共查询到17条相似文献，搜索用时 333 毫秒
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为了研究胶质细胞原性神经营养因子(GDNF)对体外培养小鼠精原干细胞增殖与分化的影响,试验采用差速贴壁法分离小鼠精原干细胞(SSCs)和支持细胞(sertoli),以sertoli为饲养层接种精原干细胞,用免疫荧光染色法对精原干细胞进行鉴定,并将精原干细胞分为2组,试验组培养基中加入GDNF,对照组不加,测定精原干细胞的生长增殖情况,检测精原干细胞生长周期。结果表明:共培养6,9,12,15天时,试验组精原干细胞吸光度值明显高于对照组(P<0.05或0.01)。随着共培养时间的延长,试验组精原干细胞S期染色质含量逐渐增多,然后又逐渐下降,开始另一个分裂周期;与试验组比较,对照组精原干细胞S期染色质含量增长缓慢(P<0.05)。说明GDNF能促进体外分离培养的小鼠精原干细胞的更新增殖。 相似文献
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精原干细胞移植原理与其它细胞移植原理相似,主要利用显微注射法,将供体的精原千细胞移入受体睾丸内,使其能够继续进行生精过程。结合精原干细胞分离培养、纯化、冷冻,该技术开创了基因工程和家畜生产的新途径。本文对精原干细胞的分离培养、纯化、冷冻,以及同源移植和异源移植进行了简要综述。 相似文献
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小鼠精原干细胞的形态结构及其细胞化学和免疫组化特性 总被引：18，自引：1，他引：17
应用光镜、电镜观察了 ７～８ ｄ 小鼠精原干细胞的形态结构特点;应用细胞化学、免疫组织化学方法研究了体外培养小鼠精原干细胞的细胞化学和免疫组织化学特性。结果显示,精原干细胞呈圆形,直径（９±１） μｍ ,核大,呈圆形或轻微卵圆形,胞质较少;核内常染色质占绝对优势,异染色质极少;胞质内核糖体、线粒体较丰富,其他细胞器不发达;精原干细胞 Ａ Ｋ Ｐ染色呈阳性或强阳性,胞质内脂滴很少或没有;精原干细胞表达特异的 ｃｋｉｔ 受体;体外培养的小鼠精原干细胞常呈不完全的胞质分裂,细胞间由细胞间桥相连而呈链状或团状的细胞群丛,细胞群常由偶数细胞组成。 相似文献
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精原干细胞是体内唯一的能在细胞水平进行识别并增殖、分化及调控的成体干细胞,是位于精曲小管基膜上,既能自我更新,维持自身群体数量恒定,又能定向分化产生精母细胞的一类原始精原细胞,其前体是原始生殖细胞(primord ial germ cells,PGCs)。近年来,随着精原干细胞鉴定,体外培养及冻存等技术的发展,精原干细胞的应用成为可能。文章对精原干细胞形态特征、分离纯化、体外培养及影响因素等进行综述。1精原干细胞的形态、特性及其增殖分化精原干细胞相对数量极少,仅占生殖细胞的0.02%~0.03%。睾丸中大部分的精原细胞并非干细胞,而是处于分化… 相似文献
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精原干细胞移植技术是一种新兴的动物繁殖技术,可以提高雄性动物的生殖能力.该技术是从适龄雄性供体动物采集精原干细胞,注射入适龄受体动物的生精小管中使其产生精子的技术.精原干细胞移植首先在小鼠试验中获得成功,接着人们将这项技术应用到家畜等大中型动物中并获得成功.随着这项技术的不断深入研究,精原干细胞不但可以在同种间进行移植,而且在异种间的移植也获得成功.通过对培养体系的不断完善,筛选、移植方法的不断改进,可以获得更高的移植成功率.精原干细胞移植为提高优良品种家畜的生产效率、保护野生动物资源、转基因动物的生产及不育症的治疗提供了一种新的方法. 相似文献
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为研究促进精子发生的体外培养体系,通过无血清睾丸组织培养法,将成年牛睾丸组织块种植于培养板, 观测不同时间睾丸细胞的迁出和形态变化。通过油红O染色鉴定具有分泌功能的支持细胞,通过碱性磷酸酶和免疫组化染色鉴定集落样生长的精原干细胞。结果发现该体系可获得生长良好的多种类型细胞,包括表达AP、Oct-4和GFRα1的精原干细胞及具有分泌功能的睾丸支持细胞,并可获得大量精子。说明,该无血清培养体系可作为一个重要的工具来研究生物学和化学因素对雄性生殖系统的影响,也为研究精子体外发生和移植提供了材料。 相似文献
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Full-term development of offspring using round spermatids produced ectopically from fetal male germ cells 总被引：8，自引：0，他引：8
The continuous production of mammalian sperm is maintained by the proliferation and differentiation of spermatogonial stem cells, which originate from primordial germ cells in the early embryo. Previously, we reported that the transplantation of fetal male gonadal tissue into the recipient testis was effective obtaining functional sperm. This transplantation technique is a promising new approach for the preservation of testicular function in a mutant animal with embryonic lethality. In the present study, we examined whether spermatogenesis from fetal male germ cells is induced under ectopic conditions in male and female recipients. Nine to 10 weeks after the transplantation of male gonads prepared from embryos at 12.5 or 16.5 days post gestation, male germ cell differentiation occurred under the skin of male and female recipient nude mice. Histological analyses revealed that grafted gonads contained haploid germ cells such as round or elongated spermatids. Furthermore, we succeeded in obtaining normal progeny by injecting the ectopically produced round spermatids into the cytoplasm of oocytes, even when the male germ cells had been generated in female recipients. These results indicate that the transplantation of fetal male gonads under the skin of recipient mice is a useful technique for obtaining functional male gametes. 相似文献
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Okutsu T Yano A Nagasawa K Shikina S Kobayashi T Takeuchi Y Yoshizaki G 《The Journal of reproduction and development》2006,52(6):685-693
Germ-cell transplantation has many applications in biology and animal husbandry, including investigating the complex processes of germ-cell development and differentiation, producing transgenic animals by genetically modifying germline cells, and creating broodstock systems in which a target species can be produced from a surrogate parent. The germ-cell transplantation technique was initially established in chickens using primordial germ cells (PGCs), and was subsequently extended to mice using spermatogonial stem cells. Recently, we developed the first germ-cell transplantation system in lower vertebrates using fish PGCs and spermatogonia. During mammalian germ-cell transplantation, donor spermatogonial stem cells are introduced into the seminiferous tubules of the recipient testes. By contrast, in the fish germ-cell transplantation system, donor cells are microinjected into the peritoneal cavities of newly hatched embryos; this allows the donor germ cells to migrate towards, and subsequently colonize, the recipient genital ridges. The recipient embryos have immature immune systems, so the donor germ cells can survive and even differentiate into mature gametes in their allogeneic gonads, ultimately leading to the production of normal offspring. In addition, implanted spermatogonia can successfully differentiate into sperm and eggs, respectively, in male and female recipients. The results of transplantation studies in fish are improving our understanding of the development of germ-cell systems during vertebrate evolution. 相似文献