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Endocrinology

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https://www.readbyqxmd.com/read/28324019/no-mediated-regulation-of-glut-by-t3-and-fsh-in-rat-granulosa-cells
#1
Ye Tian, Yu Ding, Juan Liu, Dai Heng, Kaili Xu, Wenbo Liu, Cheng Zhang
Thyroid hormones (THs) are important for normal reproductive function. Although 3,5,3'-triiodothyronine (T3) enhances follicle-stimulating hormone (FSH)-induced preantral follicle growth and granulosa cells development in vitro, little is known about the molecular mechanisms regulating ovarian development via glucose. In this study, we investigated whether and how T3 combines with FSH to regulate glucose transporter protein (GLUT) expression and glucose uptake in granulosa cells. Here, we present evidence that T3 and FSH co-treatment significantly increased GLUT-1/GLUT-4 expression, and translocation in cells, as well as glucose uptake...
March 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323980/hypoxia-inducible-lipid-droplet-associated-hilpda-is-not-a-direct-physiological-regulator-of-lipolysis-in-adipose-tissue
#2
Wieneke Dijk, Frits Mattijssen, Montserrat de la Rosa Rodriguez, Angel Loza Valdes, Anne Loft, Susanne Mandrup, Eric Kalkhoven, Ling Qi, Jan Willem Borst, Sander Kersten
Triglycerides are stored in specialized organelles called lipid droplets. Numerous proteins have been shown to be physically associated with lipid droplets and govern their function. Previously, hypoxia-inducible lipid droplet-associated (HILPDA) was localized to lipid droplets and was suggested to inhibit triglyceride lipolysis in hepatocytes. We confirm the partial localization of HILPDA to lipid droplets and show that HILPDA is highly abundant in adipose tissue, where its expression is controlled by the peroxisome proliferator-activated receptor γ and by β-adrenergic stimulation...
March 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323972/neurosecretory-protein-gl-a-hypothalamic-small-secretory-protein-participates-in-energy-homeostasis-in-male-mice
#3
Daichi Matsuura, Kenshiro Shikano, Takaya Saito, Eiko Iwakoshi-Ukena, Megumi Furumitsu, Yuta Ochi, Manami Sato, George E Bentley, Lance J Kriegsfeld, Kazuyoshi Ukena
We have recently identified a novel cDNA encoding a small secretory protein termed neurosecretory protein GL (NPGL) from the avian hypothalamus. In chicks, NPGL increases body weight gain without affecting food intake. A database search reveals that NPGL is conserved throughout vertebrates. However, the central distribution and functional role of NPGL remains to be elucidated in mammals. In this study, we identified the precursor cDNA encoding NPGL from the mouse hypothalamus. Quantitative RT-PCR and morphological analyses revealed that NPGL precursor mRNA is robustly expressed in the mediobasal hypothalamus with NPGL neurons specifically localized to the lateroposterior part of the arcuate nucleus in the hypothalamus...
March 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324068/bisphenol-a-exposure-ovarian-follicle-numbers-and-female-sex-steroid-hormone-levels-results-from-a-clarity-bpa-study
#4
Shreya Patel, Emily Brehm, Liying Gao, Saniya Rattan, Ayelet Ziv-Gal, Jodi A Flaws
Bisphenol A (BPA) is an industrial chemical found in thermal receipts, and food and beverage containers. Previous studies have shown that BPA can affect the numbers and health of ovarian follicles and the production of sex steroid hormones, but they often did not include a wide-range of doses of BPA, used a small sample size, focused on relatively short-term exposures to BPA, and/or did not examine the consequences of chronic BPA exposure on the ovaries or steroid levels. Thus, this study was designed to examine the effects of a wide range of doses of BPA on ovarian morphology and sex steroid hormone production...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324017/a-novel-selective-bombesin-receptor-subtype-3-agonist-promotes-weight-loss-in-male-diet-induced-obese-rats-with-circadian-rhythm-change
#5
Yasunori Nio, Natsu Hotta, Minoru Maruyama, Kenichi Hamagami, Toshimi Nagi, Masaaki Funata, Junichi Sakamoto, Masanori Nakakariya, Nobuyuki Amano, Tomohiro Okawa, Yasuyoshi Arikawa, Shinobu Sasaki, Shoki Okuda, Shizuo Kasai, Yugo Habata, Yasutaka Nagisa
