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Ikenaga T, Nakamura T, Tajiri T, Tsuji M, Kato DI, Ineno T, Kobayashi Y, Tsutsui N, Kiyohara S. Diversity and evolution of serotonergic cells in taste buds of elasmobranchs and ancestral actinopterygian fish. Cell Tissue Res 2023; 394:431-439. [PMID: 37851111 DOI: 10.1007/s00441-023-03837-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 10/05/2023] [Indexed: 10/19/2023]
Abstract
A subset of gustatory cells are serotonin immunoreactive (ir) in the mammalian taste bud. In the taste bud of lamprey, elongated gustatory-like cells are also serotonin-ir. In contrast, flattened serotonin-ir cells are located only in the basal region of the taste buds in the teleosts and amphibians. These serotonin-ir cells are termed as basal cells. To evaluate the evolution and diversity of serotonergic cells in the taste bud of amniote animals, we explored the distribution and morphology of serotonin-ir cells in the taste buds of ancestral actinopterygian fish (spotted gar, sturgeon, Polypterus senegalus) and elasmobranch (stingray). In all examined animals, the taste buds contained serotonin-ir cells in their basal part. The number of serotonin-ir basal cells in each taste bud was different between these fish species. They were highest in the stingray and decreased in the order of the Polypterus, sturgeon, and gar. While serotonin immunoreactivity was observed only in the basal cells in the taste buds of the ancestral actinopterygian fish, some elongated cells were also serotonin-ir in addition to the basal cells in the stingray taste buds. mRNA of tryptophan hydroxylase 1 (tph1), a rate-limiting enzyme of the serotonin synthesis, is expressed in both the elongated and basal cells of stingray taste buds, indicating that these cells synthesize the serotonin by themselves. These results suggest that the serotonin-ir basal cells arose from the ancestor of the cartilaginous fish, and serotonin-ir cells in the elasmobranch taste bud exhibit an intermediate aspect between the lamprey and actinopterygian fish.
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Affiliation(s)
- Takanori Ikenaga
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan.
| | - Tastufumi Nakamura
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan
| | - Tatsushi Tajiri
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan
| | - Minaki Tsuji
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan
| | - Dai-Ichiro Kato
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan
| | - Toshinao Ineno
- Aquaculture Research Institute, Shingu Station, Kindai University, Wakayama, Japan
| | - Yasuhisa Kobayashi
- Department of Fisheries, Faculty of Agriculture, Kindai University, Nara, 631-0052, Japan
- Faculty of Science, Ushimado Marine Institute (UMI), Okayama University, Okayama, 701-4303, Japan
| | - Naoaki Tsutsui
- Department of Life Sciences, Graduate School of Bioresources, Mie University, Mie, 514-8507, Japan
- Faculty of Science, Ushimado Marine Institute (UMI), Okayama University, Okayama, 701-4303, Japan
| | - Sadao Kiyohara
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan
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Havelka M, Sawayama E, Saito T, Yoshitake K, Saka D, Ineno T, Asakawa S, Takagi M, Goto R, Matsubara T. Chromosome-Scale Genome Assembly and Transcriptome Assembly of Kawakawa Euthynnus affinis; A Tuna-Like Species. Front Genet 2021; 12:739781. [PMID: 34616435 PMCID: PMC8489456 DOI: 10.3389/fgene.2021.739781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/16/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
- Miloš Havelka
- South Ehime Fisheries Research Center, Ehime University, Ainan, Japan
| | - Eitaro Sawayama
- Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa, Japan
| | - Taiju Saito
- South Ehime Fisheries Research Center, Ehime University, Ainan, Japan
| | - Kazutoshi Yoshitake
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Daiki Saka
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Toshinao Ineno
- Aquaculture Research Institute, Kindai University, Shingu, Japan
| | - Shuichi Asakawa
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Motohiro Takagi
- South Ehime Fisheries Research Center, Ehime University, Ainan, Japan
| | - Rie Goto
- South Ehime Fisheries Research Center, Ehime University, Ainan, Japan
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Inatani Y, Ineno T, Sone S, Matsumoto N, Uchida K, Shimizu M. Assessment of the timing and degree of smolt development in southern populations of masu salmon Oncorhynchus masou. J Fish Biol 2018; 93:490-500. [PMID: 29931678 DOI: 10.1111/jfb.13647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 05/02/2018] [Indexed: 05/25/2023]
