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Thyroid AND reproduction

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https://www.readbyqxmd.com/read/28926868/polycystic-ovary-syndrome-pcos-in-juvenile-and-adult-type-1-diabetes-in-a-german-austrian-cohort
#1
Christina Reinauer, Esther Bollow, Elke Fröhlich-Reiterer, Katharina Laubner, Dominik Bergis, Christof Schöfl, Hans-Peter Kempe, Michael Hummel, Pia Hennes, Katja Gollisch, Holger Haberland, Nicolin Datz, Thomas Meissner, Reinhard W Holl
Context While an association between PCOS and type 2 diabetes is well established, to date there have been few data on clinical care of type 1 diabetes (T1D) patients with PCOS. Objective The aim of our study was to characterize T1D patients with the comorbidity of PCOS within the DPV cohort with regard to diabetes phenotype, therapy and metabolic control. Design and Setting Clinical data from the prospective German/Austrian DPV cohort on patients with T1D and documented PCOS (n=76) were compared to female T1D controls (n=32,566) in reproductive age...
September 19, 2017: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/28895797/neuroendocrine-disruption-of-organizational-and-activational-hormone-programming-in-poikilothermic-vertebrates
#2
Cheryl S Rosenfeld, Nancy D Denslow, Edward F Orlando, Juan Manuel Gutierrez-Villagomez, Vance L Trudeau
In vertebrates, sexual differentiation of the reproductive system and brain is tightly orchestrated by organizational and activational effects of endogenous hormones. In mammals and birds, the organizational period is typified by a surge of sex hormones during differentiation of specific neural circuits; whereas activational effects are dependent upon later increases in these same hormones at sexual maturation. Depending on the reproductive organ or brain region, initial programming events may be modulated by androgens or require conversion of androgens to estrogens...
2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/28892180/long-term-exposure-to-bisphenol-s-damages-the-visual-system-and-reduces-the-tracking-capability-of-male-zebrafish-danio-rerio
#3
Wenmin Liu, Xiaona Zhang, Penghao Wei, Hua Tian, Wei Wang, Shaoguo Ru
Bisphenol S (BPS) is widely detected in aquatic environments and in human bodies. BPS has reproductive and thyroid disrupting effects, but its effect on the visual system remains unknown. In the present study, zebrafish embryos were exposed to BPS at concentrations of 1, 10, 100 and 1000 μg l(-1) until 120 days post-fertilization in a semistatic system, and the effect of BPS on the visual behavior was examined using the optokinetic response and the optomotor response tests in male zebrafish. The retinal histology, mRNA expression of photoreceptor opsin genes (zfrho, zfblue, zfgr1, zfred and zfuv) and apoptosis-related genes (bax and bcl-2) were also assessed...
September 11, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28879804/evaluation-of-the-endocrine-disrupting-effects-of-homosalate-hms-and-2-ethylhexyl-4-dimethylaminobenzoate-od-paba-in-rat-pups-during-the-prenatal-lactation-and-early-postnatal-periods
#4
Meltem Erol, Ismet Çok, Özlem Bostan Gayret, Pembegül Günes, Özgül Yigit, Elif Sayman, Aysegül Günes, Duygu Sultan Çelik, Sahin Hamilçikan, Serdar Altinay, Oya Ercan
Homosalate (HMS) and 2-ethylhexyl 4-dimethylaminobenzoate (OD-PABA) are ultraviolet filters. We aimed to investigate the effects of dermal exposure to HMS and OD-PABA during the prenatal, lactation, and early infancy periods on pubertal development and thyroid function in male and female rats. The thyroid glands, uteri, testes, prostate glands, and seminal vesicles were excised and weighed, the reproductive organs were analyzed histologically, and the serum hormone levels were measured. In the prenatal period, the thyroxine (T4) levels increased in the female rats in the exposed groups ( p < 0...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28874095/seasonal-rhythms-the-role-of-thyrotropin-and-thyroid-hormones
#5
Tomoya Nakayama, Takashi Yoshimura
Seasonal changes in various physiological events have been reported in humans including metabolism, immune function, and mood. However, the molecular and endocrine basis of the seasonal changes remain unclear. Animals that breed seasonally such as, the Japanese quail and Siberian hamster have sophisticated seasonal mechanisms and provide excellent opportunities to understand the underlying processes. Functional genomic analysis of the quail uncovered the photoperiodic signal transduction pathway, which regulates avian seasonal reproduction: Long day stimulus induces secretion of the thyroid-stimulating hormone (TSH) from the pars tuberalis (PT) of the anterior pituitary gland...
