DOTA-chelate complex (DOTA (when referring to the chelator); DOTA-chelate is not abbreviated further in routine scientific use)

A DOTA-chelate complex refers to the molecular entity formed when the macrocyclic chelator DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) binds (chelates) a metal ion, typically through all four nitrogen atoms and four carboxylate groups of its tetraaza ring, often “wrapping” around the metal. DOTA itself is not a biological target but a chemical tool widely used in bioconjugation, imaging, and therapy due to its high-affinity, stable complexes with di- and trivalent metal ions. DOTA-chelate complexes are foundational in MRI (Gd-DOTA), targeted radionuclide therapy (e.g., ^90Y-DOTA and ^177Lu-DOTA conjugates), and nuclear imaging. While not a receptor, enzyme, or other classic therapeutic target, DOTA-chelate complexes are essential enabling platforms for targeting and imaging biological molecules when attached to biomolecule ligands (such as peptides or antibodies).

Other names

tetraxetan1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acidDOTA complexesDOTA-conjugateDOTA-peptide

Chelation and stable delivery of metal ions (e.g., Gd3+ for MRI, radiometals for therapeutic/diagnostic use). The DOTA-chelate provides inert, high-affinity binding to metal ions, minimizing their release in vivo