Lack of Kir4.1 in the Distal Convoluted Tubule Causes ENaC Hyperactivity During K ⁺ Restriction Leading to Hypokalemia

Zhong-Xiuzi Gao; Yuanyuan Yang; Rui-Juan Zhang; Fei-Hong Li; Ya-Fan Mu; Ting‐Ting Shu; Zi‐Hui Mao; Qing Zhang; Shaokang Pan; Dong‐Wei Liu; Zhangsuo Liu; Peng Wu

doi:10.1111/apha.70221

April 14, 2026Acta PhysiologicaOpen Access

Lack of Kir4.1 in the Distal Convoluted Tubule Causes ENaC Hyperactivity During K ⁺ Restriction Leading to Hypokalemia

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Key Points

Examine how the absence of Kir4.1 affects ENaC activity in the distal convoluted tubule during potassium restriction.
Analyzed the effects of Kir4.1 deletion on sodium channels in the distal convoluted tubule
Investigated the mTORC2-dependent signaling pathways involved
Assessed potassium levels under low potassium diet conditions
Kir4.1 deletion led to increased ENaC activity in the distal convoluted tubule
Low potassium diet exacerbated hypokalemia due to enhanced sodium reabsorption
SGK1/Nedd4-2 signaling pathway was identified as a key mechanism behind ENaC hyperactivity

Implication

Investigating Kir4.1's role reveals ENaC hyperactivity in the distal convoluted tubule, suggesting an impact on potassium levels.

Abstract

We conclude that Kir4.1 deletion drives ENaC hyperactivity in the DCT via the mTORC2-dependent SGK1/Nedd4-2 signaling pathway, promoting low potassium diet-induced hypokalemia.

Discussion

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Cite This Study

Gao et al. (2026) studied this question.

synapsesocial.com/papers/69e07e3b2f7e8953b7cbf431 https://doi.org/10.1111/apha.70221

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Lack of Kir4.1 in the Distal Convoluted Tubule Causes ENaC Hyperactivity During K ⁺ Restriction Leading to Hypokalemia

Key Points

Implication

Abstract

Discussion

Cite This Study

Lack of Kir4.1 in the Distal Convoluted Tubule Causes ENaC Hyperactivity During K ⁺ Restriction Leading to Hypokalemia

Key Points

Implication

Abstract

Discussion

Cite This Study

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