September 6, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/28857258/summary-of-the-development-the-us-environmental-protection-agency-s-medaka-extended-one-generation-reproduction-test-meogrt-using-data-from-9-multigenerational-medaka-tests
#6
Kevin Flynn, Doug Lothenbach, Frank Whiteman, Dean Hammermeister, Leslie W Touart, Joe Swintek, Norihisa Tatarazako, Yuta Onishi, Taisen Iguchi, Rodney Johnson
In response to various legislative mandates, the US Environmental Protection Agency (USEPA) formed its Endocrine Disruptor Screening Program (EDSP), which in turn, formed the basis of a tiered testing strategy to determine the potential of pesticides, commercial chemicals, and environmental contaminants to disrupt the endocrine system. The first tier of tests is intended to detect the potential for endocrine disruption mediated through estrogen, androgen, or thyroid pathways, whereas the second tier is intended to further characterize the effects on these pathways and to establish a dose-response relationship for adverse effects...
August 30, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28774778/frontiers-in-endocrine-disruption-impacts-of-organotin-on-the-hypothalamus-pituitary-thyroid-axis
#7
REVIEW
Ana Paula Santos-Silva, Marcelle Novaes Andrade, Paula Pereira-Rodrigues, Francisca Diana Paiva-Melo, Paula Soares, Jones Bernardes Graceli, Glaecir Roseni Mundstock Dias, Andrea Claudia Freitas Ferreira, Denise Pires de Carvalho, Leandro Miranda-Alves
Endocrine disruptors (EDs), chemical substances widely used in industry and ubiquitously distributed in the environment, are able to interfere with the synthesis, release, transport, metabolism, receptor binding, action, or elimination of endogenous hormones. EDs affect homeostasis mainly by acting on nuclear and nonnuclear steroid receptors but also on serotonin, dopamine, norepinephrine and orphan receptors in addition to thyroid hormone receptors. Tributyltin (TBT), an ED widely used as a pesticide and biocide in antifouling paints, has well-documented actions that include inhibiting aromatase and affecting the nuclear receptors PPARγ and RXR...
July 31, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28758357/thyroid-medication-use-and-birth-defects-in-the-national-birth-defects-prevention-study
#8
Meredith M Howley, Sarah C Fisher, Alissa R Van Zutphen, Dorothy K Waller, Suzan L Carmichael, Marilyn L Browne
BACKGROUND: Thyroid disorders are common among reproductive-aged women, with hypothyroidism affecting 2 to 3% of pregnancies, and hyperthyroidism affecting an additional 0.1 to 1%. We examined associations between thyroid medications and individual birth defects using data from the National Birth Defects Prevention Study (NBDPS). METHODS: The NBDPS is a multisite, population-based, case-control study that included pregnancies with estimated delivery dates from 1997 to 2011...
July 31, 2017: Birth defects research
https://www.readbyqxmd.com/read/28723963/impact-of-thyroid-function-abnormalities-on-reproductive-hormones-during-menstrual-cycle-in-premenopausal-hiv-infected-females-at-nauth-nnewi-nigeria
#9
Nkiruka Rose Ukibe, Solomon Nwabueze Ukibe, Obiageli Fidelia Emelumadu, Chinedum Charles Onyenekwe, Joseph Eberendu Ahaneku, Anthony Osita Igwegbe, Ifeoma Nwamaka Monago, Amobi Linus Ilika
BACKGROUND: This was a prospective study designed to evaluate the impact of thyroid function abnormalities on reproductive hormones during menstrual cycle in HIV infected females at Nnamdi Azikiwe University Teaching Hospital Nnewi, South-East Nigeria. METHODS: The study randomly recruited 35 Symptomatic HIV infected females and 35 Symptomatic HIV infected females on antiretroviral therapy (HAART) for not less than six weeks from an HIV clinic and 40 apparently heathy control females among the hospital staff of NAUTH Nnewi...
2017: PloS One
https://www.readbyqxmd.com/read/28716942/maternal-photoperiod-programs-hypothalamic-thyroid-status-via-the-fetal-pituitary-gland
#10
Cristina Sáenz de Miera, Béatrice Bothorel, Catherine Jaeger, Valérie Simonneaux, David Hazlerigg
In wild mammals, offspring development must anticipate forthcoming metabolic demands and opportunities. Within species, different developmental strategies may be used, dependent on when in the year conception takes place. This phenotypic flexibility is initiated before birth and is linked to the pattern of day length (photoperiod) exposure experienced by the mother during pregnancy. This programming depends on transplacental communication via the pineal hormone melatonin. Here, we show that, in the Siberian hamster (Phodopus sungorus), the programming effect of melatonin is mediated by the pars tuberalis (PT) of the fetal pituitary gland, before the fetal circadian system and autonomous melatonin production is established...
