title: Effect of Opuntia humifusa supplementation and acute exercise on insulin sensitivity and associations with PPAR-γ and PGC-1α protein expression in skeletal muscle of rats.
abstract: This study examined whether Opuntia humifusa (O. humifusa), which is a member of the Cactaceae family, supplementation and acute swimming exercise affect insulin sensitivity and associations with PPAR-γ and PGC-1α protein expression in rats. Thirty-two rats were randomly divided into four groups (HS: high fat diet sedentary group, n = 8; HE: high fat diet acute exercise group, n = 8; OS: 5% O. humifusa supplemented high fat diet sedentary group, n = 8; OE: 5% O. humifusa supplemented high fat diet acute exercise group, n = 8). Rats in the HE and OE swam for 120 min. before being sacrificed. Our results indicated that serum glucose level, fasting insulin level and homeostasis model assessment of insulin resistance (HOMA-IR) in OS were significantly lower compared to those of the HS (p < 0.01, p < 0.05, p < 0.05). In addition, PPAR-γ protein expression in the OS and OE was significantly higher than that of the HS and HE, respectively (p < 0.05, p < 0.01). PGC-1α and GLUT-4 protein expressions in the OS were significantly higher compared to those of the HS (p < 0.05, p < 0.05). From these results, O. humifusa supplementation might play an important role for improving insulin sensitivity through elevation of PPAR-γ, PGC-1α, and GLUT-4 protein expression in rat skeletal muscle.
authors.affiliation: Laboratory of Sports Nutrition, Sunmoon University, Asan 336-708, Korea. song6711@sunmoon.ac.kr.
authors.forename: Junyong
authors.initials: J
authors.lastname: Kang
authors.forename: Junghun
authors.initials: J
authors.lastname: Lee
authors.forename: Daekeun
authors.initials: D
authors.lastname: Kwon
authors.forename: Youngju
authors.initials: Y
authors.lastname: Song
mesh_terms: D000818:Animals; D001835:Body Weight; D051275:Glucose Transporter Type 4 / Q000378:metabolism; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism*; D029747:Opuntia / Q000737:chemistry*; D009929:Organ Size; D047495:PPAR gamma / Q000378:metabolism*; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D010805:Physical Conditioning, Animal; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D051275:Glucose Transporter Type 4; D007328:Insulin; D047495:PPAR gamma; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D010936:Plant Extracts; C501429:Ppargc1a protein, rat; D014157:Transcription Factors
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