Hierarchy in the assembly of HLA-B27 and HLA-Cw3 molecules in transgenic mice |
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Authors: | Susana Pedrinaci Julie Hanson Chella David |
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Institution: | (1) Department of Immunology, Mayo Graduate School of Medicine, 55905 Rochester, MN, USA;(2) Present address: Hospital Virgen Nieves, S. Analisis Clinicos Immunologia, 18014 Granada, Spain |
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Abstract: | Cell surface expression of human class I molecules in transgenic mice is dependent upon the available pool of 2-microglobulin ( 2m) and the affinity between mouse 2m and human class I molecules. HLA-B27 and HLA-Cw3 transgenes can be expressed in mouse strains of the H-2 haplotypes b,f,k, and s which encode two endogenous class I genes mapping to H-2K and H-2D. The human class I genes cannot be expressed on H-2
dand H-2
qhaplotypes which encode three endogenous class I molecules (K,D,L). This suggests that there may be only enough mouse 2m molecules to support three class I molecules. When both the HLA-B27 and HLA-Cw3 genes are introduced into H-2
bmice, only HLA-Cw3 reaches the cell surface. This suggests that HLA-Cw3 has a higher affinity than HLA-B27 for mouse 2m. The possible implications of our findings regarding the assembly, transport, and expression of class I MHC molecules in vivo are discussed. |
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