Document Detail


Effect of acute food restriction on pulmonary growth and protein turnover in preterm guinea pigs.
MedLine Citation:
PMID:  1539652     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of food restriction on the growth and protein turnover of the immature lung were investigated. Preterm guinea pigs, delivered by cesarean section at 65 days gestation (term = 68 days), were given free access to a lactating dam or restricted from feeding for 48 h. Food restriction resulted in significantly reduced body and lung (P less than 0.05) weight compared with fed controls. The rate of pulmonary protein synthesis determined in vivo was reduced by 33% in the food-restricted pups (28.9 +/- 10.2 vs. 19.4 +/- 4.5%, P less than 0.05 for control and food-restricted pups, respectively), whereas the calculated rate of protein breakdown remained unchanged. The inhibition of protein synthesis was accounted for by a 36% decrease in ribosomal efficiency (11.03 +/- 2.61 vs. 7.04 +/- 1.26%, P less than 0.01 for control and food-restricted pups, respectively), whereas ribosomal capacity was unaltered. Polyribosomal analysis indicated an increase in the proportion of RNA present in polysomes and a fall in the free monomer pool (26%), suggesting that food restriction blocked translation by reducing the rate of peptide chain elongation. This finding was confirmed by the analysis of ribosome transit times, which indicated a significant increase in the elongation rate in the lungs from food-restricted pups (0.51 +/- 0.11 vs. 0.94 +/- 0.19 min, P less than 0.05 for control and food-restricted pups, respectively). These results imply that nutrient supply plays an important role in protein deposition and hence growth and repair capacity of the immature lung.
Authors:
F J Kelly; J C Fussell; T D Postle
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  262     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1992 Feb 
Date Detail:
Created Date:  1992-03-31     Completed Date:  1992-03-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E240-5     Citation Subset:  IM    
Affiliation:
Department of Human Nutrition, University of Southampton, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Newborn / growth & development*,  metabolism
Food Deprivation / physiology*
Gestational Age
Guinea Pigs
Lung / growth & development*,  metabolism,  physiology
Proteins / metabolism*
Ribosomes / physiology
Time Factors
Chemical
Reg. No./Substance:
0/Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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