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https://www.readbyqxmd.com/read/28342855/regulation-of-reproduction-via-tight-control-of-gonadotropin-hormone-levels
#1
Djurdjica Coss
Mammalian reproduction is controlled by the hypothalamic-pituitary-gonadal axis. GnRH from the hypothalamus regulates synthesis and secretion of gonadotropins, LH and FSH, which then control steroidogenesis and gametogenesis. In females, serum LH and FSH levels exhibit rhythmic changes throughout the menstrual or estrous cycle that are correlated with pulse frequency of GnRH. Lack of gonadotropins leads to infertility or amenorrhea. Dysfunctions in the tightly controlled ratio due to levels slightly outside the normal range occur in a larger number of women and are correlated with polycystic ovaries and premature ovarian failure...
March 22, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28342833/a-high-density-cho-s-transient-transfection-system-comparison-of-expicho-and-expi293
#2
Nina K Jain, Susan Barkowski-Clark, Richard Altman, Krista Johnson, Fang Sun, Jonathan Zmuda, Chao Yan Liu, Adriana Kita, Ryan Schulz, Alyssa Neill, Robert Ballinger, Rekha Patel, Jian Liu, Alinafe Mpanda, Brian Huta, Henry Chiou, Walter Voegtli, Tadas Panavas
Chinese Hamster Ovary (CHO) cells are the principal mammalian host used for stable cell line generation and biotherapeutic protein production. Until recently, production of milligrams to grams of protein in CHO transient systems was challenging. As such, Human Embryonic Kidney (HEK293) cells are the most common mammalian cell type used for transient transfection. The post-translational modifications (PTMs) of a protein are dictated in part by the cell line used for expression, and changes in PTMs have been shown to affect both the activity and biophysical properties of proteins...
March 22, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28340751/metal-oxide-based-dispersive-solid-phase-extraction-coupled-with-mass-spectrometry-analysis-for-determination-of-ribose-conjugates-in-human-follicular-fluid
#3
Jie-Mei Chu, Tai-Lang Yin, Shu-Jian Zheng, Jing Yang, Bi-Feng Yuan, Yu-Qi Feng
Polycystic ovary syndrome (PCOS) is the most common cause of anovulatory infertility. The pathogenesis of PCOS remains unclear and early diagnosis of PCOS is challenging. Follicular fluid provides a unique window in the critical processes during oocyte and follicular maturation, and the metabolic level of follicular fluid has important impact on the developmental potential of oocytes and subsequent embryos. Previous studies demonstrated some modified ribonucleosides in biological fluids were diseases related metabolites...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28337819/pai-1-in-granulosa-cells-is-suppressed-directly-by-statin-and-indirectly-by-suppressing-tgf-%C3%AE-and-tnf-%C3%AE-in-mononuclear-cells-by-insulin-sensitizing-drugs
#4
Kaori Yamada-Nomoto, Osamu Yoshino, Ikumi Akiyama, Akira Iwase, Yosuke Ono, Tomoko Nakamura, Miyuki Harada, Akitoshi Nakashima, Tomoko Shima, Akemi Ushijima, Yutaka Osuga, Russell Jeffrey Chang, Shunichi Shimasaki, Shigeru Saito
PROBLEM: Plasminogen activator inhibitor-1 (PAI-1) is elevated in women with polycystic ovary syndrome (PCOS), but the regulation in granulosa cells (GCs) is unclear. METHOD OF STUDY: PAI-1 expression in PCOS ovaries was investigated immunohistologically. PAI-1 expressions in HGrC1, a human GC cell line, were investigated at mRNA and activity levels. The expressions of TGF-β and TNF-α in peritoneal fluid mononuclear cells (PFMCs) were measured with quantitative PCR...
March 24, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/28336389/metformin-ameliorates-uterine-defects-in-a-rat-model-of-polycystic-ovary-syndrome
#5
Yuehui Zhang, Min Hu, Fanci Meng, Xiaoyan Sun, Hongfei Xu, Jiao Zhang, Peng Cui, Njomeza Morina, Xin Li, Wei Li, Xiao-Ke Wu, Mats Brännström, Ruijin Shao, Håkan Billig
Adult rats treated concomitantly with insulin and human chorionic gonadotropin exhibit endocrine, metabolic, and reproductive abnormalities that are very similar to those observed in polycystic ovary syndrome (PCOS) patients. In this study, we used this rat model to assess the effects of metformin on PCOS-related uterine dysfunction. In addition to reducing androgen levels, improving insulin sensitivity, and correcting the reproductive cycle, metformin treatment induced morphological changes in the PCOS-like uterus...