Abstract
The present study assessed whether non-anadromous masu salmon Oncorhynchus masou in Miyazaki, southern Japan, smoltify, and if so, at what time of the year. Yearling O. masou of Miyazaki and an anadromous population from Hokkaido, northern Japan, were reared in hatcheries in their respective regions and sampled monthly from February to June to examine the spring smoltification period. The Hokkaido population showed a peak of gill Na+ -K+ -ATPase (NKA) activity in May, which was accompanied with an increase in mRNA levels of the seawater (SW)-type NKA alpha subunit, nkaα1b. Increases in gill NKA activity and nkaa1b levels were not seen in Miyazaki populations. Transferring yearling Miyazaki population to 70% SW (salinity of 23) in mid-April resulted in an increased serum osmolality over 4 days. These results suggest that they do not smoltify in their second spring. Next, profiles of gill NKA activity and its subunit mRNA levels in under-yearling Miyazaki population in the autumn were examined. Two phenotypes differing in body color during this period were categorized as parr and smolt-like fish. Smolt-like fish had higher gill NKA activity than parr in December while there was no significant difference in gill nkaα1b levels. Smolt-like fish acclimated to 70% SW better than parr as judged by lower serum osmolality. However, serum osmolality in smolt-like fish did not return to the basal level 7 days after transfer to 70% SW, suggesting that their hypo-osmoregulatory ability was not fully developed to a level comparable to anadromous populations of this species. The present study suggests that, if O. masou in Miyazaki go though a smoltification process, it occurs in its first autumn instead of the second spring and is less pronounced compared with anadromous populations.
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Affiliation(s)
- Yu Inatani
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
| | - Toshinao Ineno
- Kobayashi Branch, Miyazaki Prefectural Fisheries Research Institute, Miyazaki, Japan
| | - Shiori Sone
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
| | - Naoto Matsumoto
- Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan
| | | | - Munetaka Shimizu
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
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Tan E, Kinoshita S, Suzuki Y, Ineno T, Tamaki K, Kera A, Muto K, Yada T, Kitamura S, Asakawa S, Watabe S. Different gene expression profiles between normal and thermally selected strains of rainbow trout, Oncorhynchus mykiss, as revealed by comprehensive transcriptome analysis. Gene 2016; 576:637-43. [DOI: 10.1016/j.gene.2015.10.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ikeguchi K, Ineno T, Itoi S, Kondo H, Kinoshita S, Watabe S. Increased levels of mitochondrial gene transcripts in the thermally selected rainbow trout (Oncorhynchus mykiss) strain during embryonic development. Mar Biotechnol (NY) 2006; 8:178-88. [PMID: 16505978 DOI: 10.1007/s10126-005-5110-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2005] [Accepted: 10/27/2005] [Indexed: 05/06/2023]
Abstract
To investigate molecular mechanisms involved in thermal resistance of rainbow trout, Oncorhynchus mykiss, embryos from thermally selected strain in various developmental stages were treated at 22 degrees C for 30 min and subsequently developed at 12 degrees C using the Donaldson strain as a reference. The embryos were evaluated for their hatching rate along with the ratio of embryos having an abnormal appearance and subjected to mRNA arbitrarily primed reverse transcription-polymerase chain reaction (RAP RT-PCR). One of the genes dominantly expressed in the thermally selected strain (COX II) coded for cytochrome c oxidase subunit II. Northern blot analysis revealed that the accumulated levels of COX II transcripts were more abundant in embryos and unfertilized eggs from the thermally selected strain than those from the Donaldson strain. Furthermore, the differential expression patterns of the ATPase 6-8 gene were similar to those of the COX II gene, whereas the ATP synthase beta-subunit gene showed no significant differences between the two strains.
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Affiliation(s)
- Koki Ikeguchi
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
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