A potential role for protein kinase C-epsilon in regulating megakaryocytic lineage commitment
- Author(s)
- Racke, FK; Wang, DY; Zaidi, Z; Kelley, J; Visvader, J; Soh, JW; Goldfarb, AN;
- Details
- Publication Year 2001-01-05,Volume 276,Issue #1,Page 522-528
- Journal Title
- JOURNAL OF BIOLOGICAL CHEMISTRY
- Publication Type
- Journal Article
- Abstract
- Multiple studies have shown that intracellular signal transduction by the protein kinase C (PKC) family participates in the initiation of megakaryocyte differentiation. In this study, multiple approaches addressed the functional contributions by specific PKC isozymes to megakaryocytic lineage commitment of two independent cell lines, K562 and human erythroleukemia (HEL). Pharmacologic profiles of induction and inhibition of megakaryocytic differentiation in both cell lines suggested a role for the calcium-independent novel PKCs, in particular PKC-epsilon. In transfection studies, the isolated variable domain of PKC-epsilon selectively blocked exogenous activation of the megakaryocyte-specific alpha IIb promoter. Constitutively active mutants of PKC-epsilon, but not of other PKC isozymes, cooperated with the transcription factor GATA-1 in the activation of the alpha IIb promoter. The functional cooperation between GATA-1 and PKC-epsilon displayed dependence on cellular milieu, as well as on the promoter context of GATA binding sites. In aggregate, the data suggest that PKC-epsilon specifically participates in megakaryocytic lineage commitment through functional cooperation with GATA-1 in the activation of megakaryocytic promoters.
- Publisher
- AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
- Keywords
- TRANSCRIPTION FACTOR GATA-1; HEMATOPOIETIC PROGENITORS; GENE-EXPRESSION; K562 CELLS; DIFFERENTIATION; ACTIVATION; SIGNAL; PATHWAY; ALPHA; APOPTOSIS
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- Refer to copyright notice on published article.
Creation Date: 2001-01-05 12:00:00