Beyond singular effectors: The futile creatine cycle from molecular mechanism to integrated adipocyte thermogenesis.

The futile creatine cycle (FCC) is defined as an ATP-dependent thermogenic mechanism that acts in parallel with UCP1, integrating creatine, lipids, and calcium into adipocyte heat production.

• Why it matters: Canonical UCP1-centered models miss how thermogenic activation can increase proton leak without fully dissipating the protonmotive force, leaving the physiological role of futile cycles unclear.
• What they did: The authors synthesize evidence from selective loss-of-function, reconstitution, and genetic interaction studies that test pathway disruption and restoration to quantify FCC’s thermogenic contribution alongside UCP1.
• The result: These experiments establish FCC’s physiological relevance and provide a framework to connect biochemical mechanisms of other thermogenic cycles to their actual in vivo contributions beyond maximal respiratory rates.

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