Tang Q, Zhang J, Qi B, Shen C, Xie W. Downregulation of HLA class I molecules in primary oral squamous cell carcinomas and cell lines.
Arch Med Res 2009;
40:256-63. [PMID:
19608014 DOI:
10.1016/j.arcmed.2009.04.004]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2008] [Accepted: 03/30/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND AND AIMS
Loss or downregulation of human leukocyte antigen (HLA) class I expression has been reported in a variety of human tumors including oral squamous cell carcinoma (OSCC).
METHODS
Expression of HLA class I molecules were evaluated by immunohistochemistry, flow cytometry, semi-quantitative Western blot and RT-PCR in 43 tissue samples of primary oral squamous cell carcinomas (pOSCC) from Chinese patients and two OSCC cell lines.
RESULTS
HLA class I heavy chain of B/C locus and A locus and beta(2-)microglobulin were obviously lost or downregulated in pOSCC with the percentage of 31, 55 and 35% respectively. The expression of HLA B/C, LMP2, LMP7, LMP10 and PA28beta in OSCC cell lines was also presumably reduced in comparison with normal epithelial cell line.
CONCLUSIONS
These data suggested that the downregulation of HLA class I molecules in OSCC was closely associated with the low-efficient transcription and abnormality of post-transcription regulation of HLA class I genes and antigen presentation-related genes. These results can add more light to the mechanism by which OSCC escape from immunological surveillance.
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