TRPM7: A State-Dependent Molecular Integrator of Metabolic, Ionic, and Mechanical Stress in Excitable Tissues

TRPM7 is a unique bifunctional protein that combines a divalent cation-permeable ion channel with a C-terminal serine/threonine kinase, enabling the integration of ionic, metabolic, mechanical, and redox signals into coordinated cellular responses. Beyond its established role in Mg²⁺ homeostasis, emerging evidence indicates that TRPM7 functions as a cellular state integrator that continuously monitors intracellular conditions and converts persistent environmental changes into adaptive structural, metabolic, and transcriptional programs. In this review, we examine the molecular architecture and regulatory mechanisms that underlie TRPM7 function, highlighting how channel activity, kinase-dependent and kinase-independent signaling, vesicular trafficking, and endolysosomal pathways cooperate to control cellular adaptation. We discuss recent models in which TRPM7 acts as a low-pass filter of metabolic fluctuations, regulates Mg²⁺ and Zn²⁺ availability, and coordinates mechanotransductive and stress-responsive remodeling. We further explore its roles in neuronal survival, cardiovascular homeostasis, immune regulation, fibrosis, and cancer progression, emphasizing how disruption of TRPM7-dependent state integration contributes to disease. Collectively, current evidence supports a unifying framework in which TRPM7 links bioenergetic status, ionic homeostasis, and environmental sensing to long-timescale phenotypic adaptation, establishing this chanzyme as a central regulator of cellular resilience and a promising therapeutic target in human disease.