نتایج جستجو برای: primordial follicles

تعداد نتایج: 22985  

Journal: :iranian journal of applied animal science 2015
f. esmaielzadeh s.m. hosseini m. hajian z. nasiri m. chamani

the aim of the present study was to investigate the effect of follicle stimulating hormone (fsh) on survival, activation and growth of ovine primordial follicles using histological studies. pieces of ovine ovarian cortex were obtained and cultured for 6 days in minimum essential medium supplemented with or without fsh (50 ng/ml). these fragments were then process to be used for histology compar...

Asmatullsh, A Mubarak Khalid , K Raees Ahmad , N Tawakal , U Farooq Khan ,

Introduction:Artifical sourace of radiation have increased worldwide average annual exposure of mankind and could especially affect rapidly dividing cells in gonads. Since, radiation sensitivities of different components of primordial follicles, and the time required for their deplation have not been morphologically eatablished we decided to estimate the time required for depletion of primordi...

Journal: :iranian journal of toxicology 0
n tawakal department of anatomy, king edward medical university, lahore pakistan a mubarak khalid department of anatomy, king edward medical university, lahore pakistan u farooq khan lahore general hospital, lahor pakistan k raees ahmad department of biological sciences, university of sargodha, sargodha, pakistan asmatullsh department zoology, university of the punjab, lahor, pakistan

introduction:artifical sourace of radiation have increased worldwide average annual exposure of mankind and could especially affect rapidly dividing cells in gonads. since, radiation sensitivities of different components of primordial follicles, and the time required for their deplation have not been morphologically eatablished we decided to estimate the time required for depletion of primordia...

2014
Wenjing Zheng Hua Zhang Nagaraju Gorre Sanjiv Risal Yan Shen Kui Liu

In the mammalian ovary, progressive activation of primordial follicles serves as the source of fertilizable ova, and disorders in the development of primordial follicles lead to various ovarian diseases. However, very little is known about the developmental dynamics of primordial follicles under physiological conditions, and the fates of distinct populations of primordial follicles also remain ...

Background: Nandrolone decanoate (ND) is an anabolic androgenic steroid (AAS) which influences the ovarian structure and function. We assessed the effects of ND on the ovarian volume, number of primordial follicles, and level of hormones and also evaluated the modulatory effects of gonadotropins on the histopathological changes imposed by the administration of ND. Methods: Six groups of Sprague...

Journal: :modares journal of medical sciences: pathobiology 2013
rouhollah fathi mojtaba rezazadeh mojdeh salehnia

objective: the aim of this study was to evaluate the effect of sucrose on follicular survival rate and the incidence of apoptosis in rat ovarian tissue following vitrification. methods: ovaries of approximately 5-week-old female wistar rats were divided randomly into three groups: control (non-vitrified), vi (ethylene glycol + dimethyl sulfoxide) and vii (eg + dmso + 0.25 mol/lit sucrose). vit...

Journal: :Human reproduction 2002
R A Cushman C M Wahl J E Fortune

BACKGROUND Little is known about the factors that control the initiation of growth of primordial follicles. Primordial follicles in pieces of fetal bovine ovarian cortex spontaneously activate in vitro and develop to the primary stage, but few follicles develop further. For decades, embryologists have grafted tissue to the chorioallantoic membrane (CAM) of chick embryos to study the development...

Journal: :modares journal of medical sciences: pathobiology 2013
mojde pajokh mojdeh salehnia

objective: growth differentiation factor 9b (gdf9b) is an oocyte-derived growth factor. this protein is essential for the development of ovarian follicles and acts mainly by binding to its receptor on the surface of granulosa cells. the effect of gdf9b on the growth of follicles in various developmental stages, particularly primordial and primary follicles, is unknown. thus the aim of this stud...

Journal: :Human reproduction 2012
J E Hornick F E Duncan L D Shea T K Woodruff

BACKGROUND In vitro follicle growth is a promising fertility preservation strategy in which ovarian follicles are cultured to produce mature and fertilization-competent oocytes. However, in primates, there has been limited success with in vitro follicle growth starting from primordial and primary follicles because adequate isolation methods and culture strategies have not been established. Unde...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
P Da Silva-Buttkus G Marcelli S Franks J Stark K Hardy

Female mammals are born with a lifetime's supply of oocytes individually enveloped in flattened epithelial cells to form primordial follicles. It is not clear how sufficient primordial follicles are maintained to sustain the reproductive lifespan, while providing an adequate supply of mature oocytes for ovulation. Locally produced growth factors are thought to be critical regulators of early fo...

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