Basic fibroblast growth factor inhibits p38-mediated cell differentiation and growth inhibition by activin A but not by histone deacetylase inhibitors in CML cells

Chun Hsin Chen, John Yi Chung Lin, Fu Hwa Liu, Ju Ling Chang, Huei Mei Huang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The p38 mitogen-activated protein kinase (p38) is involved in multiple cellular functions such as cell proliferation and differentiation. Previously, we found that activin A mediated hemoglobin synthesis and cell growth inhibition through p38, whereas, basic fibroblast growth factor (bFGF) inactivated p38 to antagonize the activin A effects. In this study, we selected three structurally different histone deacetylase (HDAC) inhibitors, apicidin, MS275, and sodium butyrate that activate p38, to probe the signal pathway from activin A to p38 in chronic myeloid leukemia (CML)-derived K562 cells. HDAC inhibitors and activin A showed additive p38 phosphorylation. The enhanced phosphorylation of p38 was correlated with increased cell differentiation and decreased cell proliferation. The use of p38 inhibitor SB203580 in conjunction with activin A or with the HDAC inhibitors inhibited cell differentiation and restored cell proliferation, indicating that activin A and the HDAC inhibitors exert their effects through p38 activation. However, bFGF did not affect HDAC inhibitors-induced cell differentiation or growth inhibition. Western blots showed that p38 phosphorylation remained at similar levels with or without bFGF in the presence of HDAC inhibitors. Thus, the HDAC inhibitors activate p38 in a manner different from the activin A pathway. Furthermore, mRNA expressions for activin type I, IB, II, and IIB receptors remained constant in the presence of activin A, bFGF, or both activin A and bFGF. These results indicate that bFGF does not directly act on p38 nor on the mRNA expression levels of activin receptors but inhibit activin A activation of p38 upstream of p38 in K562 cells.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalAnnals of Hematology
Volume87
Issue number3
DOIs
Publication statusPublished - Mar 2008

Keywords

  • Activin A
  • Cell differentiation
  • Cell proliferation
  • Histonedeacetylase inhibitor
  • bFGF
  • p38

ASJC Scopus subject areas

  • Hematology

Fingerprint

Dive into the research topics of 'Basic fibroblast growth factor inhibits p38-mediated cell differentiation and growth inhibition by activin A but not by histone deacetylase inhibitors in CML cells'. Together they form a unique fingerprint.

Cite this