Potassium Chloride

Low potassium levels enhance the phosphorylation and activity of the distal convoluted tubule sodium chloride cotransporter (NCC), a mechanism which is thought to underlie the hypertensive effects of the modern low-potassium/high-sodium diet. An important mediator of potassium regulation of NCC is the chloride-sensitive With No Lysine [K] (WNK) kinase. Chloride ions (Cl−) directly inhibit WNKs, particularly WNK4, by binding to the kinase active site and suppressing autophosphorylation, a critical step in kinase activation, thereby decreasing WNK activity. Extracellular potassium in turn regulates WNK via a "voltage-driven chloride efflux" model. In this way, alterations in extracellular potassium concentration are transduced into fine control of sodium-chloride reabsorption in the distal nephron, a core molecular mechanism of potassium balance and blood pressure homeostasis.

Fig. 1 Mechanism of Low Potassium-Induced Activation of the NCC in the Distal Convoluted Tubule. (Rodan AR.; et al. 2023)

The combination of electrochemical and immunotherapy technology has great application potential in cancer treatment. Hypochlorous acid (HClO), a strong oxidizer, can be generated by oxidizing chloride ions (Cl⁻) during the electrochemical therapy of cancer. However, extracellularly produced HClO alone is not sufficient to effectively trigger tumor cell death. Wang et al. designed and prepared manganese-doped potassium chloride nanocubes modified with an amphiphilic polymer, polyethylene glycol, which act as large-scale three-dimensional nanoelectrodes to improve the generation of HClO under an alternating electric field for electrochemical immunotherapy. The experimental results showed that the nanoelectrodes can upregulate the intracellular HClO concentration to an immunogenic level to induce strong immunogenic cell death. They can also reprogram the tumor immune microenvironment by activating the immune response.

Fig. 2 Schematic diagram of electrochemical-immunological synergistic anti-tumor mechanism based on potassium chloride nanocrystals.(Wang, Gang.; et al. 2024)