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https://www.readbyqxmd.com/read/29224108/negative-impact-of-testosterone-deficiency-and-5%C3%AE-reductase-inhibitors-therapy-on-metabolic-and-sexual-function-in-men
#1
Abdulmaged M Traish
Androgens are steroid hormones with pleotropic and diverse biochemical and physiological functions, and androgen deficiency exerts a negative impact on human health. Testosterone (T) either directly or via its transformation into the more potent metabolite 5α-dihydrotestosterone (5α-DHT) or via aromatization into estradiol (E2) modulates important biochemical signaling pathways of human physiology and plays a critical role in the growth and/or maintenance of functions in a host of tissues and organs. T and 5α-DHT play an important role in regulating physiology of the muscle, adipose tissue, liver, bone, and central nervous system, as well as reproductive and sexual functions...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224106/g-protein-coupled-estrogen-receptor-gper-and-sex-specific-metabolic-homeostasis
#2
Geetanjali Sharma, Eric R Prossnitz
Obesity and metabolic syndrome display disparate prevalence and regulation between males and females. Human, as well as rodent, females with regular menstrual/estrous cycles exhibit protection from weight gain and associated chronic diseases. These beneficial effects are predominantly attributed to the female hormone estrogen, specifically 17β-estradiol (E2). E2 exerts its actions via multiple receptors, nuclear and extranuclear estrogen receptor (ER) α and ERβ, and the G-protein-coupled estrogen receptor (GPER, previously termed GPR30)...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224105/nuclear-and-membrane-actions-of-estrogen-receptor-alpha-contribution-to-the-regulation-of-energy-and-glucose-homeostasis
#3
Maeva Guillaume, Alexandra Montagner, Coralie Fontaine, Françoise Lenfant, Jean-François Arnal, Pierre Gourdy
Estrogen receptor alpha (ERα) has been demonstrated to play a key role in reproduction but also to exert numerous functions in nonreproductive tissues. Accordingly, ERα is now recognized as a key regulator of energy homeostasis and glucose metabolism and mediates the protective effects of estrogens against obesity and type 2 diabetes. This chapter attempts to summarize our current understanding of the mechanisms of ERα activation and their involvement in the modulation of energy balance and glucose metabolism...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224103/sex-differences-and-role-of-estradiol-in-hypoglycemia-associated-counter-regulation
#4
Karen P Briski, Hussain N Alhamami, Ayed Alshamrani, Santosh K Mandal, Manita Shakya, Mostafa H H Ibrahim
Vital nerve cell functions, including maintenance of transmembrane voltage and information transfer, occur at high energy expense. Inadequate provision of the obligate metabolic fuel glucose exposes neurons to risk of dysfunction or injury. Clinical hypoglycemia rarely occurs in nondiabetic individuals but is an unfortunate regular occurrence in patients with type 1 or advanced insulin-treated type 2 diabetes mellitus. Requisite strict glycemic control, involving treatment with insulin, sulfonylureas, or glinides, can cause frequent episodes of iatrogenic hypoglycemia due to defective counter-regulation, including reduced glycemic thresholds and diminished magnitude of motor responses...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224090/men-are-from-mars-women-are-from-venus-sex-differences-in-insulin-action-and-secretion
#5
Ananda Basu, Simmi Dube, Rita Basu
Sex difference plays a substantial role in the regulation of glucose metabolism in healthy glucose-tolerant humans. The factors which may contribute to the sex-related differences in glucose metabolism include differences in lifestyle (diet and exercise), sex hormones, and body composition. Several epidemiological and observational studies have noted that impaired glucose tolerance is more common in women than men. Some of these studies have attributed this to differences in body composition, while others have attributed impaired insulin sensitivity as a cause of impaired glucose tolerance in women...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224087/epidemiology-of-gender-differences-in-diabetes-and-obesity
#6
Franck Mauvais-Jarvis
Some aspects of glucose homeostasis and energy balance are regulated differently in males and females. This review discusses the most fundamental gender differences in diabetes and obesity, including the prevalence of impaired fasting glucose and impaired glucose tolerance, the prevalence and incidence of type 2 and type 1 diabetes, as well as the prevalence of metabolic syndrome and obesity. These gender-specific differences in glucose homeostasis and energy balance represent a source of factors that should be studied to develop gender-based therapeutic avenues for diabetes...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29224025/alterations-in-adiposity-and-glucose-homeostasis-in-adult-gasp-1-overexpressing-mice
#7
Luce Périè, Alexis Parenté, Fabienne Baraige, Laetitia Magnol, Véronique Blanquet
BACKGROUND/AIMS: Myostatin is known as a powerful negative regulator of muscle growth playing a key role in skeletal muscle homeostasis. Recent studies revealed that myostatin-deficient mice lead to an increase of insulin sensitivity, a decrease of adiposity and a resistance to obesity, showing that myostatin can also impact on metabolism. Thus, myostatin appeared as a potential therapeutic target to treat insulin resistance. METHODS: We generated transgenic mice overexpressing Gasp-1, a myostatin inhibitor...
