Depudecin induces morphological reversion of transformed fibroblasts via the inhibition of histone deacetylase

Ho Jeong Kwon, Takashi Owa, Christian A. Hassig, Junichi Shimada, Stuart L. Schreiber

Research output: Contribution to journalArticlepeer-review

197 Citations (Scopus)


Depudecin is a fungal metabolite that reverts the rounded phenotype of NIH 3T3 fibroblasts transformed with v-ras and v-src oncogenes to the flattened phenotype of the nontransformed parental cells. The mechanism of detransformation induced by this agent had not been determined. Here, we demonstrate that depudecin inhibits histone deacetylase (HDAC) activity effectively both in vivo and in vitro. Depudecin induces similar morphological reversion in v-ras transformed NIH 3T3 cells as do other naturally occurring HDAC inhibitors such as trichostatin A or trapoxin. It competitively inhibits the binding of [3H] trapoxin in vitro and the nuclear binding of a trapoxin-coumarin fluorophore in vivo, suggesting that depudecin shares a nuclear binding protein and site on that protein with trapoxin. Furthermore, depudecin induces hyperacetylation of histones in a dose- dependent manner and at concentrations comparable with that required for detransformation. An in vitro histone deacetylase assay, using purified recombinant HDAC1, reveals that depudecin inhibits 50% of the enzyme activity at a concentration of 4.7 μM. These results demonstrate that depudecin is a novel HDAC inhibitor and suggest that its ability to induce morphological reversion of transformed cells is the result of its HDAC inhibitory activity.

Original languageEnglish
Pages (from-to)3356-3361
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number7
Publication statusPublished - 1998 Mar 31

All Science Journal Classification (ASJC) codes

  • General


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