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https://www.readbyqxmd.com/read/29471436/antiandrogen-treatment-ameliorates-reproductive-and-metabolic-phenotypes-in-the-letrozole-induced-mouse-model-of-pcos
#1
Genevieve E Ryan, Shaddy Malik, Pamela L Mellon
Polycystic ovary syndrome (PCOS), the most common endocrinopathy in women of reproductive age, is characterized by hyperandrogenism, anovulation, and polycystic ovaries. Although its etiology is unknown, excess androgens are thought to be a critical factor driving the pathology of PCOS. We previously demonstrated that continuous exposure to the aromatase inhibitor letrozole (LET) in mice produces many hallmarks of PCOS, including elevated testosterone (T) and luteinizing hormone (LH), anovulation, and obesity...
February 19, 2018: Endocrinology
https://www.readbyqxmd.com/read/29471425/foxl2c134w-induced-cyp19-expression-via-cooperation-with-smad3-in-hgrc1-cells
#2
Martina Belli, Nahoko Iwata, Tomoko Nakamura, Akira Iwase, Dwayne Stupack, Shunichi Shimasaki
Germline knockout studies in female mice demonstrated an essential role for FOXL2 in early follicle development, while an inducible granulosa cell (GC) specific deletion of Foxl2 in adults has shown ovary-to-testis somatic sex reprogramming. In women, over 120 different germline mutations in the FOXL2 gene have been shown to cause blepharophimosis/ptosis/epicantus inversus syndrome associated with or without primary ovarian insufficiency. By contrast, a single somatic mutation (FOXL2C134W) accounts for almost all adult-type GC tumors (aGCTs)...
February 19, 2018: Endocrinology
https://www.readbyqxmd.com/read/29470953/cat-preantral-follicle-survival-after-prolonged-cooled-storage-followed-by-vitrification
#3
Jorge Luis Araújo Martins, Maria Denise Lopes, Fabiana Ferreira de Souza, Fabio Sossai Possebon, Gudrun Wibbelt, Katarina Jewgenow
The aim of this study was to investigate the impact of prolonged storage at 4 °C on survival of cat preantral follicles (PAFs) pre- and post-vitrification. Ovaries were obtained from 12 queens and transported at 4 ºC within 2-6 h. Parts of the ovaries were stored for an additional 24 h or 72 h. The ovarian cortex was dissected, analyzed for viability (neutral red - NR) and morphology (histology - HE and ultrastructural analysis by TEM) and vitrified. We used 2 mm biopsy punches to obtain equal size pieces as the experimental units...
February 19, 2018: Cryobiology
https://www.readbyqxmd.com/read/29466757/quiescent-tissue-stem-cells-evade-immune-surveillance
#4
Judith Agudo, Eun Sook Park, Samuel A Rose, Eziwoma Alibo, Robert Sweeney, Maxime Dhainaut, Koichi S Kobayashi, Ravi Sachidanandam, Alessia Baccarini, Miriam Merad, Brian D Brown
Stem cells are critical for the maintenance of many tissues, but whether their integrity is maintained in the face of immunity is unclear. Here we found that cycling epithelial stem cells, including Lgr5+ intestinal stem cells, as well as ovary and mammary stem cells, were eliminated by activated T cells, but quiescent stem cells in the hair follicle and muscle were resistant to T cell killing. Immune evasion was an intrinsic property of the quiescent stem cells resulting from systemic downregulation of the antigen presentation machinery, including MHC class I and TAP proteins, and is mediated by the transactivator NLRC5...
February 20, 2018: Immunity
https://www.readbyqxmd.com/read/29465156/the-impact-of-serum-adropin-and-ischemia-modified-albumin-levels-based-on-bmi-in-pcos
#5
Zeynep Ozturk Inal, Sami Erdem, Yavuz Gederet, Cevdet Duran, Zehra Kucukaydin, Huseyin Kurku, Derya Kilic Sakarya
INTRODUCTION: The aim of this study was to evaluate the effects of polycystic ovary syndrome (PCOS) and body mass index (BMI) on serum adropin and ischemia modified albumin (IMA) levels. MATERIALS AND METHODS: This prospective cross-sectional study was performed with a total of 120 women [group1; non-PCOS = 60 (BMI <25 = 30, BMI ≥25 = 30) and group 2; PCOS = 60 (BMI <25 = 30, BMI ≥25 = 30)]. Blood samples were collected between the third and fifth days of the women's menstrual cycles after a night of fasting...