March 18, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28335466/a-specific-mixture-of-nutrients-suppresses-ovarian-cancer-a-2780-tumor-incidence-growth-and-metastasis-to-lungs
#6
Mohd Waheed Roomi, Tatiana Kalinovsky, Matthias Rath, Aleksandra Niedzwiecki
Ovarian cancer is the deadliest gynecological malignancy in women, and fifth leading cause of death. Despite advances made in chemotherapy and surgery, the average time of clinical remission is approximately 2 years and the 5-year survival rate is 45%. Thus, there is an urgent need for the development of a novel therapeutic approach to ovarian cancer treatment. We investigated the effect of a specific nutrient mixture (EPQ) containing ascorbic acid, lysine, proline, green tea extract, and quercetin on human ovarian cancer cell A-2780 in vivo and in vitro...
March 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28334957/quechers-based-method-for-pesticides-analysis-in-adipose-tissue-associated-with-rat-ovaries
#7
Nathalie Zamariola, Pedro Toledo Netto, Carla Adriene da Silva Franchi, João Lauro Viana de Camargo, Mary Rosa Rodrigues de Marchi
The concomitant exposure to low doses of various pesticides is one of the most relevant issues in human toxicology today. An experimental toxicology study was developed to evaluate the effects of this type of exposure on the reproductive capacity of females of three species of rats that were exposed to mixtures of dicofol, dieldrin, endosulfan and permethrin at low doses (LOAEL and NOAEL). In this context, we have developed a method for determining pesticides in adipose tissue (0.5 g, 49% lipid) associated with the ovaries, based on the QuEChERS (quick, easy, cheap, effective, rugged and safe) strategy...
March 14, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28333275/anti-m%C3%A3-llerian-hormone-inhibits-activation-and-growth-of-bovine-ovarian-follicles-in-vitro-and-is-localized-to-growing-follicles
#8
M Y Yang, R A Cushman, J E Fortune
STUDY QUESTION: Does anti-Müllerian hormone (AMH) inhibit activation (initiation of growth) of primordial follicles and attenuate the growth of primary follicles in cattle, an excellent animal model for human ovarian follicular development? SUMMARY ANSWER: AMH inhibited activation of bovine primordial follicles and attenuated the growth of activated follicles in vitro. WHAT IS KNOWN ALREADY: In mice null mutant for AMH, the pool of primordial follicles is depleted prematurely and AMH inhibits follicle activation in vitro...
March 17, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28333243/polycystic-ovary-syndrome-is-associated-with-anogenital-distance-a-marker-of-prenatal-androgen-exposure
#9
Yingchen Wu, Guangzheng Zhong, Shengfu Chen, Chengyu Zheng, Dehua Liao, Meiqing Xie
STUDY QUESTION: Is the presence of polycystic ovary syndrome (PCOS) associated with anogenital distance (AGD), a biomarker for the prenatal hormonal environment? SUMMARY ANSWER: The presence of PCOS is associated with longer AGD. WHAT IS KNOWN ALREADY: Although the aetiology of PCOS is unclear, emerging data suggest that the natural history of PCOS may originate from intrauterine life. Prenatal exposure to androgen hormones is considered an important factor of PCOS...
March 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28333238/clustering-of-pcos-like-traits-in-naturally-hyperandrogenic-female-rhesus-monkeys
#10
D H Abbott, B H Rayome, D A Dumesic, K C Lewis, A K Edwards, K Wallen, M E Wilson, S E Appt, J E Levine
STUDY QUESTION: Do naturally occurring, hyperandrogenic (≥1 SD of population mean testosterone, T) female rhesus monkeys exhibit traits typical of women with polycystic ovary syndrome (PCOS)? SUMMARY ANSWER: Hyperandrogenic female monkeys exhibited significantly increased serum levels of androstenedione (A4), 17-hydroxyprogesterone (17-OHP), estradiol (E2), LH, antimullerian hormone (AMH), cortisol, 11-deoxycortisol and corticosterone, as well as increased uterine endometrial thickness and evidence of reduced fertility, all traits associated with PCOS...
