title: Cardiometabolic and reproductive benefits of early dietary energy restriction and voluntary exercise in an obese PCOS-prone rodent model.
abstract: Polycystic ovary syndrome (PCOS) is one of the most common endocrine-metabolic disorders in women of reproductive age characterized by ovulatory dysfunction, hyperandrogenism and cardiometabolic risk. The overweight-obese PCOS phenotype appears to have exacerbated reproductive dysfunction and cardiometabolic risk. In overweight-obese adult women with PCOS, exercise and energy restricted diets have shown limited and inconsistent effects on both cardiometabolic indices and reproductive outcomes. We hypothesized that an early lifestyle intervention involving exercise and dietary energy restriction to prevent or reduce the propensity for adiposity would modulate reproductive indices and cardiometabolic risk in an obese PCOS-prone rodent model. Weanling obese PCOS-prone and Lean-Control JCR:LA-cp rodents were given a chow diet ad libitum or an energy-restricted diet combined with or without voluntary exercise (4  h/day) for 8 weeks. Dietary energy restriction and exercise lowered total body weight gain and body fat mass by 30% compared to free-fed sedentary or exercising obese PCOS-prone animals (P<0.01). Energy restriction induced an increase in exercise intensity compared to free-feeding plus exercise conditions. Energy restriction and exercise decreased fasting plasma triglycerides and apoB48 concentrations in obese PCOS-prone animals compared to free-fed and exercise or sedentary groups. The energy restriction and exercise combination in obese PCOS-prone animals significantly increased plasma sex-hormone binding globulin, hypothalamic cocaine-and amphetamine-regulated transcript (CART) and Kisspeptin mRNA expression to levels of the Lean-Control group, and this was further associated with improvements in estrous cyclicity. The combination of exercise and dietary energy restriction when initiated in early life exerts beneficial effects on cardiometabolic and reproductive indices in an obese PCOS-prone rodent model, and this may be associated with normalization of the hypothalamic neuropeptides, Kisspeptin and CART.
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada.
authors.forename: Abdoulaye
authors.initials: A
authors.lastname: Diane
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada.
authors.forename: Maria
authors.initials: M
authors.lastname: Kupreeva
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada.
authors.forename: Faye
authors.initials: F
authors.lastname: Borthwick
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada.
authors.forename: Spencer D
authors.initials: SD
authors.lastname: Proctor
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada.
authors.forename: W David
authors.initials: WD
authors.lastname: Pierce
authors.affiliation: Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada Metabolic and Cardiovascular Diseases LaboratoryAlberta Institute of Human Nutrition, Alberta Diabetes InstituteDepartment of SociologyUniversity of Alberta, Edmonton, AB, Canada donna.vine@ualberta.ca.
authors.forename: Donna F
authors.initials: DF
authors.lastname: Vine
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000818:Animals; D001835:Body Weight / Q000502:physiology; D031204:Caloric Restriction; D004032:Diet; D004195:Disease Models, Animal; D005260:Female; D007333:Insulin Resistance / Q000502:physiology; D008019:Life Style; D009765:Obesity / Q000378:metabolism* / Q000517:prevention & control; D010805:Physical Conditioning, Animal / Q000502:physiology*; D011085:Polycystic Ovary Syndrome / Q000378:metabolism*; D051381:Rats
keywords: CART; PCOS; cardiometabolic risk; endocrine; energy restriction; estrous cyclicity; hypothalamic neuropeptides; kisspeptin