August 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28715746/pfoa-induced-metabolism-disturbance-and-multi-generational-reproductive-toxicity-in-oryzias-latipes
#11
Jin Wuk Lee, Jae-Woo Lee, Kyungtae Kim, Yu-Jin Shin, Jieun Kim, Suhkmann Kim, Heejung Kim, Pilje Kim, Kyunghwa Park
The aims of this study were to examine multi-generational reproductive toxicity and metabolism disturbances in Oryzias latipes exposed to 0.3, 3, and 30mg/L PFOA for 259-day. The highest concentration of PFOA suppressed fecundity over three generations from F0 to F2 and sac-fry survival rate in F2 generation, indicating that PFOA resulted in multi-generational reproductive toxicity (p<0.05). Histologically, in F1 and F2 generations, O. latipes exposed to 30mg/L PFOA revealed accelerated gonad development, and the atrophy and degeneration of thyroid follicular cell...
June 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28674771/a-review-of-the-physiology-of-a-survival-expert-of-big-freeze-deep-snow-and-an-empty-stomach-the-boreal-raccoon-dog-nyctereutes-procyonoides
#12
REVIEW
Anne-Mari Mustonen, Petteri Nieminen
The raccoon dog (Nyctereutes procyonoides) is an invasive canid originating from eastern Asia. Here, we review its physiological adaptations to wintering, with an emphasis on northern Europe, where the raccoon dog spends the coldest part of the year in winter sleep. The timing of physiological changes related to wintering is connected to photoperiod by melatonin. In preparation to winter, raccoon dogs display autumnal hyperphagia and fattening probably regulated by the interaction of several peptide hormones...
July 4, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28673916/costs-and-benefits-of-group-living-in-primates-an-energetic-perspective
#13
REVIEW
A Catherine Markham, Laurence R Gesquiere
Group size is a fundamental component of sociality, and has important consequences for an individual's fitness as well as the collective and cooperative behaviours of the group as a whole. This review focuses on how the costs and benefits of group living vary in female primates as a function of group size, with a particular emphasis on how competition within and between groups affects an individual's energetic balance. Because the repercussions of chronic energetic stress can lower an animal's fitness, identifying the predictors of energetic stress has important implications for understanding variation in survivorship and reproductive success within and between populations...
August 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28662095/population-growth-is-limited-by-nutritional-impacts-on-pregnancy-success-in-endangered-southern-resident-killer-whales-orcinus-orca
#14
Samuel K Wasser, Jessica I Lundin, Katherine Ayres, Elizabeth Seely, Deborah Giles, Kenneth Balcomb, Jennifer Hempelmann, Kim Parsons, Rebecca Booth
The Southern Resident killer whale population (Orcinus orca) was listed as endangered in 2005 and shows little sign of recovery. These fish eating whales feed primarily on endangered Chinook salmon. Population growth is constrained by low offspring production for the number of reproductive females in the population. Lack of prey, increased toxins and vessel disturbance have been listed as potential causes of the whale's decline, but partitioning these pressures has been difficult. We validated and applied temporal measures of progesterone and testosterone metabolites to assess occurrence, stage and health of pregnancy from genotyped killer whale feces collected using detection dogs...
2017: PloS One
https://www.readbyqxmd.com/read/28658330/transaxillary-single-port-subtotal-parathyroidectomy-feasibility-study-in-cadavers
#15
Alexandre Elmães de Marsillac, Rossano Kepler Alvim Fiorelli, Henrique Neubarth Phillips, Pietro Novellino, André Lacerda Oliveira, Ricardo Paiva A Scheiba Zorron
Objective : to test the minimally invasive technique of single-port transaxillary subtotal parathyroidectomy in non-formalized cadavers to evaluate its viability and reproduction. Method : we performed ten subtotal parathyroidectomies through a transaxillary TriPort access in cadavers. The technique consisted of access through the axillary fossa, creating a subcutaneous tunnel to the anterior cervical region, for handling of the thyroid gland and dissection and resection of the parathyroid glands...
