In Vivo Effects of oLH and LHRH-Analog on Sex Reversal and Plasma Sex Steroid Profiles in the Female Monopterus albus

Yeung, Wsb; Chen, H.; Chan, Siu-Hong

doi:10.1006/gcen.1993.1056

Cited by 22 publications

(16 citation statements)

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“…FSH activities were considered to be more or less similar in all the sexual stages [52]. These results, subsequently confirmed in the same species [53,54], led to the hypothesis that a rise in GTH secretion in the female could trigger precocious sex inversion at least in protogynous species. Since these initial experiments, numerous studies have looked at the involvement of the brain in sex inversion of hermaphroditic species.…”

Section: Involvement Of the Cns In Hermaphroditic Speciesmentioning

confidence: 74%

“…In the same species, sex inversion has been shown to be associated with a twoto threefold increase in the number of immunoreactive GnRH cells in the preoptic area of the brain [57], and injection of GnRH-analogue (GnRH-A) in combination with domperidone (DOM, a dopamine receptor antagonist) results in 92% of inversion after 6 weeks of treatment [58]. In the ricefield eel, treatment with GnRH-A does not promote sex inversion regardless of the female stage [53,54], although a different experiment in the same species has revealed that long-term treatments with GnRH-A, with or without DOM, induced sex inversion of females [59]. At an even higher level of brain control, neuropeptide Y (NPY) treatment of female bluehead wrasse leads to 100% of animals undergoing sex inversion [60].…”

Section: Involvement Of the Cns In Hermaphroditic Speciesmentioning

confidence: 98%

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Endocrine and environmental aspects of sex differentiation in fish

Baroiller¹,

Guiguen²,

Fostier³

1999

CMLS, Cell. Mol. Life Sci.

402

274

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This paper reviews the current knowledge differentiation, new data, including molecular apconcerning the endocrine and environmental regula-proaches, have confirmed that they are key physiologitions of both gonadal sex differentiation in gonocho-cal steps in the regulation of this process. Environmental factors can strongly influence sex differentiaristic and sex inversion in hermaphroditic fish. Within the central nervous system, gonadotropins seem to tion and sex inversion in gonochoristic and hermaphroditic fish, respectively. The most important play a role in triggering sex inversion in hermaphroditic fish. In gonochorists, although potentially ac-environmental determinant of sex would appear to be temperature in the former species, and social factors tive around this period, the hypothalamo-pituitary axis is probably not involved in triggering sex differ-in the latter. Interactions between environmental factors and genotype have been suggested for both gonoentiation. Although steroids and steroidogenic enzymes are probably not the initial triggers of sex choristic and hermaphroditic fish.

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Section: Involvement Of the Cns In Hermaphroditic Speciesmentioning

confidence: 74%

Section: Involvement Of the Cns In Hermaphroditic Speciesmentioning

confidence: 98%

Endocrine and environmental aspects of sex differentiation in fish

Baroiller¹,

Guiguen²,

Fostier³

1999

CMLS, Cell. Mol. Life Sci.

402

274

View full text Add to dashboard Cite

show abstract

“…Nakamura et al, 1989;Chang et al, 1991;Tao et al 1993). Nonetheless, it is significant that both GtH and GnRH (or derivatives thereof) stimulate gonadal steroidogenesis and induce sex-change in a number of species (Nakamura et al, 1989;Chang et al, 1991;Kramer et al, 1993;Tao et al, 1993;Yeung et al, 1993a;Reinboth and Brusle-Sicard, 1997).…”

Section: The Regulation Of Steroidogenesis During Sex-changementioning

confidence: 97%

Sex-change and gonadal steroids in sequentially-hermaphroditic teleost fish

Frisch

2004

Rev Fish Biol Fisheries

105

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page 481 Introduction 481 Why study sex-change? 482 Methods of study 483 Overview of reproductive endocrinology in fish 483 Gonadal steroids and sex-change 488 The steroids involved in sex-change The steroidal regulation of sex-change The regulation of steroidogenesis during sex-change Cerebral influences on steroidogenesis during sex-change Other salient points Limitations and recommendations 494 Summary and conclusions 495 Acknowledgements 495 References 496Abstract Sex-change is an intriguing phenomenon that is common among certain groups of teleost fishes. The process itself has a number of independent origins, although in each case it is initiated and (or) regulated by gonadal steroids. Despite the commercial importance of sex-change technology to fish culturists, our understanding of the relationship between steroids and sex-change is, at best, rudimentary. In this paper I review the current state of knowledge concerning (a) which steroids are involved, (b) how such steroids mediate sex-change, and (c) how steroidogenesis is regulated during gonadal transition. I conclude that the steroidal endocrinology of sex-change is multifarious and species specific -a result which challenges the relative stability of vertebrate endocrine axes, but one which probably reflects the independent evolution of this adaptation.

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“…Gonadotropins are thought to be responsible for sex change in various hermaphroditic fish. Some studies have shown that Lh or human chorionic gonadotropin can induce female‐to‐male sex reversal by causing extensive Leydig cell development and the formation of testicular lobules in some teleosts (Tang et al ; Koulish and Kramer ; Yeung et al ; Reinboth and Bnrusle‐Sicard ). In gobiid fish, the transition between ovary and testis is initiated with the switching of both fshr and lhr expression (Kobayashi et al ).…”

Section: Discussionmentioning

confidence: 99%

Comparison of Gonadal Development in Diploid and Triploid Hybrid Groupers, Epinephelus coioides♀ × Epinephelus lanceolatus♂

Liu

Xiao

et al. 2018

J World Aquaculture Soc

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In this study, the gonadal development of 10‐ to 43‐mo‐old diploid and triploid orange‐giant grouper hybrids, Epinephelus coioides♀ × Epinephelus lanceolatus♂, was investigated. The diploid hybrid groupers exhibited normal gonadal development and experienced vitellogenesis at 43 mo of age. In contrast, the triploid gonad was masculinized and gradually filled with spermatogenic cysts. Radioimmunoassays revealed that the diploid hybrids showed high serum E2 levels at 10 and 43 mo and high T levels at 43 mo, while the triploid hybrids showed high E2 levels at 18 and 30 mo and high T levels at 18 mo. Furthermore, the messenger RNA (mRNA) expression of genes related to reproductive regulation was examined in these hybrids. The mRNA levels of fshb, fshr, lhb, lhr, dmrt1, and sox9 varied significantly during gonadal development. Interestingly, the expression levels of fshr, lhr, dmrt1, and sox9 were higher in triploid hybrids than in diploid hybrids. The hyperactive expression of these genes may be associated with the gonadal masculinization of triploid hybrids.

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In Vivo Effects of oLH and LHRH-Analog on Sex Reversal and Plasma Sex Steroid Profiles in the Female Monopterus albus

Cited by 22 publications

References 0 publications

Endocrine and environmental aspects of sex differentiation in fish

Endocrine and environmental aspects of sex differentiation in fish

Sex-change and gonadal steroids in sequentially-hermaphroditic teleost fish

Comparison of Gonadal Development in Diploid and Triploid Hybrid Groupers, Epinephelus coioides♀ × Epinephelus lanceolatus♂

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