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PMID |
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8692797
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We cloned a long isoform of the wild-type leptin receptor that is preferentially expressed in the hypothalamus and show that it can activate signal transducers and activators of transcription (STAT)-3, STAT-5, and STAT-6.
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8692797
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These data provide further evidence that the mutation in OB-R causes the db/db phenotype and identify three STAT proteins as potential mediators of the anti-obesity effects of leptin.
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9519716
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Recent studies demonstrated that leptin receptor mRNA is expressed in pancreatic islets of rodents and that leptin at relatively high doses inhibits glucose-induced insulin secretion from rat islets.
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4 |
11260392
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We postulate that increased leptin levels may transmit a signal through the short-form leptin receptor to up-regulate TbetaRII and activate the intraglomerular TGF-beta system, which may contribute to the glomerulosclerosis of obesity or type 2 diabetes.
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5 |
11532192
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Homozygosity for a null allele of the carbonic anhydrase II gene (Car2n) does not alter IOP while homozygosity for a mutation in the leptin receptor gene (Leprdb) that causes obesity and diabetes results in increased IOP.
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6 |
12423202
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We now demonstrate that the activation of the IL-1Ra promoter by leptin is strictly dependent on the presence of the long form of the leptin receptor (OB-Rb), and that it also requires the activation of the p42/44 mitogen-activated protein kinases (MAPKs) as well as the presence of a nuclear factor kappaB (NF-kappa B)/PU.1 composite site at position -80 of the IL-1Ra promoter.
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7 |
14500292
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Although Ki67 labeling demonstrated similar rates of replication in the neointima of leprdb/db mouse arteries, neointimal formation in leprdb/db mice was surprisingly reduced by approximately 90% compared with nondiabetic lepr+/+ mice.
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8 |
14962997
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The lack of effect of leptin on resistin in db/db mice indicated that the leptin inhibitory action on resistin expression requires the long leptin receptor isoform.
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9 |
15161768
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In whites, exercise increased insulin sensitivity index (P = 0.041) and disposition index (P = 0.046) in the LEPR 109R allele carriers but not in the K109K homozygotes, increased glucose disappearance index more in the R109R homozygotes than in the K109 allele carriers (P = 0.039), and decreased fasting glucose only in the 109R allele carriers (P = 0.018).
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10 |
15161768
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We also found an interaction between the LEP A19G and LEPR K109R polymorphisms on the change in fasting insulin in whites (P = 0.010).
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11 |
15161768
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The association between the LEP A19G polymorphism and the change in insulin was evident only in the LEPR 109R carriers (P = 0.019).
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12 |
15161768
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The decrease in insulin was strongest in the LEP A19A homozygotes who carried the LEPR 109R allele.
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13 |
15950750
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Insulin alone down-regulated the leptin signaling pathway, JAK-2 association with ObR decreased at all time-points, and JAK-2 phosphorylation decreased similarly.
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14 |
15950750
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Leptin alone also appeared to down-regulate JAK-2 association with the ObR, but stimulated the down-regulated pathway to signal, JAK-2 tyrosine phosphorylation being increased at later time-points.
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15 |
15950750
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Pretreatment with leptin followed by insulin time-course showed marked up-regulation of the early leptin signaling pathway, JAK-2 association with the ObR being increased by insulin while JAK-2 tyrosine phosphorylation was also increased.
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16 |
17023536
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Signal transducer and activator of transcription 3 (Stat3) is an important intracellular signaling molecule activated by leptin, and previous studies have shown that mice carrying a mutated leptin receptor that abolished Stat3 binding are grossly obese.
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17 |
17387171
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C/EBPbeta deletion in Lepr(db/db) mice down-regulated peroxisome proliferator-activated receptor gamma2 (PPARgamma2) and stearoyl-CoA desaturase-1 and up-regulated PPARalpha independent of SREBP1c.
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18 |
17603293
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In conclusion, these findings suggest that, in mice, swim training can effectively prevent body weight gain, adiposity and lipid disorders caused by leptin receptor deficiency, in part through activation of UCPs in adipose tissue and skeletal muscle, which may contribute to alleviating metabolic syndromes, such as obesity, hyperlipidemia and type 2 diabetes.
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19 |
17705360
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Protein tyrosine phosphatase 1B (PTP1B) is a negative regulator of the insulin and leptin receptor pathways and thus an attractive therapeutic target for diabetes and obesity.
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20 |
18413223
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The objective of this study was to investigate the influence of Lys656Asn polymorphism in the LEPR gene on serum insulin, glucose values, and insulin resistance in the fasted state among obese men and women without diabetes mellitus.
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21 |
19913498
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However, LEP -2548GG genotype appear to be important in regulating leptin levels, whereas the LEPR 223R allele might predispose healthy subjects to develop metabolic disturbances.
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22 |
20592105
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Indeed, leptin receptor mRNA expression was significantly reduced in the lungs of obese mice, whereas suppressor of cytokine signaling (Socs)1 and Socs3 mRNA expression were increased.
