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Tytuł oryginału: GATA-1 binding to the ŕv promoter negatively regulates expression of the integrin ŕv subunit in human leukemic K562 cells.
Autorzy: Czyż Małgorzata, Stasiak Marta, Boncela Joanna, Cierniewski Czesław S.
Źródło: Acta Bioch. Pol. 2002: 49 (1) s.19-28, il., bibliogr. 30 poz.
Sygnatura GBL: 303,116

Hasła klasyfikacyjne GBL:
  • genetyka
  • hematologia
  • onkologia

    Typ dokumentu:
  • praca doświadczalna
  • tytuł obcojęzyczny

    Wskaźnik treści:
  • ludzie
  • in vitro

    Streszczenie angielskie: Recently we observed that the transcription factors Sp1 and Sp3 bind to the CTCCTCCTC sequence located between positions - 194 and - 172 of the ŕv promoter region and are directly involved in the regulation of transcriptional activity of teh ŕv 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 ŕv 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 ŕv 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 ŕv mRNA and ŕv protein onn the cell surface. Stimulation of K562 cells with PMA resulted in opposite effects: lower expression of GATA-1 was associated wtih increased leveld of ŕv. We conclude that the GATA-1 transcription factor specifically binds to the GATA element in the ŕv gene promoter and negatively regulates ŕv gene expression.

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