CD44, RHAMM, and ICAM-1 (CD44, RHAMM, ICAM-1)

CD44 is a cell surface transmembrane glycoprotein that primarily serves as the principal receptor for hyaluronan, mediating cell-cell and cell-matrix adhesion, migration, and signal transduction. RHAMM (receptor for hyaluronan-mediated motility) is another hyaluronan-binding protein involved in the cell cycle, motility, and spindle formation, found both intra- and extra-cellularly, and often functionally redundant with CD44 in motility and invasive behaviors. ICAM-1 (intercellular adhesion molecule 1) is an immunoglobulin superfamily cell adhesion molecule crucial for leukocyte trafficking and immune synapse formation, which can also bind hyaluronan and act as a coreceptor in specific signaling contexts, especially when CD44 is absent. Each receptor plays key roles in cancer, immune response, and tissue homeostasis, with complicated interplay and compensatory mechanisms that are central to both their biological functions and therapeutic intervention strategies.

Other names

Hyaluronic acid receptorEpicanLymphocyte homing receptorHyaluronan-mediated motility receptorHMMRIHABPCD54

Drugs targeting these molecules primarily act by blocking hyaluronan binding, inhibiting cell adhesion, migration, and motility, disrupting cell cycle progression, blocking spindle formation, reducing inflammation, inhibiting trans-endothelial migration, and modulating immune cell homing and metastatic signaling.