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https://www.readbyqxmd.com/read/29783136/occurrence-and-estrogenic-activity-of-steroid-hormones-in-chinese-streams-a-nationwide-study-based-on-a-combination-of-chemical-and-biological-tools
#1
Bo Yao, Rui Li, Shuwen Yan, Shen-An Chan, Weihua Song
Steroid hormones (SHs) are continuously released into the aquatic environment through various pathways after being excreted by humans and animals, interfere with the normal function of the endocrine system and may affect the physiology and reproduction of exposed aquatic life. To conduct a nationwide investigation of the occurrence and biological effects of SHs in surface river/steam water in China, we quantitated 27 selected SHs in 217 surface water samples by solid-phase extraction (SPE) tandem LC-MS/MS and used a recombinant yeast estrogen assay to screen extracts of the water samples for estrogenic activities...
May 18, 2018: Environment International
https://www.readbyqxmd.com/read/29783106/prediction-of-the-combined-effects-of-multiple-estrogenic-chemicals-on-mcf-7-human-breast-cancer-cells-and-a-preliminary-molecular-exploration-of-the-estrogenic-proliferative-effects-and-related-gene-expression
#2
Shengwu Yuan, Chao Huang, Xiaoya Ji, Mei Ma, Kaifeng Rao, Zijian Wang
The environmental risks of environmental estrogens (EEs) are often assessed via the same mode of action in the concentration addition (CA) model, neglecting the complex combined mechanisms at the genetic level. In this study, the cell proliferation effects of estrone, 17α-ethinylestradiol, 17β-estradiol, estriol, diethylstilbestrol, estradiol valerate, bisphenol A, 4-tert-octylphenol and 4-nonylphenol were determined individually using the CCK-8 method, and the proliferation effects of a multicomponent mixture of estrogenic chemicals mixed at equipotent concentrations using a fixed-ratio design were studied using estrogen-sensitive MCF-7 cells...
May 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29783074/fsh-receptor-binding-inhibitor-restrains-follicular-development-and-possibly-attenuates-carcinogenesis-of-ovarian-cancer-through-down-regulating-expression-levels-of-fshr-and-er%C3%AE-in-normal-ovarian-tissues
#3
Gong Zhuandi, Che Tuanjie, Lai Luju, Ayimuguli Abdiryim, Deng Yingying, Liang Haoqin, Wei Suocheng, Ding Li
OBJECTIVES: The current study aimed to investigate FSH receptor binding inhibitor (FRBI) effects in the expressions of FSH receptor (FSHR) and estrogen receptor-beta (ERβ) in the mice ovaries at the gene and protein levels, also to find the potential efficacy of FRBI on suppressing ovarian cancer through down-regulating over-expression of FSHR and ERβ in the normal ovarian tissues. METHODS: 180 female mice were randomized into six groups (n = 30). Mice of FRBI-1, FRBI-2 and FRBI-3, FRBI-4 were intramuscularly injected with FRBI of 10, 20, 30 and 40 mg/kg, respectively, for five consecutive days...
May 18, 2018: Gene
https://www.readbyqxmd.com/read/29783047/stroma-cell-derived-factor-1-and-connexins-37-and-43-are-preserved-after-vitrification-and-in-vitro-culture-of-goat-ovarian-cortex
#4
Nathalie Jiatsa Donfack, Kele Amaral Alves, Benner Geraldo Alves, Rebeca Magalhães Pedrosa Rocha, Jamily Bezzera Bruno, Marcelo Bertolini, Regiane Rodrigues Dos Santos, Sheyla Farhaydes Souza Domingues, José Ricardo De Figueiredo, Johan Smitz, Ana Paula Ribeiro Rodrigues
This study aimed to evaluate the follicular morphology and development (follicular activation, cell proliferation, and hormone production), as well as the distribution pattern of Connexins 37 and 43 and SDF-1α after vitrification and in vitro culture of goat ovarian tissue. The study involved four experimental groups: fresh control, vitrified control, fresh culture and vitrified culture. The ovarian fragments were vitrified by a solid surface technique using the Ovarian Tissue Cryosystem and subsequently in vitro cultured for 7 days...
May 12, 2018: Theriogenology
https://www.readbyqxmd.com/read/29783015/extracts-of-compound-muniziqi-granule-suppressed-uterus-contraction-and-ameliorated-oxytocin-inducedprimary-dysmenorrhea
#5
Yue Wei, Tingyun Ma, Hanxue Wang, Jianguo Xing, Yuwen Wang, Zhengyi Gu, Dandan Mu, Qiang Yin, Xuemei Cheng, Changhong Wang
ETHNOPHARMACOLOGICAL RELEVANCE: Compound Muniziqi granule (CMG) is usually used as a traditional Uighur medicine to treat acne, chloasma, skin inflammation, primary dysmenorrhea (PDM), and menopausal syndrome. However, there are no sufficient data to support the clinic uses of CMG in PDM. AIM OF THE STUDY: This work aims to examine the effect of CMG as a treatment for PDM and reveal its possible therapeutic mechanism. MATERIALS AND METHODS: In vivo and in vitro mouse PDM models were utilized in this study...
