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Endocrinology

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https://www.readbyqxmd.com/read/29474539/mir-1224-5p-enhances-hepatic-lipogenesis-by-targeting-adenosine-monophosphate-activated-protein-kinase-%C3%AE-1-in-male-mice
#1
Tianxing Chen, Dong Yan, Xiaoying Cheng, XiaoJun Ji, Wu Yin
MicroRNAs are potential therapeutic targets for metabolic diseases. Here, miR-1224-5p was highly expressed in the livers of both high fat diet (HFD)-fed mice and obese (ob/ob) mice. To examine the potential role of miR-1224-5p, we constructed liver-specific adenoviral vectors expressing either an miR-1224-5p inhibitor sequence or miR-1224-5p mimic sequences. Following tail-vein vector injection, HFD-fed mice were examined for expression of lipogenic genes. We found that miR-1224-5p inhibitors significantly attenuated hepatic lipogenesis and steatosis in HFD-fed mice, while miR-1224-5p mimics promoted lipid accumulation in the liver of chow-fed C57BL/6 mice...
February 21, 2018: Endocrinology
https://www.readbyqxmd.com/read/29471404/the-war-on-the-placenta-the-differing-battles-of-high-fat-diet-and-obesity
#2
Angela Odle, Melody Allensworth-James, Gwen V Childs
No abstract text is available yet for this article.
February 20, 2018: Endocrinology
https://www.readbyqxmd.com/read/29471473/bidirectional-gpr119-agonism-requires-peptide-yy-and-glucose-for-activity-in-mouse-and-human-colon-mucosa
#3
Iain R Tough, Sarah Forbes, Herbert Herzog, Robert M Jones, Thue W Schwartz, Helen M Cox
The lipid sensor GPR119 is highly expressed by enteroendocrine L-cells and pancreatic β-cells that release the hormones, PYY and GLP-1, and insulin, respectively. Endogenous oleoylethanolamide (OEA) and the dietary metabolite, 2-monoacylglycerol (2-OG) can each activate GPR119. Here we compared mucosal responses to selective, synthetic GPR119 agonists (AR440006, AR231453) and the lipids, OEA, 2-OG and N-oleoyldopamine (OLDA) monitoring epithelial ion transport as a read-out for L-cell activity in native mouse and human gastrointestinal (GI) mucosae...
February 19, 2018: Endocrinology
https://www.readbyqxmd.com/read/29471436/antiandrogen-treatment-ameliorates-reproductive-and-metabolic-phenotypes-in-the-letrozole-induced-mouse-model-of-pcos
#4
Genevieve E Ryan, Shaddy Malik, Pamela L Mellon
Polycystic ovary syndrome (PCOS), the most common endocrinopathy in women of reproductive age, is characterized by hyperandrogenism, anovulation, and polycystic ovaries. Although its etiology is unknown, excess androgens are thought to be a critical factor driving the pathology of PCOS. We previously demonstrated that continuous exposure to the aromatase inhibitor letrozole (LET) in mice produces many hallmarks of PCOS, including elevated testosterone (T) and luteinizing hormone (LH), anovulation, and obesity...
February 19, 2018: Endocrinology
https://www.readbyqxmd.com/read/29471425/foxl2c134w-induced-cyp19-expression-via-cooperation-with-smad3-in-hgrc1-cells
#5
Martina Belli, Nahoko Iwata, Tomoko Nakamura, Akira Iwase, Dwayne Stupack, Shunichi Shimasaki
Germline knockout studies in female mice demonstrated an essential role for FOXL2 in early follicle development, while an inducible granulosa cell (GC) specific deletion of Foxl2 in adults has shown ovary-to-testis somatic sex reprogramming. In women, over 120 different germline mutations in the FOXL2 gene have been shown to cause blepharophimosis/ptosis/epicantus inversus syndrome associated with or without primary ovarian insufficiency. By contrast, a single somatic mutation (FOXL2C134W) accounts for almost all adult-type GC tumors (aGCTs)...
