A nontargeted study of muscle proteome in severely obese women with androgen excess compared with severely obese men and nonhyperandrogenic women

• Published in: European journal of endocrinology Vol. 174; no. 3; pp. 389 - 398
• Main Authors: Insenser, María, Montes-Nieto, Rafael, Martínez-García, M Ángeles, Escobar-Morreale, Héctor F
• Format: Journal Article
• Language: English
• Published: England Bioscientifica Ltd 01.03.2016
• Subjects: Adult; Bariatric Surgery; Case-Control Studies; Clinical Study; Creatine Kinase, MM Form - metabolism; Desmin - metabolism; Electrophoresis, Gel, Two-Dimensional; Female; Glycerolphosphate Dehydrogenase - metabolism; Glycogen Phosphorylase - metabolism; Humans; Hyperandrogenism - metabolism; Male; Mass Spectrometry; Muscle, Skeletal - metabolism; Obesity, Morbid - metabolism; Obesity, Morbid - surgery; Phosphopyruvate Hydratase - metabolism; Proteome - metabolism; Proteomics; Pyruvate Kinase - metabolism; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
• ISSN: 0804-4643; 1479-683X
• DOI: 10.1530/EJE-15-0912

ObjectiveAndrogen excess in women is frequently associated with muscle insulin resistance, especially in obese women with polycystic ovary syndrome. However, whether this is a primary event or the result of indirect mechanisms is currently debated.DesignThis is an observational study.MethodsWe obtained skeletal muscle biopsies during bariatric surgery from severely obese men (n=6) and women with (n=5) or without (n=5) androgen excess. We used two-dimensional differential gel electrophoresis and matrix-assisted laser desorption/ionization-time-of-flight/time-of-flight mass spectrometry to identify muscle proteins showing differences in abundance between the groups of obese subjects.ResultsWomen with hyperandrogenism presented the lowest abundances of glycogen phosphorylase, pyruvate kinase, β-enolase, glycerol-3-phosphate dehydrogenase, creatine kinase M-type, and desmin, whereas the abundances of these molecules were similar in control women and men.ConclusionAccording to our nontargeted proteomic approach, women with hyperandrogenism show a specific alteration of the skeletal muscle proteome that could contribute to their insulin resistance. Because men do not show similar results, this alteration does not appear to be the direct effect on muscle of androgen excess, but rather the consequence of indirect mechanisms that merit further studies.