1
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Ota C, Nagashima A, Kato A. Electroneutral Na +/Cl - cotransport activity of zebrafish Slc12a10.1 expressed in Xenopus oocytes. Am J Physiol Regul Integr Comp Physiol 2024; 327:R152-R163. [PMID: 38842519 DOI: 10.1152/ajpregu.00096.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 05/24/2024] [Accepted: 05/24/2024] [Indexed: 06/07/2024]
Abstract
Na+/Cl- cotransporter 2 (Ncc2 or Slc12a10) is a membrane transport protein that belongs to the electroneutral cation-chloride cotransporter family. The Slc12a10 gene (slc12a10) is widely present in bony vertebrates but is deleted or pseudogenized in birds, some bony fishes, and most mammals. Slc12a10 is highly homologous to Ncc (Slc12a3 or Ncc1); however, there are only a few reports measuring the activity of Slc12a10. In this study, we focused on zebrafish Slc12a10.1 (zSlc12a10.1) and analyzed its activity using Xenopus oocyte electrophysiology. Analysis using Na+-selective microelectrodes showed that intracellular sodium activity (aNai) in zSlc12a10.1 oocytes was significantly decreased in Na+- or Cl--free medium and recovered when Na+ or Cl- was readded to the medium. Similar analysis using a Cl--selective microelectrode showed that intracellular chloride activity (aCli) in zSlc12a10.1 oocytes significantly decreased in Na+- or Cl--free medium and recovered when Na+ or Cl- was readded to the medium. When a similar experiment was performed with a voltage clamp, the membrane current did not change when aNai of zSlc12a10.1 oocytes was decreased in Na+-free medium. Molecular phylogenetic and synteny analyses suggest that gene duplication between slc12a10.2 and slc12a10.3 in zebrafish is a relatively recent event, whereas gene duplication between slc12a10.1 and the ancestral gene of slc12a10.2/slc12a10.3 occurred at least about 2 million years ago. slc12a10 deficiency was observed in species belonging to Ictaluridae, Salmoniformes, Osmeriformes, Batrachoididae, Syngnathiformes, Gobiesociformes, Labriformes, and Tetraodontiformes. These results indicate that zebrafish Slc12a10.1 is an electroneutral Na+/Cl-cotransporter and establish its evolutionary position among various teleost slc12a10 paralogs.NEW & NOTEWORTHY Na+/Cl- cotransporter 2 (Slc12a10; Ncc2) is a protein highly homologous to Ncc (Slc12a3; Ncc1); however, there are only a few reports measuring the activity of Slc12a10. Electrophysiological analysis of Xenopus oocytes expressing zebrafish Slc12a10.1 showed that Slc12a10.1 acts as an electroneutral Na+/Cl-cotransporter. This is the third report on the activity of Slc12a10, following previous reports on Slc12a10 in eels.
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Affiliation(s)
- Chihiro Ota
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Ayumi Nagashima
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Akira Kato
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
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2
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Breves JP, Shaughnessy CA. Endocrine control of gill ionocyte function in euryhaline fishes. J Comp Physiol B 2024:10.1007/s00360-024-01555-3. [PMID: 38739280 DOI: 10.1007/s00360-024-01555-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 02/16/2024] [Accepted: 04/11/2024] [Indexed: 05/14/2024]
Abstract
The endocrine system is an essential regulator of the osmoregulatory organs that enable euryhaline fishes to maintain hydromineral balance in a broad range of environmental salinities. Because branchial ionocytes are the primary site for the active exchange of Na+, Cl-, and Ca2+ with the external environment, their functional regulation is inextricably linked with adaptive responses to changes in salinity. Here, we review the molecular-level processes that connect osmoregulatory hormones with branchial ion transport. We focus on how factors such as prolactin, growth hormone, cortisol, and insulin-like growth-factors operate through their cognate receptors to direct the expression of specific ion transporters/channels, Na+/K+-ATPases, tight-junction proteins, and aquaporins in ion-absorptive (freshwater-type) and ion-secretory (seawater-type) ionocytes. While these connections have historically been deduced in teleost models, more recently, increased attention has been given to understanding the nature of these connections in basal lineages. We conclude our review by proposing areas for future investigation that aim to fill gaps in the collective understanding of how hormonal signaling underlies ionocyte-based processes.
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Affiliation(s)
- Jason P Breves
- Department of Biology, Skidmore College, 815 N. Broadway, Saratoga Springs, NY, 12866, USA.
| | - Ciaran A Shaughnessy
- Department of Integrative Biology, Oklahoma State University, 501 Life Sciences West, Stillwater, OK, 74078, USA
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3
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Gill transcriptome of the yellow peacock bass (Cichla ocellaris monoculus) exposed to contrasting physicochemical conditions. CONSERV GENET RESOUR 2022. [DOI: 10.1007/s12686-022-01284-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Zimmer AM, Goss GG, Glover CN. Reductionist approaches to the study of ionoregulation in fishes. Comp Biochem Physiol B Biochem Mol Biol 2021; 255:110597. [PMID: 33781928 DOI: 10.1016/j.cbpb.2021.110597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/15/2021] [Accepted: 03/22/2021] [Indexed: 10/21/2022]
Abstract
The mechanisms underlying ionoregulation in fishes have been studied for nearly a century, and reductionist methods have been applied at all levels of biological organization in this field of research. The complex nature of ionoregulatory systems in fishes makes them ideally suited to reductionist methods and our collective understanding has been dramatically shaped by their use. This review provides an overview of the broad suite of techniques used to elucidate ionoregulatory mechanisms in fishes, from the whole-animal level down to the gene, discussing some of the advantages and disadvantages of these methods. We provide a roadmap for understanding and appreciating the work that has formed the current models of organismal, endocrine, cellular, molecular, and genetic regulation of ion balance in fishes and highlight the contribution that reductionist techniques have made to some of the fundamental leaps forward in the field throughout its history.
