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adipokine and estrogen

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https://www.readbyqxmd.com/read/28676553/voluntary-physical-activity-counteracts-the-proliferative-tumor-growth-microenvironment-created-by-adipose-tissue-via-high-fat-diet-feeding-in-female-rats
#1
Christopher F Theriau, Michael K Connor
The adipokine secretion profile created from adipose tissue may represent the molecular mechanism behind the obesity-breast cancer association. Two adipokines, adiponectin (ADIPO), and leptin (LEP), are altered with obesity and exert antagonistic effects on breast cancer proliferation. We set out to determine whether the adipose-dependent tumor promoting growth environment created by a high-fat diet (HFD) in female Sprague-Dawley rats is altered compared to established responses in male rats and whether voluntary physical activity (PA) ameliorates any HFD-dependent effects...
July 2017: Physiological Reports
https://www.readbyqxmd.com/read/28585217/obesity-associated-breast-cancer-analysis-of-risk-factors
#2
Atilla Engin
Several studies show that a significantly stronger association is obvious between increased body mass index (BMI) and higher breast cancer incidence. Furthermore, obese women are at higher risk of all-cause and breast cancer specific mortality when compared to non-obese women with breast cancer. In this context, increased levels of estrogens due to excessive aromatization activity of the adipose tissue, overexpression of pro-inflammatory cytokines, insulin resistance, hyperactivation of insulin-like growth factors (IGFs) pathways, adipocyte-derived adipokines, hypercholesterolemia and excessive oxidative stress contribute to the development of breast cancer in obese women...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28542577/leptin-signals-via-tgfb1-to-promote-metastatic-potential-and-stemness-in-breast-cancer
#3
Ameet K Mishra, Christopher R Parish, Ma-Li Wong, Julio Licinio, Anneke C Blackburn
Epidemiological studies have shown obesity to be linked with poorer outcomes in breast cancer patients. The molecular mechanisms responsible for the increased risk of invasive/metastatic disease with obesity are complex, but may include elevated levels of adipokines such as leptin. Using physiological levels of leptin found in obesity in a novel chronic in vitro treatment model (≤200 ng/ml for 14 days), we confirmed the occurrence of leptin-mediated changes in growth, apoptosis and metastatic behavior, and gene expression changes representing epithelial-to-mesenchymal transition (EMT) and a cancer stem cell (CSC) like phenotype in breast epithelial and cancer cell lines (MCF10A, MCF10AT1, MCF7 and MDA-MB-231)...
2017: PloS One
https://www.readbyqxmd.com/read/28505082/supervised-clustering-of-adipokines-and-hormonal-receptors-predict-prognosis-in-a-population-of-obese-women-with-type-1-endometrial-cancer
#4
Jennifer Uzan, Enora Laas, Issam Abd Alsamad, Dounia Skalli, Dhouha Mansouri, Bassam Haddad, Cyril Touboul
Obesity is a major risk factor for endometrial cancer (EC). Yet, its impact on prognosis is controversial. Obesity is associated with metabolic and hormonal dysregulation as well as adipokines increase. The aim of this study was to characterize the expression of biological factors related to obesity within the tumor and evaluate their impact on prognosis. One hundred and thirty-six patients, including 55 obese patients, with endometrioid type I EC operated by total hysterectomy were included in this retrospective study conducted in a Tertiary teaching hospital between 2000 and 2013...
May 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28436761/androgen-and-estrogen-shifts-in-men-before-and-after-bariatric-surgery-and-links-to-vitamins-and-trace-elements
#5
Alberto Rosenblatt, Joel Faintuch, Ivan Cecconello
Androgens and estrogens play a key role regarding sexual life and reproduction. Along with hypotestosteronemia, obese men exhibit a 2-fold increase in estradiol concentration, adversely infl uencing these parameters. Estrogens and adipokines also infl uence bone metabolism, exerting a direct effect on vitamin D, calcium homeostasis and bone health. Bariatric procedures normalize some sex hormones, and may reverse several obesity-related conditions. Estrogens levels may remain elevated postoperatively, and despite its protective effect on the skeleton, bariatric patients are more prone to fractures when compared to the general population...