December 8, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29224011/glp-1-and-ghrelin-attenuate-high-glucose-high-lipid-induced-apoptosis-and-senescence-of-human-microvascular-endothelial-cells
#8
Pengzhi Liao, Dan Yang, Duan Liu, Yuehong Zheng
BACKGROUND/AIMS: GLP-1 and ghrelin are common appetite-regulating hormones. Both have multiple functions beyond metabolic regulation. However, the effects of GLP-1 and ghrelin on endothelial biology are not fully understood. Here, we investigate the roles of GLP-1 and ghrelin in microvascular endothelial apoptosis and senescence. METHODS: Human microvascular endothelial cells (HMECs) were exposed to high glucose/high lipid (HG/HL) conditions and treated with GLP-1 or ghrelin...
December 7, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29223854/baicalein-improves-liver-inflammation-in-diabetic-db-db-mice-by-regulating-hmgb1-tlr4-nf-%C3%AE%C2%BAb-signaling-pathway
#9
Huafeng Yin, Lihao Huang, Ting Ouyang, Lvyi Chen
The current study was designed to investigate the hepatoprotective effects and possible mechanisms of Baicalein (BA) on the diabetic liver injury in vivo and in vitro. The results exhibited that BA significantly restored the blood glucose in oral glucose tolerance test (OGTT) and inhibited the levels of insulin, alanine aminotransferase (ALT), aspartate aminotransaminase (AST), total cholesterol (TC) and triglyceride (TG) in C57BL/KsJ-db/db mice. Moreover, BA strikingly attenuated the extent of steatosis in the liver tissues of diabetic mice...
December 7, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/29223774/physiological-and-proteomic-responses-to-corticosteroid-treatments-in-eurasian-perch-perca-fluviatilis-investigation-of-immune-related-parameters
#10
Sylvain Milla, Sophie Massart, Cédric Mathieu, Neil Wang, Caroline Douny, Jessica Douxfils, Marie-Louise Scippo, Edwin De Pauw, Marc Dieu, Frédéric Silvestre, Patrick Kestemont
The comparative effects of cortisol and 11-deoxycorticosterone (DOC), two major corticosteroids in fish, have yet received little attention in teleosts. We evaluated the proteomic and immune responses of Eurasian perch to chronic corticosteroid treatments. We implanted immature perch with cortisol (80mg/kg) or DOC (4mg/kg) and measured the proportions of blood leucocytes, immune indices in the plasma, spleen and liver (complement and lysozyme activity, total immunoglobulin and immune gene expression in the tissues) and differential proteome expression (corticosteroid versus control) in the liver and the spleen on days 2, 4 and 14 post-treatment...
December 1, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/29223569/isolated-mangiferin-and-naringenin-exert-antidiabetic-effect-via-ppar%C3%AE-glut4-dual-agonistic-action-with-strong-metabolic-regulation
#11
Ashok K Singh, Vinit Raj, Amit K Keshari, Amit Rai, Pranesh Kumar, Atul Rawat, Biswanath Maity, Dinesh Kumar, Anand Prakash, Arnab De, Amalesh Samanta, Bolay Bhattacharya, Sudipta Saha
In this study, we isolated two compounds from the leaves of Salacia oblonga (SA1, mangiferin and SA2, naringenin), and their structures were confirmed by infrared spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry. SA1 and SA2 were orally administered to streptozotocin-induced diabetic rats at 50 and 100 mg/kg daily for 15 days. Blood glucose level, serum lipid profile, oxidative stress parameters, histopathology, docking, molecular parameters, and NMR-based metabolic perturbation studies were performed to investigate the pharmacological activities of SA1 and SA2...