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Affiliation(s)
- Alex M Zimmer
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada.
| | - Greg G Goss
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada
| | - Chris N Glover
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada; Faculty of Science and Technology and Athabasca River Basin Research Institute, Athabasca University, Athabasca, AB T9S 3A3, Canada
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5
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Su H, Ma D, Shang H, Fan J, Zhu H. DNA methylation of the prkaca gene involved in osmoregulation in tilapia hybrids (Oreochromis mossambicus × Oreochromis hornorum). Gene 2020; 752:144791. [PMID: 32439378 DOI: 10.1016/j.gene.2020.144791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 05/10/2020] [Accepted: 05/15/2020] [Indexed: 01/16/2023]
Abstract
Prkaca consists of the catalytic subunit alpha protein kinase A (PKA), which is involved in many cellular processes. In this study, the cDNA and genomic sequences of prkaca in tilapia hybrids (Oreochromis mossambicus × Oreochromis hornorum) were cloned and analysed. The results showed the prkaca gene consists of 11 exons and 10 introns, and its protein contains 351 amino acid residues and is clustered with Oreochromis niloticus, Maylandia zebra and Haplochromis burtoni first in a phylogenetic tree. Amino acid alignment indicates that prkaca shares the highest identity (100%) to Oreochromis niloticus, Maylandia zebra and Haplochromis burtoni. Two CpG islands of prkaca were found by MethPrimer software, and 32 CG sites were found in the proximal promoter. The methylation level of prkaca in the hybrids (0.31%) was significantly lower than that of their parents (0.94% and 3.43%) in kidney tissue (P < 0.05). The gene expression levels and DNA methylation levels of prkaca in muscle and kidney tissues of the tilapia hybrids were detected by quantitative real-time PCR and bisulfite sequencing PCR and showed a negative correlation under saline-alkali stress. The results of this research demonstrated that DNA methylation levels and prkaca mRNA expression levels were inversely correlated under saline-alkali stress, implying that heterosis is likely accompanied by DNA methylation alterations. This research provides new clues for further investigations of DNA methylation and heterosis in hybrid fish.
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Affiliation(s)
- Huanhuan Su
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Dongmei Ma
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Huiwen Shang
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Jiajia Fan
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Huaping Zhu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China.
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6
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L'Honoré T, Farcy E, Blondeau-Bidet E, Lorin-Nebel C. Inter-individual variability in freshwater tolerance is related to transcript level differences in gill and posterior kidney of European sea bass. Gene 2020; 741:144547. [PMID: 32165299 DOI: 10.1016/j.gene.2020.144547] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 01/30/2020] [Accepted: 03/08/2020] [Indexed: 02/06/2023]
Abstract
Acclimation to low salinities is a vital physiological challenge for euryhaline fish as the European sea bass Dicentrarchus labrax. This species undertakes seasonal migrations towards lagoons and estuaries where a wide range of salinity variations occur along the year. We have previously reported intraspecific differences in freshwater tolerance, with an average 30% mortality rate. In this study, we bring new evidence of mechanisms underlying freshwater tolerance in sea bass at gill and kidney levels. In fresh water (FW), intraspecific differences in mRNA expression levels of several ion transporters and prolactin receptors were measured. We showed that the branchial Cl-/HCO3- anion transporter (slc26a6c) was over-expressed in freshwater intolerant fish, probably as a compensatory response to low blood chloride levels and potential metabolic alkalosis. Moreover, prolactin receptor a (prlra) and Na+/Cl- cotransporter (ncc1) but not ncc-2a expression seemed to be slightly increased and highly variable between individuals in freshwater intolerant fish. In the posterior kidney, freshwater intolerant fish exhibited differential expression levels of slc26 anion transporters and Na+/K+/2Cl- cotransporter 1b (nkcc1b). Lower expression levels of prolactin receptors (prlra, prlrb) were measured in posterior kidney which probably contributes to the failure in ion reuptake at the kidney level. Freshwater intolerance seems to be a consequence of renal failure of ion reabsorption, which is not sufficiently compensated at the branchial level.
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Affiliation(s)
- Thibaut L'Honoré
- Univ Montpellier, MARBEC (CNRS, IFREMER, IRD, UM), Montpellier, France
| | - Emilie Farcy
- Univ Montpellier, MARBEC (CNRS, IFREMER, IRD, UM), Montpellier, France
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7
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Liu ST, Chou MY, Wu LC, Horng JL, Lin LY. Transient receptor potential vanilloid 4 modulates ion balance through the isotocin pathway in zebrafish (Danio rerio). Am J Physiol Regul Integr Comp Physiol 2020; 318:R751-R759. [DOI: 10.1152/ajpregu.00307.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Isotocin controls ion regulation through modulating the functions of ionocytes (also called mitochondria-rich cells or chloride cells). However, little is known about the upstream molecule of the isotocin system. Herein, we identify transient receptor potential vanilloid 4 (TRPV4), which regulates the mRNA and protein expressions of isotocin and affects ion regulation through the isotocin pathway. Double immunohistochemical results showed that TRPV4 is expressed in isotocinergic neurons in the hypothalamus of the adult zebrafish brain. To further elucidate the roles of TRPV4, we manipulated TRPV4 protein expression and evaluated its ionoregulatory functions in zebrafish embryos. TRPV4 gene knockdown with morpholino oligonucleotides decreased ionic contents (Na+, Cl−, and Ca2+) of whole larvae and the H+-secreting function of larval skin of zebrafish. mRNA expressions of ionocyte-related transporters, including H+-ATPase, the epithelial Ca2+ channel, and the Na+-Cl− cotransporter, were also suppressed in trpv4 morphants. Numbers of ionocytes (H+-ATPase-rich cells and Na+-K+-ATPase-rich cells) and epidermal stem cells in zebrafish larval skin also decreased after trpv4 knockdown. Our results showed that TRPV4 modulates ion balance through the isotocin pathway.
