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Release and Regulation of Leptin, Resistin and Adiponectin From 457 Release and regulation of leptin, resistin and adiponectin from human placenta, fetal membranes, and maternal adipose tissue and skeletal muscle from normal and gestational diabetes mellitus-complicated pregnancies Martha Lappas, Kirin Yee, Michael Permezel and Gregory E Rice Department of Obstetrics and Gynaecology, University of Melbourne and Mercy Perinatal Research Centre, Mercy Hospital for Women, 126 Clarendon Street, East Melbourne, 3002 Victoria, Australia (Requests for offprints should be addressed to M Lappas; Email: [email protected]) Abstract The aim of this study was to determine the release and compared with women with GDM. However, in maternal regulation of leptin, resistin and adiponectin from human tissues, the situation was reversed, with adipose tissue and placenta and fetal membranes, and maternal subcutaneous skeletal muscle obtained from women with GDM releas- adipose tissue and skeletal muscle obtained from normal ing significantly greater amounts of leptin. In adipose and gestational diabetes mellitus (GDM)-complicated tissue and skeletal muscle the release of leptin was signifi- pregnancies at the time of Cesarean section. Tissue cantly greater in insulin-controlled GDM compared with explants were incubated in the absence (basal control) or diet-controlled GDM, and leptin release from adipose presence of 10 µg/ml lipopolysaccharide (LPS), 10, 20 or tissue was significantly correlated with maternal body mass 40 ng/ml tumor necrosis factor- (TNF-), interleukin index. In all tissues tested, there was no effect of incu- (IL)-6 and IL-8, 1 µM phorbol myristate acetate, 10, 20 bation with LPS, IL-6, IL-8 or TNF- on leptin, resistin and 40 mM glucose, 0·1, 1 and 10 µM insulin and 0·1 1 or adiponectin release. PMA significantly increased the and 10 µM dexamethasone, progesterone and estrogen. release of resistin from placenta and adipose tissue. Insulin After an 18-h incubation, the medium was collected and increased placental resistin release, whereas the hormones the release of leptin, resistin and adiponectin was quanti- dexamethasone, progesterone and estrogen significantly fied by ELISA. Human gestational tissues and maternal decreased placental resistin release. The data presented in tissues released immunoreactive leptin, resistin and adi- this study demonstrate that dysregulation of leptin metab- ponectin; however, there was no difference in the release olism and/or function in the placenta may be implicated in of either resistin or adiponectin between normal pregnant the pathogenesis of GDM. Furthermore, resistin release is women and women with gestational diabetes. The release greatly affected by a variety of inflammatory mediators and of leptin was significantly higher in placenta, amnion and hormones. choriodecidua obtained from normal pregnant women Journal of Endocrinology (2005) 186, 457–465 Introduction tissues, adipose tissue is the principal site of leptin produc- tion and the major determinant of the level of circulating Recent investigations have focused on several new poten- hormone (Wauters et al. 2000). The functions attributed tial mediators of insulin resistance including leptin, resistin to leptin are extensive, including the regulation of food and adiponectin. Leptin, resistin and adiponectin are intake and energy balance through central hypothalamic known to be produced within the intrauterine environ- pathways, acting as a major signal to the reproductive ment (Masuzaki et al. 1997, Lea et al. 2000, Lepercq et al. system, inhibition of insulin secretion by pancreatic 2001, Akerman et al. 2002, Lindsay et al. 2003, Yura et al. -cells, and stimulation of glucose transport (reviewed in 2003); however their expression and regulation in gesta- Wauters et al. 2000). Leptin is produced in the human tional tissues and in relation to gestational diabetes mellitus placenta and is secreted into both the maternal and fetal (GDM) remains to be fully elucidated. circulation (Masuzaki et al. 1997). Expression of leptin has Leptin was originally discovered as a protein involved in been identified in placenta, chorionic villi, chorion laeve the development of obesity, and although it is now and amnion (Akerman et al. 2002). Human leptin mRNA recognized as a hormone that is produced by several and protein are also localized to the villous vascular Journal of Endocrinology (2005) 186, 457–465 DOI: 10.1677/joe.1.06227 0022–0795/05/0186–457 2005 Society for Endocrinology Printed in Great Britain Online version via http://www.endocrinology-journals.org Downloaded from Bioscientifica.com at 10/02/2021 03:18:29PM via free access 458 M LAPPAS and others · Leptin, resistin and adiponectin in human pregnancy endothelial cells, which are in direct contact with the