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Differential expression of peroxisomal proliferator activated receptors alpha and delta in skeletal muscle in response to changes in diet and exercise.
Int J Mol Med. 2006 Jan; 17(1):45-52.IJ

Abstract

Peroxisome proliferator-activated receptors (PPARs) alpha, delta and gamma are nuclear transcription factors that control key genes involved in fatty acid metabolism and energy homeostasis. Little is known about PPAR activation in vivo and the existence of overlapping functions between PPARalpha, -delta and -gamma. As skeletal muscle is an important site for insulin action and acts as a significant sensor for life-style-induced influences in whole-body energy metabolism, we investigated the expression of PPARalpha, -delta and -gamma in rat skeletal muscle in response to exercise after four- and twelve-weeks of high-fat feeding, respectively. PPARalpha mRNA expression in skeletal muscle increased in parallel with other signs of developing metabolic syndrome such as increased visceral fat pad volymes, plasma free fatty acids and muscle triglyceride concentrations. PPARalpha mRNA expression was up-regulated 3-fold after four weeks of high-fat feeding (p<0.01). Exercise reversed the high-fat induced increase in PPARalpha expression in young lean rats (p<0.05), but did not change the PPARalpha, -delta and -gamma expression in the skeletal muscle in the normal nutritional state. The increase in PPARalpha expression declined during a longer term of high-fat feeding. In contrast, exercise increased PPARdelta mRNA and protein expression 3- to 6-fold in skeletal muscle after longer-term high-fat feeding (p<0.05). This effect was accompanied by a reduction in skeletal muscle fat content. These findings suggest that parallel activation of PPARalpha and -delta expression in skeletal muscle may be an important adaptive mechanism in response to increased fatty acid loads in young, lean animals, protecting them from insulin resistance, whereas exercise might be needed to mediate the same positive effects in older animals.

Authors+Show Affiliations

Department of Medicine, Karolinska Instituet, Stockholm, Sweden.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

16328010

Citation

Kannisto, Katja, et al. "Differential Expression of Peroxisomal Proliferator Activated Receptors Alpha and Delta in Skeletal Muscle in Response to Changes in Diet and Exercise." International Journal of Molecular Medicine, vol. 17, no. 1, 2006, pp. 45-52.
Kannisto K, Chibalin A, Glinghammar B, et al. Differential expression of peroxisomal proliferator activated receptors alpha and delta in skeletal muscle in response to changes in diet and exercise. Int J Mol Med. 2006;17(1):45-52.
Kannisto, K., Chibalin, A., Glinghammar, B., Zierath, J. R., Hamsten, A., & Ehrenborg, E. (2006). Differential expression of peroxisomal proliferator activated receptors alpha and delta in skeletal muscle in response to changes in diet and exercise. International Journal of Molecular Medicine, 17(1), 45-52.
Kannisto K, et al. Differential Expression of Peroxisomal Proliferator Activated Receptors Alpha and Delta in Skeletal Muscle in Response to Changes in Diet and Exercise. Int J Mol Med. 2006;17(1):45-52. PubMed PMID: 16328010.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differential expression of peroxisomal proliferator activated receptors alpha and delta in skeletal muscle in response to changes in diet and exercise. AU - Kannisto,Katja, AU - Chibalin,Alexander, AU - Glinghammar,Björn, AU - Zierath,Juleen R, AU - Hamsten,Anders, AU - Ehrenborg,Ewa, PY - 2005/12/6/pubmed PY - 2006/3/11/medline PY - 2005/12/6/entrez SP - 45 EP - 52 JF - International journal of molecular medicine JO - Int. J. Mol. Med. VL - 17 IS - 1 N2 - Peroxisome proliferator-activated receptors (PPARs) alpha, delta and gamma are nuclear transcription factors that control key genes involved in fatty acid metabolism and energy homeostasis. Little is known about PPAR activation in vivo and the existence of overlapping functions between PPARalpha, -delta and -gamma. As skeletal muscle is an important site for insulin action and acts as a significant sensor for life-style-induced influences in whole-body energy metabolism, we investigated the expression of PPARalpha, -delta and -gamma in rat skeletal muscle in response to exercise after four- and twelve-weeks of high-fat feeding, respectively. PPARalpha mRNA expression in skeletal muscle increased in parallel with other signs of developing metabolic syndrome such as increased visceral fat pad volymes, plasma free fatty acids and muscle triglyceride concentrations. PPARalpha mRNA expression was up-regulated 3-fold after four weeks of high-fat feeding (p<0.01). Exercise reversed the high-fat induced increase in PPARalpha expression in young lean rats (p<0.05), but did not change the PPARalpha, -delta and -gamma expression in the skeletal muscle in the normal nutritional state. The increase in PPARalpha expression declined during a longer term of high-fat feeding. In contrast, exercise increased PPARdelta mRNA and protein expression 3- to 6-fold in skeletal muscle after longer-term high-fat feeding (p<0.05). This effect was accompanied by a reduction in skeletal muscle fat content. These findings suggest that parallel activation of PPARalpha and -delta expression in skeletal muscle may be an important adaptive mechanism in response to increased fatty acid loads in young, lean animals, protecting them from insulin resistance, whereas exercise might be needed to mediate the same positive effects in older animals. SN - 1107-3756 UR - https://www.unboundmedicine.com/medline/citation/16328010/Differential_expression_of_peroxisomal_proliferator_activated_receptors_alpha_and_delta_in_skeletal_muscle_in_response_to_changes_in_diet_and_exercise_ L2 - http://www.spandidos-publications.com/ijmm/17/1/45 DB - PRIME DP - Unbound Medicine ER -