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2014 ; 15
(9
): 1198-207
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The interplay between histone deacetylases and c-Myc in the transcriptional
suppression of HPP1 in colon cancer
#MMPMID24919179
Wang J
; Elahi A
; Ajidahun A
; Clark W
; Hernandez J
; Achille A
; Hao JH
; Seto E
; Shibata D
Cancer Biol Ther
2014[Sep]; 15
(9
): 1198-207
PMID24919179
show ga
HPP1 (hyperplastic polyposis protein 1), a tumor suppressor gene, is
downregulated by promoter hypermethylation in a number of tumor types including
colon cancer. c-Myc is also known to play a role in the suppression of HPP1
expression via binding to a promoter region cognate E-box site. The contribution
of histone deacetylation as an additional epigenetic mechanism and its potential
interplay with c-Myc in the transcriptional regulation of HPP1 are unknown. We
have shown that the treatment of the HPP1-non-expressing colon cancer cell lines,
HCT116 and DLD-1 with HDAC inhibitors results in re-expression of HPP1.
RNAi-mediated knockdown of c-Myc as well as of HDAC2 and HDAC3 in HCT116 and of
HDAC1 and HDAC3 in DLD-1 also resulted in significant re-expression of HPP1.
Co-immunoprecipitation (IP), chromatin IP (ChIP), and sequential ChIP experiments
demonstrated binding of c-Myc to the HPP1 promoter with recruitment of and direct
interaction with HDAC3. In summary, we have demonstrated that c-Myc contributes
to the epigenetic regulation of HPP1 via the dominant recruitment of HDAC3. Our
findings may lead to a greater biologic understanding for the application of
targeted use of HDAC inhibitors for anti-cancer therapy.