TY - JOUR
T1 - Defective major histocompatibility complex class i expression in a sarcomatoid renal cell carcinoma cell line
AU - Jakobsen, Michael K.
AU - Restifo, Nicholas P.
AU - Cohen, Peter A.
AU - Marincola, Francesco M.
AU - Bryan Cheshire, L.
AU - Marston Linehan, W.
AU - Rosenberg, Steven A.
AU - Alexander, Richard B.
PY - 1995/5
Y1 - 1995/5
N2 - We studied major histocompatibility complex (MHC) class I expression in 12 tumor cell culture lines established from patients with metastatic renal cell carcinoma (RCC). In one of these cell culture lines, UOK 123, we found no surface expression of β2-microglobulin (β2m) and MHC class I by flow cytometry. Immunofluorescence staining using three different monoclonal antibodies to p2m revealed no detectable β2β2endoplasmic reticulum (ER), Golgi apparatus, cytoplasm, or on the cell surface. There was no evidence of folded class I molecules inside or on the surface of the cells; however, the ER stained intensively for unfolded class I molecules. Transient expression of (32m by UOK 123 after infection with a recombinant vaccinia virus containing the gene for β2m resulted in normal expression of both β2m and class I (HLA-A, B, C) determinants assessed by flow cytometry analysis. No expression of class I or β2m was seen with the recombinant vaccinia vector carrying a control gene. The inability of class I molecules to reach the cell surface is due to the requirement of β2m for proper folding and presentation of the class I MHC complex. The failure to assemble and express MHC class I complex on the cell surface renders these cells incapable of antigen presentation to cytotoxic T cells and provides a mechanism for escape from immune recognition by the tumor.
AB - We studied major histocompatibility complex (MHC) class I expression in 12 tumor cell culture lines established from patients with metastatic renal cell carcinoma (RCC). In one of these cell culture lines, UOK 123, we found no surface expression of β2-microglobulin (β2m) and MHC class I by flow cytometry. Immunofluorescence staining using three different monoclonal antibodies to p2m revealed no detectable β2β2endoplasmic reticulum (ER), Golgi apparatus, cytoplasm, or on the cell surface. There was no evidence of folded class I molecules inside or on the surface of the cells; however, the ER stained intensively for unfolded class I molecules. Transient expression of (32m by UOK 123 after infection with a recombinant vaccinia virus containing the gene for β2m resulted in normal expression of both β2m and class I (HLA-A, B, C) determinants assessed by flow cytometry analysis. No expression of class I or β2m was seen with the recombinant vaccinia vector carrying a control gene. The inability of class I molecules to reach the cell surface is due to the requirement of β2m for proper folding and presentation of the class I MHC complex. The failure to assemble and express MHC class I complex on the cell surface renders these cells incapable of antigen presentation to cytotoxic T cells and provides a mechanism for escape from immune recognition by the tumor.
KW - MHC class I
KW - Renal cell carcinoma
KW - β-microglobulin
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U2 - 10.1097/00002371-199505000-00004
DO - 10.1097/00002371-199505000-00004
M3 - Article
C2 - 7582258
AN - SCOPUS:0029123613
SN - 1524-9557
VL - 17
SP - 222
EP - 228
JO - Journal of Immunotherapy
JF - Journal of Immunotherapy
IS - 4
ER -