| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
* Turku Centre for Biotechnology,
Department of Biology,
Department of Anatomy, and
§ Department of Biochemistry and Pharmacy, Åbo Akademi University, University of Turku, FIN-20521 Turku, Finland
1Correspondence: Turku Centre for Biotechnology, BioCity, 5th Floor, Tykistökatu 6, FIN-20521 Turku, Finland. E-mail: lea.sistonen{at}btk.utu.fi
Differentiation of multipotential hematopoietic cells into lineage-committed precursors involves the selection and maintenance of appropriate programs of gene expression, regulated by specific transcription factors. Using human K562 erythroleukemia cells capable of differentiating along erythroid and megakaryocytic lineages, we explore the differentiation-related role of heat shock transcription factor 2 (HSF2), which belongs to a family of transcription factors generally known to regulate heat shock gene expression. We demonstrate that enhanced HSF2 expression and the acquisition of HSF2 DNA binding activity are strictly specific for erythroid characteristics of K562 cells. Our results reveal a multistep regulatory process of HSF2 gene expression. In K562 cells undergoing hemin-mediated erythroid differentiation, the increase in HSF2 protein levels is preceded by transcriptional induction of the HSF2 gene, accompanied by increased HSF2 mRNA stability. In contrast, during megakaryocytic differentiation induced by the phorbol ester TPA, expression of HSF2 is rapidly down-regulated, leading to a complete loss of the HSF2 protein. These results indicate that the determination of HSF2 expression occurs at the early stages of lineage commitment. Taken together, our data suggest that HSF2 could function as a lineage-restricted transcription factor during differentiation of K562 cells along either the erythroid or the megakaryocytic pathway.—Pirkkala, L., Alastalo, T.-P., Nykänen, P., Seppä, L., Sistonen, L. Differentiation lineage-specific expression of human heat shock transcription factor 2.
Key Words: HSF2 • K562 cells • erythroid differentiation • megakaryocytic differentiation
This article has been cited by other articles:
|
|
 |
|
  P. Ostling, J. K. Bjork, P. Roos-Mattjus, V. Mezger, and L. Sistonen Heat Shock Factor 2 (HSF2) Contributes to Inducible Expression of hsp Genes through Interplay with HSF1 J. Biol. Chem., March 9, 2007; 282(10): 7077 - 7086. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. Haussecker and N. J. Proudfoot Dicer-Dependent Turnover of Intergenic Transcripts from the Human {beta}-Globin Gene Cluster Mol. Cell. Biol., November 1, 2005; 25(21): 9724 - 9733. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T.-P. Alastalo, M. Hellesuo, A. Sandqvist, V. Hietakangas, M. Kallio, and L. Sistonen Formation of nuclear stress granules involves HSF2 and coincides with the nucleolar localization of Hsp70 J. Cell Sci., September 1, 2003; 116(17): 3557 - 3570. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Mathew, S. K. Mathur, C. Jolly, S. G. Fox, S. Kim, and R. I. Morimoto Stress-Specific Activation and Repression of Heat Shock Factors 1 and 2 Mol. Cell. Biol., November 1, 2001; 21(21): 7163 - 7171. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. PIRKKALA, P. NYKANEN, and L. SISTONEN Roles of the heat shock transcription factors in regulation of the heat shock response and beyond FASEB J, May 1, 2001; 15(7): 1118 - 1131. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Pirkkala, T.-P. Alastalo, X. Zuo, I. J. Benjamin, and L. Sistonen Disruption of Heat Shock Factor 1 Reveals an Essential Role in the Ubiquitin Proteolytic Pathway Mol. Cell. Biol., April 15, 2000; 20(8): 2670 - 2675. [Abstract] [Full Text]
|
|
|
|
 |
|
 C. Rabergh, S Airaksinen, A Soitamo, H. Bjorklund, T Johansson, M Nikinmaa, and L Sistonen Tissue-specific expression of zebrafish (Danio rerio) heat shock factor 1 mRNAs in response to heat stress J. Exp. Biol., January 6, 2000; 203(12): 1817 - 1824. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