March 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28333125/clarity-reveals-dynamics-of-ovarian-follicular-architecture-and-vasculature-in-three-dimensions
#11
Yi Feng, Peng Cui, Xiaowei Lu, Brian Hsueh, Fredrik Möller Billig, Livia Zarnescu Yanez, Raju Tomer, Derek Boerboom, Peter Carmeliet, Karl Deisseroth, Aaron J W Hsueh
Optimal distribution of heterogeneous organelles and cell types within an organ is essential for physiological processes. Unique for the ovary, hormonally regulated folliculogenesis, ovulation, luteal formation/regression and associated vasculature changes lead to tissue remodeling during each reproductive cycle. Using the CLARITY approach and marker immunostaining, we identified individual follicles and corpora lutea in intact ovaries. Monitoring lifetime changes in follicle populations showed age-dependent decreases in total follicles and percentages of advanced follicles...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332312/antitumor-activity-of-chlpmab-2-a-human-mouse-chimeric-cancer-specific-antihuman-podoplanin-antibody-via-antibody-dependent-cellular-cytotoxicity
#12
Mika K Kaneko, Shinji Yamada, Takuro Nakamura, Shinji Abe, Yasuhiko Nishioka, Akiko Kunita, Masashi Fukayama, Yuki Fujii, Satoshi Ogasawara, Yukinari Kato
Human podoplanin (hPDPN), a platelet aggregation-inducing transmembrane glycoprotein, is expressed in different types of tumors, and it binds to C-type lectin-like receptor 2 (CLEC-2). The overexpression of hPDPN is involved in invasion and metastasis. Anti-hPDPN monoclonal antibodies (mAbs) such as NZ-1 have shown antitumor and antimetastatic activities by binding to the platelet aggregation-stimulating (PLAG) domain of hPDPN. Recently, we developed a novel mouse anti-hPDPN mAb, LpMab-2, using the cancer-specific mAb (CasMab) technology...
March 23, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28328856/the-influence-of-different-growth-hormone-addition-protocols-to-poor-ovarian-responders-on-clinical-outcomes-in-controlled-ovary-stimulation-cycles-a-systematic-review-and-meta-analysis
#13
Xue-Li Li, Li Wang, Fang Lv, Xia-Man Huang, Li-Ping Wang, Yu Pan, Xiao-Mei Zhang
BACKGROUND: Growth hormone (GH) is used as an adjuvant therapy in in vitro fertilization and embryo transfer (IVF-ET) for poor ovarian responders, but findings for its effects on outcomes of IVF have been conflicting. The aim of the study was to compare IVF-ET outcomes among women with poor ovarian responders, and find which subgroup can benefit from the GH addition. METHODS: We searched the databases, using the terms "growth hormone," "GH," "IVF," "in vitro fertilization...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28327540/endocrine-disrupting-chemicals-and-endometrial-cancer-an-overview-of-recent-laboratory-evidence-and-epidemiological-studies
#14
REVIEW
Maddalena Mallozzi, Chiara Leone, Francesca Manurita, Filippo Bellati, Donatella Caserta
Background: Although exposure to endocrine disruptor compounds (EDCs) has been suggested as a contributing factor to a range of women's health disorders including infertility, polycystic ovaries and the early onset of puberty, considerable challenges remain in attributing cause and effect on gynaecological cancer. Until recently, there were relatively few epidemiological studies examining the relationship between EDCs and endometrial cancer, however, in the last years the number of these studies has increased...
March 22, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28327103/morphological-and-phenotypical-features-of-ovarian-metastases-in-breast-cancer-patients
#15
Inge T A Peters, Merle A van der Steen, Bertine W Huisman, Carina G J M Hilders, Vincent T H B M Smit, Alexander L Vahrmeijer, Cornelis F M Sier, J Baptist Trimbos, Peter J K Kuppen
BACKGROUND: Autotransplantation of frozen-thawed ovarian tissue is a method to preserve ovarian function and fertility in patients undergoing gonadotoxic therapy. In oncology patients, the safety cannot yet be guaranteed, since current tumor detection methods can only exclude the presence of malignant cells in ovarian fragments that are not transplanted. We determined the need for a novel detection method by studying the distribution of tumor cells in ovaries from patients with breast cancer...