March 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/28649046/transgenerational-endocrine-disruption-and-neurotoxicity-in-zebrafish-larvae-after-parental-exposure-to-binary-mixtures-of-decabromodiphenyl-ether-bde-209-and-lead
#16
Lianguo Chen, Xianfeng Wang, Xiaohua Zhang, Paul K S Lam, Yongyong Guo, James C W Lam, Bingsheng Zhou
Polybrominated diphenyl ethers (PBDEs) and heavy metals are two key groups of electric and electronic equipment contaminants. Despite their co-occurrence in aquatic environments, their combined effects remain largely unknown, particularly under a chronic exposure regime. In the present study, adult zebrafish (Danio rerio) were exposed to environmentally relevant concentrations of BDE-209 and lead (Pb), or their binary mixtures, for 3 months. After chronic parental exposure, increased transfer of BDE-209 and Pb to the offspring eggs was activated in the coexposure groups, with BDE-197 being the predominant PBDE congener, indicating the dynamic metabolism of BDE-209 in parental zebrafish...
November 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28645579/anti-androgenic-mechanisms-of-bisphenol-a-involve-androgen-receptor-signaling-pathway
#17
Hui Wang, Zhen Ding, Qiao-Mei Shi, Xing Ge, Heng-Xue Wang, Meng-Xue Li, Gang Chen, Qi Wang, Qiang Ju, Jin-Peng Zhang, Mei-Rong Zhang, Li-Chun Xu
We have shown Bisphenol A (BPA) acts as an androgen receptor (AR) antagonist in the previous study. However, the mechanisms underlying anti-androgenic effects of BPA remain unclear. The objective of this study was to explore whether the AR signaling was involved in AR antagonism of BPA. The Cell Counting Kit-8 (CCK-8) assay and Real-Time Cell Analysis (RTCA) iCELLigence system were applied to analyze the mouse Sertoli cell TM4 proliferation. The mammalian two-hybrid assays were performed to investigate the effects of BPA on the AR amino- and carboxyl-terminal regions (N/C) interaction and the interactions of the AR with steroid receptor coactivator-1 (SRC-1), co-repressors including silencing mediator for thyroid hormone receptors (SMRT) and nuclear receptor co-repressor (NCoR)...
July 15, 2017: Toxicology
https://www.readbyqxmd.com/read/28635231/-comparison-of-paired-box-genes-8-and-2-expression-in-epithelium-tissues-and-the-related-tumors
#18
Y Song, X Huang, G H Shen, X Y Liu, X Zhang
Objective: To explore the expressional differences between paired box genes 2(Pax2) and 8 (Pax8) protein in different kinds of epitheliums and tumors, and to investigate the clinicopathologic significance. Methods: Expression levels of Pax2 and Pax8 protein were detected in 75 cases of different human epithelium tissues and 255 cases of different tumors on tissue microarray by immunohistochemistry. Results: Pax2 and Pax8 selectively expressed in different tissues. The positive rates of Pax8 protein expressed in the normal epithelium of the thyroid, urinary system and female reproductive system were 100% (2/2), 60...
June 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28630022/lamprey-metamorphosis-thyroid-hormone-signaling-in-a-basal-vertebrate
#19
REVIEW
Richard G Manzon, Lori A Manzon
As one of the most basal living vertebrates, lampreys represent an excellent model system to study the evolution of thyroid hormone (TH) signaling. The lamprey hypothalamic-pituitary-thyroid and reproductive axes overlap functionally. Lampreys have 3 gonadotropin releasing hormones and a single glycoprotein hormone from the hypothalamus and pituitary, respectively, that regulate both the reproductive and thyroid axes. TH synthesis in larval lampreys takes place in an endostyle that transforms into typical vertebrate thyroid tissue during metamorphosis; both the endostyle and follicular tissue have all the typical TH synthetic components found in other vertebrates...
June 16, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28627816/spectrophotometric-determination-of-selenium-through-triiodide-anion
#20
Otilia Bizerea-Spiridon, Radu Nartita, Alexandru F Rogobete, Adina Negrea, Ramona Stroescu, Teofana O Bizerea, Constantin Ilie, Otilia Marginean
BACKGROUND: Selenium is a chemical element found in the human body that plays a crucial role in its regulation. Depending on the concentration, it may have beneficial or have toxic effects. Selenium is incorporated as selenocysteine amino acid residue in selenoproteins which play an important role in many biological functions: anti-oxidant defense, regulation of the immune function and of the inflammatory response, metabolism of thyroid hormones, functioning of the central nervous system, biosynthesis of DNA and RNA, fertility, and reproduction...
May 1, 2017: Clinical Laboratory
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