{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTRPM6 is an essential magnesium‐permeable channel that critically regulates systemic Mg²⁺ homeostasis and is indispensable during early development. Studies in mice fed low‐magnesium diets have revealed that TRPM6 expression in the kidney and intestine is up‐regulated to optimize Mg²⁺ absorption and support fundamental cellular functions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In addition, modulation of TRPM6 by the repressor of estrogen receptor activity (REA) indicates a rapid, hormone‐mediated regulatory mechanism whereby 17β-estradiol treatment enhances TRPM6‐mediated currents."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Genetic inactivation of TRPM6 in murine models results in severe developmental defects—including neural tube malformations—underscoring its central role in organogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Moreover, in mammary epithelial cells, low extracellular magnesium triggers a rapid up-regulation of TRPM6 mRNA and protein, suggesting that this channel adapts dynamically to changes in magnesium availability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, TRPM6 function is further refined by its interactions with regulatory proteins and by genetic modulation in disease models. For example, under oxidative stress conditions, the methionine sulfoxide reductase B1 (MsrB1) associates with TRPM6 to partly rescue its channel activity from hydrogen peroxide–induced inhibition"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", while targeted knockout studies confirm that loss of TRPM6 severely disturbs magnesium balance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Altered TRPM6 expression is also observed in experimental models of asthma, correlating with changes in plasma and erythrocyte magnesium levels"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", and in conditions of hyperaldosteronism that are associated with electrolyte imbalances."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In the placenta, TRPM6 contributes to maternal–fetal calcium transport—a process crucial for fetal bone mineralization"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "—and its intestinal expression is key for maintaining lifelong magnesium homeostasis, with dietary supplementation able to rescue deficiency phenotypes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther integrative analyses illustrate the complex regulatory landscape in which TRPM6 operates. The formation of heteromeric TRPM6/TRPM7 channels fine-tunes sensitivity to physiological Mg²⁺ and Mg·ATP concentrations, ensuring robust transepithelial ion transport even under dynamic cellular conditions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " In addition, uromodulin (UMOD) interacts with TRPM6 to enhance its cell–surface abundance by inhibiting dynamin-dependent endocytosis, thereby contributing to renal magnesium reabsorption."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Finally, TRPM6 function extends to cardiovascular regulation, where its role in the augmentation of renin secretion during the active phase implicates this channel in the circadian control of blood pressure."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Lusliany J Rondón, Wouter M Tiel Groenestege, Yves Rayssiguier, et al. 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