February 19, 2018: Endocrinology
https://www.readbyqxmd.com/read/29462303/snail-mediates-tgf-%C3%AE-1-induced-down-regulation-of-pentraxin-3-expression-in-human-granulosa-cells
#6
Hui Li, Hsun-Ming Chang, Zhendan Shi, Peter C K Leung
Transforming growth factor-β1 (TGF-β1) plays a critical role in regulating follicular development and its dysregulation has been shown to be involved in the pathogenesis of ovulation dysfunction. SNAIL is a well-known transcriptional repressor that mediates TGF-β1-induced cellular functions. Pentraxin 3 (PTX3) is a key enzyme for the assembly and stabilization of the cumulus oophorus extracellular matrix, which is essential for cumulus expansion during the periovulatory stage. The purpose of the present study was to investigate the roles of TGF-β1 and SNAIL in the regulation of PTX3 expression and to examine the underlying mechanism...
February 16, 2018: Endocrinology
https://www.readbyqxmd.com/read/29444261/selective-androgen-receptor-modulator-s42-suppresses-prostate-cancer-cell-proliferation
#7
Takako Kawanami, Tomoko Tanaka, Yuriko Hamaguchi, Takashi Nomiyama, Hajime Nawata, Tosihiko Yanase
We previously identified a novel selective androgen receptor modulator (SARM), S42, which does not stimulate prostate growth but has a beneficial effect on lipid metabolism. In the prostate cancer (PC) cell line LNCaP, S42 did not induce androgen receptor (AR) transactivation but antagonized 5α-dihydrotestosterone (DHT)-induced AR activation. Next, we investigated whether S42 suppresses the growth of PC cell lines. Basal growth of LNCaP cells was significantly suppressed by treatment with S42 compared with vehicle, as determined by cell counting and BrdU assays...
February 12, 2018: Endocrinology
https://www.readbyqxmd.com/read/29444258/modeling-the-influence-of-seasonal-differences-in-the-hpa-axis-on-synchronization-of-the-circadian-clock-and-cell-cycle
#8
Kamau Pierre, Rohit T Rao, Clara Hartmanshenn, Ioannis P Androulakis
Synchronization of biological functions to environmental signals enables organisms to anticipate and appropriately respond to daily external fluctuations and is critical to the maintenance of homeostasis. Misalignment of circadian rhythms with environmental cues is associated with adverse health outcomes. Cortisol, the downstream effector of hypothalamic-pituitary-adrenal (HPA) activity, facilitates synchronization of peripheral biological processes to the environment. Cortisol levels exhibit substantial seasonal rhythmicity, with peak levels occurring during the short-photoperiod winter months and reduced levels occurring in the long-photoperiod summer season...
February 12, 2018: Endocrinology
https://www.readbyqxmd.com/read/29444223/glp-1-receptor-expression-within-the-human-heart
#9
Laurie L Baggio, Bernardo Yusta, Erin E Mulvihill, Xiemin Cao, Catherine J Streutker, Jagdish Butany, Thomas P Cappola, Kenneth B Margulies, Daniel J Drucker
Glucagon-like peptide-1 receptor (GLP-1R) agonists, used to treat type 2 diabetes and obesity, reduce rates of myocardial infarction and cardiovascular death. The GLP-1R has been localized to the human sinoatrial node; however, its expression in ventricular tissue remains uncertain. Here we studied GLP-1R expression in the human heart using GLP-1R-directed antisera, quantitative PCR, reverse transcription PCR to detect full length mRNA transcripts, and in situ hybridization. GLP1R mRNA transcripts, encompassing the entire open reading frame, were detected in all four cardiac chambers from 15 hearts at levels approximating those detected in human pancreas...
February 12, 2018: Endocrinology
https://www.readbyqxmd.com/read/29438564/erratum-for-%C3%AE-7-nicotinic-acetylcholine-receptor-agonist-ameliorates-nicotine-plus-high-fat-diet-induced-hepatic-steatosis-in-male-mice-by-inhibiting-oxidative-stress-and-stimulating-ampk-signaling
#10
https://www.readbyqxmd.com/read/29438518/obesity-and-high-fat-diet-induce-distinct-changes-in-placental-gene-expression-and-pregnancy-outcome
#11
Erica B Mahany, Xingfa Han, Beatriz C Borges, Sanseray da Silveira Cruz-Machado, Susan J Allen, David Garcia-Galiano, Mark J Hoenerhoff, Nicole H Bellefontaine, Carol F Elias
Obese women are at high risk of pregnancy complications, including preeclampsia, miscarriage, preterm birth, stillbirth and neonatal death. In the present study, we aimed to determine the effects of obesity on pregnancy outcome and placental gene expression in preclinical mouse models of genetic and nutritional obesity. The leptin receptor null reactivatable (LepRloxTB), the LepR deficient (Leprdb/+) and high fat diet (HFD) fed mice were assessed for fertility, pregnancy outcome, placental morphology and placental transcriptome using standard qPCR and qPCR arrays...