December 6, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29223394/islet-%C3%AE-cell-an-endocrine-cell-secreting-mirnas
#12
Aisen Zhang, Dameng Li, Yucheng Liu, Jing Li, Yujing Zhang, Chen-Yu Zhang
The pancreas is an important endocrine organ. Pancreatic beta (β) cells secrete insulin to regulate the metabolism of glucose and maintain the stability of blood glucose. MicroRNAs (miRNAs), small (20-25 nt) non-coding RNA molecules, function in target gene silencing through post-transcriptional patterns, and multiple miRNAs regulate insulin secretion, insulin signaling pathways in pancreatic β cells and islet activity. In recent years, it has been found that many types of cells can secrete regulatory miRNA, but whether islet cells can secrete miRNA has not been clarified yet...
December 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29223351/ck2%C3%AE-promotes-advanced-glycation-end-products-induced-expressions-of-fibronectin-and-intercellular-adhesion-molecule-1-via-activating-mrtf-a-in-glomerular-mesangial-cells
#13
Zhiquan Chen, Qiuhong Chen, Junying Huang, Wenyan Gong, Yezi Zou, Lei Zhang, Peiqing Liu, Heqing Huang
Advanced glycation end products (AGEs) modification of extracellular matrix proteins induces crosslinking, which results in thickening of the basement membrane and activating several intracellular signaling cascades, eventually promoting the pathological progression of diabetic nephropathy (DN). We have previously confirmed that casein kinase 2α (CK2α) activates the nuclear factor of kappaB (NF-κB) signaling pathway to enhance high glucose-induced expressions of fibronectin (FN) and intercellular adhesion molecule-1 (ICAM-1) in glomerular mesangial cells (GMCs)...
December 6, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29223335/genome-wide-identification-of-glycosyltransferases-converting-phloretin-to-phloridzin-in-malus-species
#14
Kun Zhou, Lingyu Hu, Pengmin Li, Xiaoqing Gong, Fengwang Ma
Phloridzin (phloretin 2'-O-glucoside) is the most abundant phenolic compound in Malus species, accounting for up to 18% of the dry weight in leaves. Glycosylation of phloretin at the 2' position is the last and key step in phloridzin biosynthesis. It is catalyzed by a uridine diphosphate (UDP)-glucose:phloretin 2'-O-glucosyltransferase (P2'GT), which directly determines the concentration of phloridzin. However, this process is poorly understood. We conducted a large-scale investigation of phloridzin accumulations in leaves from 64 Malus species and cultivars...
December 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/29223280/circadian-and-ultradian-patterns-of-hpa-axis-activity-in-rodents-significance-for-brain-functionality
#15
REVIEW
Femke S den Boon, R Angela Sarabdjitsingh
The hypothalamo-pituitary-adrenal (HPA) axis comprises interactions between the hypothalamus, the pituitary and the adrenal glands and its activation results in the release of corticosteroid hormones. Corticosteroids are secreted from the adrenal gland in a distinct 24-h circadian rhythm overarching an ultradian rhythm, which consists of hourly corticosteroid pulses exposing target tissues to rapidly changing steroid levels. On top of these rhythms surges can take place after stress. HPA-axis rhythms promote adaptation to predictable (i...
October 2017: Best Practice & Research. Clinical Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29222957/association-between-%C3%AE-cell-function-estimated-by-homa-%C3%AE-and-prognosis-of-nondiabetic-patients-with-ischaemic-stroke
#16
Mengyuan Zhou, Yuesong Pan, Jing Jing, Yongjun Wang, Xingquan Zhao, Liping Liu, Hao Li, Yilong Wang
BACKGROUND AND PURPOSE: Studies showed β-cell dysfunction was associated with increased risk of cardiovascular disease and subclinical carotid atherosclerosis. This study aimed to investigate the association between β-cell function and prognosis of nondiabetic patients with ischaemic stroke. METHODS: Ischaemic stroke patients without diabetes in the Abnormal Glucose Regulation in Patients with Acute Stroke across China registry were included in this analysis. Homeostasis assessment of β-cell function (HOMA-β), was performed and classified it into four groups according to quartiles...
