title: Gene expression of paired abdominal adipose AQP7 and liver AQP9 in patients with morbid obesity: relationship with glucose abnormalities.
abstract: The trafficking of glycerol from adipose and hepatic tissue is mainly mediated by 2 aquaporin channel proteins: AQP7 and AQP9, respectively. In rodents, both aquaporins were found to act in a coordinated manner. The aim was to study the relationship between adipose AQP7 and hepatic AQP9 messenger RNA expression and the presence of glucose abnormalities simultaneously in morbid obesity. Adipose tissue (subcutaneous [SAT] and visceral [VAT]) and liver biopsies from the same patient were obtained during bariatric surgery in 30 (21 male and 9 female) morbidly obese subjects. Real-time quantification of AQP7 in SAT and VAT and hepatic AQP9 gene expression were performed. A 75-g oral glucose tolerance test was performed in all subjects. The homeostasis model assessment of insulin resistance and lipidic profile were also determined. Visceral adipose tissue AQP7 expression levels were significantly higher than SAT AQP7 (P = .009). Subcutaneous adipose tissue AQP7 positively correlated with both VAT AQP7 and hepatic AQP9 messenger RNA expression (r = 0.44, P = .013 and r = 0.45, P = .012, respectively). The correlation between SAT AQP7 and liver AQP9 was stronger in intolerant and type 2 diabetes mellitus subjects (r = 0.602, P = .011). We have found no differences in compartmental AQP7 adipose tissue distribution or AQP9 hepatic gene expression according to glucose tolerance classification. The present study provides, for the first time, evidence of coordinated regulation between adipose aquaglyceroporins, with a greater expression found in visceral fat, and between subcutaneous adipose AQP7 and hepatic AQP9 gene expression within the context of human morbid obesity.
authors.affiliation: Unitat de Recerca, Hospital Universitari de Tarragona Joan XXIII, IISPV, 43007 Tarragona, Spain. mmiranda.hj23.ics@gencat.cat
authors.forename: Merce
authors.initials: M
authors.lastname: Miranda
authors.forename: Victòria
authors.initials: V
authors.lastname: Ceperuelo-Mallafré
authors.forename: Albert
authors.initials: A
authors.lastname: Lecube
authors.forename: Cristina
authors.initials: C
authors.lastname: Hernandez
authors.forename: Matilde R
authors.initials: MR
authors.lastname: Chacon
authors.forename: Jose M
authors.initials: JM
authors.lastname: Fort
authors.forename: Lluís
authors.initials: L
authors.lastname: Gallart
authors.forename: Juan A
authors.initials: JA
authors.lastname: Baena-Fustegueras
authors.forename: Rafael
authors.initials: R
authors.lastname: Simó
authors.forename: Joan
authors.initials: J
authors.lastname: Vendrell
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000328:Adult; D000886:Anthropometry; D020346:Aquaporins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D015992:Body Mass Index; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics / Q000378:metabolism; D005260:Female; D015870:Gene Expression / Q000187:drug effects*; D005947:Glucose / Q000378:metabolism*; D018149:Glucose Intolerance / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics
chemical_list: C114141:AQP7 protein, human; C109669:AQP9 protein, human; D020346:Aquaporins; D012333:RNA, Messenger; D005947:Glucose