Effect of invariant chain on major histocompatibility complex class I molecule expression and stability on human breast tumor cell lines.
Invariant chain (Ii) binds to the human leukocyte antigen (HLA) class II molecule and assists it in the process of peptide acquisition. In addition, Ii binds to the HLA class I molecule, although there has been little study of its effects on the HLA class I molecule. In addition to its normal expression on antigen-presenting cells, Ii expression is up regulated in a variety of tumors. By flow cytometric analysis, we found that expression of Ii resulted in an increase in the number of cell surface HLA class I molecules and in the proportion of unstable HLA class I molecules at the surface of breast tumor cell lines. These data suggest that the expression of Ii by tumor cells may quantitatively and qualitatively alter the presentation of antigens on those cells.
Lin
Xuede
X
Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA.
Wang
Xiaojian
X
Capek
Haley L
HL
Simone
Laura C
LC
Tuli
Amit
A
Morris
Chantey R
CR
Reber
Adrian J
AJ
Solheim
Joyce C
JC
D000230:Adenocarcinoma / Q000276:immunology / Q000473:pathology; D017951:Antigen Presentation; D000944:Antigens, Differentiation, B-Lymphocyte / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000276:immunology*; D001943:Breast Neoplasms / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D006528:Carcinoma, Hepatocellular / Q000276:immunology / Q000473:pathology; D045744:Cell Line, Tumor / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic; D005805:Genes, MHC Class I; D006680:HLA Antigens / Q000276:immunology*; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D008113:Liver Neoplasms / Q000276:immunology / Q000473:pathology / Q000556:secondary; D008297:Male; D010190:Pancreatic Neoplasms / Q000276:immunology / Q000473:pathology; D010446:Peptide Fragments / Q000276:immunology; D011471:Prostatic Neoplasms / Q000276:immunology / Q000473:pathology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D013696:Temperature
D000944:Antigens, Differentiation, B-Lymphocyte; D000951:Antigens, Neoplasm; D006680:HLA Antigens; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D010446:Peptide Fragments; C045084:invariant chain