CD244 is expressed on dendritic cells and regulates their functions

Area of Science:

• Immunology
• Cell Biology

Background:

• Signaling lymphocytic activation molecule (SLAM) receptors are crucial for immune responses, influencing NK cell cytotoxicity and cytokine production.
• The SLAM receptor CD244 (2B4, SLAMf4) is expressed on various immune cells, with its functions primarily studied in NK and T cells.

Purpose of the Study:

• To investigate the expression and function of CD244 in murine dendritic cell (DC) subsets.
• To determine the role of CD244 in DC maturation, cytokine production, and interaction with NK cells.

Main Methods:

• Analysis of CD244 expression across different murine DC subsets.
• Comparison of CD86 and MHC class II expression on DCs from CD244(-/-) and wild-type mice.
• Assessment of cytokine production by DCs upon Toll-like receptor (TLR) stimulation.
• Evaluation of NK cell activation by DCs in vitro.

Main Results:

• All examined murine DC subsets express CD244, with varying expression levels.
• DCs from CD244(-/-) mice showed reduced CD86 and MHC class II expression.
• Absence of CD244 led to significantly higher pro-inflammatory cytokine production by splenic DCs upon TLR stimulation (LPS and CpG).
• DCs from CD244(-/-) mice induced increased NK cell activation in vitro.

Conclusions:

• CD244 is expressed on all murine DC subsets and modulates their function.
• CD244 deficiency in DCs results in enhanced pro-inflammatory responses and increased NK cell activation.
• CD244 is identified as an immuno-modulatory receptor on dendritic cells.