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Drug Target Encyclopedia Series (5) — CD5
Release Time：
2025-12-05 10:23
Cluster of Differentiation 5 (CD5) is a transmembrane glycoprotein primarily expressed on T cells and a subset of B cells. As an immunomodulatory receptor, CD5 plays a dual role in regulating immune responses—fine-tuning T-cell receptor (TCR) signaling and contributing to immune tolerance.
CD5 functions as a negative regulator of antigen-specific receptor-mediated activation, particularly in T cells, helping to prevent excessive immune responses and autoimmunity. Emerging evidence also suggests its involvement in modulating B cell tolerance and influencing autoimmune disease development.
CD5 has gained traction as a potential therapeutic target in both autoimmunity and cancer. In autoimmune disorders like rheumatoid arthritis and multiple sclerosis, CD5 modulation could help rebalance hyperactive immune signaling. Conversely, in certain malignancies such as chronic lymphocytic leukemia (CLL) and T-cell lymphomas, CD5 is often overexpressed and may contribute to immune evasion or tumor cell survival.
Therapeutic strategies under investigation include:
- CD5-targeted monoclonal antibodies – for depleting pathogenic T or B cells in lymphoid malignancies.
- CD5 modulation in autoimmune disease – to dampen autoreactive immune responses.
- CD5-based CAR-T and bispecific formats – being explored in hematologic cancers.
As interest grows in next-generation immunotherapies, CD5 represents a promising immune regulatory checkpoint to watch—especially for conditions where traditional PD-1/PD-L1 blockade is ineffective or unsuitable.
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