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Affiliation(s)
- Sian-Tai Liu
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Ming-Yi Chou
- Department of Life Science, National Taiwan University, Taipei, Taiwan
| | - Liang-Chun Wu
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Jiun-Lin Horng
- Department of Anatomy and Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Li-Yih Lin
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
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8
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Use of gene knockout to examine serotonergic control of ion uptake in zebrafish reveals the importance of controlling for genetic background: A cautionary tale. Comp Biochem Physiol A Mol Integr Physiol 2019; 238:110558. [PMID: 31446068 DOI: 10.1016/j.cbpa.2019.110558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/25/2019] [Accepted: 08/20/2019] [Indexed: 12/13/2022]
Abstract
Freshwater (FW) fishes inhabit dilute environments and must actively absorb ions in order to counteract diffusive salt loss. Neuroendocrine control of ion uptake in FW fishes is an important feature of ion homeostasis and several important neuroendocrine factors have been identified. The role of serotonin (5-HT), however, has received less attention despite several studies pointing to a role for 5-HT in the control of ion balance. Here, we used a gene knockout approach to elucidate the role of 5-HT in regulating Na+ and Ca2+ uptake rates in larval zebrafish. Tryptophan hydroxylase (TPH) is the rate-limiting step in 5-HT synthesis and we therefore hypothesized that ion uptake rates would be altered in zebrafish larvae carrying knockout mutations in tph genes. We first examined the effect of tph1b knockout (KO) and found that tph1bKO larvae, obtained from Harvard University, had reduced rates of Na+ and Ca2+ uptake compared to wild-type (WT) larvae from our institution (uOttawa WT), lending support to our hypothesis. However, further experiments controlling for differences in genetic background demonstrated that WT larvae from Harvard University (Harvard WT) had lower ion uptake rates than those of uOttawa WT, and that ion uptake rate between Harvard WT and tph1bKO larvae were not significantly different. Therefore, our initial observation that tph1bKO larvae (Harvard source) had reduced ion uptake rates relative to uOttawa WT was a function of genetic background and not of knockout itself. These data provide a cautionary tale of the importance of controlling for genetic background in gene knockout experiments.
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9
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Wang X, Hill D, Tillitt DE, Bhandari RK. Bisphenol A and 17α-ethinylestradiol-induced transgenerational differences in expression of osmoregulatory genes in the gill of medaka (Oryzias latipes). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2019; 211:227-234. [PMID: 31048106 PMCID: PMC6626660 DOI: 10.1016/j.aquatox.2019.04.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/02/2019] [Accepted: 04/07/2019] [Indexed: 06/04/2023]
Abstract
Embryonic bisphenol A (BPA) and 17α-ethinylestradiol (EE2) exposure can have far reaching health effects in fish, including adult onset transgenerational reproductive abnormalities, anxiety, and cardiac disorders. It is unknown whether these two environmental estrogens can induce transgenerational abnormalities in the gill. The present study examined transgenerational effects of BPA or EE2 exposure on genes that are critical for osmoregulation in fish. Medaka (Oryzias latipes) embryos were exposed to either BPA (100 μg/L) or EE2 (0.05 μg/L) for the first 7 days of embryonic development and never thereafter for the remainder of that generation (F0) and in subsequent generations of this study (F1, F2, and F3). Expression of osmoregulatory genes (NKAα1a, NKAα1b, NKAα1c, NKAα3a, NKAα3b, NKCC1a, and CFTR) were examined in gills of the first-generation (F0) adults which were directly exposed as embryo and in the fourth-generation adults (F3), which were never exposed to either of these environmental estrogens. Significant alterations in expression of osmoregulatory genes were observed in both F0 and F3 generations. Within the F0 generation, a sex-specific expression pattern was observed with a downregulation of osmoregulatory genes in males and an upregulation of osmoregulatory genes in females. At the F3 generation, this pattern reversed with the majority of the osmoregulatory genes upregulated in males and downregulated in females, suggesting that exposure to BPA and EE2 during embryonic development induced transgenerational impairment in molecular events associated with osmoregulatory functions in subsequent generations. These adverse outcomes may have impacts on physiological functions related to osmoregulation of fish inhabiting contaminated aquatic environments.
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Affiliation(s)
- Xuegeng Wang
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC 27412, United States
| | - Diamond Hill
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC 27412, United States
| | - Donald E Tillitt
- U.S. Geological Survey, Columbia Environmental Research Center, Columbia, MO 65201, United States
| | - Ramji K Bhandari
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC 27412, United States.
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10
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Ion uptake pathways in European sea bass Dicentrarchus labrax. Gene 2019; 692:126-137. [DOI: 10.1016/j.gene.2019.01.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 12/12/2018] [Accepted: 01/02/2019] [Indexed: 01/20/2023]
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11
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Wang J, He RZ, Lu GL, Luo HL, Lu DQ, Li AX. Vaccine-induced antibody level as the parameter of the influence of environmental salinity on vaccine efficacy in Nile tilapia. FISH & SHELLFISH IMMUNOLOGY 2018; 82:522-530. [PMID: 30118846 DOI: 10.1016/j.fsi.2018.08.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 08/12/2018] [Accepted: 08/13/2018] [Indexed: 06/08/2023]
Abstract
To effectively increase production and improve economic returns, the co-culture of Nile tilapia (Oreochromis niloticus) and marine shrimp has been adopted in many countries, including China. Although O. niloticus is an euryhaline fish that can tolerate elevated salinities and even full-strength seawater, fluctuations in salinity levels can undoubtedly induce stress and affect the immune response of this fish. Therefore, this study assessed the impact of salinity on vaccine efficacy in Nile tilapia, which used serum antibody level as a surrogate marker to detect vaccine efficacy. Nile tilapia were acclimatized to 0, 10, 20, or 30 ppt salinity, and then immunized with a formalin-inactivated Streptococcus agalactiae vaccine. Significantly lower levels of antibody in vaccinated fish were found at 20 and 30 ppt salinity compared to 0 and 10 ppt salinity. White blood cell counts, absolute blood lymphocyte counts, and serum bactericidal activity levels were all significantly lower in vaccinated fish at 20 and 30 ppt salinity. Elevated cortisol levels were detected in all of the fish exposure to salinity. Concentrations of serum electrolytes (Na+ and Cl-) were significantly higher in fish at 30 ppt salinity, as compared to fish at lower salinities. Furthermore, the mRNA transcription levels of three of the immune-related genes analyzed (IgM, IL-1β, and IFN-γ, but not Hsp70) were significantly inhibited in the vaccinated fish at 20 and 30 ppt salinity. A suppressed immune response and decreased vaccine efficacy were also indicated by the lower survival rate of vaccinated fish at 20 ppt salinity when challenged with S. agalactiae. Therefore, salinities ≥20 ppt negatively affected antibody production in Nile tilapia, ultimately affecting vaccine efficacy.
