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The Teleologic Basis of Kidney Potassium Handling: A Conceptual Review
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DOI：10.1016/j.kint.2026.04.046.png)
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Abstract
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Human kidney potassium (K+) handling evolved to clear massive Paleolithic loads, functioning as a high-capacity survival mechanism to prevent lethal hyperkalemia. This review elucidates the molecular machinery underlying this adaptation, identifying the WNK-SPAK-OSR1 kinase network as the central regulator. We detail how the distal convoluted tubule functions as a sensory organ, utilizing an "NCC switch" driven by intracellular chloride to resolve the "aldosterone paradox". This adaptation ensures K+ secretion is prioritized over Na+ reabsorption during high intake. Furthermore, we examine the roles of the gut-kidney axis and the molecular circadian clock as anticipatory feed-forward mechanisms that prime the kidney for excretion prior to absorption. This framework integrates the flow-dependent gating of BK channels, the acid-base sensitivity of ROMK, and the electroneutral pendrin/KCC3a pathway as redundant "fail-safe" valves necessary to clear massive Paleolithic K+ loads. Finally, we conclude that while the modern diet rarely challenges this massive excretory potential, the machinery remains biologically wired to prioritize the purging of K+, ensuring survival by preserving resting membrane potential above all else.
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12.6
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