Inorganic and organic cations

Inorganic and organic cations constitute a diverse group of positively charged entities essential for life, ranging from simple elemental ions like sodium and potassium to complex organic molecules like neurotransmitters and drugs. Inorganic cations are fundamental to maintaining cellular membrane potential, osmotic balance, and signal transduction pathways (Hall & Hall, Guyton and Hall Textbook of Medical Physiology, 2020). Organic cations include endogenous metabolites such as choline and creatinine, as well as a significant portion of clinically used drugs like metformin and cimetidine (Koepsell, Pharmacological Reviews, 2020). These substances do not act as therapeutic targets themselves; rather, they are the substrates for specific transport systems, primarily the Organic Cation Transporter (OCT) family and Multidrug and Toxin Extrusion (MATE) proteins (Motohashi & Inui, Journal of Pharmaceutical Sciences, 2013). Dysregulation of cation homeostasis or transport is implicated in various conditions, including renal failure, cardiac arrhythmias, and metabolic disorders. In pharmacology, the study of these cations is crucial for predicting drug-drug interactions, as many medications compete for the same transport pathways in the liver and kidneys (Hillgren et al., Nature Reviews Drug Discovery, 2013). Consequently, while not a single receptor or enzyme, the movement and balance of these cations are central to drug efficacy and safety profiles.

Other names

Positively charged ionsOrganic cationsInorganic ionsCationic substratesOCT substratesMATE substrates

Substrate competition for Organic Cation Transporters (OCTs) and Multidrug and Toxin Extrusion (MATE) transporters, and modulation of ion-specific channels or exchangers (Koepsell, Pharmacological Reviews, 2020; Motohashi & Inui, Journal of Pharmaceutical Sciences, 2013).