February 21, 2018: Endokrynologia Polska
https://www.readbyqxmd.com/read/29463151/the-role-of-fto-variants-in-the-susceptibility-of-polycystic-ovary-syndrome-and-in-vitro-fertilization-outcomes-in-chinese-women
#6
Ai Ling Liu, Hong Qing Liao, Jing Zhou, Yu Lin Nie, Cui Lan Zhou, Zhi Liang Li, Zi Fen Guo, Dong Xiu He, Yun Hua Zhu, Cui Ying Peng
We investigated the association between single nucleotide polymorphisms (SNPs) in the fat mass and obesity associated (FTO) gene (rs9926289 A/G, rs79206939 A/G, rs9930506 A/G, rs8050136 A/C, and rs1588413 C/T) and polycystic ovary syndrome (PCOS), as well as outcomes of in vitro fertilization (IVF). A case-control study consisting of 147 PCOS patients and 120 healthy controls was conducted. FTO SNPs were genotyped by PCR to determine allelic frequencies, and IVF outcomes were analyzed. The results showed that FTO rs8050136 (p = ...
February 20, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29462422/multidrug-resistance-protein-1-deficiency-promotes-doxorubicin-induced-ovarian-toxicity-in-female-mice
#7
Yingzheng Wang, Mingjun Liu, Jiyang Zhang, Yuwen Liu, Megan Kopp, Weiwei Zheng, Shuo Xiao
Multidrug resistance protein 1 (MDR1), a phase III drug transporter that exports substrates out of cells, has been discovered in both cancerous and normal tissues. The over expression of MDR1 in cancer cells contributes to multiple drug resistance, whereas the MDR1 in normal tissues protects them from chemical-induced toxicity. Currently, the role of MDR1 in the ovary has not been entirely understood. Our objective is to determine the function of MDR1 in protecting against chemotherapy-induced ovarian toxicity...
February 15, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29454297/intracytoplasmic-sperm-injection-icsi-of-in-vitro-matured-oocytes-with-stored-epididymal-spermatozoa-in-camel-camelus-dromedarius-effect-of-exogenous-activation-on-in-vitro-embryo-development
#8
Nisar A Wani, Seungbum Hong
Experiments were conducted to investigate the development of in vitro matured camel oocytes after their intra-cytoplasmic sperm injection (ICSI) with epididymal sperm collected from slaughtered male camels. Ovaries and testes were collected from a local slaughterhouse in normal saline solution (NSS) at 37 °C and on ice (0-1 °C), respectively. Cumulus-oocyte complexes (COCs) aspirated from the follicles were randomly distributed to 4-well culture plates (20-25 COCs/well) containing 500 μL of maturation medium and cultured at 38...
February 8, 2018: Theriogenology
https://www.readbyqxmd.com/read/29452853/the-impact-of-sex-steroid-agonists-and-antagonists-on-folliculogenesis-in-the-neonatal-porcine-ovary-via-cell-proliferation-and-apoptosis
#9
Katarzyna Knapczyk-Stwora, Malgorzata Grzesiak, Renata E Ciereszko, Elzbieta Czaja, Marek Koziorowski, Maria Slomczynska
The objective of the study was to examine the effects of androgen and estrogen agonists or antagonists on the follicle formation, ovarian cell proliferation and apoptosis as well as plasma steroid concentration in neonatal pigs. Piglets were injected with testosterone propionate (TP, 20 mg/kg bw), flutamide (FLU, 50 mg/kg bw), 4-tert-octylphenol (OP, 100 mg/kg bw), ICI 182,780 (ICI, 400 μg/kg bw), methoxychlor (MXC, 100 mg/kg bw) or corn oil (CTR, controls) between postnatal Days 1 and 10 (n = 4/group). Heart blood was collected and ovaries were excised from the 11-day-old piglets...
February 10, 2018: Theriogenology
https://www.readbyqxmd.com/read/29452791/untapped-reserves-controlling-primordial-follicle-growth-activation
#10
REVIEW
Amanda Kallen, Alex J Polotsky, Joshua Johnson
Even with the benefit of assisted reproductive technologies (ART), many women are unable to conceive and deliver healthy offspring. One common cause of infertility is the inability to produce eggs capable of contributing to live birth. This can occur despite standard-of-care treatment to maximize the recovery of eggs from growing ovarian follicles. Dormant primordial follicles in the human ovary are a 'reserve ' that can be exploited clinically to overcome this problem. We discuss how controlling primordial follicle growth activation (PFGA) can produce increased numbers of high-quality eggs available for fertility treatment(s)...
