RAGE is a multi-ligand member of the immunoglobulin superfamily of cell surface molecules that is
expressed in a variety of cell lines, including endothelial cells, smooth muscle cells, mononuclear
phagocytes, pericytes, neurons, cardiac myocytes, mesangial cells and hepatocytes (1, 2). RAGE
interacts with different structures to transmit a signal into the cell and recognizes three-dimensional
structures rather than specific amino acid sequences. Therefore, RAGE seems to fulfill the requirements
of a pattern-recognition receptor. As a member of the immunoglobulin superfamily, it interacts with a
diverse class of ligands, including AGEs (3, 4), HMGB1 (also known as Amphoterin) (5), amyloid
?-peptide (6), amyloid A (7), leukocyte adhesion receptors (8), prions (9), Escherichia coli curli operons
(10), ?-sheet fibrils (11) and several members of the S100 protein superfamily including
S100/calgranulins (12). Thus RAGE may have potential involvement in several pathological processes
including inflammation, diabetes, Alzheimer’s disease (AD), systemic amyloidosis, and tumor growth
(13).