April 24, 2017: International Journal for Vitamin and Nutrition Research. Journal International de Vitaminologie et de Nutrition
https://www.readbyqxmd.com/read/28337254/amp-activated-protein-kinase-and-energy-balance-in-breast-cancer
#6
REVIEW
Hong Zhao, Yelda C Orhan, Xiaoming Zha, Ecem Esencan, Robert T Chatterton, Serdar E Bulun
Cancer growth and metastasis depends on the availability of energy. Energy-sensing systems are critical in maintaining a balance between the energy supply and utilization of energy for tumor growth. A central regulator in this process is AMP-activated protein kinase (AMPK). In times of energy deficit, AMPK is allosterically modified by the binding of increased levels of AMP and ADP, making it a target of specific AMPK kinases (AMPKKs). AMPK signaling prompts cells to produce energy at the expense of growth and motility, opposing the actions of insulin and growth factors...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28116469/adipokines-may-mediate-the-relationship-between-resting-metabolic-rates-and-bone-mineral-densities-in-obese-women
#7
S Moradi, K Mirzaei, A A Abdurahman, S A Keshavarz
The researchers sought to test the possible link between resting metabolic rate and bone mineral density through four adipokines. Participants with lower resting metabolic rate (RMR) per kilogram demonstrated higher total bone mineral density (BMD), total T-score, and total Z-score. Omentin-1 had a mediatory effect on the relationship between RMR/kg of body weight and bone parameters. INTRODUCTION: The previous results of studies regarding the links between obesity and bone health are controversial...
January 23, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28115579/the-role-of-sex-steroids-in-white-adipose-tissue-adipocyte-function
#8
REVIEW
A E Newell-Fugate
With the increasing knowledge that gender influences normal physiology, much biomedical research has begun to focus on the differential effects of sex on tissue function. Sexual dimorphism in mammals is due to the combined effects of both genetic and hormonal factors. Hormonal factors are mutable particularly in females in whom the estrous cycle dominates the hormonal milieu. Given the severity of the obesity epidemic and the fact that there are differences in the obesity rates in men and women, the role of sex in white adipose tissue function is being recognized as increasingly important...
April 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27914795/insulin-use-adipokine-profiles-and-breast-cancer-prognosis
#9
Zachary A P Wintrob, Jeffrey P Hammel, Thaer Khoury, George K Nimako, Hsin-Wei Fu, Zahra S Fayazi, Dan P Gaile, Alan Forrest, Alice C Ceacareanu
BACKGROUND: Type-2 diabetes mellitus (T2DM) and breast cancer (BC) share common cytokine signaling changes resultant from adipose tissue dysfunction. This modified adipokine signaling was shown to be directly associated with changes in the body mass index (BMI) and diet and it is expected to also be influenced by T2DM pharmacotherapy. We evaluated the relationship between pre-existing diabetes treatment, circulating adipokine levels at cancer diagnosis, and long-term outcomes. METHODS: All incident BC cases were reviewed (01/01/2003-12/31/2009, N=2194)...
January 2017: Cytokine
https://www.readbyqxmd.com/read/27909909/obesity-biomarkers-metabolism-and-risk-of-cancer-an-epidemiological-perspective
#10
REVIEW
Katharina Nimptsch, Tobias Pischon
Obesity is associated with metabolic alterations that may pose a biological link between body fatness and risk of cancer. Elucidating the role of obesity-related biomarkers in cancer development is essential for developing targeted strategies aiming at obesity-associated cancer prevention. Molecular epidemiological studies of the past decades have provided evidence that major hormonal pathways linking obesity and cancer risk include the insulin and insulin-like growth factor-1 (IGF-1) axis, sex-steroid hormones, adipokines and chronic low-grade inflammation...
2016: Recent Results in Cancer Research
https://www.readbyqxmd.com/read/27859423/from-obesity-to-cancer-a-review-on-proposed-mechanisms
#11
REVIEW
Zoya Tahergorabi, Majid Khazaei, Mitra Moodi, Elham Chamani
Nowadays, obesity is considered as a serious and growing global health problem. It is documented that the overweight and obesity are major risk factors for a series of noncommunicable diseases, and in recent years, the obesity-cancer link has received much attention. Numerous epidemiological studies have shown that obesity is associated with increased risk of several cancer types, including colon, breast, endometrium, liver, kidney, esophagus, gastric, pancreatic, gallbladder, and leukemia, and can also lead to poorer treatment...
