Effects of carp gonadotropin on ovarian maintenance, maturation, and ovulation in hypophysectomized catfish, Heteropneustes fossilis (Bloch).

  title={Effects of carp gonadotropin on ovarian maintenance, maturation, and ovulation in hypophysectomized catfish, Heteropneustes fossilis (Bloch).},
  author={B. I. Sundararaj and S. Nayyar},
  journal={General and comparative endocrinology},
  volume={30 4},
Abstract The gonadotropic potency of purified carp gonadotropin (c-GTH) was tested by evaluating ovarian maintenance, maturation, and ovulation during the spawning season in the hypophysectomized gravid catfish, Heteropneustes fossilis . Daily treatment with c-GTH (0.5, 1.0, and 2.5 μg/fish or 10, 20, and 40 ng/g body weight) for 7 days significantly maintained the yolky oocytes in the gravid ovaries. c-GTH also evoked a dose-dependent maturation and ovulation response; catfish injected with 50… Expand
Synthesis of vitellogenin and its uptake by the ovary in the catfish, Heteropneustes fossilis (Bloch) in response to carp gonadotropin and its subunits.
Abstract The gonadotropic potency of purified carp gonadotropin (c-GTH) and its α- and β-subunits was tested by evaluating their actions on synthesis of vitellogenin and its uptake by the ovary inExpand
Ovarian and body responses of the african catfish (Clarias gariepinus) to human chorionic gonadotropin (Chorulon R) and carp pituitary suspension, used in a bioassay for estimating the gonadotropic activity of a crude carp powder preparation
Ovarian and body responses of the African catfish to human chorionic gonadotropin (hCG) and a carp pituitary suspension (cPS) were used in a bioassay for estimating the gonadotropic activity of a crude carp powder preparation. Expand
Isolation and properties of the pituitary gonadotropin from silver carp (Hypophthalmichthys molitrix).
The gonadotropin of silver carp (scGTH) was purified from the pituitary glands in a yield of 8.4 mg/g and significantly stimulated the steroidogenesis in carp testis and ovary in vitro and induced the ovulation in loaches. Expand
Gonadotropin stimulation of estrogen and yolk precursor synthesis in juvenile rainbow trout.
Radioimmunoassays show that the carbohydrate-rich gonadotropin stimulates vitellogenin synthesis but the carbohydrates-poor gonadotropic does not, and support a hypothesis of action by two Gonadotropins in regulation of teleost viteLLogenesis. Expand
Biological properties of Indian walking catfish (Clarias batrachus) (L.) gonadotropins in female reproduction
Findings revealed that both LH-like and FSH-like have overlapping physiological functions, but their responses differ depending on the physiological status of the catfish. Expand
Effect of carp gonadotropin (cGTH) and a fraction unabsorbed on concanavalin A-Sepharose obtained from cGTH on vitellogenesis in the hypophysectomized marine teleost Gobius niger.
Vitellogenin was found in all the blood samples of animals treated by the hormones (cGTH and fraction I-cGH) alone and the contamination of cGTH by a small amount of material unbound on concanavalin cannot be solely responsible for the vitellogenic activity of c GTH which consists of 95% glycoproteins. Expand
Hormonal Regulation of in vivo and in vitro oocyte maturation in the catfish, Heteropneustes fossils (Bloch).
In the catfish, gonadotropin seems to stimulate the interrenal to produce corticosteroids which in turn act on the oocytes to induce maturation, and the mechanism of steroid-induced maturation has been investigated. Expand
The evolution of gonadotropins: some molecular data concerning a non-mammalian pituitary gonadotropin, the hormone from a teleost fish (Cyprinus carpio L.).
The amino acid and sugar compositions as well as long N-terminal sequences and the C-terminal amino acids of the two subunits of carp gonadotropin, SU I and SU II, were determined. An importantExpand
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This chapter discusses the isolation, biochemistry, and function of teleost gonadotropins, which manifest distinctive chromatographic, compositional, immunological, and biological characteristics. Expand
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Results from comparative endocrinology, from structural studies on mammalian hormones, and classical data of vertebrate phylogeny have been used to outline the evolution of thyrotropic (TSH) andExpand


Effects of partially purified salmon pituitary gonadotropin on ovarian maintenance, ovulation, and vitellogenesis in the hypophysectomized catfish, Heteropneustes fossilis (Bloch).
Salmon pituitary gonadotropin (SG-G100) was tested for its gonadotropic activity in the female catfish by evaluating ovarian maintenance and ovulation, and the induction of oogenesis and vitellogenesis in the regressed ovaries of the hypophysectomized catfish during the preparatory and the postspawning periods. Expand
Ovarian maintenance in the hypophysectomized catfish, Heteropneustes fossilis (Bloch), with mammalian hypophyseal and placental hormones, and gonadal and adrenocortical steroids.
Of the two placental gonadotropins, the ovaries were better maintained with HCG than with PMS; between HCG and LH, the former was considerably more effective than the latter. Expand
Seminal vesicle' response of intact, castrate, and hypophysectomized catfish, Heteropneustes fossilis (Bloch), to testosterone propionate, prolactin, and growth hormone.
Treatment with all the three hormones at the same time resulted in marked synergism in stimulating the seminal vesicles of the catfish, Heteropneustes fossilis, and maximum response was observed after simultaneous administration of TP, LtH, and STH. Expand
The plasma gonadotropin profile during sexual maturation in a variety of salmonid fishes.
Sexual maturity of males and females was related to significant increases in plasma gonadotropin with the highest values observed for females near the time of ovulation. Expand
Comparison of the activities of two purified fish gonadotropins on adenyl cyclase activity in the goldfish ovary.
The pituitary gonadotropin from a Pacific salmon stimulates adenyl cyclase activity in homogenates of ovaries from goldfish but it is about 36 times less active than carp but a higher maximal stimulation of the cyclase is obtained with the more homologous (carp) gonadotropic hormone. Expand
A study on the correlation between the structure of the pituitary gland of the Indian catfish Heteropneustes and the seasonal changes in the ovary.
It has been experimentally demonstrated that environmental factors are not directly responsible, either collectively or individually, in making the breeders spawn. Expand
Purification d'une hormone gonadotrope hypophysaire de poisson téléostéen, la carpe (Cyprinus carpio L.)
A method of purification for a pituitary gonadotropin from a teleost fish (Cyprinus carpio L.) and the study concerning the homogeneity of this preparation leads to a quaternary structure. Expand
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Resume L'evolution du taux de gonadotropines a ete suivie dans le plasma par dosage radioimmunologique chez Carassius auratus au cours du nycthemere et pendant la periode d'ovulation. Les resultatsExpand