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CD6
CD6 Full Name
CD6 molecule
CD6 Introduction
CD6 is an immunoregulatory cell-surface protein encoded by the CD6 gene and belongs to the scavenger receptor cysteine-rich (SRCR) superfamily. It is predominantly expressed on mature T lymphocytes and thymocytes, with additional expression reported on selected B-cell and natural killer cell subsets. Structurally, CD6 contains three extracellular SRCR domains that enable specific ligand recognition, a single transmembrane region, and a cytoplasmic tail enriched in signaling motifs. Through these features, CD6 functions not only as a phenotypic marker of T cells but also as an interactive receptor that supports immune cell communication, particularly at sites where lymphocytes establish direct contact with antigen-presenting cells.
Figure 1. Schematic representation of CD6 interactions with its ligands.
From a functional perspective, CD6 acts as a fine-tuning regulator of T-cell responses rather than a simple on–off switch. Its engagement with ligands such as activated leukocyte cell adhesion molecule (ALCAM/CD166) helps stabilize the immunological synapse, thereby shaping the strength and duration of T-cell receptor signaling. Depending on cellular context and activation state, CD6 can amplify or restrain downstream signaling cascades that control T-cell proliferation, cytokine production, and differentiation. In addition to adaptive immunity, CD6 has been shown to interact with microbial components, suggesting a broader role in bridging innate and adaptive immune recognition and contributing to host defense mechanisms.
Alterations in CD6 expression or signaling are closely linked to immune-driven diseases, highlighting its relevance as both a biomarker and a therapeutic target. Genetic variants and dysregulated CD6 pathways have been associated with autoimmune disorders such as multiple sclerosis and other chronic inflammatory conditions, where aberrant T-cell activation and tissue infiltration drive pathology. CD6 is also being explored in oncology and transplant medicine, as modulation of CD6-mediated interactions can influence antitumor immunity and graft-versus-host responses. Owing to its cell-surface localization and functional importance, CD6 is widely studied using specialized research tools, including monoclonal antibodies, functional blocking reagents, and immunoassays, which support translational research and drug development efforts centered on immune modulation.
Alternate Names for CD6
CD6; CD6 molecule; TP120; T-cell differentiation antigen CD6; T12; CD6 antigen;
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