Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

Oordt, P. G. W. J. van; Peute, J.; Hurk, R. van den; Viveen, Willem

doi:10.1016/0044-8486(87)90059-7

Cited by 35 publications

(15 citation statements)

References 22 publications

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“…spermatozoa present in many tubuli). Fish raised in captivity do not differ in testis size or histology from wild fish collected from spawning grounds (Van Oordt et al 1987, Schulz et al 1994. However, the captive fish are in a pre-spawning condition; in natural habitats, the full spawning condition is triggered by environmental stimuli (i.e.…”

Section: Animalsmentioning

confidence: 99%

Cloning and functional characterization of a testicular TSH receptor cDNA from the African catfish (Clarias gariepinus)

Vischer

Bogerd

2003

Journal of Molecular Endocrinology

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A cDNA encoding a putative thyroid-stimulating hormone receptor (cfTSH-R) was cloned from the testis of the African catfish (Clarias gariepinus). The cfTSH-R showed the highest amino acid sequence identity with the TSH-Rs of other fish species. In addition, an insertion of approximately 50 amino acids, specific for the TSH-R subfamily, was also present in the carboxy terminus of the amino-terminal extracellular domain of the cfTSH-R. Next to the testis and thyroid follicles, abundant cfTSH-R expression was detected in cerebellum, brain, ovary, seminal vesicles and pituitary, while weaker expression was found in muscle, stomach, intestine, head-kidney, liver, kidney and heart. HEK-T 293 cells, transiently expressing the cfTSH-R, significantly increased intracellular cAMP levels in response to human TSH. Catfish LH, human choriogonadotropin and human FSH were also able to induce this cfTSH-R-mediated response, although with considerably lower efficiency than human TSH. These results indicated that a functional cfTSH-R had been cloned from the testis of African catfish.

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Section: Animalsmentioning

confidence: 99%

Cloning and functional characterization of a testicular TSH receptor cDNA from the African catfish (Clarias gariepinus)

Vischer

Bogerd

2003

Journal of Molecular Endocrinology

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“…Looking for the nature of the male pheromones, it is necessary to know the steroidogenic capacity of the testes and the seminal vesicle of feral fish during gonadal recrudescence and the ensuing breeding period Van Oordt et al, 1987). Enzyme-histochemical studies by Resink et al (1987b) demonstrated that both in testis and seminal vesicle, steroids are produced by interstitial cells.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the results of previous experiments by Schoonen and Lambert (1986a,b) and Schoonen et al (1987a,b,c ) Van Oordt et al, 1987). Histological examination of reproductive organs and measurement of the plasma gonadotropin concentration were carried out to interpret the biochemical data.…”

Section: Introductionmentioning

confidence: 99%

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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“…Similarly, two peaks of pituitary GTH-II content were reported in female H. fossilis, the minor peak in early prespawning (May) and the major peak in early spawning phase (July) (Senthilkumaran, 1995). In the African catfish, the peak GTH content was observed in the beginning of breeding period (May) in males and two months later (July) in females (Van Oordt et al, 1987). Apparently, the variations in the annual cycles of hormone contents of the pituitary-reproductive axis are subjected to changes in external (photope-riod and temperature) and steroid feedback influences, sex differences etc.).…”

Section: Discussionmentioning

confidence: 99%

Pituitary-gonadal Relationship in the Catfish Clarias batrachus (L): A Study Correlating Gonadotrophin-II and Sex Steroid Dynamics

et al. 2000

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Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

Cited by 35 publications

References 22 publications

Cloning and functional characterization of a testicular TSH receptor cDNA from the African catfish (Clarias gariepinus)

Cloning and functional characterization of a testicular TSH receptor cDNA from the African catfish (Clarias gariepinus)

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

Pituitary-gonadal Relationship in the Catfish Clarias batrachus (L): A Study Correlating Gonadotrophin-II and Sex Steroid Dynamics

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