May 18, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29782911/estrogen-deficiency-exacerbates-a%C3%AE-induced-memory-impairment-through-enhancement-of-neuroinflammation-amylodogenesis-and-nf-%C3%A4-b-activation-in-ovariectomized-mice
#6
Jaesuk Yun, In Jun Yeo, Chul Ju Hwang, Dong-Young Choi, Hyung-Sik Im, Ji Youg Kim, Won Rak Choi, Myung Hee Jung, Sang-Bae Han, Jin Tae Hong
Estrogen is well known to have a preventative effect in Alzheimer's disease (AD) pathology. Several studies have demonstrated that nuclear factor kappa-B (NF-ĸB) can contribute to the effects of estrogen on the development of AD. We investigated whether NF-ĸB affects amyloid-beta (Aβ)-induced memory impairment in an estrogen-lacking condition. In the present study, nine-week-old Institute cancer research (ICR) mice were ovariectomized to block estrogen stimulation. Ten weeks after the ovariectomization, mice were administered with Aβ (300 pmol) via intracerebroventricular (ICV) infusion for 2 weeks...
May 18, 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29782225/a-comparison-of-reproductive-and-energetic-states-in-a-marine-apex-predator-the-tiger-shark-galeocerdo-cuvier
#7
Neil Hammerschlag, Rachel A Skubel, James Sulikowski, Duncan J Irschick, Austin J Gallagher
To fuel the high energetic demands of reproduction, vertebrates employ different tactics of resource use. Large sharks exhibit long gestation periods and have relatively few well-developed young, which likely incurs high energetic costs. However, information on the relationship between the reproductive and energetic states for most shark species is lacking. In the present study, we used a noninvasive approach to assess relationships among reproductive stage, plasma triglyceride levels, body condition, and circulating reproductive hormones in free-ranging female tiger sharks (Galeocerdo cuvier)...
July 2018: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29781507/effect-of-estradiol-on-fibroblasts-from-postmenopausal-idiopathic-carpal-tunnel-syndrome-patients
#8
Yoshiaki Yamanaka, Kunitaka Menuki, Takafumi Tajima, Yasuaki Okada, Kenji Kosugi, Yukichi Zenke, Akinori Sakai
Fibrosis of the subsynovial connective tissue (SSCT) is a characteristic finding in patients with idiopathic carpal tunnel syndrome (CTS). Idiopathic CTS frequently occurs in postmenopausal women; therefore, female steroid hormones, especially estrogens, may be involved in its development. In this study, we evaluated the effect of the estradiol on the expression of genes and proteins related to fibrosis of SSCT fibroblasts from patients with idiopathic CTS. This study included 10 postmenopausal women (mean age 76 years)...
May 21, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29779845/effects-of-estradiol-on-lactoprivic-signaling-of-the-hindbrain-upon-the-contraregulatory-hormonal-response-and-metabolic-neuropeptide-synthesis-in-hypoglycemic-female-rats
#9
Santosh K Mandal, Prem K Shrestha, Fahaad S H Alenazi, Manita Shakya, Hussain N Alhamami, Karen P Briski
BACKGROUND: Caudal dorsomedial hindbrain detection of hypoglycemia-associated lactoprivation regulates glucose counter-regulation in male rats. In females, estradiol (E) determines hypothalamic neuroanatomical and molecular foci of hindbrain energy sensor activation. This study investigated the hypothesis that E signal strength governs metabolic neuropeptide and counter-regulatory hormone responses to hindbrain lactoprivic stimuli in hypoglycemic female rats. METHODS: Ovariectomized animals were implanted with E-filled silastic capsules [30 (E-30) or 300 μg (E-300)/mL] to replicate plasma concentrations at estrous cycle nadir versus peak levels...
May 17, 2018: Neuropeptides
https://www.readbyqxmd.com/read/29779566/hormonal-contraception-and-breast-cancer
#10
Carolyn L Westhoff, Malcolm C Pike
The recent Danish cohort study reported a 20% increased risk of breast cancer among current and recent hormonal contraception users. These results are largely consistent with previous studies. This study did not report on stage of disease at diagnosis and it is not clear to what extent the apparent increased risk may be due to a small advance in the timing of diagnosis. This study did not report on the risk associated with the use of a 20-μg ethinyl estradiol pill. They did find an increasing risk in current users of longer duration and an increased risk with use of the levonorgestrel intrauterine system-both of these potentially important findings have not been consistently found in previous studies and require further investigation...
