data obtained suggest existence of excitatory beta-adrenoreceptors with a presynaptic localization in the jejunum and ileum.

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Mentioned in this Paper

Establishment and Maintenance of Localization
Small Intestinal Wall Tissue
Ileum
Vagus Nerve Structure
Entire Small Intestine
Norepinephrine
Neoplasm of Uncertain or Unknown Behavior of Small Intestine
Beta-adrenergic receptor
Norepinephrine Measurement
Metabolic Inhibition

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