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2018 ; 119
(8
): 6623-6632
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Silence of HDAC6 suppressed esophageal squamous cell carcinoma proliferation and
migration by disrupting chaperone function of HSP90
#MMPMID29665050
Tao H
; Chen YY
; Sun ZW
; Chen HL
; Chen M
J Cell Biochem
2018[Aug]; 119
(8
): 6623-6632
PMID29665050
show ga
Esophageal carcinoma is aggressive in nature and its prognosis is largely
dependent on the degree of invasion. Histone deacetylase 6 (HDAC6), as the most
unique member of HDACs family, has the positive activity to promote initiation
and progression of various cancers via targeting multiple non-histone proteins in
cytoplasm. In this study, we found that HDAC6 was over-expressed in three
esophageal cancer cell lines (KYSE140, KYSE170, KYSE180) when compared to
non-carcinoma esophageal epithelial cell HEEC-1. Then two HDAC6 specific siRNAs
and HDAC6 inhibitor tubastatin A greatly suppressed KYSE140 and KYSE180 cells
proliferation and migration, and the inhibition of cell motility was accompanied
by elevated acetylation of ?-tubulin, a target of HDAC6. Consistently, the
microtubulin skeleton was stabilized after HDAC6 knockdown or inhibition. In
addition, acetylation status of HSP90, another HDAC6 target, was also increased
towards HDAC6 knockdown or inhibition by co-immunoprecipitation assay. Besides,
co-treatment of HSP90 inhibitor (PU-H71) and HDAC6 inhibitor (tubastatin A)
induced a stronger cell migration inhibition compared to administration of either
drug alone. Furthermore, cell proliferation of KYSE140 and KYSE180 were also
compromised in response to combination of HDAC6 and HSP90 inhibitors.
Additionally, co-administration of HSP90 inhibitor and HDAC6 inhibitor strongly
inhibited tumor growth in vivo. Taken together, our results indicated that HDAC6
is a promising target by inhibiting HSP90 function in ESCC.