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mTORC2 critically regulates renal potassium handling.

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    Mammalian target of rapamycin complex 2 (mTORC2) is crucial for kidney potassium regulation. Deleting mTORC2 in kidney tubules impairs potassium excretion, leading to hyperkalemia, even with high aldosterone levels.

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    Area of Science:

    • Nephrology
    • Cellular Biology
    • Molecular Physiology

    Background:

    • The mechanistic target of rapamycin (mTOR) pathway is vital for cellular homeostasis.
    • While mTOR complex 1 (mTORC1) is well-studied in the kidney, mTOR complex 2 (mTORC2) function in renal tubules remains unclear.

    Purpose of the Study:

    • To investigate the role of mTORC2 in the distal tubules of the kidney.
    • To determine how mTORC2 deficiency affects renal handling of electrolytes, particularly potassium.

    Main Methods:

    • Generation of mice with mTORC2 specifically deleted in distal renal tubules (Rictorfl/fl Ksp-Cre mice).
    • Assessment of renal function and electrolyte balance under normal, low-sodium, and high-potassium dietary conditions.
    • Electrophysiological studies including patch-clamp analysis of renal tubular segments to measure ion channel activity.

    Main Results:

    • Rictorfl/fl Ksp-Cre mice exhibited a significant increase in plasma aldosterone but developed severe hyperkalemia on a high-potassium diet.
    • Impaired activation of serum- and glucocorticoid-inducible kinase 1 (SGK1) and PKC-α was observed, indicating a block in potassium secretion.
    • Apical potassium currents via ROMK channels were markedly reduced in Rictorfl/fl Ksp-Cre mice, while epithelial sodium channel (ENaC) activity was preserved.

    Conclusions:

    • mTORC2 plays a critical and nonredundant role in regulating potassium excretion in the distal renal tubules.
    • The findings highlight mTORC2 as a key regulator of renal potassium handling and kaliuresis.