Document Detail

Marginal zinc deficiency in rats decreases leptin expression independently of food intake and corticotrophin-releasing hormone in relation to food intake.
MedLine Citation:
PMID:  17475084     Owner:  NLM     Status:  MEDLINE    
Zn deficiency reduces food intake and growth rate in rodents. To determine the relationship between Zn deficiency and the regulation of food intake, we evaluated leptin gene expression in epididymal white adipose tissue (eWAT), and hypothalamic corticotropin-releasing hormone (hCRH) and hypothalamic neuropeptide Y (hNPY) of rats Zn-deficient only to show reduced food intake and growth rate but not food intake cycling. Growing male Sprague-Dawley rats (240 g) were randomly assigned to one of four dietary groups: Zn-adequate (ZA; 30 mg/kg diet), Zn-deficient (ZD; 3 mg/kg diet), pair-fed with ZD (PF; 30 mg/kg diet) and Zn-sufficient (ZS; 50 mg/kg diet) (n 8), and were fed for 3 weeks. Food intake and body weight were measured, as were blood mononuclear cells and pancreas Zn levels. eWAT leptin, hCRH and hNPY mRNA levels were determined. Food intake was decreased by about 10 % in ZD and PF rats compared to ZA and ZS rats. Growth and eWAT leptin mRNA levels were unaffected in PF rats but were significantly (P < 0.05) decreased in ZD rats. However, hNPY showed a tendency to increase, and hCRH significantly (P < 0.05) decreased, in both ZD and PF rats. These results suggest that while leptin gene expression may be directly affected by Zn, hNPY and hCRH are likely responding to reduced food intake caused by Zn deficiency.
In-Sook Kwun; Young-Eun Cho; Ria-Ann R Lomeda; Soon-Tae Kwon; Yangha Kim; John H Beattie
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The British journal of nutrition     Volume:  98     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-09-25     Completed Date:  2007-10-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  485-9     Citation Subset:  IM    
Department of Food Science and Nutrition, Andong National University, Andong, Kyungpook, 760-749, South Korea.
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MeSH Terms
Adipose Tissue, White / chemistry
Appetite Regulation / physiology*
Corticotropin-Releasing Hormone / analysis*
Epididymis / chemistry
Gene Expression / genetics
Hypothalamus / chemistry
Leptin / genetics*
Neuropeptide Y / analysis
RNA, Messenger / analysis
Rats, Sprague-Dawley
Weight Gain / physiology
Zinc / administration & dosage,  analysis,  deficiency*
Reg. No./Substance:
0/Leptin; 0/Neuropeptide Y; 0/RNA, Messenger; 7440-66-6/Zinc; 9015-71-8/Corticotropin-Releasing Hormone

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