Corpus ID: 25576381

Spermatogenesis-preventing substance in Japanese eel.

@article{Miura2002SpermatogenesispreventingSI,
  title={Spermatogenesis-preventing substance in Japanese eel.},
  author={Takeshi Miura and Chiemi Miura and Yasuko Konda and Kohei Yamauchi},
  journal={Development},
  year={2002},
  volume={129 11},
  pages={
          2689-97
        }
}
Under fresh-water cultivation conditions, spermatogenesis in the Japanese eel is arrested at an immature stage before initiation of spermatogonial proliferation. A single injection of human chorionic gonadotropin can, however, induce complete spermatogenesis, which suggests that spermatogenesis-preventing substances may be present in eel testis. To determine whether such substances exist, we have applied a subtractive hybridisation method to identify genes whose expression is suppressed after… Expand
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References

SHOWING 1-10 OF 53 REFERENCES
Hormonal induction of all stages of spermatogenesis in vitro in the male Japanese eel (Anguilla japonica).
TLDR
Results suggest the following sequence for the hormonal induction of spermatogenesis in eel testes; gonadotropin stimulates the Leydig cells to produce 11-ketotestosterone, which activates the Sertoli cells leading to the completion of sPermatogenesis. Expand
Human chorionic gonadotropin induces all stages of spermatogenesis in vitro in the male Japanese eel (Anguilla japonica).
TLDR
Evidence is obtained that human chorionic gonadotropin can induce the entire process of spermatogenesis, in vitro, from sperMatogonia to spermatozoa within 24 days and that this effect of gonadotropic substance is mediated through the actions of testicular somatic cells. Expand
Two testicular cDNA clones suppressed by gonadotropin stimulation exhibit ZP2‐ and ZP3‐like structures in Japanese eel
TLDR
It is speculated that eSRS3 and eS RS4 may play important roles in the prevention of spermatogenesis in the eel, as both have amino acid sequences similar to those of the ZP‐domains of zona pellucida sperm‐binding protein (ZP‐2 and 3, respectively. Expand
Hormonal induction of all stages of spermatogenesis in germ‐somatic cell coculture from immature Japanese eel testis
TLDR
Results demonstrate that physical contact of germ cells to Sertoli cells is required for inducing spermatogenesis in response to 11‐KT, and establish a new culture system in which germ cells and somatic cells are cocultured after they are aggregated into pellets by centrifugation. Expand
Artificial Maturation of Cultivated Male Japanese Eels by Synahorin Injection
TLDR
Premature maturation was brought about in cultivated male Japanese eels by the injection of synahorin and the spermatogenesis of the fish was then studied cytologically and it resembles that of Anguilla vulgaris. Expand
Differentiation of spermatogenic cells from vertebrates in vitro.
  • S. Abe
  • Biology, Medicine
  • International review of cytology
  • 1987
Publisher Summary This chapter discusses the survey of studies on the culture of spermatogenic cells from vertebrates, especially from mammals and amphibians. The process of spermatogenesis can beExpand
KINETICS OF SPERMATOGENESIS IN MAMMALS
  • E. Roosen-Runge
  • Biology, Medicine
  • Annals of the New York Academy of Sciences
  • 1952
TLDR
This aspect of spermatogenesis is the subject of the present paper and is being treated under the heading of “kinetics” of sPermatogenesis. Expand
Regulation of the onset of meiosis in the developing testis.
TLDR
The findings indicate that MAS activity is associated with the onset of spermatogenesis and is also present shortly after birth, and activity of MPS is present throughout much of the prespermatogenic period, with a decline to reach low levels at the onset. Expand
Abnormal sexual development in transgenic mice chronically expressing Müllerian inhibiting substance
TLDR
The results suggest that MIS has several distinct roles in mammalian sexual development, including feminization of the external genitalia, impairment of Wolffian duct development, and undescended testes in transgenic males. Expand
Purified bovine AMH induces a characteristic freemartin effect in fetal rat prospective ovaries exposed to it in vitro.
TLDR
Data suggest that AMH is the testicular factor responsible for triggering the morphological abnormalities of freemartin gonads, and consistently induced a characteristic 'freemartsin effect' in the gonadal blastema. Expand
...
1
2
3
4
5
...