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Journal of Lipid Research, Vol. 48, 1701-1709, August 2007
Copyright © 2007 by American Society for Biochemistry and Molecular Biology

CLA differently regulates adipogenesis in stromal vascular cells from porcine subcutaneous adipose and skeletal muscle

Xuan Zhou^*, Defa Li^1,*, Jingdong Yin^1,*, Jianjun Ni^*, Bing Dong^*, Jinxiao Zhang^* and Min Du

^* National Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100094, China
Department of Animal Science, University of Wyoming, Laramie, WY 82071

Published, JLR Papers in Press, May 11, 2007.

¹ To whom correspondence should be addressed. e-mail: defali{at}public2.bta.net.cn (D.L.); yinjd{at}mafic.ac.cn (J.Y.)

Conjugated linoleic acid (CLA), a mixture of isomers of linoleic acid, has previously been shown to be able to decrease porcine subcutaneous (SC) adipose tissue levels while increasing the count of intramuscular (IM) adipose tissue in vivo. However, the underlying mechanisms through which it acts are poorly understood. The objective of this study was to investigate the different effects of CLA on adipogenesis in cultured SC adipose tissue and IM stromal vascular cells obtained from neonatal pigs. As shown here, trans-10, cis-12 CLA decreased the expression of adipocyte-specific genes as well as adipose precursor cell numbers and the accumulation of lipid in cultured SC adipose tissue stromal vascular cells. However, the cis-9, trans-11 CLA did not alter adipogenesis in SC cultures. On the other hand, both CLA isomers increased the expression of adipocyte-specific genes in IM cultures, together with the increasing accumulation of lipid and Oil Red O-stained cells. Collectively, these data show that CLA decreases SC adipose tissue but increases IM adipose tissue by different regulation of adipocyte-specific gene expression. These results suggest that adipogenesis in IM adipocytes differs from that in SC adipocytes.

Supplementary key words adipocyte-specific gene • adipose precursor cell • proliferation • differentiation • subcutaneous adipose tissue • intramuscular adipose tissue • conjugated linoleic acid

Abbreviations: ADD-1, adipocyte determination and differentiation factor-1; aP2, adipocyte fatty acid binding protein; C/EBP, CAAT/enhancer binding protein ; CLA, conjugated linoleic acid; IM, intramuscular; IR, insulin receptor; OROSM, Oil Red O-stained material; PPAR, peroxisome proliferator-activated receptor ; SC, subcutaneous

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