Abstract:
:The nonclassical MHC class I HLA-G antigen is expressed in cytotrophoblasts during pregnancy and may play a role in inhibiting lysis by maternal natural killer cells. HLA-G gene transcription was analyzed in human fetal liver of 6-8 wk of gestation, a development stage where classical HLA class I expression is very reduced. We demonstrated that HLA-G transcription is undetectable in these cells and we investigated the molecular mechanisms that control the lack of HLA-G gene transcription. We compared protein interactions of nuclear extracts from first trimester fetal livers, YT2C2-PR (HLA-G negative) and JEG-3 (HLA-G positive) cell lines to a 244-bp EcoR I/Hind III DNA region located 1.2 kb from the HLA-G gene, previously shown to direct HLA-G expression in transgenic mouse placenta. A strong specific C7-factor was specifically detected in first trimester fetal liver that could account for the inhibition of HLA-G transcription. Interaction of C7-factor and cell-specific factors previously detected in YT2C2 cell line (C5, C6) with two distinct regulatory regions identify this 244-bp EcoR I/Hind III fragment as a putative target for inhibition of HLA-G transcription.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Moreau P,Lefebvre S,Gourand L,Dausset J,Carosella ED,Paul Pdoi
10.1016/s0198-8859(98)00081-0subject
Has Abstractpub_date
1998-12-01 00:00:00pages
751-7issue
12eissn
0198-8859issn
1879-1166pii
S0198-8859(98)00081-0journal_volume
59pub_type
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