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Elsevier, Biochemical and Biophysical Research Communications, 3(411), p. 632-636, 2011

DOI: 10.1016/j.bbrc.2011.07.007

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Human MR1 expression on the cell surface is acid sensitive, proteasome independent and increases after culturing at 26 °C

Journal article published in 2011 by Beatriz Abós, Manuel Gómez del Moral, Beatriz Gozalbo-López, Juan López-Relaño, Vanesa Viana ORCID, Eduardo Martínez-Naves
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Mucosal-associated invariant T (MAIT) cells are a population of non-conventional T-lymphocytes which are restricted by the MHC-related 1 (MR1) molecule. MR1 is a non-classical member of the MHC class I family of proteins, it is unknown if MR1 presents any kind of antigens to MAIT cells. In the present manuscript we describe that detection of MR1 on the cell surface by conformation-dependent monoclonal antibodies is enhanced upon culture the cells at 26°C; we also show that detection of MR1 on the cell surface is lost after treating the cells at pH 3.3 as in the case of classical MHC class I molecules. Finally, the re-expression of MR1 on the cell surface is independent of proteasome. Taken together these results strongly suggest that MR1 needs to bind proteasome-independent ligands in order to properly reach the cell surface.