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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cancer
2015 ; 6
(10
): 996-1004
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The Histone Deacetylase Inhibitor Vaproic Acid Induces Cell Growth Arrest in
Hepatocellular Carcinoma Cells via Suppressing Notch Signaling
#MMPMID26366213
Sun G
; Mackey LV
; Coy DH
; Yu CY
; Sun L
J Cancer
2015[]; 6
(10
): 996-1004
PMID26366213
show ga
Hepatocellular carcinoma (HCC) is a type of malignant cancer. Notch signaling is
aberrantly expressed in HCC tissues with more evidence showing that this
signaling plays a critical role in HCCs. In the present study, we investigate the
effects of the anti-convulsant drug valproic acid (VPA) in HCC cells and its
involvement in modulating Notch signaling. We found that VPA, acting as a histone
deacetylase (HDAC) inhibitor, induced a decrease in HDAC4 and an increase in
acetylated histone 4 (AcH4) and suppressed HCC cell growth. VPA also induced
down-regulation of Notch signaling via suppressing the expression of Notch1 and
its target gene HES1, with an increase of tumor suppressor p21 and p63.
Furthermore, Notch1 activation via overexpressing Notch1 active form ICN1 induced
HCC cell proliferation and anti-apoptosis, indicating Notch signaling played an
oncogenic role in HCC cells. Meanwhile, VPA could reverse Notch1-induced increase
of cell proliferation. Interestingly, VPA was also observed to stimulate the
expression of G protein-coupled somatostatin receptor type 2 (SSTR2) that has
been used in receptor-targeting therapies. This discovery supports a combination
therapy of VPA with the SSTR2-targeting agents. Our in vitro assay did show that
the combination of VPA and the peptide-drug conjugate camptothecin-somatostatin
(CPT-SST) displayed more potent anti-proliferative effects on HCC cells than did
each alone. VPA may be a potential drug candidate in the development of anti-HCC
drugs via targeting Notch signaling, especially in combination with
receptor-targeting cytotoxic agents.