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Regulation and function of the mammalian tricarboxylic acid cycle

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JOURNAL OF BIOLOGICAL CHEMISTRY
卷 299, 期 2, 页码 -

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DOI: 10.1016/j.jbc.2022.102838

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The tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, is a central metabolic pathway that oxidizes nutrients to support cellular energy production. Recent studies have shown that the TCA cycle is dynamic and can be utilized in cancer and other pathological states. This review provides a comprehensive overview of the TCA cycle, including its origins, discovery, requirements for sustained function, and regulatory nodes. It also discusses recent advances in understanding the flexibility and heterogeneity of TCA cycle activity in mammalian cells, emphasizing the importance of differential regulation and configuration to meet the specific requirements of distinct cell states.
The tricarboxylic acid (TCA) cycle, otherwise known as the Krebs cycle, is a central metabolic pathway that performs the essential function of oxidizing nutrients to support cellular bioenergetics. More recently, it has become evident that TCA cycle behavior is dynamic, and products of the TCA cycle can be co-opted in cancer and other pathologic states. In this review, we revisit the TCA cycle, including its potential origins and the history of its discovery. We provide a detailed accounting of the requirements for sustained TCA cycle function and the critical regulatory nodes that can stimulate or constrain TCA cycle ac-tivity. We also discuss recent advances in our understanding of the flexibility of TCA cycle wiring and the increasingly appre-ciated heterogeneity in TCA cycle activity exhibited by mammalian cells. Deeper insight into how the TCA cycle can be differentially regulated and, consequently, configured in different contexts will shed light on how this pathway is primed to meet the requirements of distinct mammalian cell states.

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