In an effort to understand the genetics of human obesity, we have studied the physiology and molecular genetics of rodent models with monogenetic forms of obesity including the leptin gene-defective ( Lepob / Lepob ) and leptin receptor gene-defective ( Leprdb / Leprdb ) mouse. In the experiments reported here, we investigated the effects of heterozygosity at Lepob and Leprdb on body compositio...

The role of expression and secretion of the ob gene product, leptin, for the regulation of plasma leptin levels has been investigated in vitro using abdominal subcutaneous adipose tissue of 20 obese, otherwise healthy, and 11 nonobese women. Body mass index (BMI, mean+/-SEM; kg/m2) in the two groups was 41+/-2 and 23+/-1, respectively. Fat cell volume was 815+/-55 pl in the obese and 320+/-46 p...

Background: Leptin, the hormonal product of the obese (ob) gene, circulates in the blood at levels paralleling those of fat reserves and regulates satiety. In cattle, leptin has also been implicated in the control of ovarian function, but its local production in the ovary and role in the control of ovarian function in autocrine/paracrine manner is unknown. The aims of this study were to documen...

background: potential association of leptin (lep) gene polymorphisms has been suggested in the processes leading to breast cancer initiation and progression. we investigated whether genetic variations in the lep -2548g/a gene are associated with risk of breast cancer. methods: this case-control study consisted of 100 breast cancer cases and 100 control subjects without breast cancer that matche...

The obesity gene (ob) in mice encodes a protein produced by adipose tissue, leptin, which regulates body weight (3). Under experimental conditions, leptin affects the central nervous system and tends to reduce appetite and increase energy expenditure. Numerous studies have shown an increased expression of the ob gene (mRNA-leptin) in adipocytes or a marked increase in serum leptin concentration...

Several inflammatory cytokines, most notably tumor necrosis factor (TNF) and IL-1, induce anorexia and loss of lean body mass, common manifestations of acute and chronic inflammatory conditions. In C57BL/6 female mice, the administration of TNF, IL-1, and, to a lesser extent, leukemia inhibitory factor (LIF), produced a prompt and dose-dependent increase in serum leptin levels and leptin mRNA e...

The aim of this study was to investigate the relationship between the leptin receptor (LEPR) polymorphism/serum leptin level and preeclampsia. The prevalence of a single nucleotide polymorphism in the LEPR gene exon 14 at -656 and the serum leptin concentrations in 97 preeclamptic pregnant mothers were compared to those of 110 healthy controls. The Lys656Asn genotype and Lys656Asn + Asn656Asn f...

Leptin is a circulating pleiotropic hormone that play an important role in appetite control, fat metabolism, regulation of body weight, fetus growth, growth and aging of adults and hematopoiesis. It is expressed abundantly and specifically in the adipose tissue. A liver cell with developed steatosis represents a cell metabolism similar to metabolism of cells of adipose tissue. Analyses of serum...

Leptin is a peripheral immunoenhancing reagent that directly activates splenic lymphocytes in mice. We found that a 48 h fast in rats resulted in a decrease in serum leptin that was accompanied by a lower delayed-type hypersensitivity (DTH) response. Peripheral leptin replacement completely restored this response in fasted animals. We employed a recombinant adeno-associated virus (rAAV) system ...

Problem statement: Glucocorticoid-induced ob gene over-expression and resulted hyperleptinemia may lead to adverse consequences especially on cardiovascular system; therefore, the present study was conducted to evaluate the effects of niacin on hyperleptinemia and ob gene overexpression due to dexamethasone administration in rats. Approach: Twenty four adult male rats divided randomly into four...