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2015 ; 10
(4
): 1602-1608
Nephropedia Template TP
gab.com Text
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Scutellaria barbata D Don inhibits growth and induces apoptosis by suppressing
IL-6-inducible STAT3 pathway activation in human colorectal cancer cells
#MMPMID26622533
Jiang Q
; Li Q
; Chen H
; Shen A
; Cai Q
; Lin J
; Peng J
Exp Ther Med
2015[Oct]; 10
(4
): 1602-1608
PMID26622533
show ga
One of the most critical cellular signal transduction pathways known to
malfunction in colorectal cancer is the interleukin-6/signal transducer and
activator of transcription 3 (IL-6/STAT3) pathway. Scutellaria barbata D. Don
(SB) is well-known traditional medicine in China that targets STAT3 signaling,
and it has long been used to treat various types of cancer; however, the precise
mechanism of its antitumor activity remains largely unclear. In order to further
elucidate this underlying mechanism, an ethanol extract of SB (EESB) in cancer
treatment. The aim of the present study was to evaluate the effects of EESB on
the IL-6-inducible STAT3 pathway. We tested the dose-response association between
EESB, IL-6-induced proliferaion and apoptosis using an MTT assay, colony
formation and flow cytometry analysis in vitro. In addition, caspase-9 and
caspase-3 activation was determined using a colorimetric assay, the activity of
IL-6-induced STAT3 pathway was evaluated using western blot analysis, and the
expression levels of cyclin D1, cyclin-dependent kinase 4, Bcl2 and
Bcl2-associated X were determined using reverse transcription-polymerase chain
reaction and western blot analysis. In the present study it was found that EESB
could significantly inhibit the IL-6-mediated increase in STAT3 phosphorylation
levels and transcriptional activity in HT-29 human colon carcinoma cells,
resulting in the suppression of cell proliferation and the induction of
apoptosis. In addition, treatment with EESB markedly inhibited the IL-6-induced
upregulation of cyclin D1 and B-cell lymphoma-2, two key target genes of the
STAT3 pathway. These results suggest that treatment with EESB could effectively
inhibit the proliferation and promote the apoptosis of human colon carcinoma
cells via modulation of the IL-6/STAT3 signaling pathway and its target genes.