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Effects of Changes in Nutritional Conditions on Timing of Puberty: Clinical Evidence from Adopted Children and Experimental Studies in the Male Rat
Bourguignon, Jean-Pierre; Gerard, Arlette; Alvarez Gonzalez, Maria-Luz et al.
1992In Hormone Research, 38 Suppl 1 (NULL), p. 97-105
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Abstract :
[en] Among 32 patients with idiopathic central precocious puberty seen during a 3-year period, 1/4 were adopted children from developing countries who showed early sexual maturation during the catch-up process following their arrival in Belgium. To study the possible mechanism accounting for such clinical observations, we used the male rat as a model, and evaluated the effect of variations in early nutritional conditions, by manipulating litter size, on hypothalamic and testicular maturation. We had shown previously that, in the male rat, onset of puberty was preceded, between 15 and 25 days of age, by a transiently increased activation of N-methyl-D-aspartate receptors involved in a facilitatory control of pulsatile secretion of gonadotropin-releasing hormone. We also showed that the proportion of elongated spermatids in testicular cell homogenates increased between 25 and 45 days of age. When compared to pups of a small litter (6/dam), those of a large litter (14/dam) showed a reduced growth rate (1.9 vs. 3.5 g/day) before weaning (21 days), whereas they grew at a similar rate (5.6 vs. 4.7 g/day) after weaning. At 35 days of age, the animals raised in the large litter showed evidence of delayed hypothalamic and testicular maturation when compared to animals from the small litter. Reduction of litter size at 17 days allowed food-restricted pups of a large litter to resume a normal growth rate before weaning.(ABSTRACT TRUNCATED AT 250 WORDS)
Disciplines :
Endocrinology, metabolism & nutrition
Author, co-author :
Bourguignon, Jean-Pierre ;  Université de Liège - ULiège > Département des sciences cliniques > Pédiatrie
Gerard, Arlette ;  Centre Hospitalier Universitaire de Liège - CHU > Pédiatrie
Alvarez Gonzalez, Maria-Luz ;  Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
Fawe, L.
Franchimont, P.
Language :
English
Title :
Effects of Changes in Nutritional Conditions on Timing of Puberty: Clinical Evidence from Adopted Children and Experimental Studies in the Male Rat
Publication date :
1992
Journal title :
Hormone Research
ISSN :
0301-0163
eISSN :
1423-0046
Publisher :
Karger, Basel, Switzerland
Volume :
38 Suppl 1
Issue :
NULL
Pages :
97-105
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 September 2009

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