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Chemical Senses 21: 313-321,
© 1996

research-article

Chemoreceptive Control of Feeding Processes in Hydra

W. Grosvenor1,3, D.E. Rhoads2,4 and G. Kass-Simon1

1Department of Biology, University of Rhode Island Kingston, Rl 02881, USA 2Departments of Biochemistry, Microbiology and Molecular Genetics, University of Rhode Island Kingston, Rl 02881, USA

Correspondence to be sent to: Dr G. Kass-Simon, Department of Zoology, University of Rhode Island, Kingston, Rl 02881, USA

Cnidarians are the simplest metazoans to exhibit satiety after feeding. When hydra are fed to repletion, they close their mouths and cease to capture prey. As feeding stops, contractions of the tentacles and body column increase. Our earlier experiments showed that a gel chromatographic fraction of prey substances inhibits prey capture. We now present evidence that the same fraction reduces the duration of mouth opening induced by reduced glutathione (GSH) and inhibits the binding of GSH to its putative receptor. The fraction also induces column contractions which are similar to those normally seen in sated animals. Prey substances, of unfractionated homogenate, also induce post-feeding tentacle contractions similar to those seen in sated animals. Gut distention does not appear to induce behavior associated with satiety. Therefore, these experiments suggest that chemoreception of prey substances induce satiety in hydra. Chem. Senses 21: 313–321, 1996.

3Current addresses: Monell Chemical Senses Center, 3500 Market St., Philadelphia, PA 19104

4Current addresses: Department of Biology, Monmouth University, West Long Branch, NJ 07764, USA


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