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Ecto-F1-ATPase and MHC-class I close association on cell membranes.

Abstract：

:Subunits of the mitochondrial ATP synthase complex are expressed on the surface of tumors, bind the TCR of human Vgamma9/Vdelta2 lymphocytes and promote their cytotoxicity. Present experiments show that detection of the complex (called ecto-F1-ATPase) at the cell surface by immunofluorescence correlates with low MHC-class I antigen expression. Strikingly, the alpha and beta chains of ecto-F1-ATPase are detected in membrane protein precipitates from immunofluorescence-negative cells, suggesting that ATPase epitopes are masked. Removal of beta2-microglobulin by mild acid treatment so that most surface MHC-I molecules become free heavy chains reveals F1-ATPase epitopes on MHC-I+ cell lines. Ecto-F1-ATPase is detected by immunofluorescence on primary fibroblasts which express moderate levels of MHC-I antigens. Up-regulation of MHC-I on these cells following IFN-gamma and/or TNF-alpha treatment induces a dose-dependent disappearance of F1-ATPase epitopes. Finally, biotinylated F1-ATPase cell surface components co-immunoprecipitate with MHC-I molecules confirming the association of both complexes on Raji cells. Confocal microscopy analysis of MHC-I and ecto-F1-ATPase beta chain expression on HepG2 cells shows a co-localization of both complexes in punctate membrane domains. This demonstrates that the TCR target F1-ATPase is in close contact with MHC-I antigens which are known to control Vgamma9/Vdelta2 T cell activity through binding to natural killer inhibitory receptors.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Vantourout P,Martinez LO,Fabre A,Collet X,Champagne E

doi

10.1016/j.molimm.2007.05.026

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

485-92

issue

2

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(07)00247-7

journal_volume

45

pub_type

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