December 9, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29222456/bmps-as-new-insulin-sensitizers-enhanced-glucose-uptake-in-mature-3t3-l1-adipocytes-via-ppar%C3%AE-and-glut4-upregulation
#17
Isabelle Schreiber, Gina Dörpholz, Claus-Eric Ott, Bjørt Kragesteen, Nancy Schanze, Cory Thomas Lee, Josef Köhrle, Stefan Mundlos, Karen Ruschke, Petra Knaus
Insulin-resistance is the main cause of type 2 diabetes. Here we describe the identification and characterization of BMP2 and BMP6 as new insulin-sensitizing growth factors in mature adipocytes. We show that BMP2 and BMP6 lead to enhanced insulin-mediated glucose uptake in both insulin-sensitive and -insensitive adipocytes. We exclude a direct effect of BMP2 or BMP6 on translocation of GLUT4 to the plasma membrane and demonstrate that these BMPs increase GLUT4 protein levels equipotent to Rosiglitazone. BMPs induce expression of PPARγ as the crucial mediator for the insulin-sensitizing effect...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29222417/insulin-in-motion-the-a6-a11-disulfide-bond-allosterically-modulates-structural-transitions-required-for-insulin-activity
#18
Bianca van Lierop, Shee Chee Ong, Alessia Belgi, Carlie Delaine, Sofianos Andrikopoulos, Naomi L Haworth, John G Menting, Michael C Lawrence, Andrea J Robinson, Briony E Forbes
The structural transitions required for insulin to activate its receptor and initiate regulation of glucose homeostasis are only partly understood. Here, using ring-closing metathesis, we substitute the A6-A11 disulfide bond of insulin with a rigid, non-reducible dicarba linkage, yielding two distinct stereo-isomers (cis and trans). Remarkably, only the cis isomer displays full insulin potency, rapidly lowering blood glucose in mice (even under insulin-resistant conditions). It also posseses reduced mitogenic activity in vitro...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29222328/fructose-and-glucose-regulate-mammalian-target-of-rapamycin-complex-1-and-can-activate-lipogenic-gene-expression-via-distinct-pathways
#19
Yue Hu, Ivana Semova, Xiaowei Sun, Hong Kang, Satyapal Chahar, Anthony N Hollenberg, David Masson, Matthew D Hirschey, Ji Miao, Sudha B Biddinger
Though calorically equivalent to glucose, fructose appears to be more lipogenic, leading to dyslipidemia, fatty liver disease, cardiovascular disease, and diabetes. To better understand how fructose induces lipogenesis, we compared the effects of fructose and glucose on the mTORC1 signaling node, a central regulator of lipogenesis. We found that fructose acutely and transiently suppressed mTORC1 signaling in vitro and in vivo. The constitutive activation of mTORC1 reduced hepatic lipogenic gene expression and produced hypotriglyceridemia after one week of fructose feeding...
December 8, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29221953/antitumor-action-of-3-bromopyruvate-implicates-reorganized-tumor-growth-regulatory-components-of-tumor-milieu-cell-cycle-arrest-and-induction-of-mitochondria-dependent-tumor-cell-death
#20
Saveg Yadav, Praveen Kumar Kujur, Shrish Kumar Pandey, Yugal Goel, Babu Nandan Maurya, Ashish Verma, Ajay Kumar, Rana Pratap Singh, Sukh Mahendra Singh
Evidences demonstrate that metabolic inhibitor 3-bromopyruvate (3-BP) exerts a potent antitumor action against a wide range of malignancies. However, the effect of 3-BP on progression of the tumors of thymic origin remains unexplored. Although, constituents of tumor microenvironment (TME) plays a pivotal role in regulation of tumor progression, it remains unclear if 3-BP can alter the composition of the crucial tumor growth regulatory components of the external surrounding of tumor cells. Thus, the present investigation attempts to understand the effect of 3-BP administration to a host bearing a progressively growing tumor of thymic origin on tumor growth regulatory soluble, cellular and biophysical components of tumor milieu vis-à-vis understanding its association with tumor progression, accompanying cell cycle events and mode of cell death...
December 5, 2017: Toxicology and Applied Pharmacology
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