title: Interaction of antioxidants and exercise on insulin sensitivity in healthy and prediabetic rats.
abstract: Meal-induced insulin sensitization (MIS) describes the augmented postprandial response to insulin through action of the hepatic insulin sensitizing substance (HISS). HISS-action is impaired in insulin resistance associated with aging and type 2 diabetes, but could be preserved by the antioxidant cocktail SAMEC, along with voluntary exercise. In this study, we tested whether antioxidant supplementation during voluntary training would interact with the effects of exercise on HISS-mediated glucose uptake in healthy and prediabetic rats. The 7-day voluntary running-wheel training was used as an exercise intervention. SAMEC supplementation was provided only during the 7-day training session. The rapid insulin sensitivity test (RIST) was conducted to determine insulin- and HISS-dependent glucose uptake in 14-week-old healthy rats, and sucrose-induced insulin-resistant rats, with or without exercise in the presence or absence of SAMEC supplementation. The postprandial insulin sensitivity was increased by exercise, primarily through enhancement of the HISS-dependent glucose uptake, which remained unaffected by SAMEC. SAMEC supplementation did not either harm or add benefit to the positive effects of exercise on insulin sensitivity in healthy or prediabetic rats. While SAMEC alone was a demonstrated preventive against the progressive loss of HISS action in previous studies, short-term supplementation in this study did not reverse the established disease state.
authors.affiliation: Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Manitoba, A210 - 753 McDermot Avenue, Winnipeg, MB R3E 0T6, Canada. umchowd5@cc.umanitoba.ca
authors.forename: Kawshik K
authors.initials: KK
authors.lastname: Chowdhury
authors.forename: Dallas J
authors.initials: DJ
authors.lastname: Legare
authors.forename: W Wayne
authors.initials: WW
authors.lastname: Lautt
mesh_terms: D050154:Adiposity / Q000187:drug effects / Q000502:physiology; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001786:Blood Glucose / Q000187:drug effects / Q000378:metabolism; D015992:Body Mass Index; D005947:Glucose / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance / Q000502:physiology*; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000502:physiology / Q000503:physiopathology; D008297:Male; D010805:Physical Conditioning, Animal; D019518:Postprandial Period / Q000187:drug effects / Q000502:physiology; D011236:Prediabetic State / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000378:metabolism / Q000503:physiopathology*; D011877:Radionuclide Imaging; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000975:Antioxidants; D001786:Blood Glucose; D007328:Insulin; D005978:Glutathione; D005947:Glucose