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Affiliation(s)
- Jing Wang
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China
| | - Run-Zhen He
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China
| | - Ge-Ling Lu
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China
| | - Heng-Li Luo
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China
| | - Dan-Qi Lu
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China.
| | - An-Xing Li
- State Key Laboratory of Biocontrol/Guangdong Provincial Key Laboratory of Improved Variety Reproduction in Aquatic Economic Animals and Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong Province, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, Shandong Province, PR China.
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12
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13
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Zhu H, Liu Z, Gao F, Lu M, Liu Y, Su H, Ma D, Ke X, Wang M, Cao J, Yi M. Characterization and expression of Na +/K +-ATPase in gills and kidneys of the Teleost fish Oreochromis mossambicus, Oreochromis urolepis hornorum and their hybrids in response to salinity challenge. Comp Biochem Physiol A Mol Integr Physiol 2018; 224:1-10. [PMID: 29852253 DOI: 10.1016/j.cbpa.2018.05.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 05/18/2018] [Accepted: 05/21/2018] [Indexed: 10/14/2022]
Abstract
Tilapia (Oreochromis mossambicus, O. urolepis hornorum, their hybrids O. mossambicus♀ × O. hornorum♂ and O. hornorum♀ × O. mossambicus♂) were exposed to a high salinity environment to evaluate their osmoregulatory responses. The plasma osmolality of all the tilapia species were elevated with the salinity challenge. The activities of Na+/K+-ATPase (NKA) in both the gill and kidney showed a similar increased change tendency compared with the control. The distribution of NKA α1 mRNA in all the examined tissues suggested that NKA α1 has a possible housekeeping role for this isoform. The amount of NKA α1 mRNA in the gill and kidney was elevated in the four fishes with similar expression patterns after transfer from freshwater to seawater. The NKAα1 mRNA expression levels in the gill reached their peak level at 24 h after transfer (P < 0.01) compared to the freshwater group, following decreases in the pretreatment level at 48 h (P > 0.05). However, the NKAα1 mRNA expression levels in the kidney were not significantly affected with increasing environmental salinity (P > 0.05). The differences in the responses to saltwater challenge may be associated with differences in saltwater tolerance between the four tilapia. The drastic increase in the plasma osmolality, NKA activities and mRNA expression suggested that the hybrids (O. mossambicus♀ × O. hornorum♂) possess heterosis in salinity responsiveness compared to that of both the parents, indicating a maternal effect on the salinity tolerance of the tilapia hybrids. This study provides a theoretical basis to further study the mechanism of fish osmoregulation response to salinity challenge.
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Affiliation(s)
- Huaping Zhu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China.
| | - Zhigang Liu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Fengying Gao
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Maixin Lu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Yujiao Liu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Huanhuan Su
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Dongmei Ma
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Xiaoli Ke
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Miao Wang
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Jianmeng Cao
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Mengmeng Yi
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
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14
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Breves JP, Keith PLK, Hunt BL, Pavlosky KK, Inokuchi M, Yamaguchi Y, Lerner DT, Seale AP, Grau EG. clc-2c is regulated by salinity, prolactin and extracellular osmolality in tilapia gill. J Mol Endocrinol 2017; 59:391-402. [PMID: 28974537 PMCID: PMC5660657 DOI: 10.1530/jme-17-0144] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 10/03/2017] [Indexed: 12/11/2022]
Abstract
Teleosts inhabiting fresh water (FW) depend upon ion-absorptive ionocytes to counteract diffusive ion losses to the external environment. A Clc Cl- channel family member, Clc-2c, was identified as a conduit for basolateral Cl- transport by Na+/Cl- cotransporter 2 (Ncc2)-expressing ionocytes in stenohaline zebrafish (Danio rerio). It is unresolved whether Clc-2c/clc-2c is expressed in euryhaline species and how extrinsic and/or intrinsic factors modulate branchial clc-2c mRNA. Here, we investigated whether environmental salinity, prolactin (Prl) and osmotic conditions modulate clc-2c expression in euryhaline Mozambique tilapia (Oreochromis mossambicus). Branchial clc-2c and ncc2 mRNAs were enhanced in tilapia transferred from seawater (SW) to FW, whereas both mRNAs were attenuated upon transfer from FW to SW. Next, we injected hypophysectomized tilapia with ovine prolactin (oPrl) and observed a marked increase in clc-2c from saline-injected controls. To determine whether Prl regulates clc-2c in a gill-autonomous fashion, we incubated gill filaments in the presence of homologous tilapia Prls (tPrl177 and tPrl188). By 24 h, tPrl188 stimulated clc-2c expression ~5-fold from controls. Finally, filaments incubated in media ranging from 280 to 450 mosmol/kg for 3 and 6 h revealed that extracellular osmolality exerts a local effect on clc-2c expression; clc-2c was diminished by hyperosmotic conditions (450 mosmol/kg) compared with isosmotic controls (330 mosmol/kg). Our collective results suggest that hormonal and osmotic control of branchial clc-2c contributes to the FW adaptability of Mozambique tilapia. Moreover, we identify for the first time a regulatory link between Prl and a Clc Cl- channel in a vertebrate.
