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The effect of homogenates and excretory/secretory products of Nippostrongylus brasiliensis and of acetylcholinesterase on the amplitude and frequency of contraction of uninfected rat intestine in vitro

Published online by Cambridge University Press:  06 April 2009

N. Foster ,
E. J. Dean  and
D. L. Lee
N. Foster
Affiliation:
Department of Pure and Applied Biology, University of Leeds, Leeds LS2 9JT
E. J. Dean
Affiliation:
Department of Pure and Applied Biology, University of Leeds, Leeds LS2 9JT
D. L. Lee
Affiliation:
Department of Pure and Applied Biology, University of Leeds, Leeds LS2 9JT
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Summary

Whole worm homogenates and excretory/secretory (E/S) products of adult Nippostrongylus brasiliensis significantly decreased the amplitude of contractions of segments of uninfected rat intestine maintained in an organ bath, with significantly larger volumes of E/S products being required to bring about a similar decrease to that caused by the whole worm homogenate. Boiled samples of homogenate and E/S products significantly decreased the amplitude of contractions of uninfected rat intestine, but larger volumes were needed than with unboiled samples. Frequency of contraction was unaltered by homogenates or E/S products. When electric eel AChE was injected into the lumen of segments of uninfected rat intestine maintained in an organ bath there was no significant decrease in the amplitude of contractions. These results suggest that substances present in the E/S products of N. brasiliensis significantly reduce the amplitude of contractions of uninfected rat intestine in vitro and that the biochemical holdfast responsible for this phenomenon may not be AChE.

Keywords

Nippostrongylus brasiliensissecretions/excretionsacetylcholinesteraseintestinal motilitybiochemical holdfast
Type
Research Article
Information
Parasitology , Volume 108 , Issue 4 , May 1994 , pp. 453 - 459
Copyright
Copyright © Cambridge University Press 1994

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