December 2016: Cell Biochemistry and Function
https://www.readbyqxmd.com/read/27831918/17%C3%AE-estradiol-suppresses-visceral-adipogenesis-and-activates-brown-adipose-tissue-specific-gene-expression
#12
Saad Misfer Al-Qahtani, Galyna Bryzgalova, Ismael Valladolid-Acebes, Marion Korach-André, Karin Dahlman-Wright, Suad Efendić, Per-Olof Berggren, Neil Portwood
Both functional ovaries and estrogen replacement therapy (ERT) reduce the risk of type 2 diabetes (T2D). Understanding the mechanisms underlying the antidiabetic effects of 17β-estradiol (E2) may permit the development of a molecular targeting strategy for the treatment of metabolic disease. This study examines how the promotion of insulin sensitivity and weight loss by E2 treatment in high-fat-diet (HFD)-fed mice involve several anti-adipogenic processes in the visceral adipose tissue. Magnetic resonance imaging (MRI) revealed specific reductions in visceral adipose tissue volume in HFD+E2 mice, compared with HFD mice...
January 1, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/27389130/gender-dimorphism-in-adipose-tissue-response-to-stress-conditions-a-plausible-mechanism-to-explain-the-conflicting-data-regarding-trauma-and-obesity
#13
Mark E Diebel, Lawrence N Diebel, David M Liberati
INTRODUCTION: Obesity is a chronic low-grade inflammatory condition associated with the elaboration of proinflammatory cytokines and adipokines from adipose tissue. Gender dimorphism (in part due to sex hormones) has been identified after injury and hemorrhagic shock. We hypothesized that the sex hormones estrogen (E2) and testosterone (DHT) have disparate effects on inflammatory mediator production from adipose tissue under stress conditions. This was studied in an in vitro model. METHODS: Mature adipocytes differentiated from adipose-derived stem cells were cocultured (2:1) with macrophages (RAW 264...
December 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/27059487/adipokines-and-vascular-endothelial-growth-factor-in-normal-human-breast-tissue-in-vivo-correlations-and-attenuation-by-dietary-flaxseed
#14
Vivian Morad, Annelie Abrahamsson, Preben Kjölhede, Charlotta Dabrosin
Exposure to sex steroids increases the risk of breast cancer but the exact mechanisms are yet to be elucidated. Events in the microenvironment are important for carcinogenesis. Diet containing phytoestrogens can affect the breast microenvironment and alter the risk of breast cancer. It has previously been shown that estrogen regulates extracellular levels of leptin, adiponectin, and VEGF in normal breast tissue in vivo. Whether these proteins correlate in breast tissue in vivo or if diet addition of flaxseed, a major source of phytoestrogens in Western diets, alters adipokine levels in breast tissue are unknown...
June 2016: Journal of Mammary Gland Biology and Neoplasia
https://www.readbyqxmd.com/read/26865587/obesity-and-breast-cancer-molecular-interconnections-and-potential-clinical-applications
#15
Valeria Simone, Morena D'Avenia, Antonella Argentiero, Claudia Felici, Francesca Maria Rizzo, Giovanni De Pergola, Franco Silvestris
UNLABELLED: Obesity is an important risk factor for breast cancer (BC) in postmenopausal women; interlinked molecular mechanisms might be involved in the pathogenesis. Increased levels of estrogens due to aromatization of the adipose tissue, inflammatory cytokines such as tumor necrosis factor-α, interleukin-6, and prostaglandin E2, insulin resistance and hyperactivation of insulin-like growth factors pathways, adipokines, and oxidative stress are all abnormally regulated in obese women and contribute to cancerogenesis...