May 17, 2018: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29779488/bisphenol-a-induced-endocrinotoxicity-and-male-reprotoxicopathy-is-modulated-by-the-dietary-iron-deficiency
#11
Hina Rashid, Shikha Sharma, Saba Beigh, Firoz Ahmad, Sheikh Raisuddin
INTRODUCTION: Bisphenol A (BPA) is suspected to cause hormonal imbalance in humans. Dietary factors are known to bring changes in hormonal profile. In order to study chemico-biological interaction of iron deficiency on toxicity outcome of BPA exposure, we studied the modulatory effects of iron deficiency on the hormone levels in rats chronically-exposed to BPA. METHODS: Weanling rats maintained on normal and iron-deficient diets were exposed to low level of BPA at 0, 1, 5 and 10 ppm for six months through drinking water...
May 20, 2018: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/29778464/peroxiredoxin-2-deficiency-accelerates-age-related-ovarian-failure-through-the-reactive-oxygen-species-mediated-jnk-pathway-in-mice
#12
Sun-Ji Park, Jung-Hak Kim, Dong Gil Lee, Jin-Man Kim, Dong-Seok Lee
Reactive oxygen species (ROS) produced in biological reactions have been shown to contribute to ovarian aging. Peroxiredoxin 2 (Prx2) is an antioxidant enzyme that protects cells by scavenging ROS; however, its effect on age-related, oxidative stress-associated ovarian failure has not been reported. Here, we investigated its role in age-related ovarian dysfunction and 4-vinylcyclohexene diepoxide (VCD)-induced premature ovarian failure using Prx2-deficient mice. Compared to those in wildtype (WT) mice, serum levels of anti-Müllerian hormone, 17β-estradiol, and progesterone and numbers of follicles and corpora lutea were significantly lower in 18-month-old Prx2-/- mice...
May 17, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29778461/average-ovarian-hormone-levels-rather-than-daily-values-and-their-fluctuations-are-related-to-facial-preferences-among-women
#13
Urszula M Marcinkowska, Gwenael Kaminski, Anthony C Little, Grazyna Jasienska
Hormones are of crucial importance for human behavior. Cyclical changes of ovarian hormones throughout women's menstrual cycle are suggested to underlie fluctuation in masculinity preference for both faces and bodies. In this study we tested this hypothesis based on daily measurements of estradiol and progesterone throughout menstrual cycle, and multiple measurements of women's preference towards masculinity of faces and bodies of men. We expected that due to a large variation among daily hormonal levels we would not observe a direct effect of daily hormone levels, but rather that average levels of ovarian hormones throughout the cycle (a reliable marker of a probability of conception) would better predict women's preferences...
May 17, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29778392/ultrasound-guided-follicle-aspiration-at-time-of-laparotomy-in-a-patient-with-mayer-rokitansky-k%C3%A3-ster-hauser-syndrome
#14
Ashley M Eskew, Darcy E Broughton, Maureen B Schulte, Kenan R Omurtag, Randall R Odem
OBJECTIVE: To demonstrate a unique case of direct ultrasound-guided follicle aspiration at time of a laparotomy in a patient with Mayer-Rokitansky-Küster-Hauser Syndrome. DESIGN: Video presentation. SETTING: Academic fertility center PATIENT(S): A 32-year-old gravida 0 with Mayer-Rokitansky-Küster-Hauser Syndrome and bilateral ovarian masses presented as a fertility preservation consult from gynecologic oncology due to the possibility of bilateral oophorectomy...
May 2018: Fertility and Sterility
https://www.readbyqxmd.com/read/29778271/evaluation-of-environmental-effects-on-reproductive-characteristics-of-mangalarga-marchador-mares-in-a-commercial-embryo-transfer-program
#15
Miguel Alejandro Silva Rua, Celia Raquel Quirino, Ana Cláudia Cerqueira Rodrigues, Mirela Mendes Christo, Marcus Antônio Pessanha Barreto
The objective of this study was to evaluate the environmental effects on embryo recovery rate and pregnancy rate of Mangalarga Marchador mares. The reproductive characteristics of donor and recipient mares were evaluated during five years in Brazilian tropical environment. The mares were used throughout the year and seasons were classified as: October to April (breeding season - BS); May (autumn transition out of the breeding season - ATBS); June to August (non-breeding season - nBS); and September (vernal transition into the breeding season - VTBS)...