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Affiliation(s)
- Jason P Breves
- Department of BiologySkidmore College, Saratoga Springs, New York, USA
| | - Paige L K Keith
- Department of BiologySkidmore College, Saratoga Springs, New York, USA
| | - Bethany L Hunt
- Department of BiologySkidmore College, Saratoga Springs, New York, USA
| | - K Keano Pavlosky
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i, Kaneohe, Hawaii, USA
| | - Mayu Inokuchi
- Department of Life SciencesToyo University, Itakura, Gunma, Japan
| | - Yoko Yamaguchi
- Department of Biological ScienceShimane University, Matsue, Shimane, Japan
| | - Darren T Lerner
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i, Kaneohe, Hawaii, USA
- Sea Grant College ProgramUniversity of Hawai'i at Mānoa, Honolulu, Hawaii, USA
| | - Andre P Seale
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i, Kaneohe, Hawaii, USA
- Department of Human NutritionFood and Animal Sciences, University of Hawai'i at Mānoa, Honolulu, Hawaii, USA
| | - E Gordon Grau
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i, Kaneohe, Hawaii, USA
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15
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Mohammed-Geba K, González AA, Suárez RA, Galal-Khallaf A, Martos-Sitcha JA, Ibrahim HM, Martínez-Rodríguez G, Mancera JM. Molecular performance of Prl and Gh/Igf1 axis in the Mediterranean meager, Argyrosomus regius, acclimated to different rearing salinities. FISH PHYSIOLOGY AND BIOCHEMISTRY 2017; 43:203-216. [PMID: 27573345 DOI: 10.1007/s10695-016-0280-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Abstract
Aquaculture industry in the Mediterranean region exhibits a growing interest for the Mediterranean meager Argyrosomus regius. Some preliminary works showed a good growth performance of the species in nearly isosmotic salinities. However, the patterns of alteration of prolactin (Prl) as well as growth hormone (Gh)/insulin growth factor-1 (Igf1) axis at the molecular level are not yet described in this species. Therefore, we cloned and sequenced partial cDNAs for pituitary prolactin (prl) and growth hormone (gh), hepatic insulin-like growth factor (igf1), and β-actin (actb). Expression patterns of these transcripts were tested in juveniles of A. regius acclimated to four different environmental salinities: (1) 5 ‰ (hyposmotic); (2) 12 ‰ (isosmotic); (3) 38 ‰ (hyperosmotic; seawater control); and (4) 55 ‰ (extremely hyperosmotic). All investigated transcripts shared high sequence identities with their counterparts in other perciformes. prl mRNA levels showed inverse pattern with increasing salinities. gh mRNA enhanced significantly in both 12 and 55 ‰ salinity groups in comparison with the control group, while igf1 showed its maximum expression levels under the nearly isosmotic environment. The results indicated clear sensitivity of prl, gh and igf1 to changes in environmental salinity, which can possibly control the euryhalinity capacity of this species.
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Affiliation(s)
- Khaled Mohammed-Geba
- Genetic Engineering and Molecular Biology Division, Department of Zoology, Faculty of Science, Menoufia University, Shebin El-Kom, Menoufia, Egypt.
- Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), 11519, Puerto Real, Cádiz, Spain.
- Department of Biology, Faculty of Marine and Environmental Sciences, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cadiz, 11519, Puerto Real, Cadiz, Spain.
| | - Antonio Astola González
- Department of Biomedicine, Biotechnology, and Public Health, Faculty of Sciences, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cadiz, 11519, Puerto Real, Cádiz, Spain
| | - Rubén Ayala Suárez
- Department of Biomedicine, Biotechnology, and Public Health, Faculty of Sciences, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cadiz, 11519, Puerto Real, Cádiz, Spain
| | - Asmaa Galal-Khallaf
- Genetic Engineering and Molecular Biology Division, Department of Zoology, Faculty of Science, Menoufia University, Shebin El-Kom, Menoufia, Egypt
- Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), 11519, Puerto Real, Cádiz, Spain
- Department of Biology, Faculty of Marine and Environmental Sciences, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cadiz, 11519, Puerto Real, Cadiz, Spain
| | - Juan Antonio Martos-Sitcha
- Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), 11519, Puerto Real, Cádiz, Spain
| | - Hany Mohammed Ibrahim
- Immunology and Parasitology Division, Department of Zoology, Faculty of Science, Menoufia University, Shebin El-Kom, Menoufia, Egypt
| | - Gonzalo Martínez-Rodríguez
- Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), 11519, Puerto Real, Cádiz, Spain
| | - Juan Miguel Mancera
- Department of Biology, Faculty of Marine and Environmental Sciences, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cadiz, 11519, Puerto Real, Cadiz, Spain
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16
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Bossus MC, Bollinger RJ, Reed PJ, Tipsmark CK. Prolactin and cortisol regulate branchial claudin expression in Japanese medaka. Gen Comp Endocrinol 2017; 240:77-83. [PMID: 27663882 DOI: 10.1016/j.ygcen.2016.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 09/14/2016] [Accepted: 09/19/2016] [Indexed: 12/28/2022]
Abstract
Several gill claudin (Cldn) tight junction proteins in Japanese medaka are regulated by salinity (cldn10 paralogs and cldn28b), while others are constitutively expressed (cldn27a, cldn28a and cldn30c). The role of the endocrine system in this regulation has yet to be understood. The in vitro effects of cortisol and prolactin on cldn expression in gill explant cultures were investigated in medaka. ncc2b and cftr were used as markers of specific ionocytes associated with freshwater- and seawater-acclimation, respectively. Concentration-response experiments were performed by overnight incubation with 0, 0.1, 1 and 10μgmL-1 cortisol or 0, 0.01, 0.1 and 1μgmL-1 ovine prolactin. Cortisol significantly up-regulated cftr, ncc2b, cldn10 paralogs, cldn27a and cldn30c from 1.2- to 5-fold control levels at 10μgmL-1. Cortisol had no effect on cldn28a and cldn28b. Prolactin had a concentration-dependent effect, decreasing expression of cftr (1μgmL-1, 2.2-fold) while increasing ncc2b (from 0.1μgmL-1, 6-7-fold). Prolactin up-regulated expression of 3 cldns: cldn28b (0.1 and 1μgmL-1), cldn10c and cldn10f (1μgmL-1), with up to 2-, 2.5- and 2-fold of control level, respectively. A combination experiment with both hormones showed that they act in synergy on cldn28b and have an additive effect on cftr, ncc2b, cldn10c and cldn10f. Our results showed that cortisol and prolactin are essential to maintain the expression of specific branchial claudins. This work also provides evidence that both hormones act directly on gill of medaka to modulate determinants of paracellular ion movement.
