Neural cell adhesion molecule L1-like protein (CHL1)

Neural cell adhesion molecule L1-like protein (CHL1) is a transmembrane cell adhesion molecule belonging to the L1CAM family, containing multiple immunoglobulin-like and fibronectin type III domains in its extracellular region[1][5][7]. It is expressed in neurons, glia, and Schwann cells, and is crucial for the formation, refinement, and function of neuronal circuitry, influencing neuronal differentiation, neurite outgrowth, and axon guidance during development[3][5]. In addition to its neural roles, CHL1 regulates cell proliferation, migration, and metastasis in various cancers, including glioma and colorectal cancer, where altered expression can either inhibit or promote tumor progression depending on context[4][8]. CHL1 is also implicated in neurodevelopmental disorders—its loss is associated with abnormal axonal projections and cognitive deficits, such as those seen in 3p- syndrome[5]. CHL1 mediates both homophilic (CHL1-CHL1) and heterophilic (with integrins, NB-3, semaphorin 3A, and others) cell interactions, and proteolytic processing by BACE1 or ADAM8 releases fragments involved in neuronal survival and regeneration[3][5]. CHL1’s roles in non-neural tissues, like the carotid body, have been linked to physiological responses to hypoxia[7]. No direct drugs or targeted therapies are currently described for CHL1, but it is considered a potential therapeutic target and biomarker in certain cancers, especially gliomas[4][8]. The main challenges for CHL1 as a therapeutic target include the risk of disrupting normal neural connectivity or cell adhesion, which could result in neurological or proliferative side effects.

Other names

Close homolog of L1CALLL1CAM2Processed neural cell adhesion molecule L1-like proteinFLJ44930MGC132578cell adhesion molecule with homology to L1CAMNCHL1_HUMAN