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The effect of long term under- and over-feeding on the expression of genes related to lipid metabolism in mammary tissue of sheep

Published online by Cambridge University Press:  01 December 2014

Eleni Tsiplakou ,
Emmanouil Flemetakis ,
Evangelia-Diamanto Kouri ,
Kyriaki Sotirakoglou  and
George Zervas
Eleni Tsiplakou*
Affiliation:
Department of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Emmanouil Flemetakis
Affiliation:
Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Evangelia-Diamanto Kouri
Affiliation:
Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Kyriaki Sotirakoglou
Affiliation:
Department of Mathematics and Statistics, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
George Zervas
Affiliation:
Department of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
*
*For correspondence; e-mail: [email protected]
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Abstract

Milk fatty acid (FA) synthesis by the mammary gland involves expression of a large number of genes whose nutritional regulation remains poorly defined. In this study, we examined the effect of long-term under- and over-feeding on the expression of genes (acetyl Co A carboxylase, ACC; fatty acid synthetase, FAS; lipoprotein lipase, LPL; stearoyl Co A desaturase, SCD; peroxisome proliferator activated receptor γ2, PPARγ2; sterol regulatory element binding protein-1, SREBP-1c; and hormone sensitive lipase, HSL) related to FA metabolism in sheep mammary tissue (MT). Twenty-four lactating sheep were divided into three homogenous sub-groups and fed the same ration in quantities covering 70% (underfeeding), 100% (control) and 130% (overfeeding) of their energy and crude protein requirements. The results showed a significant reduction of mRNA of ACC, FAS, LPL and SCD in the MT of underfed sheep, and a significant increase on the mRNA of LPL and SREBP-1c in the MT of overfed compared with the control respectively. In conclusion, the negative, compared to positive, energy balance in sheep down-regulates ACC, FAS, LPL, SCD, SREBP-1c and PPARγ2 expression in their MT which indicates that the decrease in nutrient availability may lead to lower rates of lipid synthesis.

Keywords

Underfeedingoverfeedinglipogenic genesheep
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 1 , February 2015 , pp. 107 - 112
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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