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首页> 外文期刊>Marine biology >Scaling of locomotor muscle oxidative and glycolytic metabolic enzymes during the ontogeny of regional endothermy in Pacific bluefin tuna (Thunnus orientalis)
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Scaling of locomotor muscle oxidative and glycolytic metabolic enzymes during the ontogeny of regional endothermy in Pacific bluefin tuna (Thunnus orientalis)

机译：太平洋蓝鳍金枪鱼（Thunnus Orientalis）在区域吸热过程中的运动肌氧化和糖酵解代谢酶的缩放

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This study aimed to clarify the mechanisms contributing to ontogenetic differences in red locomotor muscle metabolic heat production in regionally endothermic tunas. To address this, the scaling of citrate synthase (CS), cytochrome c oxidase (COX) and pyruvate kinase (PK), enzymes involved in cellular respiration, in the red and white locomotor muscle of young (similar to 2 to similar to 16 months of age) Pacific bluefin tuna (Thunnus orientalis) during the ontogeny of red muscle endothermy was investigated. On a mass-specific basis (units g(-1) muscle tissue), CS activity scaled negatively with body mass with scaling coefficients of -0.12 for red muscle and -0.21 for white muscle, whereas COX activity did not scale in either muscle type and PK activity scaled positively in white muscle, with a scaling coefficient of 0.09, but did not scale in red muscle. Thus, proxies for mass-specific metabolic heat production potential from cellular respiration either decreased or remained constant in the red muscle during the ontogeny of red muscle endothermy. In contrast, total red muscle mass and total CS and COX activities all scaled positively with body mass, with scaling coefficients of 0.90, 0.78 and 0.92, respectively, and each of these correlated positively with the magnitude of the red muscle thermal excess. Thus, increasing total, but not mass-specific, metabolic heat production capacity contributed to the increasing red muscle thermal excess with increasing body size in juvenile T. orientalis. Additionally, transcript abundance was a poor predictor of enzyme activity. Thus, transcriptional regulation played a limited role in determining the enzymes' scaling relationships.
机译：本研究旨在阐明在区域吸热金枪鱼中对红发生肌肉代谢热量产生的综合差异的机制。为了解决这一点，柠檬酸盐合酶（Cs），细胞色素C氧化酶（COX）和丙酮酸激酶（PK），参与细胞呼吸的酶，在年轻的红色和白色运动肌中（类似于2至16个月调查了在红肌肉吸收的植物发生过程中的太平洋蓝鳍金枪鱼（Thunnus Orientalis）。在特定于群众的基础上（单位G（-1）肌肉组织），CS活性与体重呈负缩小，具有-0.12的缩放系数，用于红色肌肉和用于白色肌肉的-0.21，而COX活性没有以肌肉类型缩放PK活性在白色肌肉中呈呈阳性，缩放系数为0.09，但未在红色肌肉中缩放。因此，在红色肌肉吸收的组织发生期间，来自细胞呼吸的质量特异性代谢热量产生潜力的代理从细胞呼吸中减少或保持恒定，或者在红色肌肉中的形成。相比之下，全红色肌肉质量和总Cs和Cox活性全部与体重呈正缩放，分别具有0.90,0.78和0.92的缩放系数，并且这些缩放系数与红色肌热过量的红色幅度正相关。因此，总共增加，但不是质量特异性的，代谢热产能导致随着少年T. Orientalis中增加的身体尺寸增加的红色肌热过量。另外，转录物丰度是酶活性的差。因此，转录规则在确定酶的缩放关系方面发挥了有限的作用。

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    《Marine biology》 |2021年第8期|130.1-130.17|共17页
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    Malik Arif; Dickson Kathryn A.; Kitagawa Takashi; Fujioka Ko; Estess Ethan E.; Farwell Charles; Schuller Kathryn A.;

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    Flinders Univ S Australia Coll Sci & Engn Adelaide SA Australia;

    Calif State Univ Fullerton Dept Biol Sci Fullerton CA 92634 USA|Natl Sci Fdn Alexandria VA USA;

    Univ Tokyo Atmosphere & Ocean Res Inst Int Coastal Res Ctr Otsuchi Iwate Japan;

    Japan Fisheries Res & Educ Agcy Natl Res Inst Far Seas Fisheries Shizuoka Japan;

    Monterey Bay Aquarium Monterey CA USA;

    Monterey Bay Aquarium Monterey CA USA;

    Flinders Univ S Australia Coll Sci & Engn Adelaide SA Australia;

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