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2015 ; 13
(4
): 604-12
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gab.com Text
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English Wikipedia
Membrane-to-Nucleus Signals and Epigenetic Mechanisms for Myofibroblastic
Activation and Desmoplastic Stroma: Potential Therapeutic Targets for Liver
Metastasis?
#MMPMID25548101
Kang N
; Shah VH
; Urrutia R
Mol Cancer Res
2015[Apr]; 13
(4
): 604-12
PMID25548101
show ga
Cancer-associated fibroblasts (CAFs), the most abundant cells in the tumor
microenvironment (TME), are a key source of the extracellular matrix (ECM) that
constitutes the desmoplastic stroma. Through remodeling of the reactive tumor
stroma and paracrine actions, CAFs regulate cancer initiation, progression, and
metastasis, as well as tumor resistance to therapies. The CAFs found in
stroma-rich primary hepatocellular carcinomas (HCC) and liver metastases of
primary cancers of other organs predominantly originate from hepatic stellate
cells (HSTC), which are pericytes associated with hepatic sinusoids. During tumor
invasion, HSTCs transdifferentiate into myofibroblasts in response to paracrine
signals emanating from either tumor cells or a heterogeneous cell population
within the hepatic tumor microenvironment. Mechanistically, HSTC-to-myofibroblast
transdifferentiation, also known as, HSTC activation, requires cell surface
receptor activation, intracellular signal transduction, gene transcription, and
epigenetic signals, which combined ultimately modulate distinct gene expression
profiles that give rise to and maintain a new phenotype. The current review
defines a paradigm that explains how HSTCs are activated into CAFs to promote
liver metastasis. Furthermore, a focus on the most relevant intracellular
signaling networks and epigenetic mechanisms that control HSTC activation is
provided. Finally, we discuss the feasibility of targeting CAF/activated HSTCs,
in isolation or in conjunction with targeting cancer cells, which constitutes a
promising and viable therapeutic approach for the treatment of primary
stroma-rich liver cancers and liver metastasis.