Transactivation of classical and nonclassical HLA class I genes through the IFN-stimulated response element.
J Immunol
; 163(3): 1428-34, 1999 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-10415043
ABSTRACT
The IFN-stimulated response element (ISRE) is an important conserved cis-acting regulatory element in the promoter of MHC class I genes, but displays considerable locus-specific nucleotide variation. In this report, the putative ISREs of classical and nonclassical HLA class I genes were investigated for their contribution to MHC class I transactivation. It is shown that IFN-gamma induced MHC class I transactivation through the ISRE of HLA-A, HLA-B, HLA-C, and HLA-F. This is congruent with the binding of IFN regulatory factor-1 to the ISREs of these loci upon IFN-gamma treatment. Sp1 was shown to bind to the CG-rich sequences in the ISRE regions of HLA-B, HLA-C, and HLA-G. The putative E box 5' of the ISRE in most HLA-B alleles was shown to bind the upstream stimulatory factors (USF) 1 and 2. The Sp1 and USF binding sites did not influence IFN-gamma-induced transactivation. However, the USF binding site played a suppressive role in the constitutive expression of HLA-B. The locus-specific transcriptional control through the ISRE could be an important mechanism in the differential regulation of classical and nonclassical MHC class I expression, which determines adequate Ag presentation upon pathogenic challenge.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Genes MHC Classe I
/
Ativação Transcricional
/
Interferon gama
/
Elementos de Resposta
/
Proteínas de Ligação a DNA
Limite:
Humans
Idioma:
En
Ano de publicação:
1999
Tipo de documento:
Article