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Affiliation(s)
- Maryline C Bossus
- Department of Biological Sciences, University of Arkansas, SCEN 601, Fayetteville, AR 72701, USA; Lyon College, Derby Center for Science and Mathematics, 2300 Highland Road, Batesville, AR 72501, USA
| | - Rebecca J Bollinger
- Department of Biological Sciences, University of Arkansas, SCEN 601, Fayetteville, AR 72701, USA
| | - P Justin Reed
- Department of Biological Sciences, University of Arkansas, SCEN 601, Fayetteville, AR 72701, USA
| | - Christian K Tipsmark
- Department of Biological Sciences, University of Arkansas, SCEN 601, Fayetteville, AR 72701, USA.
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17
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Blondeau-Bidet E, Bossus M, Maugars G, Farcy E, Lignot JH, Lorin-Nebel C. Molecular characterization and expression of Na +/K +-ATPase α1 isoforms in the European sea bass Dicentrarchus labrax osmoregulatory tissues following salinity transfer. FISH PHYSIOLOGY AND BIOCHEMISTRY 2016; 42:1647-1664. [PMID: 27289588 DOI: 10.1007/s10695-016-0247-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 06/01/2016] [Indexed: 05/14/2023]
Abstract
The Na+/K+-ATPase (NKA) is considered as the main pump involved in active ion transport. In the European sea bass, Dicentrarchus labrax, we found two genes encoding for the alpha 1 subunit isoforms (NKA α1a and NKA α1b). NKA α1a and NKA α1b isoform amino acid (aa) sequences were compared through phylogeny and regarding key functional motifs between salmonids and other acanthomorph species. Analysis of aa sequences of both isoforms revealed a high degree of conservation across teleosts. The expression pattern of both nka α1a and nka α1b was measured in the gill, kidney and posterior intestine of fish in seawater (SW) and transferred to fresh water (FW) at different exposure times. Nka α1a was more expressed than nka α1b whatever the condition and the tissue analyzed. After long-term salinity acclimation (2.5 years) either in FW or SW, transcript levels of nka α1a were higher in the kidney followed by the posterior intestine and the gill. Compared to SW conditions, expression of nka α1a in FW was significantly increased or decreased, respectively, in gill and posterior intestine. In contrast, branchial nka α1b was significantly decreased in FW-acclimated fish. Short-term FW acclimation seems to rapidly increase nka α1a transcript levels in the kidney unlike in gill tissues where different gene expression levels are detected only after long-term acclimation.
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Affiliation(s)
- Eva Blondeau-Bidet
- Adaptation Ecophysiologique et Ontogenèse (AEO, UMR 9190 MARBEC), Université de Montpellier, Place Eugène Bataillon - CC092, 34095, Montpellier Cedex 5, France
| | - Maryline Bossus
- Adaptation Ecophysiologique et Ontogenèse (AEO, UMR 9190 MARBEC), Université de Montpellier, Place Eugène Bataillon - CC092, 34095, Montpellier Cedex 5, France
| | - Gersende Maugars
- Unité Biologie des Organismes et écosystèmes aquatiques (BOREA, UMR 7208), CNRS, IRD 207, Sorbonne Universités, Muséum national d'Histoire naturelle, Université Pierre et Marie Curie, Université de Caen Basse Normandie, CP32, 7 rue Cuvier, 75005, Paris, France
| | - Emilie Farcy
- Adaptation Ecophysiologique et Ontogenèse (AEO, UMR 9190 MARBEC), Université de Montpellier, Place Eugène Bataillon - CC092, 34095, Montpellier Cedex 5, France
| | - Jehan-Hervé Lignot
- Adaptation Ecophysiologique et Ontogenèse (AEO, UMR 9190 MARBEC), Université de Montpellier, Place Eugène Bataillon - CC092, 34095, Montpellier Cedex 5, France
| | - Catherine Lorin-Nebel
- Adaptation Ecophysiologique et Ontogenèse (AEO, UMR 9190 MARBEC), Université de Montpellier, Place Eugène Bataillon - CC092, 34095, Montpellier Cedex 5, France.
