Lymphocyte cytosolic protein 2 (SLP-76) (SLP-76)

Lymphocyte cytosolic protein 2 (LCP2), commonly referred to as SLP-76 (SH2 domain-containing leukocyte protein of 76 kDa), is a critical adapter protein expressed in various hematopoietic cells, including T cells, mast cells, and platelets (UniProt P36243). It serves as a central scaffold in the T-cell receptor (TCR) signaling pathway, where it is phosphorylated by the kinase ZAP-70 following receptor activation (PubMed: 24161910). This phosphorylation allows SLP-76 to recruit and organize a multimolecular signaling complex including Vav1, Nck, and Gads, which are essential for activating phospholipase C-gamma-1 and downstream calcium signaling (PubMed: 10506104). In addition to its role in T cells, SLP-76 is vital for platelet activation through the GPVI collagen receptor and for mast cell degranulation via the FcεRI receptor (PubMed: 11114381). Genetic mutations in the LCP2 gene are associated with severe combined immunodeficiency (SCID) due to the failure of T-cell development in the thymus (PubMed: 9752310). While there are currently no FDA-approved drugs that directly target SLP-76, it remains a significant target for research in autoimmune diseases and T-cell malignancies, with experimental efforts focusing on small molecules that inhibit its SH2 domain (PubMed: 28213494).

Other names

SH2 domain-containing leukocyte protein of 76 kDaSH2 domain-containing leukocyte protein of 73 kDaLCP2SLP7676 kDa tyrosine phosphoprotein

Acts as a molecular scaffold to coordinate the assembly of signaling complexes downstream of immunoreceptors, facilitating the activation of phospholipase C-gamma-1 and actin cytoskeleton reorganization.