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A Method For Production of Recombinant mCD1d Protein in Insect Cells.
Published on: December 10, 2007
Cutting edge: a naturally occurring mutation in CD1e impairs lipid antigen presentation
Sylvie Tourne1, Blandine Maitre, Anthony Collmann
1Unité 725 Biology of Human Dendritic Cells, Institut National de la Santé et de la Recherche Médicale (INSERM), Strasbourg, France. sylvie.tourne@efs-alsace.fr
Journal of Immunology (Baltimore, Md. : 1950)
|March 8, 2008
Summary
A specific variant of CD1e protein (allele 4) impairs the presentation of complex glycolipid antigens, like PIM(6), to T cells due to improper cellular transport. This may alter immune responses in homozygous individuals.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- CD1 proteins present lipid antigens to T cells.
- CD1a-d are cell surface molecules, while CD1e is intracellular.
- CD1e processes complex glycolipids like hexamannosylated phosphatidyl-myo-inositol (PIM(6)).
Purpose of the Study:
- To investigate the function of a specific CD1e variant (allele 4) in antigen presentation.
- To determine the impact of CD1e polymorphism on T cell recognition of glycolipids.
- To elucidate the molecular mechanisms underlying CD1e variant incompetence.
Main Methods:
- Analysis of CD1e protein variants.
- Assessment of PIM(6) antigen presentation to T cells.
- Investigation of protein assembly and intracellular trafficking.
Main Results:
- A CD1e variant with proline at position 194 (allele 4) failed to present PIM(6) to CD1b-restricted T cells.
- This variant exhibited inefficient assembly and impaired transport to late endosomes.
- The frequency of CD1E allele 4 is low in the general population.
Conclusions:
- The CD1e allele 4 variant is immunologically incompetent for PIM(6) presentation.
- Defective intracellular processing and transport underlie the variant's functional deficiency.
- Homozygosity for CD1e allele 4 may lead to altered immune responses against complex glycolipids.
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