Prolactin and Upstream Migration of the Amphidromous Teleost, Ayu<i>Plecoglossus altivelis</i>

Yada, Takashi; Iguchi, Kei’ichiro; Yamamoto, Shoichiro; Sakano, Hiroyuki; Takasawa, Toshihide; Katsura, Kazuhiko; Abe, Nobuhiko; Aawata, Satoshi; Uchida, Keiji

doi:10.2108/zs130181

Cited by 7 publications

(5 citation statements)

References 53 publications

(86 reference statements)

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“…Wang et al [53] reported that Aquaporin I performs an important regulatory function in Coilia nasus under conditions of salinity stress. Prolactin has also been reported to have a regulatory function when freshwater fish swim into seawater [54]. In this study, the prolactin receptors were upregulated to assist with the anti-stress response of C. nasus.…”

Section: Response Regulation Under Salinity and Cold Effectmentioning

confidence: 67%

Transcriptome analysis of the brain provides insights into the regulatory mechanism for Coilia nasus migration

Wang

Tang

et al. 2020

BMC Genomics

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Background: Coilia nasus (C. nasus) is an important anadromous fish species that resides in the Yangtze River of China, and has high ecological and economical value. However, wild resources have suffered from a serious reduction in population, attributed to the over-construction of water conservancy projects, overfishing, and environmental pollution. The Ministry of Agriculture and Rural Affairs of the People's Republic of China has issued a notice banning the commercial fishing of wild C. nasus in the Yangtze River. Wild C. nasus populations urgently need to recover. A better understanding of C. nasus migration patterns is necessary to maximize the efficiency of conservation efforts. Juvenile C. nasus experience a simultaneous effect of increasing salinity and cold stress during seaward migration, and the brain plays a comprehensive regulatory role during this process. Therefore, to explore the early seaward migration regulation mechanism of juvenile C. nasus, we performed a comparative transcriptome analysis on the brain of juvenile C. nasus under salinity and cold stress simultaneously. Results: Relevant neurotransmitters, receptors, and regulatory proteins from three categories of regulatory pathway play synergistic regulatory roles during the migration process: neuronal signaling, the sensory system, and environmental adaptation. The significant differential expression of growth-related hormones, thyroid receptors, haptoglobin, and prolactin receptors was similar to the results of relevant research on salmonids and steelhead trout. Conclusions: This study revealed a regulatory network that the brain of juvenile C. nasus constructs during migration, thereby providing basic knowledge on further studies could build on. This study also revealed key regulatory genes similar to salmonids and steelhead trout, thus, this study will lay a theoretical foundation for further study on migration regulation mechanism of anadromous fish species.

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Section: Response Regulation Under Salinity and Cold Effectmentioning

confidence: 67%

Transcriptome analysis of the brain provides insights into the regulatory mechanism for Coilia nasus migration

Wang

Tang

et al. 2020

BMC Genomics

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“…The survival time seemed to be related to their native environmental salinity, suggesting that, upon hyposmotic challenge, the reliance on pituitary control of osmoregulation was less critical in FW species relative to their congeners that were naturally subject to variations in salinity. In anadromous fishes, such as salmonids and ayu ( Plecoglossus altivelis ), PRL seems to be involved in their migration from FW to SW and vice versa (Onuma et al, 2003; Taniyama et al, 1999; Yada et al, 2010; Yada et al, 2014), but of limited importance in FW osmoregulation (Makino et al, 2007; Manzon, 2002). Two PRL isoforms have been reported in tilapias (Specker et al, 1985), chum salmon ( Oncorhynchus keta ; Yasuda et al, 1986), common carp ( Cyprinus carpio ; Yasuda et al, 1987) and Japanese eel ( Anguilla japonica ; Suzuki et al, 1991).…”

Section: Discussionmentioning

confidence: 99%

Acute salinity tolerance and the control of two prolactins and their receptors in the Nile tilapia (Oreochromis niloticus) and Mozambique tilapia (O. mossambicus): A comparative study

