Roles of CD48 in regulating immunity and tolerance

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• CD48, a member of the signaling lymphocyte activation molecule (SLAM) family, is expressed on most hematopoietic cells and upregulated upon activation.
• It plays roles in immune cell adhesion and activation through interactions with CD2, FimH, and its high-affinity ligand CD244.
• CD48 exhibits both stimulatory and inhibitory functions, particularly in regulating natural killer (NK) cell and cytotoxic T lymphocyte (CTL) activity.

Purpose of the Study:

• To review the diverse roles of CD48 in immune responses, including infection, tolerance, autoimmunity, and allergy.
• To discuss the complex stimulatory and regulatory functions of CD48.
• To highlight CD48 as a potential therapeutic target for human diseases and address challenges in its investigation.

Main Methods:

• Literature review of existing research on CD48.
• Analysis of studies investigating CD48's interactions with ligands like CD2, FimH, and CD244.
• Examination of experimental tools used to study CD48 function.

Main Results:

• CD48 has multifaceted roles in immune cell activation, adhesion, and regulation.
• CD48-CD244 interactions are critical for NK cell and CTL-mediated cytotoxicity and T cell memory.
• CD48's involvement spans various immunological contexts, from viral infections to autoimmune and allergic conditions.

Conclusions:

• CD48 is a key immunoregulatory receptor with significant implications in health and disease.
• Understanding CD48's complex functions is crucial for developing targeted immunotherapies.
• Further research is needed to overcome challenges in studying and therapeutically targeting CD48.