Junctional Adhesion Molecule 1 / JAM1 (F11R) Protein

Background

The F11 receptor (F11R), also known as Junctional Adhesion Molecule-A (JAM-A), is an integral protein involved in cell-cell adhesion, particularly in the tight junctions of epithelial and endothelial cells. It belongs to the immunoglobulin superfamily and is vital for maintaining barrier integrity in tissues where selective permeability is essential, such as blood-brain, blood-testis, and blood-retina barriers. F11R plays a key role in regulating paracellular permeability, leukocyte transmigration, and cellular signaling, supporting immune responses, hemostasis, and wound healing. It also mediates interactions between platelets, contributing to thrombus formation and platelet aggregation. Expressed in a variety of tissues, including the endothelium, epithelium, and on platelets, F11R facilitates cell adhesion and communication in multiple physiological processes. Notably, it has been implicated in pathological conditions like inflammation, atherosclerosis, and cancer metastasis, where its dysregulation disrupts cellular integrity and promotes disease progression.