Bombesin receptor subtype 3 (BRS-3) is an orphan G-protein-coupled receptor. Based on the obese phenotype of male BRS-3-deficient mice, BRS-3 has been considered an attractive target for obesity treatment. Here, we developed a novel selective BRS-3 agonist (Compound-A) and evaluated its anti-obesity effects. Compound-A showed anorectic effects and enhanced energy expenditure in diet-induced obese (DIO)-F344 rats. Moreover, repeated oral administration of Compound-A for 7 days resulted in a significant body weight reduction in DIO-F344 rats...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324007/aberrant-tgf-%C3%AE-signaling-drives-castration-resistant-prostate-cancer-in-a-male-mouse-model-of-prostate-tumorigenesis
#6
Hong Pu, Diane Begemann, Natasha Kyprianou
The androgen receptor (AR) plays a critical role as a driver of castration-resistant-prostate cancer (CRPC). Our previous studies demonstrated that disruption of transforming growth factor-β (TGF-β) signaling via introduction of dominant-negative TGF-β type II receptor (DNTGF-RβII) in the prostate epithelium of transgenic adenocarcinoma of the prostate (TRAMP) mice accelerated tumor. This study investigated the consequences of disrupted TGF-β signaling on prostate tumor growth under conditions of castration-induced androgen deprivation (ADT) in the pre-clinical model DNTGFβRII...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323954/heterogeneity-of-calcium-responses-to-secretagogues-in-corticotrophs-from-male-rats
#7
Nicola Romanò, Heather McClafferty, Jamie J Walker, Paul Le Tissier, Michael J Shipston
Heterogeneity in homotypic cellular responses is an important feature of many biological systems, and has been shown to be prominent in most anterior pituitary hormonal cell types. Here we analyse heterogeneity in the responses to hypothalamic secretagogues in the corticotroph cell population of adult male rats. Using the genetically-encoded calcium indicator GCaMP6s, we determined the intracellular calcium responses of these cells to CRH and AVP. Our experiments revealed marked population heterogeneity in the response to these peptides, in terms of amplitude and dynamics of the responses, as well as the sensitivity to different concentrations and duration of stimuli...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324069/glucose-homeostasis-regulation-by-peripheral-circadian-clocks-in-rodents-and-humans
#8
Frederic Gachon, Ursula Loizides-Mangold, Volodymyr Petrenko, Charna Dibner
Most organisms, including humans, have developed an intrinsic system of circadian oscillators, allowing the anticipation of events related to the rotation of the Earth around its own axis. The mammalian circadian timing system orchestrates nearly all aspects of physiology and behavior. Together with systemic signals, emanating from the central clock which resides in the hypothalamus, peripheral oscillators orchestrate tissue-specific fluctuations in gene expression, protein synthesis, and posttranslational modifications, driving overt rhythms in physiology and behavior...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324023/long-chain-free-fatty-acid-receptor-gpr120-mediates-oil-induced-gip-secretion-through-cck-in-male-mice
#9
Akiko Sankoda, Norio Harada, Kanako Iwasaki, Shunsuke Yamane, Yuki Murata, Kimitaka Shibue, Yotsapon Thewjitcharoen, Kazuyo Suzuki, Takanari Harada, Yoshinori Kanemaru, Satoko Shimazu-Kuwahara, Akira Hirasawa, Nobuya Inagaki
Free fatty acid receptors GPR120 and GPR40 are involved in the secretion of gut hormones. GPR120 and GPR40 are expressed in enteroendocrine K-cells and their activation induces the secretion of the incretin glucose-dependent insulinotropic polypeptide (GIP). However, the role of these receptors in fat-induced GIP secretion in vivo and the associated mechanisms are unclear. In this study, we investigated corn oil-induced GIP secretion in GPR120-knockout (GPR120-/-) and GPR40-knockout (GPR40-/-) mice. Oil-induced GIP secretion was reduced by 50% and 80% in GPR120-/- and GPR40-/- mice compared to that in wild-type (WT) mice, respectively...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323991/whole-body-vibration-mimics-the-metabolic-effects-of-exercise-in-male-leptin-receptor-deficient-mice
#10
Meghan E McGee-Lawrence, Karl H Wenger, Sudipta Misra, Catherine L Davis, Norman K Pollock, Mohammed Elsalanty, Kehong Ding, Carlos M Isales, Mark W Hamrick, Joanna R Erion, Marlena Wosiski-Kuhn, Phonepasong Arounleut, Mark P Mattson, Roy G Cutler, Jack C Yu, Alexis M Stranahan
