Lanthanum as a tracer for the study of tight junctions -- Structure and function of tight junctions -- Methods to study the permeability of tight junctions in cell cultures -- Lanthanum in the study of tight junctions 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.