title: Mechanism for the differentiation of EoL-1 cells into eosinophils by histone deacetylase inhibitors.
abstract: BACKGROUND
  EoL-1 cells have a FIP1L1-PDGFRA fusion gene which causes the transformation of eosinophilic precursor cells into leukemia cells. Recently, we suggested that the induction of differentiation of EoL-1 cells into eosinophils by the HDAC inhibitors apicidin and n-butyrate is due to the continuous inhibition of HDACs. However, neither apicidin nor n-butyrate inhibited the expression of FIP1L1-PDGFRA mRNA, although both these inhibitors suppressed cell proliferation. Therefore, in this study, we analyzed whether the levels of FIP1L1-PDGFRalpha protein and phosphorylated-Stat5 involved in the signaling for the proliferation of EoL-1 cells are attenuated by HDAC inhibitors.
  
  
  METHODS
  EoL-1 cells were incubated in the presence of apicidin, TSA or n-butyrate. FIP1L1-PDGFRalpha and phosphorylated-Stat5 were detected by Western blotting.
  
  
  RESULTS
  Treatment of EoL-1 cells with apicidin at 100 nM or n-butyrate at 500 microM decreased the levels of FIP1L1-PDGFRalpha protein and phosphorylated-Stat5, while that with trichostatin A at 30 nM did not.
  
  
  CONCLUSIONS
  The decrease in the level of FIP1L1-PDGFRalpha protein caused by apicidin and n-butyrate might be one of the mechanisms by which EoL-1 cells are induced to differentiate into eosinophils by these HDAC inhibitors.
authors.affiliation: Laboratory of Pathophysiological Biochemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
authors.forename: Motoko
authors.initials: M
authors.lastname: Kaneko
authors.forename: Kenji
authors.initials: K
authors.lastname: Ishihara
authors.forename: Aki
authors.initials: A
authors.lastname: Takahashi
authors.forename: Jangja
authors.initials: J
authors.lastname: Hong
authors.forename: Noriyasu
authors.initials: N
authors.lastname: Hirasawa
authors.forename: Okpyo
authors.initials: O
authors.lastname: Zee
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ohuchi
mesh_terms: D002087:Butyrates / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D045744:Cell Line, Tumor / Q000166:cytology / Q000187:drug effects; D004804:Eosinophils / Q000166:cytology*; D015973:Gene Expression Regulation, Leukemic / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors; D006801:Humans; D006877:Hydroxamic Acids / Q000494:pharmacology; D017681:Hypereosinophilic Syndrome / Q000235:genetics / Q000473:pathology*; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D015514:Oncogene Proteins, Fusion / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D010456:Peptides, Cyclic / Q000494:pharmacology*; D010766:Phosphorylation / Q000187:drug effects; D011499:Protein Processing, Post-Translational / Q000187:drug effects; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D020796:Receptor, Platelet-Derived Growth Factor alpha / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D050799:STAT5 Transcription Factor / Q000378:metabolism; D039221:mRNA Cleavage and Polyadenylation Factors / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*
chemical_list: D002087:Butyrates; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion; D010456:Peptides, Cyclic; D012333:RNA, Messenger; D050799:STAT5 Transcription Factor; C102351:apicidin; D039221:mRNA Cleavage and Polyadenylation Factors; C012589:trichostatin A; C479819:FIP1L1-PDGFRA fusion protein, human; D020796:Receptor, Platelet-Derived Growth Factor alpha