Document Detail

Reversal of fasting-induced suppression of luteinizing hormone (LH) secretion in male rhesus monkeys by intragastric nutrient infusion: evidence for rapid stimulation of LH by nutritional signals.
MedLine Citation:
PMID:  8477642     Owner:  NLM     Status:  MEDLINE    
Short periods of fasting (1-2 days) significantly suppress the frequency of pulsatile LH secretion in adult male rhesus monkeys. Resumption of food intake (i.e. refeeding) after fasting rapidly restores pulsatile LH secretion. We hypothesized that the resumption of LH secretion after refeeding results from the metabolic consequences of food intake rather than from relief of the psychological stress associated with fasting. To differentiate between these two possible types of signals, we attempted to provide fasting monkeys with the nutritional signals of a refeed meal without relieving the psychological stress associated with fasting. To do this, we provided monkeys with a refeed meal via indwelling gastric cannulae while continuing to deny them access to monkey chow. Nine adult male rhesus monkeys with indwelling gastric and venous catheters were fasted for 1 day, and on the following day they received a liquid nutrient infusion (equal in caloric content and macronutrient composition to a normal meal) at the normal feeding time (1100 h) via the gastric cannulae. Blood samples were collected from 0600-2400 h at 20-min intervals. Nutrient infusions caused a restoration of pulsatile LH secretion that was not different from the restoration caused by refeeding a normal meal of Purina monkey chow. In contrast, LH secretion remained suppressed on a second day of fasting. Additionally, monkeys receiving nutrient infusions displayed behavioral agitation similar to fasting monkeys, while monkeys refed monkey chow showed very little agitation. These findings support the hypothesis that nutritional/metabolic signals, rather than the relief of psychological stress, lead to the resumption of pulsatile LH secretion after refeeding.
D A Schreihofer; J A Amico; J L Cameron
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Endocrinology     Volume:  132     ISSN:  0013-7227     ISO Abbreviation:  Endocrinology     Publication Date:  1993 May 
Date Detail:
Created Date:  1993-05-25     Completed Date:  1993-05-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375040     Medline TA:  Endocrinology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1890-7     Citation Subset:  AIM; IM    
Department of Behavioral Neuroscience, University of Pittsburgh, Pennsylvania 15260.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Arginine Vasopressin / blood
Behavior, Animal
Catheters, Indwelling
Enteral Nutrition
Fasting / physiology*
Luteinizing Hormone / secretion*
Macaca mulatta
Signal Transduction / physiology*
Stress, Psychological
Grant Support
Reg. No./Substance:
113-79-1/Arginine Vasopressin; 9002-67-9/Luteinizing Hormone
Comment In:
Endocrinology. 1993 May;132(5):1879-80   [PMID:  8477640 ]

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