May 15, 2018: Animal Reproduction Science
https://www.readbyqxmd.com/read/29777688/proteomic-changes-during-adult-stage-in-pre-optic-hypothalamus-hippocampus-and-pituitary-regions-of-female-rat-brain-following-neonatal-exposure-to-estradiol-17%C3%AE
#16
Vijayakumar Govindaraj, Radhika Nagamangalam Shridharan, Addicam Jagannadha Rao
Although neonatal exposure to estrogen or estrogenic compounds results in irreversible changes in the brain function and reproductive abnormalities during adulthood but the underlying mechanisms are still largely unknown. The present study has attempted to compare the protein profiles of sexually dimorphic brain regions of adult female rats which were exposed to estradiol- 17β during neonatal period. The total proteins extracted from pre-optic area (POA), hypothalamus, hippocampus and pituitary of control and neonatally E2 treated female rats was subjected to 2D-SDS-PAGE and differentially expressed proteins were identification by MALDI TOF/TOF-MS...
May 16, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29777495/ameliorative-effect-of-ginseng-extract-on-phthalate-and-bisphenol-a-reprotoxicity-during-pregnancy-in-rats
#17
Islam M Saadeldin, Mohamed A Hussein, Aida Hamid Suleiman, Mahmoud G Abohassan, Mona M Ahmed, Amr A Moustafa, Abdullah F Moumen, Ayman Abdel-Aziz Swelum
Phthalates (such as DEHP) and bisphenol A (BPA) are widely used chemicals in plastics manufacturing and exert public health concerns as endocrine disrupters. This study was designed to investigate the deleterious effect of DEHP and BPA on endocrine profile of pregnant female rats and the combined treatment with ginseng extract (Panax ginseng). Seventy-two pregnant rats were divided into six groups (control, ginseng, DEHP, BPA, Gin + DEHP, and Gin + BPA), 12 females per each group. The drugs were supplemented from pregnancy day 0 until day 20...
May 18, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29777410/startling-differences-using-the-acoustic-startle-response-to-study-sex-differences-and-neurosteroids-in-affective-disorders
#18
REVIEW
Liisa Hantsoo, Carla E M Golden, Sara Kornfield, Christian Grillon, C Neill Epperson
PURPOSE OF REVIEW: Neuroactive steroid hormones, such as estradiol and progesterone, likely play a role in the pathophysiology of female-specific psychiatric disorders such as premenstrual dysphoric disorder (PMDD) and postpartum depression and may contribute to the marked sex differences observed in the incidence and presentation of affective disorders. However, few tools are available to study the precise contributions of these neuroactive steroids (NSs). In this review, we propose that the acoustic startle response (ASR), an objective measure of an organism's response to an emotional context or stressor, is sensitive to NSs...
May 18, 2018: Current Psychiatry Reports
https://www.readbyqxmd.com/read/29777228/effects-of-clomiphene-citrate-on-male-obesity-associated-hypogonadism-a-randomized-double-blind-placebo-controlled-study
#19
Andressa Heimbecher Soares, Nidia Celeste Horie, Lucas Augusto Piccinin Chiang, Bruno Caramelli, Mariana Gomes Matheus, Alexandre Holthausen Campos, Luciana Cavalheiro Marti, Fernanda Agostini Rocha, Marcio C Mancini, Elaine Maria Frade Costa, Cintia Cercato
BACKGROUND: Obesity causes secondary hypogonadism (HG) in men. Standard testosterone (T) replacement therapy improves metabolic parameters but leads to infertility. OBJECTIVE: To evaluate clomiphene citrate (CC) treatment of adult men with male obesity-associated secondary hypogonadism (MOSH). DESIGN: Single-center, randomized, double-blind, placebo-controlled trial. PARTICIPANTS: Seventy-eight men aged 36.5 ± 7...
May 17, 2018: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29776996/effects-of-chronic-exposure-to-12%C3%A2-saltwater-on-the-endocrine-physiology-of-juvenile-american-alligator-alligator-mississippiensis
#20
P C Faulkner, M L Burleson, L Simonitis, C Marshall, D Hala, L H Petersen
American alligator ( Alligator mississippiensis , Linnaeus) habitats are prone to saltwater intrusion following major storms, hurricanes or droughts. Anthropogenic impacts affecting hydrology of freshwater systems may exacerbate saltwater intrusion into freshwater habitats. The endocrine system of alligators is susceptible to changes in the environment but it is currently not known how the crocodilian physiological system responds to environmental stressors such as salinity. Juvenile alligators were exposed to 12‰ saltwater for 5 weeks to determine effects of chronic exposure to saline environments...
May 18, 2018: Journal of Experimental Biology
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