Whole-body vibration has gained attention as a potential exercise mimetic, but direct comparisons with the metabolic effects of exercise are scarce. To determine whether whole-body vibration recapitulates the metabolic and osteogenic effects of physical activity, we exposed male wildtype (Wt) and leptin receptor deficient (db/db) mice to daily treadmill exercise or whole-body vibration for three months. Body weights were analyzed and compared with Wt and db/db mice that remained sedentary. Glucose and insulin tolerance testing revealed comparable attenuation of hyperglycemia and insulin resistance in db/db mice following treadmill exercise or whole-body vibration...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323968/impaired-glycine-mia-in-type-2-diabetes-and-potential-mechanisms-contributing-to-glucose-homeostasis
#11
Richard Yan-Do, Patrick E MacDonald
The onset and/or progression of type 2 diabetes (T2D) can be prevented if intervention is early enough. As such, much effort has been placed on the search for indicators predictive of pre-diabetes and disease onset or progression. An increasing body of evidence suggests that changes in plasma glycine may be one such biomarker. Circulating glycine levels are consistently low in patients with T2D. Levels of this non-essential amino acid correlate negatively with obesity and insulin resistance. Plasma glycine correlates positively with glucose disposal, and rises with interventions such as exercise and bariatric surgery that improve glucose homeostasis...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323956/hyperhomocysteinemia-promotes-insulin-resistance-and-adipose-tissue-inflammation-in-pcos-mice-through-modulating-m2-macrophage-polarization-via-estrogen-suppression
#12
Xinyu Qi, Bochun Zhang, Yue Zhao, Rong Li, Hsun-Ming Chang, Yanli Pang, Jie Qiao
It has been shown that serum homocycteine (Hcy) levels are higher in women with polycystic ovary syndrome (PCOS). However, the specific role of hyperhomocycteinemia (HHcy) in the development of PCOS has never been reported. Adipose tissue inflammation is featured by the infiltration of macrophages that plays a critical role in the pathogenesis of glucose and insulin intolerance. In this study, C57BL/6 mice were treated with dehydroepiandrosterone (DHEA) and/or high methionine diet to induce PCOS and HHcy mice models...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324024/thyroid-hormone-receptor-%C3%AE-controls-developmental-timing-and-regulates-the-rate-and-coordination-of-tissue-specific-metamorphosis-in-xenopus-tropicalis
#13
Luan Wen, Yuki Shibata, Dan Su, Liezhen Fu, Nga Luu, Yun-Bo Shi
Thyroid hormone (T3) receptor (TR) mediates the effects of T3 on organ metabolism and animal development. There are two TR genes, TRα and TRβ, in all vertebrates. During animal development, TRα expression is activated earlier than zygotic T3 synthesis and secretion into the plasma, implicating a developmental role of TRα both in the presence and absence of T3. Using T3-dependend amphibian metamorphosis as a model, we have previously proposed a dual functional model for TRs, in particular TRα, during development...
March 14, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323939/tac1-gene-products-regulate-pituitary-hormone-secretion-and-gene-expression-in-prepubertal-grass-carp-pituitary-cells
#14
Guangfu Hu, Mulan He, Wendy K W Ko, Anderson O L Wong
Tachykinin 1 (TAC1) is known to have diverse functions in mammals but similar information is scarce in lower vertebrates including fish species. Using grass carp as a model, the pituitary actions, receptor specificity and post-receptor signaling of TAC1 gene products, namely substance P (SP) and neurokinin A (NKA), were examined. As a first step, TAC1 encoding carp SP and NKA as well as tachykinin receptors NK1R and NK2R were cloned in carp pituitary. Expression studies revealed that the newly cloned receptors were functional and with pharmacological properties similar to mammalian counterparts...
March 13, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323938/loss-of-action-via-neurotensin-leptin-receptor-neurons-disrupts-leptin-and-ghrelin-mediated-control-of-energy-balance
#15
Juliette A Brown, Raluca Bugescu, Thomas Mayer, Adriana Gata-Garcia, Gizem Kurt, Hillary L Woodworth, Gina M Leinninger
The hormones ghrelin and leptin act via the lateral hypothalamic area (LHA) to modify energy balance but the underlying neural mechanisms remain unclear. We investigated how leptin and ghrelin engage LHA neurons to modify energy balance behaviors and whether there is any cross-talk between leptin and ghrelin-responsive circuits. We demonstrate that ghrelin activates LHA neurons expressing Hypocretin/Orexin (OX) to increase food intake. Leptin mediates anorectic actions via separate neurons expressing the long form of the leptin receptor (LepRb), many of which co-express the neuropeptide neurotensin (Nts); we refer to these as NtsLepRb neurons...
