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19 results on '"Okita, Kogen"'

13. Seasonal changes and endocrine regulation of gonadal development in hatchery-produced Pacific bluefin tuna Thunnus orientalis broodstock in sea cages

Author

Higuchi, Kentaro, primary, Suzuki, Ayako, additional, Eba, Takeshi, additional, Hashimoto, Hiroshi, additional, Kumon, Kazunori, additional, Morioka, Taizo, additional, Shiozawa, Satoshi, additional, Soma, Satoshi, additional, Okita, Kogen, additional, Takashi, Toshinori, additional, and Gen, Koichiro, additional

Published
2021
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14. Puffer smells tetrodotoxin

Author

Okita, Kogen, Yamazaki, Hideki, Sakiyama, Kazutaka, Yamane, Hikaru, Niina, Shinya, Takatani, Tomohiro, Arakawa, Osamu, and Sakakura, Yoshitaka

Published
2013
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17. The Japanese Society of Fisheries Science

Author

Okita, Kogen, Tan, Engkong, Satone, Hina, Kinoshita, Shigeharu, Asakawa, Shuichi, Ojima, Daisuke, Yamazaki, Hideki, Sakiyama, Kazutaka, Takatani, Tomohiro, Arakawa, Osamu, Hagiwara, Atsushi, and Sakakura, Yoshitaka

Subjects
Takifugu rubripes, nervous system, Central nervous system, musculoskeletal, neural, and ocular physiology, Feeding center, Reward system, heterocyclic compounds, RNA sequencing, Tetrodotoxin (TTX)
Abstract

To reveal the sensing of tetrodotoxin (TTX) by tiger puffer Takifugu rubripes juveniles and its action in the central nervous system (CNS), we conducted transcriptome analysis using next-generation sequencing for the olfactory system and brain of non-toxic cultured juveniles administered TTX. Sixty-seven million reads from the nasal region (olfactory epithelium and skin) and the brain of each of three individuals of the control, TTX-sensing and TTX-administered juveniles were assembled into 153,958 contigs. Mapping raw reads from each sample onto the nucleotide sequences of predicted transcripts in the T. rubripes genome (FUGU version 4) and the de novo assembled contigs to investigate their frequency of expression revealed that the expression of 21 and 81 known genes significantly changed in TTX-sensing and TTX-administered juveniles in comparison with control juveniles, respectively. These genes included those related to feeding regulation and a reward system, and indicated that TTX ingestion of T. rubripes juveniles is controlled in the feeding center in the brain, that T. rubripes may sense TTX as a reward, and that accumulated TTX directly acts on the central nervous system to adjust TTX ingestion.

Published
2017

18. Transcriptome analysis of tetrodotoxin sensing and tetrodotoxin action in the central nervous system of tiger puffer Takifugu rubripes juveniles

Author

Okita, Kogen, primary, Tan, Engkong, additional, Satone, Hina, additional, Kinoshita, Shigeharu, additional, Asakawa, Shuichi, additional, Ojima, Daisuke, additional, Yamazaki, Hideki, additional, Sakiyama, Kazutaka, additional, Takatani, Tomohiro, additional, Arakawa, Osamu, additional, Hagiwara, Atsushi, additional, and Sakakura, Yoshitaka, additional

Published
2018
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19. Effects of triploidization on light sensitivity in larval stage of Pacific bluefin tuna Thunnus orientalis.

Author

Hayashida, Takao, Higuchi, Kentaro, Okita, Kogen, Takashi, Toshinori, Kazeto, Yukinori, and Gen, Koichiro

Subjects
*FISH larvae, *TUNA, *SENSORY perception, *CELL size, *LARVAE
Abstract

Triploidization influences various biological characteristics of fish, which is associated with reductions in the number of multiple cell types in different tissues/organs. Our behavioral analyses revealed that triploid Pacific bluefin tuna (Thunnus orientalis) larvae exhibit lower sensitivity to light compared to diploids. Furthermore, histological analyses revealed a reduction in the number of ganglion cells and an increase in their size in the retinas of triploid T. orientalis larvae. Our findings provide the first evidence indicating that triploidization reduces sensory perception during the larval stage of fish. [ABSTRACT FROM AUTHOR]

Published
2024
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