The ontogeny of the postingestive inhibitory effect of peptone in rats

Physiology & Behavior
A Weller, L Tsitolovskya

Abstract

The ontogeny of the postingestive inhibitory control of intake by protein digestion products was investigated by administering gastric preloads of a peptone that was a hydrolysate of meat and that decreased intake in adult rats [Am. J. Physiol., Regul. Integr. Comp. Physiol. 276 (1999) R1623; Am. J. Physiol., Regul. Integr. Comp. Physiol. 277 (1999) R1144]. Gastric preloads of saline or peptone, or sham preloads were given 5 min before a 30-min, independent ingestion test in which pups had access to a sweet, high-fat milk diet. Preloads of isotonic peptone reduced intake significantly more than preloads of isotonic saline on postnatal day (P) 18, but not on P12. Pretreatment with the CCKA receptor antagonist devazepide (600 microg/kg ip) did not change the inhibitory effect of isotonic peptone. Thus, the inhibitory effect of peptone on P18 was apparently not mediated by endogenous CCK acting at CCKA receptors. In contrast to isotonic peptone, preloads of hypertonic peptone did not decrease intake more than preloads of hypertonic saline on P12, P18, or P24. We conclude that if the isotonic peptone used in these experiments is an adequate model of the digestion products of dietary protein at these postnatal ages, then the posting...Continue Reading

References

Mar 30, 1990·Science·A WellerJ Gibbs
Nov 1, 1989·Physiology & Behavior·S E Swithers, W G Hall
Aug 1, 1996·Physiology & Behavior·A WellerG P Smith
Oct 1, 1997·Physiology & Behavior·A WellerG P Smith
Nov 5, 2002·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Roger D ReidelbergerMartin Hulce
May 10, 2003·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Roger D ReidelbergerMartin Hulce

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Citations

Jun 14, 2006·Developmental Psychobiology·Aron Weller
Jun 14, 2006·Developmental Psychobiology·Gerard P Smith
Aug 16, 2005·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·S BlumbergA Weller
Aug 29, 2020·Brain Research Bulletin·Taisy Cinthia Ferro CavalcanteSandra Lopes de Souza

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