K. Yamauchi

Publications250
h-index47
Citations6,900
Highly Influential Citations338
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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
Histological and ultrastructural evidence for the role of gonadal steroid hormones in sex change in the protogynous wrasse Thalassoma duperrey
TLDR
The process of sex change from ovary to testis was divided into six stages on the basis of changes in the structure of the germinal and somatic elements, and sex change to male was considered complete with the beginning of active spermatogenesis and spermiation. Expand
Japanese Eel Follicle-Stimulating Hormone (Fsh) and Luteinizing Hormone (Lh): Production of Biologically Active Recombinant Fsh and Lh by Drosophila S2 Cells and Their Differential Actions on the…
TLDR
The data strongly suggest that Fsh and Lh differentially play important roles in the reproductive physiology of the Japanese eel, which is probably due to the qualitative nature of glycosylation in S2 cells, which resulted in degradation of the recombinant protein in vivo. Expand
Identification of the salmon somatolactin receptor, a new member of the cytokine receptor family.
Somatolactin (SL) is a pituitary hormone of the GH/prolactin (PRL) family that so far has been found only in fish. Compared with GH and PRL, the primary structure of SL is highly conserved among… Expand
Spermatogenesis-preventing substance in Japanese eel.
TLDR
It is concluded that eSRS21 prevents the initiation of spermatogenesis and, therefore, suppression of eS RS21 expression is necessary to initiate sperMatogenesis. Expand
Ovarian development and serum sex steroid and vitellogenin profiles in the female cultured sturgeon hybrid, the bester
TLDR
The results indicate that the time appropriate for induction of artificial reproduction would be from October–November to April–May when the oocytes are in the late Stages of the development. Expand
Estradiol-17beta stimulates the renewal of spermatogonial stem cells in males.
TLDR
In vitro, 10 pg/ml of E(2) was sufficient to induce spermatogonial stem cell division in cultured testicular tissue, therefore confirming the in vivo observations, and clearly show that estrogen is an indispensable "male hormone" in the early sperMatogenetic cycle. Expand
The role of hormones in the acquisition of sperm motility in salmonid fish.
TLDR
Gonadotropin-induced testicular production of 17 alpha, 20 beta-dihydroxy-4-pregnen-3-one, the oocyte maturation-inducing hormone of salmonid fish, is responsible for the acquisition of sperm motility but neither testosterone (T) nor 11-ketotestosterone (11-KT), the two major androgens in teleost fish, were effective. Expand
INVOLVEMENT OF STEROID HORMONES IN GONADOTROPIN-INDUCED TESTICULAR MATURATION IN MALE JAPANESE EEL (ANGUILLA JAPONICA)
Testicular development and serum sex steroid profiles during the annual sexual cycle of the male sturgeon hybrid, the bester
TLDR
It is suggested that the time appropriate for induction of final maturation would be from November–December to April when the testes are in the late stage of development. Expand
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