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18
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Yamaguchi Y, Moriyama S, Lerner DT, Grau EG, Seale AP. Autocrine Positive Feedback Regulation of Prolactin Release From Tilapia Prolactin Cells and Its Modulation by Extracellular Osmolality. Endocrinology 2016; 157:3505-16. [PMID: 27379370 PMCID: PMC6285229 DOI: 10.1210/en.2015-1969] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 06/27/2016] [Indexed: 12/24/2022]
Abstract
Prolactin (PRL) is a vertebrate hormone with diverse actions in osmoregulation, metabolism, reproduction, and in growth and development. Osmoregulation is fundamental to maintaining the functional structure of the macromolecules that conduct the business of life. In teleost fish, PRL plays a critical role in osmoregulation in fresh water. Appropriately, PRL cells of the tilapia are directly osmosensitive, with PRL secretion increasing as extracellular osmolality falls. Using a model system that employs dispersed PRL cells from the euryhaline teleost fish, Oreochromis mossambicus, we investigated the autocrine regulation of PRL cell function. Unknown was whether these PRL cells might also be sensitive to autocrine feedback and whether possible autocrine regulation might interact with the well-established regulation by physiologically relevant changes in extracellular osmolality. In the cell-perfusion system, ovine PRL and two isoforms of tilapia PRL (tPRL), tPRL177 and tPRL188, stimulated the release of tPRLs from the dispersed PRL cells. These effects were significant within 5-10 minutes and lasted the entire course of exposure, ceasing within 5-10 minutes of removal of tested PRLs from the perifusion medium. The magnitude of response varied between tPRL177 and tPRL188 and was modulated by extracellular osmolality. On the other hand, the gene expression of tPRLs was mainly unchanged or suppressed by static incubations of PRL cells with added PRLs. By demonstrating the regulatory complexity driven by positive autocrine feedback and its interaction with osmotic stimuli, these findings expand upon the knowledge that pituitary PRL cells are regulated complexly through multiple factors and interactions.
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Affiliation(s)
- Yoko Yamaguchi
- Hawai'i Institute of Marine Biology (Y.Y., D.T.L., E.G.G., A.P.S.), University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i 96744; School of Marine Biosciences (S.M.), Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; and University of Hawai'i Sea Grant College Program (D.T.L.) and Department of Human Nutrition, Food and Animal Sciences (A.P.S.), University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822
| | - Shunsuke Moriyama
- Hawai'i Institute of Marine Biology (Y.Y., D.T.L., E.G.G., A.P.S.), University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i 96744; School of Marine Biosciences (S.M.), Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; and University of Hawai'i Sea Grant College Program (D.T.L.) and Department of Human Nutrition, Food and Animal Sciences (A.P.S.), University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822
| | - Darren T Lerner
- Hawai'i Institute of Marine Biology (Y.Y., D.T.L., E.G.G., A.P.S.), University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i 96744; School of Marine Biosciences (S.M.), Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; and University of Hawai'i Sea Grant College Program (D.T.L.) and Department of Human Nutrition, Food and Animal Sciences (A.P.S.), University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822
| | - E Gordon Grau
- Hawai'i Institute of Marine Biology (Y.Y., D.T.L., E.G.G., A.P.S.), University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i 96744; School of Marine Biosciences (S.M.), Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; and University of Hawai'i Sea Grant College Program (D.T.L.) and Department of Human Nutrition, Food and Animal Sciences (A.P.S.), University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822
| | - Andre P Seale
- Hawai'i Institute of Marine Biology (Y.Y., D.T.L., E.G.G., A.P.S.), University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i 96744; School of Marine Biosciences (S.M.), Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; and University of Hawai'i Sea Grant College Program (D.T.L.) and Department of Human Nutrition, Food and Animal Sciences (A.P.S.), University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822
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19
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Tipsmark CK, Breves JP, Rabeneck DB, Trubitt RT, Lerner DT, Grau EG. Regulation of gill claudin paralogs by salinity, cortisol and prolactin in Mozambique tilapia (Oreochromis mossambicus). Comp Biochem Physiol A Mol Integr Physiol 2016; 199:78-86. [DOI: 10.1016/j.cbpa.2016.05.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 05/12/2016] [Accepted: 05/16/2016] [Indexed: 12/26/2022]
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20
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Breves JP, Inokuchi M, Yamaguchi Y, Seale AP, Hunt BL, Watanabe S, Lerner DT, Kaneko T, Grau EG. Hormonal regulation of aquaporin 3: opposing actions of prolactin and cortisol in tilapia gill. J Endocrinol 2016; 230:325-37. [PMID: 27402066 DOI: 10.1530/joe-16-0162] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 06/29/2016] [Indexed: 12/11/2022]
Abstract
Aquaporins (Aqps) are expressed within key osmoregulatory tissues where they mediate the movement of water and selected solutes across cell membranes. We leveraged the functional plasticity of Mozambique tilapia (Oreochromis mossambicus) gill epithelium to examine how Aqp3, an aquaglyceroporin, is regulated in response to osmoregulatory demands. Particular attention was paid to the actions of critical osmoregulatory hormones, namely, prolactin (Prl), growth hormone and cortisol. Branchial aqp3 mRNA levels were modulated following changes in environmental salinity, with enhanced aqp3 mRNA expression upon transfer from seawater to freshwater (FW). Accordingly, extensive Aqp3 immunoreactivity was localized to cell membranes of branchial epithelium in FW-acclimated animals. Upon transferring hypophysectomized tilapia to FW, we identified that a pituitary factor(s) is required for Aqp3 expression in FW. Replacement with ovine Prl (oPrl) was sufficient to stimulate Aqp3 expression in hypophysectomized animals held in FW, an effect blocked by coinjection with cortisol. Both oPrl and native tilapia Prls (tPrl177 and tPrl188) stimulated aqp3 in incubated gill filaments in a concentration-related manner. Consistent with in vivo responses, coincubation with cortisol blocked oPrl-stimulated aqp3 expression in vitro Our data indicate that Prl and cortisol act directly upon branchial epithelium to regulate Aqp3 in tilapia. Thus, within the context of the diverse actions of Prl on hydromineral balance in vertebrates, we define a new role for Prl as a regulator of Aqp expression.