February 9, 2018: Endocrinology
https://www.readbyqxmd.com/read/29438550/hypoxia-promotes-ectopic-adhesion-ability-of-endometrial-stromal-cells-via-tgf-%C3%AE-1-smad-signalling-in-endometriosis
#12
Xiang Lin, Yongdong Dai, Wenzhi Xu, Libing Shi, Xiaoying Jin, Chao Li, Feng Zhou, Yibin Pan, Yinli Zhang, Xiaona Lin, Songying Zhang
Hypoxia plays a vital role in the progression of endometriosis. And integrin-mediated aberrant adhesion is also essential for establishment of endometriotic lesions. Here, we aim to determine the function of hypoxia in integrin-mediated adhesion of endometrial stromal cells (ESCs) in endometriosis. The expressions of adhesion molecule integrins (integrin-α5, integrin-αV, integrin-β3, and integrin-β5) were determined in 15 normal endometrium and 15 paired eutopic and ectopic endometrium by immunohistochemistry...
February 8, 2018: Endocrinology
https://www.readbyqxmd.com/read/29438473/in-uncontrolled-diabetes-hyperglucagonemia-and-ketosis-result-from-deficient-leptin-action-in-the-parabrachial-nucleus
#13
Thomas H Meek, Miles E Matsen, Chelsea L Faber, Colby L Samstag, Vincent Damian, Hong T Nguyen, Jarrad M Scarlett, Jonathan N Flak, Martin G Myers, Gregory J Morton
Growing evidence implicates neurons that project from the lateral parabrachial nucleus (LPBN) to the hypothalamic ventromedial nucleus (VMN) in a neurocircuit that drives counterregulatory responses to hypoglycemia, including increased glucagon secretion. Among LPBN neurons in this circuit is a subset that expresses cholecystokinin (LPBNCCK neurons) and is tonically inhibited by leptin. Since uncontrolled diabetes is associated with both leptin deficiency and hyperglucagonemia, and since intracerebroventricular (icv) leptin administration reverses both hyperglycemia and hyperglucagonemia in this setting, we hypothesized that deficient leptin inhibition of LPBNCCK neurons drives activation of this LPBN→VMN circuit and thereby results in hyperglucagonemia...
February 8, 2018: Endocrinology
https://www.readbyqxmd.com/read/29425295/prenatal-exposure-to-unconventional-oil-and-gas-operation-chemical-mixtures-altered-mammary-gland-development-in-adult-female-mice
#14
Sarah A Sapouckey, Christopher D Kassotis, Susan C Nagel, Laura N Vandenberg
Unconventional oil and gas operations (UOG), which combine hydraulic fracturing (fracking) and directional drilling, involve the use of hundreds of chemicals including many with endocrine disrupting properties. Two previous studies examined mice exposed during early development to a 23-chemical mixture of UOG compounds (UOG-MIX) commonly used or produced in the process. Both male and female offspring exposed prenatally to one or more doses of UOG-MIX displayed alterations to endocrine organ function and serum hormone concentrations...
February 7, 2018: Endocrinology
https://www.readbyqxmd.com/read/29425287/perinatal-bisphenol-a-exposure-increases-atherosclerosis-in-adult-male-pxr-humanized-mice
#15
Yipeng Sui, Se-Hyung Park, Fang Wang, Changcheng Zhou
Bisphenol A (BPA) is a base chemical used extensively in numerous consumer products, and human exposure to BPA is ubiquitous. Higher BPA exposure has been associated with increased risk of atherosclerosis and cardiovascular disease (CVD) in multiple human population-based studies, but the underlying mechanisms responsible for the associations remain elusive. We previously reported that BPA activates the xenobiotic receptor pregnane X receptor (PXR) which has pro-atherogenic effects in animal models. Since BPA is a potent agonist for human PXR but does not affect rodent PXR activity, a suitable PXR-humanized Apolipoprotein E-deficient (huPXR•ApoE-/-) mouse model was developed to study BPA's atherogenic effects, and chronic BPA exposure indeed increased atherosclerosis in huPXR•ApoE-/- mice...
