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2002 | 49 | 1 |

Tytuł artykułu

GATA-1 binding to the alphaV promoter negatively regulates expression of the integrin alphaV subunit in human leukemic K562 cells

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Recently we observed that the transcription factors Sp1 and Sp3 bind to the CTCCTCCTC sequence located between positions -194 and -172 of the αv promoter region and are directly involved in the regulation of transcriptional activity of the αv gene in human umbilical vascular endothelial cells (HUVECs) (Czyz & Cierniewski, 1999, Eur. J. Biochem. 265, 638). In this report we provide evidence that the GATA-1 factor regulates αv expression during differentiation of pluripotent K562 cells in­duced either by phorbol 12-myristate 13-acetate (PMA) or butyric acid (BA) through interaction with the GATA element in the «v gene promoter. DNase I footprinting analysis revealed that region -413 to -408, covering the GATA binding site, was pro­tected by nuclear extract from K562 cells. There was no protection of this region by HUVEC nuclear extract. Electrophoretic mobility shift assay (EMSA) analysis of nu­clear extract of K562 cells treated with BA revealed an increase in GATA binding ac­tivity, which was associated with reduced αv mRNA and αv protein on the cell surface. Stimulation of K562 cells with PMA resulted in opposite effects: lower expression of GATA-1 was associated with increased levels of αv. We conclude that the GATA-1 tran­scription factor specifically binds to the GATA element in the αv gene promoter and negatively regulates αv gene expression.

Wydawca

-

Rocznik

Tom

49

Numer

1

Opis fizyczny

p.19-28,fig.

Twórcy

autor
  • Medical University of Lodz, W.Lindleya 6, 90-131 Lodz, Poland
autor
autor

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

bwmeta1.element.agro-article-0fc3c348-080a-47c7-bdce-d176658e98d2
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