Germ cell markers were analyzed for c-Kit, GDF-9 and VASA transcript markers

Germ cell markers were analyzed for c-Kit, GDF-9 and VASA transcript markers. germ cell markers Retinyl acetate (c-Kit, GDF-9, and VASA) were evaluated by RT-PCR. VASA and GDF-9 were immune-localized in oocyte-like structures. == Results == Expressions of germ cell markers in the intact ovary were significantly decreased in aged females, whereas expressions of pluripotent markers were not detected, regardless of age. Scraped OSE expression of all pluripotent and germ cell markers, except for c-Kit, was comparable between both age groups. Three weeks postcultured OSE experienced significantly decreased expression of GDF-9 and VASA , but not c-Kit, in aged mice, as compared to young mice; however there was no difference in the expression of other genes. The number of positively stained Oct-4 by immunohistochemistry in postcultured OSE was 2.5 times higher in young mice than aged mice. Oocyte-like structure was spontaneously Retinyl acetate produced in postcultured OSE. However, while that of young mice revealed a prominent nucleus, zona pellucida-like structure and cytoplasmic organelles, these features were not observed in aged mice. == Conclusions == These results show that aged female mice have putative OSCs in OSE, but their differentiation potential, as well as the number of OSCs differs from those of young mice. Keywords:Putative ovarian stem cells (OSCs), Ovarian surface epithelium (OSE), Pluripotent and germ cell markers, Female age == Background == Advancing female age is closely associated with a decrease in the number and quality of ovulated oocytes. Numerous methods including the activation of ovarian angiogenesis have been attempted to improve oocyte quality in the aged female [14]. However, it remains a challenging problem in the treatment of infertility. Since Tillys group first reported the presence of proliferative germline stem Retinyl acetate cells that sustain oocyte Rabbit Polyclonal to MRPS31 and follicle production in the postnatal mouse ovary [5], many studies have subsequently exhibited that putative ovarian stem cells (OSCs) can be successfully isolated from your ovarian surface epithelium (OSE) of the neonatal and adult mammalian ovary, including mice and human [68]. This concept has challenged the traditional central dogma of mammalian reproductive biology that female are born with a finite and non-renewable pool of oocyte-containing follicles [9]. Nevertheless, these findings suggested that postnatal oocyte renewal using OSE-derived OSCs will be helpful to better management and understanding of menopause, reproductive disease, and infertility associated with old age, poor response, or premenopause ovarian failure (POF). OSEs are epithelial cells covering the ovaries and they are relatively less differentiated, uncommitted layer of cells that express both epithelial and mesenchymal markers [10,11]. Recently, Parteet al. launched a new concept that OSE-derived OSCs possess of Retinyl acetate 2 unique stem cell populations including the pluripotent very small embryonic like stem cells (VSELs) and their immediate descendent progenitor ovarian germ stem cells (OGSCs) in most adult mammals, including mice, rabbits, sheep, monkeys, and women [11,12]. Several recent studies have shown successful postnatal oocyte renewal from OSCs derived from the OSE. Zouet al.reported the production of offspring after transplantation of a germline stem cell line derived from the neonatal mouse ovary into ovaries of infertile mice [13]. Niikuraet al. showed that aged mouse ovaries possess a rare populace of premeiotic germ cells that retain the capacity to form oocytes on exposure to a young host environment [14]. Whiteet al. reported that ovaries from women of reproductive-age also possess rare mitotically active germ cells that can be propagatedin vitro, as well as generate oocytesin vitroandin vivo[15]. These results suggested that OSE-derived OSCs can produce primordial germ cells and oocytes if appropriate conditions are provided. Therefore, if OSCs existing in the aged ovary could constantly generate good quality oocytes, it may provide a basis of effective.