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Hum Immunol. 2013 Jul;74(7):818-27. doi: 10.1016/j.humimm.2013.03.003. Epub 2013 Apr 10.

The expression and functional activity of membrane-bound human leukocyte antigen-G1 are influenced by the 3'-untranslated region.

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1
Department of Clinical Biochemistry, Centre for Immune Regulation and Reproductive Immunology, Copenhagen University Hospital (Roskilde), Roskilde, Denmark.

Abstract

Human Leukocyte Antigen (HLA)-G is an immunosuppressive molecule acting on both the innate and adaptive immune system. A 14 bp insertion/deletion polymorphism (rs66554220) in the 3'-untranslated region (3'UTR) of the HLA-G gene has been associated with a number of diseases, pregnancy complications, and graft rejection after organ transplantation. We have investigated the effect of HLA-G polymorphism in the 3'UTR on the processing and stability of the membrane-bound HLA-G1 (mHLA-G1) isoform, as well as its functional significance. Different HLA-G1 cDNA sequences were transduced into the human K562 cell line. Flow cytometry, immunohistochemistry, and ELISA were used to examine HLA-G1 protein expression. A quantitative RT-PCR assay was used to quantify transduced HLA-G1 DNA and mRNA transcript levels. Stability of mRNA and functional significance of HLA-G were investigated via Actinomycin D and NK cytotoxicity assays, respectively. Human leukocyte antigen-G mRNA from the 14 bp insertion K562-G1 cells showed a higher degree of stability than the other constructs, and increased mHLA-G1 expression relative to transductants lacking the 14 bp sequence. In line with this, transductants carrying the 14 bp insertion were the most efficient in inhibiting NK cytotoxicity but showed a lower soluble HLA-G1 per mHLA-G1 ratio than the HLA-G1 K562 cells lacking the 14 bp insertion. Our data suggest 3'UTR polymorphism may play an important role in HLA-G regulation with implications on a range of diseases.

PMID:
23583363
DOI:
10.1016/j.humimm.2013.03.003
[Indexed for MEDLINE]
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