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Effects of aging on the activities of pyruvate dehydrogenase complex and its kinase in rat heart

Identifieur interne : 001D00 ( Istex/Corpus ); précédent : 001C99; suivant : 001D01

Effects of aging on the activities of pyruvate dehydrogenase complex and its kinase in rat heart

Auteurs : Naoya Nakai ; Yuzo Sato ; Yoshiharu Oshida ; Atsushi Yoshimura ; Noriaki Fujitsuka ; Satoru Sugiyama ; Yoshiharu Shimomura

Source :

RBID : ISTEX:3DA80D27C65F7F414E65C4D95AC419900F133886

Abstract

Effects of aging on the activities of heart pyruvate dehydrogenase complex and pyruvate dehydrogenase kinase were examined using 7, 35 and 60 wk old rats. Aging did not affect the total activity of pyruvate dehydrogenase complex but decreased the activity state (percentage of active form) of the complex in rats under the fed condition (52%, 36% and 26% for 7, 35 and 60 wk old rats, respectively). This decrease in the complex activity with aging was suggested to be associated with an age-related decrease in the blood glucose disposal. Starvation for 24 h decreased the activity state to less than 3% in all of the age groups. The activity of pyruvate dehydrogcnase kinase associated with the complex was not related to the alteration in the activity state of the complex; the kinase activity was slightly lower in 60 wk old rats than in the younger rats under the fed condition and activation of the kinase by starvation was greater in the younger rats. The mechanism for the decrease in activity of pyruvate dehydrogenase complex was discussed on the basis of glucose and fatty acid utilization of heart muscle cells.

Url:
DOI: 10.1016/S0024-3205(97)00286-5

Links to Exploration step

ISTEX:3DA80D27C65F7F414E65C4D95AC419900F133886

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<ce:textfn>Institute of Applied Biochemistry, Gifu 505-01, Japan</ce:textfn>
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<ce:affiliation id="AFF2">
<ce:label>b</ce:label>
<ce:textfn>Department of Bioscience, Nagoya Institute of Technology, Nagoya 466, Japan</ce:textfn>
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<ce:label></ce:label>
<ce:text>Corresponding author: Yoshiharu Shimomura, Ph.D., Department of Bioscience, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, Japan. +81-52-735-5198 (TEL), +81-52-735-5201 (FAX).</ce:text>
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<ce:simple-para>Effects of aging on the activities of heart pyruvate dehydrogenase complex and pyruvate dehydrogenase kinase were examined using 7, 35 and 60 wk old rats. Aging did not affect the total activity of pyruvate dehydrogenase complex but decreased the activity state (percentage of active form) of the complex in rats under the fed condition (52%, 36% and 26% for 7, 35 and 60 wk old rats, respectively). This decrease in the complex activity with aging was suggested to be associated with an age-related decrease in the blood glucose disposal. Starvation for 24 h decreased the activity state to less than 3% in all of the age groups. The activity of pyruvate dehydrogcnase kinase associated with the complex was not related to the alteration in the activity state of the complex; the kinase activity was slightly lower in 60 wk old rats than in the younger rats under the fed condition and activation of the kinase by starvation was greater in the younger rats. The mechanism for the decrease in activity of pyruvate dehydrogenase complex was discussed on the basis of glucose and fatty acid utilization of heart muscle cells.</ce:simple-para>
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<ce:section-title>Keywords</ce:section-title>
<ce:keyword>
<ce:text>pyruvate dehydrogenase complex</ce:text>
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<ce:keyword>
<ce:text>pyruvate dehydrogenase kinase</ce:text>
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<ce:keyword>
<ce:text>aging</ce:text>
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<ce:keyword>
<ce:text>starvation</ce:text>
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<namePart type="given">Naoya</namePart>
<namePart type="family">Nakai</namePart>
<affiliation>Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya 464-01, Japan</affiliation>
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<namePart type="given">Atsushi</namePart>
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<namePart type="given">Noriaki</namePart>
<namePart type="family">Fujitsuka</namePart>
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<affiliation>Corresponding author: Yoshiharu Shimomura, Ph.D., Department of Bioscience, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, Japan. +81-52-735-5198 (TEL), +81-52-735-5201 (FAX).</affiliation>
<affiliation>Department of Bioscience, Nagoya Institute of Technology, Nagoya 466, Japan</affiliation>
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<abstract lang="en">Effects of aging on the activities of heart pyruvate dehydrogenase complex and pyruvate dehydrogenase kinase were examined using 7, 35 and 60 wk old rats. Aging did not affect the total activity of pyruvate dehydrogenase complex but decreased the activity state (percentage of active form) of the complex in rats under the fed condition (52%, 36% and 26% for 7, 35 and 60 wk old rats, respectively). This decrease in the complex activity with aging was suggested to be associated with an age-related decrease in the blood glucose disposal. Starvation for 24 h decreased the activity state to less than 3% in all of the age groups. The activity of pyruvate dehydrogcnase kinase associated with the complex was not related to the alteration in the activity state of the complex; the kinase activity was slightly lower in 60 wk old rats than in the younger rats under the fed condition and activation of the kinase by starvation was greater in the younger rats. The mechanism for the decrease in activity of pyruvate dehydrogenase complex was discussed on the basis of glucose and fatty acid utilization of heart muscle cells.</abstract>
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<identifier type="ISSN">0024-3205</identifier>
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