February 13, 2018: Trends in Molecular Medicine
https://www.readbyqxmd.com/read/29450927/histological-and-immunohistochemical-evaluation-of-granulosa-cells-during-different-stages-of-folliculogenesis-in-bovine-ovaries
#11
App Teh, U Z Izzati, K Mori, N Fuke, T Hirai, G Kitahara, R Yamaguchi
Bovine granulosa cells (GC) vary in their morphological aspect during different stages of folliculogenesis. In this study, 10 morphologically normal bovine ovaries were collected to study the structural aspects of different stages of GC using intermediate filament protein antibodies including cytokeratin AE1/AE3 (AE1/AE3), vimentin, nectin-4 and desmin. Hormonal immunolocalization was assessed using the immunomarkers anti-Müllerian hormone (AMH) and inhibin alpha. In addition, tumour markers and proliferation markers using c-erbB-2 oncoprotein and proliferating cell nuclear antigen, respectively, were investigated...
February 15, 2018: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29447380/sirtuins-in-gamete-biology-and-reproductive-physiology-emerging-roles-and-therapeutic-potential-in-female-and-male-infertility
#12
Carla Tatone, Giovanna Di Emidio, Arcangelo Barbonetti, Gaspare Carta, Alberto M Luciano, Stefano Falone, Fernanda Amicarelli
BACKGROUND: Sirtuins (SIRT1-7) are a family of NAD+-dependent deacetylases that catalyze post-translational modifications of proteins. Together, they respond to metabolic challenges, inflammatory signals or hypoxic/oxidative stress, and are associated with aging and longevity. The role of Sirtuins in the regulation of fertility emerged in 2003 when a defective reproductive phenotype was observed in SIRT1-null mice. Although studies on Sirtuins in reproductive biology have been increasing in the last years, a recent comprehensive update on this issue is still lacking...
February 13, 2018: Human Reproduction Update
https://www.readbyqxmd.com/read/29444704/hpmsc-transplantation-restoring-ovarian-function-in-premature-ovarian-failure-mice-is-associated-with-change-of-th17-tc17-and-th17-treg-cell-ratios-through-the-pi3k-akt-signal-pathway
#13
Na Yin, Yanlin Wang, Xueyan Lu, Ranran Liu, Lianshuang Zhang, Wei Zhao, Wendan Yuan, Qianqian Luo, Hao Wu, Xiying Luan, Hongqin Zhang
BACKGROUND: Human placenta-derived mesenchymal stem cell (hPMSC) transplantation has been demonstrated to be an effective way of recovering ovarian function in mice with autoimmune induced premature ovarian failure (POF). But the exact mechanism remains unclear. The goal of the present study is to investigate the role of immune factors (T-helper 17 (Th17), cytotoxic T (Tc17) and regulatory T (Treg) cells) in the recovery of ovarian function and whether the phosphatidylinositol 3-kinase (PI3K)/Akt signal pathway is involved in the regulation...
February 14, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29438675/involvement-of-matrix-metalloproteinases-mmp-2-7-9-and-their-tissue-inhibitors-timp-2-3-in-the-regression-of-chicken-postovulatory-follicles
#14
Anna Hrabia, Joanna K Socha, Andrzej Sechman
The study was undertaken to examine mRNA expression and localization of selected matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs), and the activity of MMPs in chicken postovulatory follicles (POFs) during their apoptotic regression. Apoptotic cells and apoptosis-related caspase expression and activity were examined as well. Chickens were sacrificed 2 h and 21 h after ovulation, and five POFs (POF1 to POF5) were isolated from the ovaries. It was found that the number of apoptotic cells (TUNEL-positive) increased along with follicle regression...
February 10, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29438534/both-in-vivo-fsh-depletion-and-follicular-exposure-to-gonadotrophin-releasing-hormone-analogues-in-vitro-are-not-effective-to-prevent-follicular-depletion-during-chemotherapy-in-mice
#15
F Horicks, G Van Den Steen, C Gervy, H J Clarke, I Demeestere
STUDY QUESTION: Does fertility preservation using gonadotrophin-releasing hormone (GnRH) analogues during chemotherapy act through a direct effect on the ovary or through inhibition of FSH secretion? SUMMARY ANSWER: The absence of FSH in vivo and the direct exposition of ovarian follicles to GnRH analogues in vitro did not prevent chemotherapy-induced ovarian damage. WHAT IS KNOWN ALREADY: The potential mechanisms of action of GnRH analogues in protecting ovaries against chemotherapy damage remain poorly understood...
