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Published on: March 5, 2019
Basic science for the clinician 54: CD5
1Division of Rheumatology and Connective Tissue Research, Department of Medicine, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA. lensigal@gmail.com.
Summary
CD5, a cell surface marker, plays a crucial role in regulating immune responses. Recent research indicates CD5 fine-tunes B and T cell signaling, potentially controlling autoimmunity rather than causing it.
Area of Science:
- Immunology
- Cell Biology
Background:
- CD5 is a cell surface marker found on T cells, thymocytes, and a subset of B cells.
- Its precise role in immune responses has been debated, with evolving understanding.
Purpose of the Study:
- To clarify the function of CD5 in immune responses.
- To investigate the role of CD5 in B cell function, autoimmunity, and T cell lymphomas.
Main Methods:
- Review of recent studies on CD5 function.
- Analysis of CD5 expression in relation to B cell signaling and autoimmunity.
Main Results:
- CD5 appears to fine-tune or suppress signaling through antigen receptors on B and T cells.
- CD5 B cells produce natural antibodies but are not the primary source of autoantibodies.
- CD5 may negatively regulate B cell function, potentially controlling autoimmunity.
- Elevated CD5 levels are associated with autoimmune disorders and T cell lymphomas.
Conclusions:
- CD5 plays a significant role in regulating immune responses, particularly B cell function.
- Evidence suggests CD5 acts to control autoimmunity and may be involved in lymphoid malignancies.
- Further research into CD5 mechanisms could lead to clinical and therapeutic applications.