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23 |
20668022
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Reduced body weight persisted and was associated with increased ARC leptin receptor binding and sensitivity to the anorectic effects of leptin, reduced adiposity, and enhanced insulin sensitivity in LL DIO rats fed chow until 10 wk of age.
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24 |
20814014
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Adiponectin protein expression was significantly reduced, and TNF-? protein expression was significantly greater, in coronary arterioles and aortas of Lepr(db) compared with control mice.
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25 |
20814014
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Anti-TNF-? treatment upregulated adiponectin protein expression in Lepr(db) coronary arterioles and aortas.
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26 |
20814014
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Adiponectin administration reduced TNF-? protein expression in Lepr(db).
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27 |
20814014
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Although adiponectin receptor 1 protein expression in coronary arterioles and aortas was similar between control and diabetic mice, adiponectin receptor 2 protein expression was significantly reduced in Lepr(db).
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28 |
21056997
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Leptin receptor-free tumor cells display reduced STAT3 tyrosine phosphorylation on residue Y705 but have increased serine phosphorylation on residue S727, consistent with preserved mitochondrial function in the absence of the leptin receptor.
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29 |
21037323
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Reduced expression of Fto or Rpgrip1l affects leptin receptor isoform b trafficking and leptin signaling in N41 mouse hypothalamic or N2a neuroblastoma cells in vitro.
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30 |
21037323
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Leptin receptor clusters in the vicinity of the cilium of arcuate hypothalamic neurons in C57BL/6J mice treated with leptin, but not in fasted mice, suggesting a potentially important role of the cilium in leptin signaling that is, in part, regulated by FTO and RPGRIP1L.
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31 |
21037323
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P200 disrupts (whereas P110 promotes) leptin receptor isoform b clustering in the vicinity of the cilium in vitro.
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32 |
19768241
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The main interactions among genetic polymorphisms and diet were: for obesity: interleukin-6 (IL-6) with daily intake; peroxisome proliferator-activated receptor gamma 2 (PPAR-gama2) and fat mass and obesity associated (FTO) with fat intake; beta-adrenergic receptor 2 (ADRB2) and melanocortin receptor 4 (MCR4) with carbohydrate intake; or reduction in body weight: uncoupling proteins (UCPs) with restriction of energy; for leptinemia: leptin receptor (LEPR) with restriction of energy; for diabetes mellitus: PPAR-gama2 with fat intake; for hypertriglyceridemia: fatty acid-binding protein 2 (FABP2) with fat intake.
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33 |
20068132
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We inserted sequences encoding a truncated LepRb mutant (LepRb(Delta65c), which activates Jak2 normally, but is devoid of other LepRb intracellular sequences) into the mouse Lepr locus.
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34 |
20068134
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Unexpectedly, Socs3 upregulation in leptin receptor neurons results in increased expression of STAT3 protein in mutant hypothalami, but does not lead to obesity.
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35 |
9166685
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A functional role for the beta-cell leptin receptor is indicated by our observation that leptin (100 ng/ml) suppressed the secretion of insulin from islets isolated from ob/ob mice.
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36 |
10022436
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Previously we demonstrated the expression of the long form of the leptin receptor in rodent pancreatic beta-cells and an inhibition of insulin secretion by leptin via activation of ATP-sensitive potassium channels.
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37 |
21352814
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Leptin (10 nM) was sufficient to inhibit the adipocyte differentiation, which seemed to come from increased expression of leptin receptor genes in the fat of TallyHO mice.
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38 |
17185651
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Intratracheal pretreatment with a leptin receptor inhibitor attenuated leptin-induced lung edema.
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39 |
21680729
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They study growth of these cancer cells in the context of obese animals, such as ob/ob mice (lacking leptin) and db/db mice (lacking functional leptin receptors (LEPR)) and find that leptin triggers LEPR-positive cancer stem cell differentiation, thereby promoting tumor cell survival.
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40 |
20675566
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Both Lepr(db) mice null for TNF-? (db(TNF-)/db(TNF-) mice) and Lepr(db) mice treated with the NF-?B inhibitor MG-132 showed decreased NAD(P)H oxidase activity and iNOS expression as well as elevated eNOS expression, whereas m-Lepr(db) mice treated with TNF-? showed the opposite effects.
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41 |
17556363
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Direct control of leptin receptor expression by insulin could also be demonstrated in isolated hepatocytes from normal mice.
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42 |
17556363
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Thus, insulin signaling in the liver plays an important role in control of leptin receptor expression and shedding.
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43 |
19150989
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Here, we show that BBS proteins are required for leptin receptor (LepR) signaling in the hypothalamus.
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44 |
19150989
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In contrast, downstream melanocortin receptor signaling is unaffected, indicating that LepR signaling is specifically impaired in Bbs2(-/-), Bbs4(-/-) and Bbs6(-/-) mice.
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45 |
19150989
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Impaired LepR signaling in BBS mice was associated with decreased Pomc gene expression.
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46 |
19150989
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Furthermore, we found that BBS1 protein physically interacts with the LepR and that loss of BBS proteins perturbs LepR trafficking.
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