Lanthanum as a tracer for the study of tightjunctions -- Structure and function of tightjunctions -- Methods to study the permeability of tightjunctions in cell cultures -- Lanthanum in the study of tightjunctions in different tissues -- Lanthanum as an inhibitor of ion channels -- Uptake of lanthanum salts in the body -- Lanthanum carbonate in the treatment of hyperphosphatemia in end stage renal disease