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Dietary conjugated linoleic acid lowered tumor necrosis factor-alpha content and altered expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of Zucker rats.
J Agric Food Chem. 2006 Oct 04; 54(20):7935-9.JA

Abstract

Type-2 diabetes is characterized by obesity-related insulin resistance. Insulin resistance and accompanying hyperinsulinemia have been reported to play an important role in pathogenesis of the metabolic syndrome. Conjugated linoleic acid (CLA), a mixture of positional and geometric isomers of linoleic acid, has attracted considerable attention because of its potentially beneficial biological effects. Previous studies showed that dietary CLA alleviates diabetes through improvement of glucose tolerance and insulin-stimulated glucose transport activity in skeletal muscle of diabetic rats. Skeletal muscle plays an important role both in insulin-mediated glucose metabolism and in lipid metabolism. In the present study, we evaluated comprehensively the effect of dietary CLA on the expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of obese, diabetic Zucker rats. After 8 weeks of feeding, expression of lipogenic genes was decreased in tendency, while expression of lipolytic genes was markedly increased by dietary CLA. Additionally, expression of genes-related insulin sensitivity, such as adiponectin receptor 1, was significantly enhanced, and mRNA level of peroxisome proliferator activated receptor-alpha, known as a transcriptional factor related lipid metabolism and insulin signaling in skeletal muscle, was markedly increased in CLA-fed rats. We also showed that dietary CLA significantly decreased the level of tumor necrosis factor-alpha (TNF-alpha), associated with the development of insulin resistance, in the skeletal muscle of Zucker rats. We suppose that the attenuated TNF-alpha accumulation in skeletal muscle may contribute to the alteration of expression of several genes and the alleviation of insulin resistance in CLA-fed Zucker rats.

Authors+Show Affiliations

Laboratory of Nutrition Biochemistry, Department of Applied Biochemistry and Food Science, Saga University, Saga 840-8502, Japan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17002473

Citation

Inoue, Nao, et al. "Dietary Conjugated Linoleic Acid Lowered Tumor Necrosis Factor-alpha Content and Altered Expression of Genes Related to Lipid Metabolism and Insulin Sensitivity in the Skeletal Muscle of Zucker Rats." Journal of Agricultural and Food Chemistry, vol. 54, no. 20, 2006, pp. 7935-9.
Inoue N, Nagao K, Wang YM, et al. Dietary conjugated linoleic acid lowered tumor necrosis factor-alpha content and altered expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of Zucker rats. J Agric Food Chem. 2006;54(20):7935-9.
Inoue, N., Nagao, K., Wang, Y. M., Noguchi, H., Shirouchi, B., & Yanagita, T. (2006). Dietary conjugated linoleic acid lowered tumor necrosis factor-alpha content and altered expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of Zucker rats. Journal of Agricultural and Food Chemistry, 54(20), 7935-9.
Inoue N, et al. Dietary Conjugated Linoleic Acid Lowered Tumor Necrosis Factor-alpha Content and Altered Expression of Genes Related to Lipid Metabolism and Insulin Sensitivity in the Skeletal Muscle of Zucker Rats. J Agric Food Chem. 2006 Oct 4;54(20):7935-9. PubMed PMID: 17002473.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dietary conjugated linoleic acid lowered tumor necrosis factor-alpha content and altered expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of Zucker rats. AU - Inoue,Nao, AU - Nagao,Koji, AU - Wang,Yu-Ming, AU - Noguchi,Hiroki, AU - Shirouchi,Bungo, AU - Yanagita,Teruyoshi, PY - 2006/9/28/pubmed PY - 2006/12/9/medline PY - 2006/9/28/entrez SP - 7935 EP - 9 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 54 IS - 20 N2 - Type-2 diabetes is characterized by obesity-related insulin resistance. Insulin resistance and accompanying hyperinsulinemia have been reported to play an important role in pathogenesis of the metabolic syndrome. Conjugated linoleic acid (CLA), a mixture of positional and geometric isomers of linoleic acid, has attracted considerable attention because of its potentially beneficial biological effects. Previous studies showed that dietary CLA alleviates diabetes through improvement of glucose tolerance and insulin-stimulated glucose transport activity in skeletal muscle of diabetic rats. Skeletal muscle plays an important role both in insulin-mediated glucose metabolism and in lipid metabolism. In the present study, we evaluated comprehensively the effect of dietary CLA on the expression of genes related to lipid metabolism and insulin sensitivity in the skeletal muscle of obese, diabetic Zucker rats. After 8 weeks of feeding, expression of lipogenic genes was decreased in tendency, while expression of lipolytic genes was markedly increased by dietary CLA. Additionally, expression of genes-related insulin sensitivity, such as adiponectin receptor 1, was significantly enhanced, and mRNA level of peroxisome proliferator activated receptor-alpha, known as a transcriptional factor related lipid metabolism and insulin signaling in skeletal muscle, was markedly increased in CLA-fed rats. We also showed that dietary CLA significantly decreased the level of tumor necrosis factor-alpha (TNF-alpha), associated with the development of insulin resistance, in the skeletal muscle of Zucker rats. We suppose that the attenuated TNF-alpha accumulation in skeletal muscle may contribute to the alteration of expression of several genes and the alleviation of insulin resistance in CLA-fed Zucker rats. SN - 0021-8561 UR - https://www.unboundmedicine.com/medline/citation/17002473/Dietary_conjugated_linoleic_acid_lowered_tumor_necrosis_factor_alpha_content_and_altered_expression_of_genes_related_to_lipid_metabolism_and_insulin_sensitivity_in_the_skeletal_muscle_of_Zucker_rats_ L2 - https://doi.org/10.1021/jf061284v DB - PRIME DP - Unbound Medicine ER -