March 10, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323997/degradation-paradigm-of-the-gut-hormone-pancreatic-polypeptide-by-hepatic-and-renal-peptidases
#16
Joyceline Cuenco, James Minnion, Tricia Tan, Rebecca Scott, Natacha Germain, Yiin Ling, Rong Chen, Mohammad Ghatei, Stephen Bloom
Pancreatic polypeptide (PP) is a gut hormone that acts on Y4 receptors to reduce appetite. Obese humans display a reduced postprandial rise in PP and remain fully sensitive to the anorectic effects of exogenous PP. The utility of PP as an antiobesity treatment is limited by its short circulating half-life. Insight into the mechanisms by which PP is degraded may aid design of long-acting PP analogues.We aimed to investigate the role of peptidases in PP degradation with a view to determining whether inhibition of these enzymes enhanced PP plasma levels and bioactivity in vivo...
March 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323958/jmjd3-is-crucial-for-female-avpv-rip-cre-neuron-controlled-kisspeptin-estrogen-feedback-loop-and-reproductive-function
#17
Anying Song, Shujun Jiang, Qinghua Wang, Jianghuan Zou, Zhaoyu Lin, Xiang Gao
The hypothalamic-pituitary-gonadal axis controls development, reproduction, and metabolism. While most studies were focusing on the hierarch from brain to gonad, many questions remain unresolved concerning the feedback from gonad to the central nervous system, especially on the potential epigenetic modification in hypothalamic neurons. In this report, we generated genetically modified mice lacking histone H3 lysine 27 demethylase JMJD3 in hypothalamic RIP-Cre neurons. The female mutant mice display late-onset obesity due to reduced locomotor activity and decreased energy expenditure...
March 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323942/incretin-therapies-do-not-expand-%C3%AE-cell-mass-or-alter-pancreatic-histology-in-young-male-mice
#18
Aaron R Cox, Carol J Lam, Matthew M Rankin, Jacqueline S Rios, Julia Chavez, Claire W Bonnyman, Kourtney B King, Roger A Wells, Deepti Anthony, Justin X Tu, Jenny J Kim, Changhong Li, Jake A Kushner
The impact of incretins upon pancreatic β-cell expansion remains extremely controversial. Multiple studies indicate that incretin-based therapies can increase β-cell proliferation, and incretins have been hypothesized to expand β-cell mass. However, considerable disagreement exists on whether incretins actually increase β-cell mass. Moreover, some reports indicate that incretins may cause metaplastic changes in pancreatic histology. To resolve these questions we treated a large cohort of mice with incretin-based therapies and carried out a rigorous analysis of β-cell turnover and pancreatic histology using high-throughput imaging...
March 8, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323933/research-resource-transcriptional-dynamics-of-cultured-human-villous-cytotrophoblasts
#19
Joshua F Robinson, Mirhan Kapidzic, Matthew Gormley, Katherine Ona, Terrence Dent, Helia Seifikar, Emily G Hamilton, Susan J Fisher
During human pregnancy, cytotrophoblasts (CTBs) play key roles in uterine invasion, vascular remodeling, and anchoring of the feto-placental unit. Due to the challenges associated with studying human placentation in utero, cultured primary villous CTBs are used as a model of the differentiation pathway that leads to invasion of the uterine wall. In vitro, CTBs emulate in vivo cell behaviors, such as migration, aggregation and substrate penetration. While some of the molecular features related to these cell behaviors have been described, the underlying mechanisms, at a global level, remain undefined at mid-gestation...
March 8, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324012/deletion-of-the-thyroid-hormone-activating-type-2-deiodinase-rescues-cone-photoreceptor-degeneration-but-not-deafness-in-mice-lacking-type-3-deiodinase
#20
Lily Ng, Hong Liu, Donald L St Germain, Arturo Hernandez, Douglas Forrest
Type 2 deiodinase amplifies and type 3 deiodinase depletes levels of the active form of thyroid hormone, triiodothyronine (T3). Given the opposing activities of these enzymes, we tested the hypothesis that they counteract each other's developmental functions by investigating whether deletion of type 2 deiodinase (encoded by Dio2) modifies sensory phenotypes in type 3 deiodinase-deficient (Dio3-/-) mice. Dio3-/- mice display degeneration of retinal cones, the photoreceptors that mediate daylight and color vision...
March 7, 2017: Endocrinology
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