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2015 ; 54
(9
): 730-41
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Silibinin prevents prostate cancer cell-mediated differentiation of naïve
fibroblasts into cancer-associated fibroblast phenotype by targeting TGF ?2
#MMPMID24615813
Ting HJ
; Deep G
; Jain AK
; Cimic A
; Sirintrapun J
; Romero LM
; Cramer SD
; Agarwal C
; Agarwal R
Mol Carcinog
2015[Sep]; 54
(9
): 730-41
PMID24615813
show ga
Tumor microenvironment (TM) is an essential element in prostate cancer (PCA),
offering unique opportunities for its prevention. TM includes naïve fibroblasts
that are recruited by nascent neoplastic lesion and altered into
'cancer-associated fibroblasts' (CAFs) that promote PCA. A better understanding
and targeting of interaction between PCA cells and fibroblasts and inhibiting CAF
phenotype through non-toxic agents are novel approaches to prevent PCA
progression. One well-studied cancer chemopreventive agent is silibinin, and
thus, we examined its efficacy against PCA cells-mediated differentiation of
naïve fibroblasts into a myofibroblastic-phenotype similar to that found in CAFs.
Silibinin's direct inhibitory effect on the phenotype of CAFs derived directly
from PCA patients was also assessed. Human prostate stromal cells (PrSCs) exposed
to control conditioned media (CCM) from human PCA PC3 cells showed more
invasiveness, with increased alpha-smooth muscle actin (?-SMA) and vimentin
expression, and differentiation into a phenotype we identified in CAFs.
Importantly, silibinin (at physiologically achievable concentrations) inhibited
?-SMA expression and invasiveness in differentiated fibroblasts and prostate CAFs
directly, as well as indirectly by targeting PCA cells. The observed increase in
?-SMA and CAF-like phenotype was transforming growth factor (TGF) ?2 dependent,
which was strongly inhibited by silibinin. Furthermore, induction of ?-SMA and
CAF phenotype by CCM were also strongly inhibited by a TGF?2-neutralizing
antibody. The inhibitory effect of silibinin on TGF?2 expression and CAF-like
biomarkers was also observed in PC3 tumors. Together, these findings highlight
the potential usefulness of silibinin in PCA prevention through targeting the CAF
phenotype in the prostate TM.