Tissue extracellular pH

The term "tissue extracellular pH" refers to the level of acidity or alkalinity in the extracellular fluid within tissues. In healthy humans, extracellular pH is tightly regulated around 7.4. Deviations in tissue extracellular pH occur in various physiological and pathological contexts, including cancerous tumors (where the extracellular environment becomes acidic), inflammation, ischemia, and bone remodeling[1][2][5][7][9]. The pH itself is a physical chemical property, not a receptor, enzyme, or other canonical therapeutic target molecule, but it can profoundly modulate cell behavior and the microenvironment by influencing the activity of pH-sensitive proteins, receptors (such as proton-sensing G protein-coupled receptors—GPR4, GPR65, GPR68), ion channels (such as acid-sensing ion channels, ASICs), enzymes, and transporters[7][9]. Many drugs and interventions impact extracellular pH or its consequences, but there are currently no drugs that target "tissue extracellular pH" as a discrete, druggable molecule. Additional context: - "Tissue extracellular pH" is not a single molecule or protein, but a property/parameter of tissues. - Therapeutic strategies may seek to manipulate extracellular pH indirectly (for instance, via carbonic anhydrase inhibition in cancer or sodium bicarbonate administration in acidosis), but these act on enzymes, transporters, or systemic acid-base equilibrium, not directly on "tissue extracellular pH" itself[2][9]. - In drug discovery and biomedical research, tissue extracellular pH is sometimes used as a biomarker or environmental cue to trigger action of pH-responsive drugs (for example, pH-sensitive drug release systems in tumors), but not as a classic molecular target[8][9]. NOTE: This entry is marked is_incorrect: true because "tissue extracellular pH" is not a discrete molecular drug target, but rather a measurable physiochemical property of the tissue environment. Drug and molecular targeting should be directed at specific proteins or transporters that regulate or sense extracellular pH (such as GPR4, GPR65, ASIC channels), not the pH itself.

Other names

Extracellular pHTissue pHMicroenvironment extracellular pH