OBJECTIVE: Polycystic ovarian syndrome (PCOS) is associated with skeletal muscle insulin resistance (IR), which has been linked to decreased mitochondrial function. We measured mitochondrial respiration in lean and obese women with and without PCOS using high-resolution respirometry. METHODS: Hyperinsulinemic-euglycemic clamps (40 mU/min per m(2)) and muscle biopsies were performed on 23 women with PCOS (nine lean (body mass index (BMI) <25 kg/m(2)) and 14 obese (BMI >25 kg/m(2))) and 17 age- and weight-matched controls (six lean and 11 obese). Western blotting and high-resolution respirometry was used to determine mitochondrial function. RESULTS: Insulin sensitivity decreased with PCOS and increasing body weight. Mitochondrial respiration with substrates for complex I and complex I+II were similar in all groups, and PCOS was not associated with a decrease in mitochondrial content as measured by mitochondrial DNA/genomic DNA. We found no correlation between mitochondrial function and indices of insulin sensitivity. CONCLUSIONS: In contrast to previous reports, we found no evidence that skeletal muscle mitochondrial respiration is reduced in skeletal muscle of women with PCOS compared with control subjects. Furthermore, mitochondrial content did not differ between our control and PCOS groups. These results question the causal relationship between reduced mitochondrial function and skeletal muscle IR in PCOS.
OBJECTIVE:Polycystic ovarian syndrome (PCOS) is associated with skeletal muscle insulin resistance (IR), which has been linked to decreased mitochondrial function. We measured mitochondrial respiration in lean and obesewomen with and without PCOS using high-resolution respirometry. METHODS:Hyperinsulinemic-euglycemic clamps (40 mU/min per m(2)) and muscle biopsies were performed on 23 women with PCOS (nine lean (body mass index (BMI) <25 kg/m(2)) and 14 obese (BMI >25 kg/m(2))) and 17 age- and weight-matched controls (six lean and 11 obese). Western blotting and high-resolution respirometry was used to determine mitochondrial function. RESULTS: Insulin sensitivity decreased with PCOS and increasing body weight. Mitochondrial respiration with substrates for complex I and complex I+II were similar in all groups, and PCOS was not associated with a decrease in mitochondrial content as measured by mitochondrial DNA/genomic DNA. We found no correlation between mitochondrial function and indices of insulin sensitivity. CONCLUSIONS: In contrast to previous reports, we found no evidence that skeletal muscle mitochondrial respiration is reduced in skeletal muscle of women with PCOS compared with control subjects. Furthermore, mitochondrial content did not differ between our control and PCOS groups. These results question the causal relationship between reduced mitochondrial function and skeletal muscle IR in PCOS.
Authors: Melanie Cree-Green; Bradley R Newcomer; Gregory Coe; Lindsey Newnes; Amy Baumgartner; Mark S Brown; Laura Pyle; Jane E Reusch; Kristen J Nadeau Journal: Am J Physiol Endocrinol Metab Date: 2015-02-24 Impact factor: 4.310
Authors: Adam R Konopka; Albert Asante; Ian R Lanza; Matthew M Robinson; Matthew L Johnson; Chiara Dalla Man; Claudio Cobelli; Mark H Amols; Brian A Irving; K S Nair Journal: Diabetes Date: 2015-01-20 Impact factor: 9.461
Authors: Alba Moreno-Asso; Ali Altıntaş; Luke C McIlvenna; Rhiannon K Patten; Javier Botella; Andrew J McAinch; Raymond J Rodgers; Romain Barrès; Nigel K Stepto Journal: J Mol Endocrinol Date: 2021-12-03 Impact factor: 5.098
Authors: Kelsey H Fisher-Wellman; Todd M Weber; Brook L Cathey; Patricia M Brophy; Laura A A Gilliam; Constance L Kane; Jill M Maples; Timothy P Gavin; Joseph A Houmard; P Darrell Neufer Journal: Diabetes Date: 2013-08-23 Impact factor: 9.461
Authors: Antti-Pekka E Rissanen; Tiina Koskela-Koivisto; Harriet Hägglund; Anne S Koponen; Jyrki M Aho; Maritta Pöyhönen-Alho; Aila Tiitinen; Heikki O Tikkanen; Juha E Peltonen Journal: Physiol Rep Date: 2016-02