Abstract
We developed a novel human leukocyte antigen HLA–ABC locus-specific quantitative real-time polymerase chain reaction (PCR) to determine the locus-specific gene expression of HLA–ABC in peripheral blood leukocytes (PBLs, n = 53), colon mucosa (n = 15), and larynx mucosa (n = 15). Laser-assisted tissue microdissection allowed us to study the selected cells without interference from surrounding stroma. We report evidence on the specificity of the technique, describing the HLA–ABC locus-specific gene expression patterns found in the PBLs and two solid tissues studied. PBLs showed a higher gene expression of HLA-B than of HLA-A or HLA-C (p = 4.7 × 10−10 and p = 1.6 × 10−6, respectively). In solid tissue, HLA-A and HLA-B gene expressions were similar and HLA-C expression lower. In particular, in larynx mucosa, significant differences were found between HLA-A and HLA-C expressions and between HLA-B and HLA-C expressions (p = 6.5 × 10−4 and p = 8.1 × 10−4, respectively). The same differences were observed in colon mucosa, but significance was not reached (p = 0.08 and p = 0.06, respectively). Differences in locus-specific regulation may be related to the control of cytotoxic responses of NK and CD8 positive T cells. Gene expression of HLA–ABC specific locus showed no intra-individual variability, but there was a high inter-individual variability. This may result from differences in the expression of common regulatory factors that control HLA–ABC constitutive expression.
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Acknowledgments
The authors thank Ana Isabel Rodríguez Fernández for technical assistance. The study was partially supported by grants from the Fondo de Investigaciones Sanitarias (08/1265), Red Genómica del Cáncer (RETICRD 06/020), Consejería de Salud Junta de Andalucía, Proyecto de Investigación de Excelencia (CTS-3952 and CVI-4740) and Plan Andaluz de Investigación (PAI, Group CTS-143) in Spain, and from the European Searchable Tumour Cell Line Database (ESTDAB) project, contract No. QLRI-CT-2001-01325 (http://www.ebi.ac.uk/estdab), from the European Network for the identification and validation of antigens and biomarkers in cancer and their application in clinical tumor immunology (ENACT) project (European community LSHC-CT-2004-503306) and from the Cancer Immunotherapy project (European community OJ 2004/c158,18234)
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García-Ruano, A.B., Méndez, R., Romero, J.M. et al. Analysis of HLA–ABC locus-specific transcription in normal tissues. Immunogenetics 62, 711–719 (2010). https://doi.org/10.1007/s00251-010-0470-z
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DOI: https://doi.org/10.1007/s00251-010-0470-z