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Related Experiment Video

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Integrate Imaging Flow Cytometry and Transcriptomic Profiling to Evaluate Altered Endocytic CD1d Trafficking

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CD1a selectively captures endogenous cellular lipids that broadly block T cell response.

Rachel N Cotton^1,2, Marcin Wegrecki^3,4, Tan-Yun Cheng²

¹Graduate Program in Immunology, Harvard Medical School, Boston, MA.

The Journal of Experimental Medicine

|May 7, 2021

Summary

Cellular CD1a proteins preferentially bind specific sphingolipids, with a C42 sphingomyelin acting as a natural inhibitor. This finding reveals intrinsic autoreactivity in the CD1a system, crucial for understanding T cell responses.

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Area of Science:

Immunology
Biochemistry
Structural Biology

Background:

Cellular CD1a proteins present endogenous lipids to T cells, influencing immune responses.
Current models primarily focus on antigen-driven T cell activation, with less emphasis on endogenous lipid regulation.

Purpose of the Study:

To optimize lipidomics methods for detecting endogenous lipids bound to CD1a.
To identify specific endogenous lipids that interact with and modulate CD1a function.
To elucidate the structural basis for CD1a-lipid interactions and their impact on T cell receptor (TCR) binding.

Main Methods:

Optimization of lipidomics techniques for broad endogenous lipid detection.
Analysis of lipids captured by cellular CD1a proteins.
T cell binding assays using CD1a tetramers.
X-ray crystallography to determine the structure of CD1a-lipid complexes.

Main Results:

CD1a preferentially captures sphingolipids, particularly a C42 doubly unsaturated sphingomyelin (42:2 SM), over common membrane phospholipids.
The natural 42:2 SM, but not the more common 34:1 SM, effectively blocked CD1a tetramer binding to T cells.
Crystal structures revealed that shorter sphingomyelins stabilize CD1a surface residues, while longer ones hinder TCR approach by altering the phosphocholine group's position.

Conclusions:

Cellular CD1a selectively captures specific endogenous lipids that act as broad inhibitors of TCR binding.
The CD1a system possesses intrinsic autoreactivity, negatively regulated by these natural endogenous inhibitors.
Understanding the chemical structures of these natural blockers could inform the design of novel therapeutics targeting CD1a-mediated responses.