membranes (amnion and choriodecidua), and maternal fetal blood (Lea et al. 2000). Both long and short leptin subcutaneous adipose tissue and skeletal muscle tissue from receptor (Ob-R) isoforms are present in placenta, and are normal pregnant women and women with GDM. co-localized with leptin to the syncytiotrophoblast at the maternal interface (Bodner et al. 1999, Lea et al. 2000), implicating a potential autocrine or paracrine effect of Materials and Methods leptin on placental function. Resistin is a recently discovered protein that is secreted Reagents by adipocytes, and is thought to impair glucose tolerance (Steppan et al. 2001). Resistin induces severe hepatic, but All chemicals were purchased from BDH Chemicals not peripheral, insulin resistance. Furthermore, initial Australia (Melbourne, Victoria, Australia) unless otherwise studies demonstrated that resistin is up-regulated in both stated. RPMI 1640 (glucose free) was obtained from genetic and diet-induced obesity in vivo and down- Gibco Laboratories (Grand Island, NY, USA). BSA (RIA regulated by the anti-diabetic agents, the thiazolidine- grade), dexamethasone (water soluble), estrogen (water diones (TZDs) (Steppan et al. 2001). These studies by soluble), human recombinant IL-6, IL-8 and TNF- , Steppan and colleagues led to the hypothesis that resistin insulin (from bovine pancreas), lipopolysaccharide (LPS), might be a link between obesity and diabetes, as well as a -NADH (disodium salt), 3,3 ,5,5 -tetramethylbenzidine candidate to explain the anti-diabetic effects of TZDs. (TMB), progesterone (water soluble) and pyruvic acid However, subsequent studies have failed to show an (dimer free) were supplied by Sigma (St Louis, MO, association with resistin and diabetes. In particular, it is not USA). PMA and 4 -PMA were purchased from Tocris clear whether human adipocytes express substantial (Ellisville, MO, USA). The leptin kit was supplied by amounts of resistin mRNA and protein, and studies on the Biosource International (Camarillo, CA, USA). The resis- regulation of resistin are contradictory (reviewed in tin and adiponectin ELISA kits were supplied by CytoLab Fasshauer & Paschke 2003). (Rehovot, Israel) and R&D Systems (Minneapolis, MN, Adiponectin is another protein that is secreted by USA) respectively. adipocytes, and is postulated to play a role in the modu- lation of glucose and lipid metabolism in insulin-sensitive Patients and samples tissues in both humans and animals. In humans, plasma adiponectin concentrations exceed those of any other Human placenta with attached fetal membranes, subcuta- hormone by a thousand times; they decrease in insulin- neous adipose tissue (from the anterior abdominal wall), resistant states including type II diabetes mellitus, and are skeletal muscle (pyramidalis, small muscle of the anterior positively associated with whole-body insulin sensitivity abdomen wall), and maternal blood were obtained from a (Hu et al. 1996, Weyer et al. 2001). total of 30 pregnant women (15 normal and 15 with Leptin and adiponectin levels are dysregulated in patho- GDM) who delivered healthy, singleton infants at term logical conditions such as GDM, pre-eclampsia and intra- (>37 weeks gestation) undergoing elective Cesarean uterine growth restriction, representing an effect or a cause section (indications for Cesarean section were breech of disturbances in the feto/placento/maternal unit (Festa presentation and/or previous Cesarean section). Women et al. 1999, Lea et al. 2000, Lepercq et al. 2001, Chan et al. with GDM were diagnosed according to the criteria of the 2003, Pighetti et al. 2003, Ranheim et al. 2004, Williams Australasian Diabetes in Pregnancy Society by either a et al. 2004). Furthermore, a variety of hormones, cytokines fasting venous plasma glucose level of d5·5 mmol/l and inflammatory stimuli have also been shown to regulate glucose, and/or d8·0 mmol/l glucose 2 h after a 75 g oral leptin, resistin and adiponectin expression and release. glucose load. Approval for this study was obtained from Therefore, we hypothesize that the release of leptin, the Mercy Hospital for Women’s Research and Ethics resistin and adiponectin may be affected by a number of Committee and informed consent was obtained from all factors, including GDM, glucose, and hormones and participating subjects. inflammatory stimuli known to affect insulin sensitivity. Therefore, the main purpose of this study was to investi- gate the release and regulation of leptin, resistin and Tissue explants adiponectin from placenta, fetal membranes, adipose tissue Tissues were obtained within 10 min of delivery and and skeletal muscle. A well characterized tissue explant dissected fragments were placed in ice-cold PBS. Tissues system is used to determine the effect of cytokine stimu- were dissected
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