Annual patterns of ocular melatonin level in the female grass puffer, Takifugu alboplumbeus: possible involvement in seasonal reproductive response

Kim, Byeong‐Hoon; Hur, Sung‐Pyo; Hyeon, Ji-Yeon; Yamashina, Fumika; Takemura, Akihiro; Lee, Young‐Don

doi:10.1007/s10695-019-00749-9

Cited by 8 publications

(10 citation statements)

References 66 publications

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“…Species such as chickens, deer, horses, and fish such as salmon, carp, seabass, tilapia, goldfish, and grass puffer (50,59,(80)(81)(82)(83)(84)(85)(86)(87)(88)(89)(90), are diurnal seasonal breeders known to be reproductively active under long day lengths. Since the first species in which GnIH was identified was the quail (1), most of the early research on the effect of GnIH on reproduction involved avian species and the relationship with photoperiodicity.…”

Section: Seasonal Breeders Long Day (Ld) Breedersmentioning

confidence: 99%

Gonadotropin Inhibitory Hormone and Its Receptor: Potential Key to the Integration and Coordination of Metabolic Status and Reproduction

2022

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Since its discovery as a novel gonadotropin inhibitory peptide in 2000, the central and peripheral roles played by gonadotropin-inhibiting hormone (GnIH) have been significantly expanded. This is highlighted by the wide distribution of its receptor (GnIH-R) within the brain and throughout multiple peripheral organs and tissues. Furthermore, as GnIH is part of the wider RF-amide peptides family, many orthologues have been characterized across vertebrate species, and due to the promiscuity between ligands and receptors within this family, confusion over the nomenclature and function has arisen. In this review, we intend to first clarify the nomenclature, prevalence, and distribution of the GnIH-Rs, and by reviewing specific localization and ligand availability, we propose an integrative role for GnIH in the coordination of reproductive and metabolic processes. Specifically, we propose that GnIH participates in the central regulation of feed intake while modulating the impact of thyroid hormones and the stress axis to allow active reproduction to proceed depending on the availability of resources. Furthermore, beyond the central nervous system, we also propose a peripheral role for GnIH in the control of glucose and lipid metabolism at the level of the liver, pancreas, and adipose tissue. Taken together, evidence from the literature strongly suggests that, in fact, the inhibitory effect of GnIH on the reproductive axis is based on the integration of environmental cues and internal metabolic status.

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Section: Seasonal Breeders Long Day (Ld) Breedersmentioning

confidence: 99%

Gonadotropin Inhibitory Hormone and Its Receptor: Potential Key to the Integration and Coordination of Metabolic Status and Reproduction

2022

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“…Melatonin is produced at the pineal organ and the retina, and is known as the key signal of photoperiodic information to the CNS in vertebrates (Carnevali et al, 2010). Previous studies have confirmed that melatonin synthesis and secretion during scotophase respond to external photoperiod changes in fishes, and that fluctuations in melatonin secretion affect the reproduct-ive endocrine system (Coon and Klein, 2006;Kim et al, 2020;Zhu et al, 2014). What is the mechanism of melatonin on functions of gonads in season breeding?…”

Section: Discussionmentioning

confidence: 97%

Changes of melatonin and its receptors in synchronizing turbot (Scophthalmus maximus) seasonal reproduction and maturation rhythm

Zhao

Liu

et al. 2021

Acta Oceanol. Sin.

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In most fish, reproduction is seasonal or periodic under the suitable conditions. In turbot (Scophthalmus maximus) farms, one of the most economically important marine flatfish species, changes in daylength could cause changes in the spawning time. In this study, to characterize the regulation of reproductive physiology following light signals, three melatonin receptors (Mtnr) investigated in turbot were named smMtnr1, smMtnr2, and smMtnr1c. Distinct expression profiles demonstrated that Mtnr mRNAs were concentrated in the brain (as detected in the hypothalamus (Hy) and mesencephalon (Me)), gonad and eye. The most abundant Mtnr1 and Mtnr2 mRNA expression levels were detected in the central nervous system at the beginning of the breeding season, suggesting that Mtnr1 and Mtnr2 may play vital roles in the regulation of turbot gonadal development. In addition, the melatonin profiles gradually increased and reached to the highest level at the spawning stage, indicating that melatonin is a potent hormone in the regulation of fish oocyte growth and maturation. The results of this study suggested that melatonin is the primary factor that transduces the light signal and regulates the physiological functions of turbot seasonal reproduction. Moreover, the results of this study may establish a foundation for further research seeking to identify fish melatonin receptors involved in the gonadal development and gamete maturation.

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“…In a study on Nile tilapia, Oreochromis niloticus , the expression of GnIH mRNA in the brain was reported to be induced by exogenous melatonin treatment and the expression of FSHβ and LHβ mRNA in the pituitary was suppressed (Kim et al, 2018). The LPXRFa ( GnIH ) mRNA expression in the grass puffer, Takifugu alboplumbeus , brain was also induced by melatonin administration (Kim et al, 2020). These results suggest that melatonin is associated with GnIH production and can act as a negative factor in reproduction.…”

Section: Discussionmentioning

confidence: 99%

Annual changes in ovarian development stages of farmed female red‐spotted grouper, Epinephelus akaara, and inducing sexual maturity using photoperiod manipulation

Kim

Choi

Lee

et al. 2022

J World Aquaculture Soc

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This study aimed to investigate the correlation between melatonin and the reproductive mechanism of farmed female red‐spotted groupers, Epinephelus akaara. Through the reproductive cycle experiment, the sexual maturity period was determined to be from June to July, following which the spawning season occurred in August. In addition, kiss1, kiss2, and GPR54 mRNA expression levels peaked in January, whereas that of sbGnRH mRNA remained at high levels from January to May and decreased during the sexual maturity and spawning seasons. During the day–night cycle, a nocturnal rhythm of AANAT2 mRNA expression was observed in the brain, and AANAT2 mRNA expression showed a seasonal pattern with increased expression during summer compared with that in winter. A correlation between melatonin and reproduction‐related genes could not be observed via melatonin administration, and sexual maturity was observed to be more induced under long photoperiod conditions compared with short photoperiod conditions. These results indicate that the reproductive mechanism of the farmed female red‐spotted grouper is related to changes in photoperiod and melatonin, and further research is needed to clarify the reproductive mechanism. Our findings provide basic information for identifying the reproductive mechanisms of farmed E. akaara.

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Annual patterns of ocular melatonin level in the female grass puffer, Takifugu alboplumbeus: possible involvement in seasonal reproductive response

Cited by 8 publications

References 66 publications

Gonadotropin Inhibitory Hormone and Its Receptor: Potential Key to the Integration and Coordination of Metabolic Status and Reproduction

Gonadotropin Inhibitory Hormone and Its Receptor: Potential Key to the Integration and Coordination of Metabolic Status and Reproduction

Changes of melatonin and its receptors in synchronizing turbot (Scophthalmus maximus) seasonal reproduction and maturation rhythm

Annual changes in ovarian development stages of farmed female red‐spotted grouper, Epinephelus akaara, and inducing sexual maturity using photoperiod manipulation

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