Calcium absorption process

The "calcium absorption process" refers to the physiological mechanism by which dietary calcium is absorbed from the intestinal lumen into systemic circulation. This occurs primarily in the small intestine through two main pathways: a transcellular active transport route—predominant in the duodenum and regulated by vitamin D—and a passive paracellular route that functions throughout the intestine[1][2][3][4]. The transcellular pathway involves several key proteins, including apical entry channels such as TRPV6 (formerly known as CaT1), intracellular binding proteins like calbindin-D9k, and basolateral extrusion pumps such as plasma membrane Ca2+-ATPase (PMCA1b) and Na+/Ca2+ exchanger[1][2][3][4]. Vitamin D, particularly its active metabolite calcitriol [1,25(OH)₂D₃], is essential for upregulating these components via activation of its nuclear receptor VDR[2][4]. Impairments in this process can contribute to diseases like osteoporosis or rickets. However, "calcium absorption process" is not itself a molecular target but rather describes an integrated physiological function involving multiple molecular entities[1][2]. **Note:** The term “Calcium absorption process” does **not** refer to a specific molecule, protein, enzyme, transporter, or receptor. It describes an overall physiological event composed of several distinct molecular targets. Therefore: - It is **not considered** a therapeutic target on its own. - There is something incorrect with using it as if it were an individual druggable entity. For structured data extraction purposes regarding drug discovery or pharmacology databases focused on molecules/receptors/enzymes/etc., you should instead refer specifically to one of its component proteins—such as “Transient receptor potential cation channel subfamily V member 6” (TRPV6), “Vitamin D receptor” (VDR), “Plasma membrane calcium ATPase” (PMCA)—depending on your context[1][2][3].

Other names

Calcium absorptionIntestinal calcium absorptionCalcium uptake processCa2+ absorption process

Not applicable; mechanisms relate to regulation of the underlying transporters and channels, not a single druggable entity.