Effects of salmon pituitary gonadotropin, ovine luteinizing hormone, and testosterone on the testes and seminal vesicles of hypophysectomized catfish, Heteropneustes fossilis (Bloch)

Sundararaj, Bangalore I.; Nayyar, S. K.; Anand, T.C.; Donaldson, Edward M.

doi:10.1016/0016-6480(71)90155-9

Cited by 36 publications

(13 citation statements)

References 11 publications

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“…This was probably due to a release of fluid from the seminal vesicle tubules, since their size was reduced in the distal area of the lobes. Sundararaj et al (1971) observed an extrusion of seminal vesicle secretion during spermiation in the Indian catfish, Heteropneustes fossilis, after injection with salmon gonadotropin. In African catfish the release of seminal fluid may also be controlled by GTH.…”

Section: Discussionmentioning

confidence: 98%

Quantitative enzyme histochemistry of steroid and glucuronide synthesis in testes and seminal vesicle, and its correlation to plasma gonadotropin level in Clarias gariepinus

et al. 1987

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In spawning C2aria.s gariepin~ from the Hula Nature Reserve in Northern Israel, the mean value for the seminal vesicle somatic index (SVSI) had decreased as compared with that in prespawning fish, due to loss of seminal vesicle fluid. Mean gonadosomatic index (GSI) , however, had increased, probably as a result of hydration, Sa-Hydroxysteroid dehydrogenase (3cuHSD) , 3BHSD and uridine diphosphoglucose dehydrogenase (UDPGD ) reactions were demonstrated in inter&it&I cells of both testis and seminal vesicle. UDPGD reactions were also found in the epitheiium of the seminal vesicle tubules. Q~ti~tive determination of the enxyme reactions with a computerised image analysis system revealed that total activity of all three enzymes in interstitial cells of the seminal vesicle was distinctly stronger in spawning fish. ~~awn~g~d spawning fish did not differ in totai UDPGD activity in the epitheli~ Iining the seminal vesicle tubules. Xn the tastes of spawning fii, t&al 3flHSD activity was stronger and total UDPGD activity weaker than in prespawning fish, but total 3cuHSD activity was not different. Plasma gonadotropm ( GTH ) levels in male catfish were low as compared with females. This level was s~~~~y increased in spawning males and extremely high in ovulated female spawning fish. The findings point to marked changes in the production of steroids and glucuronidea in the reproductive organ system during spawning, especially in the seminal vesicle. Thw changes are accompanied by elevated levels of circulating GTH.

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Section: Discussionmentioning

confidence: 98%

Quantitative enzyme histochemistry of steroid and glucuronide synthesis in testes and seminal vesicle, and its correlation to plasma gonadotropin level in Clarias gariepinus

et al. 1987

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“…Apparently, this limited rise in GTH output was sufficient for the growth of testes and seminal vesicles. Regulation of these processes by gonadotropin has been demonstrated for Heteropneustes fossilis (Sundararaj and Nayyar, 1967;Sundararaj et al, 1971;Nayyar et al, 1976). In this catfish species, hypophysectomy resulted in regression of testes and seminal vesicles; replacement therapy with gonadotropins appeared to restore their functional activity.…”

Section: Discussionmentioning

confidence: 98%

Seasonal changes in steroid metabolism in the male reproductive organ-system of the African catfish, Clarias gariepinus

et al. 1987

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In testes, the capacity to form progestins, androgens, especially ll-oxygenated ones, and steroid glucuronides increased enormously in the periods of full spermatogenesis and breediig, with 5#?-pregnane-3a,17a,20a-triol and 5fi-pregnane-3a,17t-diol-20-one glucuronide as the main polar products. In the same periods, seminal vesicles are able to form ll-oxygenated androgens from[ 3H] -androstenedione and show an increased capacity to form testosterone. Their ability to produce testosterone glucuronide is strongly enhanced in the period of full spermatogenesis and further increases in the breeding period. In this latter period, the capacity to form 5/$androstane3a,l7cr-diol glucuronide is also stimulated. The function of the main steroids and steroid glucuronides is discussed, with special reference to the water-soluble compounds that may serve as sex pheromones.

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“…In vivo investigations and in vitro studies using tissue culture systems have pointed out that mammalian (growth hormone, GH; human chorionic gonadotropin) or fish (gonadotropin II, GtH II> pituitary hormones, as well as androgens (testosterone) are able to induce spermatogoni~ m~tiplication in either intact (Khan et al, 1987) or h~physectomized ~Sundararaj et al, 1971;Pickford et al, 1972;Khan et al, 1987) or juvenile fish (Upadhyay, 1977;Magri et al, 1985), or in testicular fragments (Remacle, 1976;Cochran, 1992). In addition, it has been proposed that transformation of trout spermatogonia to spermat~es is regulated through GtH control (Ruby et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

In vitro approach to the control of spermatogonia proliferation in the trout

Loir

1994

Molecular and Cellular Endocrinology

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When spermatogonia and primary spermatocytes (Go + CD, uncontaminated by somatic testicular cells, were prepared from trout testes at various maturation stages and cultured alone, basal tritiated thymidine (3H-Tdr) incorporation decreased throughout the reproductive cycle. It was unchanged by salmon gonadotropin (sGtH II), trout growth hormone (rhGH), testosterone, estradiol and 17cz,20&dihydroprogesterone. Conversely, it was dose-dependently stimulated by rhIGF-I, with a mean ED,, of 5.2 ng/ml and a mean maximum stimulation of 3.2-fold above control. When Go + CI were cultured either in the presence of Sertoli cells or in Sertoli cell-conditioned medium (SCCM), basal 3H-Tdr incorporation was always decreased when the Sertoli cells were from spermatogenetic testes, but it was stimulated when they were from testes which were to resume spermatogenesis soon. Whatever the origin of the Sertoli cells, they always partly inhibited IGF-I stimulation. When present during either the cc-cultures or the preparation of SCCM, sGtH II and rtGH had no effect when Sertoli cells were from spermatogenetic testes. In conclusion, IGF-I is a direct efficient stimulator of the proliferation of trout male germ cells, the effect of which is partly counteracted by Sertoli cells. sGtH II, rtGH and the 3 tested steroids are not directly active. While sGtH II has no Sertoli cell-mediated activity, further investigation is necessary to clarify whether the other tested molecules have such an activity.

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Effects of salmon pituitary gonadotropin, ovine luteinizing hormone, and testosterone on the testes and seminal vesicles of hypophysectomized catfish, Heteropneustes fossilis (Bloch)

Cited by 36 publications

References 11 publications

Quantitative enzyme histochemistry of steroid and glucuronide synthesis in testes and seminal vesicle, and its correlation to plasma gonadotropin level in Clarias gariepinus

Quantitative enzyme histochemistry of steroid and glucuronide synthesis in testes and seminal vesicle, and its correlation to plasma gonadotropin level in Clarias gariepinus

Seasonal changes in steroid metabolism in the male reproductive organ-system of the African catfish, Clarias gariepinus

In vitro approach to the control of spermatogonia proliferation in the trout

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