March 21, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28323945/coordinated-regulation-among-progesterone-prostaglandins-and-egf-like-factors-in-human-ovulatory-follicles
#16
Yohan Choi, Kalin Wilson, Patrick R Hannon, Katherine L Rosewell, Mats Brännström, James W Akin, Thomas E Curry, Misung Jo
CONTEXT: In animal models, the LH surge increases progesterone (P4)/its receptor (PGR), prostaglandins (PTGs), and epidermal growth factor (EGF)-like factors that play essential roles in ovulation. However, little is known about the expression, regulation, and function of these key ovulatory mediators in humans. OBJECTIVES: To determine when and how these key ovulatory mediators are induced after the luteinizing hormone surge in human ovaries. DESIGN AND PARTICIPANTS: Timed periovulatory follicles were obtained from cycling women...
March 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323907/resveratrol-inhibits-androgen-production-of-human-adrenocortical-h295r-cells-by-lowering-cyp17-and-cyp21-expression-and-activities
#17
Nesa Marti, Nadia Bouchoucha, Kay-Sara Sauter, Christa E Flück
Resveratrol, a natural compound found in grapes, became very popular for its suggested protective effects against aging. It was reported to have similar positive effects on the human metabolism as caloric restriction. Recently, positive effects of resveratrol on steroid biosynthesis in cell systems and in humans suffering from polycystic ovary syndrome have also been reported, but the exact mechanism of this action remains unknown. Sirtuins seem targeted by resveratrol to mediate its action on energy homeostasis...
2017: PloS One
https://www.readbyqxmd.com/read/28319674/assessment-of-circulating-betatrophin-concentrations-in-lean-glucose-tolerant-women-with-polycystic-ovary-syndrome
#18
Onur Erol, Mustafa Kemal Özel, Hamit Yaşar Ellidağ, Tayfun Toptaş, Aysel Uysal Derbent, Necat Yılmaz
The aims of the current study were to investigate the betatrophin levels in lean glucose-tolerant women with polycystic ovary syndrome (PCOS), and to explore the relationships between these levels and antropometric, hormonal and metabolic parameters. The study population consisted of 50 lean (body mass index [BMI] < 25 kg/m(2)) women diagnosed with PCOS using the Rotterdam criteria, and 60 age- and BMI-matched healthy controls without any features of clinical or biochemical hyperandrogenism. Before recruitment, glucose tolerance was evaluated in all of the subjects using the 2-h 75 g oral glucose-tolerance test, and only those exhibiting normal glucose tolerance were enrolled...
March 20, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28304148/the-enigmatic-role-of-runx1-in-female-related-cancers-current-knowledge-future-perspectives
#19
REVIEW
Alessandra I Riggio, Karen Blyth
Historically associated with the aetiology of human leukaemia, the RUNX1 gene has in recent years reared its head in an assortment of epithelial cancers. This review discusses the state-of-the-art knowledge of the enigmatic role played by RUNX1 in female-related cancers of the breast, the uterus and the ovary. The weight of evidence accumulated so far is indicative of a very context-dependent role, as either an oncogene or a tumour suppressor. This is corroborated by high-throughput sequencing endeavours which report different genetic alterations affecting the gene, including amplification, deep deletion and mutations...
March 17, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28302175/prolonged-hypothyroidism-severely-reduces-ovarian-follicular-reserve-in-adult-rats
#20
Li Meng, Eddy Rijntjes, Hans J M Swarts, Jaap Keijer, Katja J Teerds
BACKGROUND: There is substantial evidence both in humans and in animals that a prolonged reduction in plasma thyroid hormone concentration leads to reproductive problems, including disturbed folliculogenesis, impaired ovulation and fertilization rates, miscarriage and pregnancy complications. The objective of the present study is to examine the consequences of chronic hypothyroidism, induced in adulthood, for the size of the ovarian follicle pool. In order to investigate this, adult female rats were provided either a control or an iodide deficient diet in combination with perchlorate supplementation to inhibit iodide uptake by the thyroid...
March 16, 2017: Journal of Ovarian Research
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