Publication Date:
2003-12-20
Description:
It is now established that CD1 molecules present lipid antigens to T cells, although it is not clear how the exchange of lipids between membrane compartments and the CD1 binding groove is assisted. We report that mice deficient in prosaposin, the precursor to a family of endosomal lipid transfer proteins (LTP), exhibit specific defects in CD1d-mediated antigen presentation and lack Valpha14 NKT cells. In vitro, saposins extracted monomeric lipids from membranes and from CD1, thereby promoting the loading as well as the editing of lipids on CD1. Transient complexes between CD1, lipid, and LTP suggested a "tug-of-war" model in which lipid exchange between CD1 and LTP is on the basis of their respective affinities for lipids. LTPs constitute a previously unknown link between lipid metabolism and immunity and are likely to exert a profound influence on the repertoire of self, tumor, and microbial lipid antigens.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2918537/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2918537/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Dapeng -- Cantu, Carlos 3rd -- Sagiv, Yuval -- Schrantz, Nicolas -- Kulkarni, Ashok B -- Qi, Xiaoyang -- Mahuran, Don J -- Morales, Carlos R -- Grabowski, Gregory A -- Benlagha, Kamel -- Savage, Paul -- Bendelac, Albert -- Teyton, Luc -- 10435/Canadian Institutes of Health Research/Canada -- AI38339/AI/NIAID NIH HHS/ -- AI50867/AI/NIAID NIH HHS/ -- P01 AI53725/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):523-7. Epub 2003 Dec 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14684827" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
*Antigen Presentation
;
Antigen-Presenting Cells/immunology/metabolism
;
Antigens, CD1/*immunology/metabolism
;
Antigens, CD1d
;
Carrier Proteins/*metabolism
;
Endosomes/*metabolism
;
G(M2) Activator Protein
;
Glycolipids/immunology
;
Glycoproteins/deficiency/genetics/metabolism/*physiology
;
Killer Cells, Natural/immunology
;
Lipid Metabolism
;
Lipids/*immunology
;
Mice
;
Proteins/metabolism
;
Receptors, Antigen, T-Cell/immunology
;
Saposins
;
Sphingolipid Activator Proteins
;
T-Lymphocytes/*immunology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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