April 2016: Oncologist
https://www.readbyqxmd.com/read/26863308/anorexia-nervosa-and-its-associated-endocrinopathy-in-young-people
#16
REVIEW
Madhusmita Misra, Anne Klibanski
Anorexia nervosa (AN) is a condition of severe undernutrition associated with adaptive changes in many endocrine axes. These changes include hypogonadotropic hypogonadism, acquired growth hormone resistance with low insulin-like growth factor 1 (IGF-1) levels, hypercortisolemia, altered secretion of adipokines and appetite-regulating hormones, and low bone mineral density (BMD). Bone health is impaired subsequent to a low body mass index, decreased lean mass, and the endocrine changes described above. In addition to low areal BMD, AN is characterized by a decrease in volumetric BMD, changes in bone geometry, and reductions in strength estimates, leading to an increased risk for fracture...
2016: Hormone Research in Pædiatrics
https://www.readbyqxmd.com/read/26862086/mammary-adipose-tissue-derived-lysophospholipids-promote-estrogen-receptor-negative-mammary-epithelial-cell-proliferation
#17
Paul A Volden, Maxwell N Skor, Marianna B Johnson, Puneet Singh, Feenalie N Patel, Martha K McClintock, Matthew J Brady, Suzanne D Conzen
Lysophosphatidic acid (LPA), acting in an autocrine or paracrine fashion through G protein-coupled receptors, has been implicated in many physiologic and pathologic processes, including cancer. LPA is converted from lysophosphatidylcholine (LPC) by the secreted phospholipase autotaxin (ATX). Although various cell types can produce ATX, adipocyte-derived ATX is believed to be the major source of circulating ATX and also to be the major regulator of plasma LPA levels. In addition to ATX, adipocytes secrete numerous other factors (adipokines); although several adipokines have been implicated in breast cancer biology, the contribution of mammary adipose tissue-derived LPC/ATX/LPA (LPA axis) signaling to breast cancer is poorly understood...
May 2016: Cancer Prevention Research
https://www.readbyqxmd.com/read/26680475/levels-of-adipokines-and-some-steroids-during-the-menstrual-cycle
#18
M Šrámková, M Dušková, J Vítků, J Včelák, P Matucha, O Bradnová, J de Cordeiro, L Stárka
The cyclical effects of hormones during the menstrual cycle (MC) are not just responsible for driving ovulation, but also have significant influence on dietary intake and appetite, as well as psychological and behavioral changes. The aim of our study was to describe changes and relationships between the MC and selected steroids, adipokines and food intake-related hormones. Twenty-seven women with regular menstrual cycles were included in the study, and their hormonal spectrum was measured in regular intervals starting from the first day of their cycle...
2015: Physiological Research
https://www.readbyqxmd.com/read/26623005/the-obesity-of-bone
#19
REVIEW
Emanuela A Greco, Andrea Lenzi, Silvia Migliaccio
During the last decades, obesity and osteoporosis have become important global health problems, and the belief that obesity is protective against osteoporosis has recently come into question. In fact, some recent epidemiologic and clinical studies have shown that a high level of fat mass might be a risk factor for osteoporosis and fragility fractures. Several potential mechanisms have been proposed to explain the complex relationship between adipose tissue and bone. Indeed, adipose tissue secretes various molecules, named adipokines, which are thought to have effects on metabolic, skeletal and cardiovascular systems...
December 2015: Therapeutic Advances in Endocrinology and Metabolism
https://www.readbyqxmd.com/read/26317527/effects-of-estrogens-on-adipokines-and-glucose-homeostasis-in-female-aromatase-knockout-mice
#20
Michelle L Van Sinderen, Gregory R Steinberg, Sebastian B Jørgensen, Jane Honeyman, Jenny D Chow, Kerrie A Herridge, Amy L Winship, Evdokia Dimitriadis, Margaret E E Jones, Evan R Simpson, Wah Chin Boon
The maintenance of glucose homeostasis within the body is crucial for constant and precise performance of energy balance and is sustained by a number of peripheral organs. Estrogens are known to play a role in the maintenance of glucose homeostasis. Aromatase knockout (ArKO) mice are estrogen-deficient and display symptoms of dysregulated glucose metabolism. We aim to investigate the effects of estrogen ablation and exogenous estrogen administration on glucose homeostasis regulation. Six month-old female wildtype, ArKO, and 17β-estradiol (E2) treated ArKO mice were subjected to whole body tolerance tests, serum examination of estrogen, glucose and insulin, ex-vivo muscle glucose uptake, and insulin signaling pathway analyses...
2015: PloS One
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