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Neurohumoral control of villous motility

, : Neurohumoral control of villous motility. American Journal of Physiology 255(2 Pt 1): G162-G167

A quantitative videomicroscopic method was used to examine neurohumoral control of villous motility. Intraduodenal instillation of saline, 0.4% hydrochloric acid, or acidified predigested food not cause a significant change in villous contraction frequency in an isolated segment of jejunum. Villous motility in the jejunum of fed dogs, from which the chyme had been removed, was not greater than that in fasted dogs (2.9 .+-. 0.3 vs 3.4 .+-. 0.5 contractions/min). Furthermore, acid extracts of the duodenal mucosa did not produce an increase in jejunal villous motility when injected intravenously. These data argue against the existence of a humoral stimulant of villous motility (villikinin). Vagotomy caused only a small (20%) and transient (10 min) decline in villous motility. Vagal stimulation at 5, 10, and 20 Hz caused villous motility to increase by 24 .+-. 7, 23 .+-. 9, and 32 .+-. 10%, respectively. Atropine blocked the effects of vagal stimulation. Section of the periarterial (sympathetic) nerves did not alter villous contractile activity. Stimulation of the periarterial nerves at 5, 10, and 20 Hz caused villous contraction frequency to decline by 41 .+-. 5, 45 .+-. 5, and 38 .+-. 10%, respectively. This inhibition appears to involve both .alpha.- and .beta.-adrenergic receptors and a reduction in blood flow. Neither atropine, .alpha.-blockade, nor .beta.-blockade produced a sustained alteration in basal contraction frequency.

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Accession: 001893080

PMID: 3407775

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