Background: The majority of thousands of oocytes in the ovaries are small, non-growing and reside in preantral follicles (PFs). The development of a culture system for preantral follicle may be very useful for understanding the complex mechanism in folliculogenesis at early stages of development as wells as could offer a significant way for the propagation of livestock, including goats. This pa...

BACKGROUND Silent information regulator 2 related enzyme 1 (SIRT1) is one of the key factors in the mechanism of calorie restriction (CR) extending lifespan of animals. The aim of the study is to investigate if CR prolongs ovarian lifespan in mice through activating SIRT1 signaling. METHODS In the present study, 21 female C57BL/6 mice were divided into three groups: the control (n = 7), CR (n...

BACKGROUND The aim of this study was to investigate follicular growth and steroid production in neonatal mouse ovary during in vitro culture. MATERIALS AND METHODS In this experimental study, 7-day-old mouse whole ovaries were cultured in α-MEM (medium supplemented with 100 mIU/ml recombinant follicle stimulating hormone, 1% insulin, transferrin and selenium (ITS), 5% fetal bovine serum (FBS)...

BACKGROUND Ovarian tissue cryopreservation by vitrification is an attractive technique for fertility preservation in women. However, this technique has not been optimized. The aim of this study was to evaluate the baboon as a model for the preclinical study of ovarian tissue cryopreservation by vitrification and thawing. METHODS Ovarian cortical tissues (1-mm cubes) were obtained surgically f...

To reduce chemotherapy induced gonadotoxicity, co-treatment with gonadotropin releasing hormone against analogue (GnRHa) was tested using rat model. Leuprorelin acetate (Leuplin) with or without cisplatin (CDDP) was given subcutaneously at a dose of 9.4 microg/ml to Wistar strain female rats. The total number of follicles was counted and the maturation of follicles was evaluated at the largest ...

We report on the use of AI techniques – including image analysis, feature recognition, machine learning and constraint satisfaction – applied to the problem of determining the population of primordial follicles in a human ovary. We highlight the importance of accurate population data for studies that aim to predict the age of menopause in healthy women, and for studies that quantify damage to o...

The ultrastructure of the follicular wall in primordial, previtellogenic and vitellogenic follicles of the sexually immature ostrich is described in the present study. The follicular wall consists of a zona radiata, granulosa cell layer, basal lamina and thecal layer. Cytoplasmic processes from the plasma membranes of the granulosa cell layer and the ovocyte form the zona radiata in previtellog...

High-producing dairy cows are subfertile; however, the mechanisms responsible for the decreased fertility are unknown. The aim of the present study was to test the hypothesis that culled dairy cows (4-8 years old) characterised by 'Lo' ovaries (i.e. those with <10 mid-antral follicles) are affected by premature ovarian senescence. Cows in which both ovaries were 'Lo' ovaries represented 5% of t...

OBJECTIVE To evaluate DNA fragmentation in the oocyte of primordial and primary follicles and morphology of these follicles after freezing and thawing of ovarian cortex in sheep using two freezing protocols. DESIGN Fragmentation of DNA was evaluated by the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) technique. SETTING Fertility clinic in a large univ...

Ovarian cancer is the most lethal gynecological malignancy. Current treatment modalities include a combination of surgery and chemotherapy, which often lead to loss of fertility in premenopausal women and a myriad of systemic side effects. To address these issues, we have designed poly(amidoamine) (PAMAM) dendrimers to selectively target the follicle stimulating hormone receptor (FSHR), which i...