Immunoglobulin superfamily cell adhesion molecule (IgSF CAM (or IgCAM))

Immunoglobulin superfamily cell adhesion molecules (IgSF CAMs) are a large group of proteins characterized by extracellular immunoglobulin-like domains that mediate calcium-independent cell-cell recognition and binding. They play essential roles in diverse biological processes including neural development—regulating neurite outgrowth, synapse formation, and plasticity—as well as immune responses through intercellular communication among leukocytes and endothelial cells. Prominent subfamilies include NCAMs, ICAMs, VCAMs, L1CAMs ("L1 family"), nectins/nectin-like molecules ("Necls"), each with distinct but sometimes overlapping functions across tissues. Dysregulation or mutation of individual members is implicated in cancers, autoimmune disorders/inflammation, neurodevelopmental syndromes such as mental retardation syndromes linked to L1 mutations—and infectious diseases where viruses exploit these molecules for entry into host cells. The term "Cell-cell adhesion via immunoglobulin superfamily member" is not itself a canonical name but refers generically to any one of many possible proteins within this structurally related group.

Other names

Immunoglobulin superfamily memberIgSF cell adhesion moleculeImmunoglobulin-like cell adhesion moleculeNeural cell adhesion molecule (NCAM) [as a representative]Intercellular adhesion molecule (ICAM) [as a representative]Vascular cell adhesion molecule (VCAM) [as a representative]

Mechanisms depend on the specific family member. For example, monoclonal antibodies may block ligand binding or modulate immune checkpoint signaling for targets like CTLA‑4 or PD‑1. For neural CAMs, mechanisms include modulation of neurite outgrowth or synaptic plasticity.