February 7, 2018: Endocrinology
https://www.readbyqxmd.com/read/29425286/central-neuropeptide-y-plays-an-important-role-in-mediating-the-adaptation-mechanism-against-chronic-stress-in-male-rats
#16
Yu Yang, Reji Babygirija, Jun Zheng, Bei Shi, Weinan Sun, Xiaojiao Zheng, Fan Zhang, Yu Cao
Exposure to continuous life stress often causes gastrointestinal (GI) symptoms. Studies have shown that neuropeptide Y (NPY) counteracts the biological actions of corticotrophin-releasing factor (CRF), and is involved in the termination of the stress response. However, in chronic repeated restraint stress (CRS) conditions, the actions of NPY on GI motility remain controversial. To evaluate the role of NPY in mediation of the adaptation mechanism and GI motility in CRS conditions, a CRS rat model was set up...
February 7, 2018: Endocrinology
https://www.readbyqxmd.com/read/29420715/modulation-of-nuclear-receptor-function-by-chromatin-modifying-factor-tip60
#17
Bharti Jaiswal, Ashish Gupta
Nuclear receptors are transcription factors that binds to specific DNA sequences known as hormone response elements located upstream of their target genes. Transcriptional activity of NRs can be modulated by binding of the compatible ligand and transient interaction with cellular coregulators functioning either as coactivators or as corepressors. Many coactivator proteins possess intrinsic histone acetyl transferase (HAT) activity that catalyzes the acetylation of specific lysine residues in histone tails and loosens the histone-DNA interaction thereby facilitating access of transcriptional factors to the regulatory sequences of the DNA...
February 6, 2018: Endocrinology
https://www.readbyqxmd.com/read/29420754/thyroid-specific-ppar%C3%AE-deletion-is-benign-in-the-mouse
#18
Jingcheng Yu, Ronald J Koenig
PPARγ is widely expressed at low levels and regulates many physiological processes. In mice and humans, there is evidence that PPARγ can function as a tumor suppressor. A PAX8-PPARγ fusion protein (PPFP) is oncogenic in a subset of thyroid cancers, suggesting that inhibition of endogenous PPARγ function by the fusion protein could contribute to thyroid oncogenesis. However, the function of PPARγ within thyrocytes has never been directly tested. Therefore, we have created a thyroid-specific genetic knockout of murine Pparg and have studied thyroid biology in these mice...
February 5, 2018: Endocrinology
https://www.readbyqxmd.com/read/29420708/sex-differences-in-maturation-of-human-embryonic-stem-cell-derived-beta-cells-in-mice
#19
Nelly Saber, Jennifer E Bruin, Shannon O'Dwyer, Hellen Schuster, Alireza Rezania, Timothy J Kieffer
Pancreatic progenitors derived from human embryonic stem cells (hESCs) are now in clinical trials for insulin replacement in patients with type 1 diabetes. Animal studies indicate the cells can mature into a mixed population of pancreatic endocrine cells including glucose-responsive beta cells several months after implant, but it remains unclear how conditions in the recipient may influence the maturation and ultimately the function of these cells. Here, we investigated the effects of the host sex and pregnancy on the maturation of human Stage 4 (S4) pancreatic progenitor cells and more mature Stage 7 (S7) pancreatic endocrine cells implanted under the kidney capsule of immunodeficient SCID-Beige mice...
February 5, 2018: Endocrinology
https://www.readbyqxmd.com/read/29420703/inhibition-of-srebp-with-fatostatin-does-not-attenuate-early-diabetic-nephropathy-in-male-mice
#20
Richard Van Krieken, Mandeep Marway, Pavithra Parthasarathy, Neel Mehta, Alistar J Ingram, Bo Gao, Joan C Krepinsky
Sterol regulatory element binding protein (SREBP) is an important potential mediator of kidney fibrosis, and is known to be upregulated in diabetic nephropathy. Here we evaluate the effectiveness of SREBP inhibition as treatment for diabetic nephropathy.Type 1 diabetes was induced in uninephrectomized male CD1 mice with streptozotocin. Mice were treated with the SREBP inhibitor fatostatin for 12 weeks. At endpoint, kidney function and pathology were assessed. Fatostatin inhibited the increase of both isoforms of SREBP (1 and 2) in diabetic kidneys...
February 5, 2018: Endocrinology
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