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関連する概念動画

Regulation of Metabolism01:19

Regulation of Metabolism

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

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The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
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Other Glycolytic Pathways01:24

Other Glycolytic Pathways

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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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Metabolic Rate01:25

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The human body is a powerhouse of energy, with every cell performing numerous functions that require energy. This energy production and consumption is measured by the metabolic rate, which quantifies the total heat generated by all the body's chemical reactions and mechanical work. This measurement helps to determine the rate of kilocalorie (kcal) consumption needed to fuel all ongoing activities.
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Simultaneous Electroencephalography, Real-time Measurement of Lactate Concentration and Optogenetic Manipulation of Neuronal Activity in the Rodent Cerebral Cortex
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代謝柔軟性を調節する視索前野神経回路

Julian M Roessler, Matthew Alkire, Nathan Nigrin

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    まとめ
    この要約は機械生成です。

    脳

    キーワード:
    代謝柔軟性視索前野神経回路エネルギー代謝グルコース脂肪酸骨格筋内分泌神経科学

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    科学分野:

    • 神経科学
    • 代謝
    • 内分泌学

    背景:

    • 代謝柔軟性は、動物が環境変化に燃料使用を適応させることを可能にし、生存に不可欠である。
    • ホルモンは代謝柔軟性を調節するが、中枢神経系の役割はあまり理解されていない。
    • 視索前野(avPOA)には、冬眠と代謝調節に関与するニューロンが含まれている。

    研究 の 目的:

    • avPOAの特定のニューロンの活性化が代謝燃料の選択と利用にどのように影響するかを調査すること。
    • これらのニューロンが末梢組織におけるグルコースおよび脂肪酸代謝を制御するメカニズムを特定すること。
    • 全身の代謝柔軟性を協調させる上での中枢神経系の役割を探求すること。

    主な方法:

    • マウスにおける冬眠調節性グルタミン酸作動性Adcyap1+ニューロン(avPOA Vglut2/PACAP)の急性活性化。
    • 全身の燃料利用(グルコース対脂肪酸)の測定。
    • 骨格筋における耐糖能およびインスリン感受性の評価。
    • 代謝シフトを媒介する上でのコルチコステロンの役割の調査。

    主要な成果:

    • avPOA Vglut2/PACAPニューロンの活性化は、グルコースから脂肪酸への燃料使用を急速にシフトさせた。
    • このシフトは、骨格筋におけるグルコース利用の低下と選択的なインスリン抵抗性と関連していた。
    • 代謝再プログラミングは、直接的な筋肉神経支配とは無関係に、コルチコステロンによって部分的に媒介された。
    • これらのニューロンを沈黙させると耐糖能が改善し、双方向制御が示唆された。

    結論:

    • avPOAから骨格筋への新規神経経路が、グルコース利用と代謝柔軟性を動的に調節する。
    • 中枢神経系は、燃料選択と代謝適応を協調させる上で重要な役割を果たす。
    • この経路を標的とすることは、代謝疾患管理のための新しい戦略を提供する可能性がある。