Calcium metabolism pathway

The **calcium metabolism pathway** refers to a complex physiological network that regulates the movement and balance of calcium ions in and out of body compartments—including absorption from the gut (regulated by active vitamin D), storage/release from bone (regulated by parathyroid hormone [PTH] and calcitonin), renal reabsorption/excretion in kidneys—and their distribution between blood plasma and tissues. This process is essential for maintaining plasma calcium homeostasis within narrow limits. Key molecular players include hormones like PTH and calcitonin; transporters such as TRPV6/5 channels for intestinal absorption; calbindin proteins; Na+/Ca2+ exchangers; Ca2+-ATPases for cellular export/import; intracellular stores regulated by IP3R/RYR receptors in endoplasmic reticulum/muscle cells; mitochondrial uniporters for energy coupling. Dysregulation leads to various clinical conditions including osteoporosis, hypocalcemia/hypercalcemia syndromes, chronic kidney disease-related mineral disorders. The “calcium metabolism pathway” is not itself a druggable molecular target but encompasses many individual targets that can be modulated therapeutically. **Note:** "Calcium metabolism pathway" is not a canonical molecule/receptor but describes an integrated biological process involving multiple molecules. It should not be considered a therapeutic target per se—rather it comprises several valid drug targets within its network.

Other names

Calcium homeostasisCalcium signaling pathwayCalcium regulatory pathwayCalcium metabolic pathway

Drugs target specific proteins or receptors within the calcium metabolism pathway—such as parathyroid hormone receptor agonists/antagonists or vitamin D receptor modulators—but not the entire pathway as a single entity