February 9, 2018: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29438034/c1qtnf3-in-the-murine-ovary-and-its-function-in-folliculogenesis
#16
Zhoufei Mao, Liuhong Yang, Xiaosheng Lu, Anni Tan, Yuxia Wang, Fei Ding, Luanjuan Xiao, Xufeng Qi, Yanhong Yu
C1q/tumor necrosis factor-related protein 3 (C1QTNF3) is a novel adipokine with modulating effects on metabolism, inflammation, and the cardiovascular system. C1QTNF3 expression levels in the sera and omental adipose tissues of women with PCOS are low compared to control subjects. However, the expression and function of C1QTNF3 in the ovary has not previously been examined. Here, we assessed the expression patterns of C1qtnf3 in the ovary and explored its role in folliculogenesis. The C1qtnf3 transcript abundance was higher in large follicles than in small follicles and was under the influence of gonadotropin...
February 1, 2018: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29436204/improvement-in-ovarian-tissue-quality-with-supplementation-of-antifreeze-protein-during-warming-of-vitrified-mouse-ovarian-tissue
#17
Hyun Sun Kong, Eun Jung Kim, Hye Won Youm, Seul Ki Kim, Jung Ryeol Lee, Chang Suk Suh, Seok Hyun Kim
Ice easily recrystallizes during warming after vitrification, and antifreeze protein (AFP) can inhibit the re-crystallization. However, no study has evaluated the effect of AFP treatment only thereon during warming. This study sought to compare AFP treatment protocols: a conventional protocol with AFP treatment during vitrification and first-step warming and a new protocol with AFP treatment during the first-step warming only. According to the protocols, 10 mg/mL of LeIBP (a type of AFP) was used. Five-week-old B6D2F1 mouse ovaries were randomly divided into a vitrified-warmed control and two experimental groups, one treated with the conventional AFP treatment protocol (LeIBP-all) and the other with the new AFP treatment protocol (LeIBP-w)...
March 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29435117/replication-of-hepatitis-e-virus-in-the-ovary-and-promotion-of-oocyte-apoptosis-in-rabbits-infected-with-hev-4
#18
Junqing An, Tianlong Liu, Ruiping She, Qiaoxing Wu, Jijing Tian, Ruihan Shi, Wenzhuo Hao, Xinxin Ren, Yue Yang, Yiyao Lu, Yifei Yang, Yuanheng Wu
Hepatitis E virus (HEV) infection can induce infertility and miscarriage in pregnant women and infect neonates through vertical transmission. However, the mechanism of infertility and vertical transmission remains unclear. In the present study, we evaluated the replication of HEV in the ovary and structural and molecular changes induced by HEV after intraperitoneal injection of HEV in rabbits. Positive- and negative-strand HEV RNA was detected in the ovaries at 28 and 49 days post-infection. Positive HEV open reading frames 2 and 3 signals were observed in the ovaries by immunohistochemistry staining...
January 12, 2018: Oncotarget
https://www.readbyqxmd.com/read/29434814/metformin-and-pioglitazone-combination-therapy-ameliorate-polycystic-ovary-syndrome-through-ampk-pi3k-jnk-pathway
#19
Yuanyuan Wu, Pengfen Li, Dan Zhang, Yingpu Sun
Polycystic ovary syndrome (PCOS) is a common gynecological endocrine disorder, which results in health problems such as menstrual disorders, hyperandrogenism and persistent anovulation. Hyperandrogenism and insulin resistance are the basic characteristics of PCOS. To investigate the combined effect of metformin and pioglitazone on POCS and the potential mechanisms, a rat model of PCOS was established by intramuscular injection of estradiol valerate (EV). The effect of metformin and pioglitazone monotherapy or combination therapy in control rats and PCOS rats was evaluated, involving the testosterone level, follicular development and insulin resistance...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29430152/ovulation-induction-using-clomiphene-citrate-using-stair-step-regimen-versus-traditional-regimen-in-polycystic-ovary-syndrome-women-a-randomized-control-trial
#20
K Agrawal, Shalini Gainder, Lakhbir K Dhaliwal, Vanita Suri
Objective: To determine the efficacy of the stair-step protocol (SSP) using clomiphene citrate (CC) in patients with polycystic ovary syndrome (PCOS) and compare it with traditional regimen. Design: This was randomized control trial. Setting: Infertility Clinic. Patients: Sixty infertile PCOS women. Interventions: Patients were randomized into the study (SSP - 30 patients) and control group (traditional protocol - 30 patients)...
October 2017: Journal of Human Reproductive Sciences
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