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Affiliation(s)
- Jason P Breves
- Department of BiologySkidmore College, Saratoga Springs, New York, USA
| | - Mayu Inokuchi
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA Department of Aquatic BioscienceGraduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo, Tokyo, Japan
| | - Yoko Yamaguchi
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA
| | - Andre P Seale
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA
| | - Bethany L Hunt
- Department of BiologySkidmore College, Saratoga Springs, New York, USA
| | - Soichi Watanabe
- Department of Aquatic BioscienceGraduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo, Tokyo, Japan
| | - Darren T Lerner
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA University of Hawai'i Sea Grant College ProgramUniversity of Hawai'i at Mānoa, Honolulu, Hawai'i, USA
| | - Toyoji Kaneko
- Department of Aquatic BioscienceGraduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo, Tokyo, Japan
| | - E Gordon Grau
- Hawai'i Institute of Marine BiologyUniversity of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA
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21
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Watanabe S, Itoh K, Kaneko T. Prolactin and cortisol mediate the maintenance of hyperosmoregulatory ionocytes in gills of Mozambique tilapia: Exploring with an improved gill incubation system. Gen Comp Endocrinol 2016; 232:151-9. [PMID: 27118703 DOI: 10.1016/j.ygcen.2016.04.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 03/23/2016] [Accepted: 04/22/2016] [Indexed: 10/21/2022]
Abstract
Endocrine control of osmoregulation is essential for teleosts to adapt to various aquatic environments. Prolactin (PRL) is known as a fundamental endocrine factor for hyperosmoregulation in teleost fishes, acting on ionocytes in the gills to maintain ion concentrations of body fluid within narrow physiological ranges in freshwater conditions. Cortisol is also known as an osmoregulation-related steroid in teleosts; however, its precise function is still controversial. Here, we investigated more detailed effects of PRL and roles of cortisol on ionocytes of Mozambique tilapia (Oreochromis mossambicus) in freshwater, using an improved gill filament incubation system. This incubation system resulted in enhanced cell viability, as evaluated using the dead cell marker propidium iodide. PRL was shown to maintain the density of freshwater-type ionocytes in isolated gill filaments; this effect of PRL is not achieved by the activation of cell proliferation, but by the maintenance of existing ionocytes. Cortisol alone did not show any distinct effect on ionocyte density in isolated gill filaments. We also assessed effects of PRL and cortisol on relative mRNA levels of NCC2, NHE3, NKAa1a, and NKAa1b. PRL maintained relative NCC2 and NKAa1a mRNA abundance, and cortisol showed a stimulatory effect on relative NCC2 and NKAa1a mRNA levels in combination with PRL, though cortisol alone exerted no effect on these genes. An increase in NKAa1b mRNA abundance was detected in cortisol-treated groups. PRL treatment also maintained normal NCC2 localization at the apical membrane of the ionocytes. These results indicate that PRL maintains freshwater-type ionocytes, and that cortisol stimulates the function of ionocytes maintained by PRL.
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Affiliation(s)
- Soichi Watanabe
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan.
| | - Kohei Itoh
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
| | - Toyoji Kaneko
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
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22
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Inokuchi M, Breves JP, Moriyama S, Watanabe S, Kaneko T, Lerner DT, Grau EG, Seale AP. Prolactin 177, prolactin 188, and extracellular osmolality independently regulate the gene expression of ion transport effectors in gill of Mozambique tilapia. Am J Physiol Regul Integr Comp Physiol 2015; 309:R1251-63. [PMID: 26377558 DOI: 10.1152/ajpregu.00168.2015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 09/11/2015] [Indexed: 02/03/2023]
Abstract
This study characterized the local effects of extracellular osmolality and prolactin (PRL) on branchial ionoregulatory function of a euryhaline teleost, Mozambique tilapia (Oreochromis mossambicus). First, gill filaments were dissected from freshwater (FW)-acclimated tilapia and incubated in four different osmolalities, 280, 330, 380, and 450 mosmol/kg H2O. The mRNA expression of Na(+)/K(+)-ATPase α1a (NKA α1a) and Na(+)/Cl(-) cotransporter (NCC) showed higher expression with decreasing media osmolalities, while Na(+)/K(+)/2Cl(-) cotransporter 1a (NKCC1a) and PRL receptor 2 (PRLR2) mRNA levels were upregulated by increases in media osmolality. We then incubated gill filaments in media containing ovine PRL (oPRL) and native tilapia PRLs (tPRL177 and tPRL188). oPRL and the two native tPRLs showed concentration-dependent effects on NCC, NKAα1a, and PRLR1 expression; Na(+)/H(+) exchanger 3 (NHE3) expression was increased by 24 h of incubation with tPRLs. Immunohistochemical observation showed that oPRL and both tPRLs maintained a high density of NCC- and NKA-immunoreactive ionocytes in cultured filaments. Furthermore, we found that tPRL177 and tPRL188 differentially induce expression of these ion transporters, according to incubation time. Together, these results provide evidence that ionocytes of Mozambique tilapia may function as osmoreceptors, as well as directly respond to PRL to modulate branchial ionoregulatory functions.
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Affiliation(s)
- Mayu Inokuchi
- Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, Hawaii; Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan; and
| | - Jason P Breves
- Department of Biology, Skidmore College, Saratoga Springs, New York
| | - Shunsuke Moriyama
- School of Marine Biosciences, Kitasato University, Sagamihara, Kanagawa, Japan
| | - Soichi Watanabe
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan; and
| | - Toyoji Kaneko
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan; and
| | - Darren T Lerner
- Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, Hawaii; University of Hawaii Sea Grant College Program, University of Hawaii at Manoa, Honolulu, Hawaii
| | - E Gordon Grau
- Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, Hawaii; University of Hawaii Sea Grant College Program, University of Hawaii at Manoa, Honolulu, Hawaii
| | - Andre P Seale
- Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, Hawaii
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