Yamaguchi

Breves

Haws

et al. 2018

General and Comparative Endocrinology

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Osmoregulation in vertebrates is largely controlled by the neuroendocrine system. Prolactin (PRL) is critical for the survival of euryhaline teleosts in fresh water by promoting ion retention. In the euryhaline Mozambique tilapia (Oreochromis mossambicus), pituitary PRL cells release two PRL isoforms, PRL and PRL, in response to a fall in extracellular osmolality. Both PRLs function via two PRL receptors (PRLRs) denoted PRLR1 and PRLR2. We conducted a comparative study using the Nile tilapia (O. niloticus), a close relative of Mozambique tilapia that is less tolerant to increases in environmental salinity, to investigate the regulation of PRLs and PRLRs upon acute hyperosmotic challenges in vivo and in vitro. We hypothesized that differences in the regulation of PRLs and PRLRs underlie the variation in salinity tolerance of tilapias within the genus Oreochromis. When transferred from fresh water to brackish water (20‰), Nile tilapia increased plasma osmolality and decreased circulating PRLs, especially PRL, to a greater extent than Mozambique tilapia. In dispersed PRL cell incubations, the release of both PRLs was less sensitive to variations in medium osmolality in Nile tilapia than in Mozambique tilapia. By contrast, increases in pituitary and branchial prlr2 gene expression in response to a rise in extracellular osmolality were more pronounced in Nile tilapia relative to its congener, both in vitro and in vivo. Together, these results support the conclusion that inter-specific differences in salinity tolerance between the two tilapia congeners are tied, at least in part, to the distinct responses of both PRLs and their receptors to osmotic stimuli.

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“…Previous research has shown that ayu undergoes changes in hormonal levels (prolactin and thyroxine) in accordance with the onset of upstream migration and after riverine residency (Tsukamoto & Uchida, 1992; Yada et al, 2014). This physiological change can be tracked by the quantification of mRNA (Yada et al, 2014). These findings imply that specific detection of eRNA derived from mRNA regarding hormone synthesis might be able to differentiate groups with different behaviors (i.e., sea residents, upstream migrants, and river residents).…”

Section: Discussionmentioning

confidence: 92%

“…Compared to eDNA, eRNA has the potential to significantly improve spatial and temporal resolution in biological monitoring due to its rapid turnover and enhanced diagnostics of population and community characteristics (Yates et al, 2021). Previous research has shown that ayu undergoes changes in hormonal levels (prolactin and thyroxine) in accordance with the onset of upstream migration and after riverine residency (Tsukamoto & Uchida, 1992;Yada et al, 2014). This physiological change can be tracked by the quantification of mRNA (Yada et al, 2014).…”

Section: Discussionmentioning

confidence: 98%

Linkage between spatiotemporal distribution of environmental DNA and phenological activity in an amphidromous fish, ayu Plecoglossus altivelis altivelis, in a river located in its northernmost distributional area

Yonago,

Kawakami,

Kasai

2024

Journal of Fish Biology

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Environmental DNA (eDNA) is a promising tool for the continuous monitoring of fish ecology and diversity. However, its potential for describing the phenological activity of fish has rarely been examined. This study aimed to elucidate a linkage between the spatiotemporal distribution of eDNA and the phenology of an amphidromous fish, ayu Plecoglossus altivelis altivelis, in a river in Hokkaido, Japan, which is its northernmost distributional area. A significant positive correlation between eDNA concentration and catch per unit effort of P. a. altivelis in the river confirmed the use of eDNA as a surrogate for the abundance of P. a. altivelis. eDNA of P. a. altivelis was first detected in late April on a sandy beach adjacent to the river mouth. Subsequent to its first detection at the lowest site in the river in early May, eDNA spread throughout the river, indicating the upstream migration of P. a. altivelis. Spawning activity was also represented by a rapid increase in eDNA concentration and its surge at night in the lowest reaches of the river during September and October. These results suggest that upstream migration and spawning primarily commenced when the water temperature reached 10°C and decreased below 20°C, respectively. This observation is consistent with the behavioral responses observed in P. a. altivelis populations from other regions of Japan. Consequently, this study demonstrated that eDNA distribution was closely linked to the phenological activity of P. a. altivelis and that eDNA is a powerful tool for studying the phenology of migratory fishes.

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Prolactin and Upstream Migration of the Amphidromous Teleost, AyuPlecoglossus altivelis

Cited by 7 publications

References 53 publications

Transcriptome analysis of the brain provides insights into the regulatory mechanism for Coilia nasus migration

Transcriptome analysis of the brain provides insights into the regulatory mechanism for Coilia nasus migration

Acute salinity tolerance and the control of two prolactins and their receptors in the Nile tilapia (Oreochromis niloticus) and Mozambique tilapia (O. mossambicus): A comparative study

Linkage between spatiotemporal distribution of environmental DNA and phenological activity in an amphidromous fish, ayu Plecoglossus altivelis altivelis, in a river located in its northernmost distributional area

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