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2017 ; 8
(12
): 19592-19608
Nephropedia Template TP
gab.com Text
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English Wikipedia
Cancer-associated fibroblasts release exosomal microRNAs that dictate an
aggressive phenotype in breast cancer
#MMPMID28121625
Donnarumma E
; Fiore D
; Nappa M
; Roscigno G
; Adamo A
; Iaboni M
; Russo V
; Affinito A
; Puoti I
; Quintavalle C
; Rienzo A
; Piscuoglio S
; Thomas R
; Condorelli G
Oncotarget
2017[Mar]; 8
(12
): 19592-19608
PMID28121625
show ga
Cancer-associated fibroblasts (CAFs) are the major components of the tumor
microenvironment. They may drive tumor progression, although the mechanisms
involved are still poorly understood. Exosomes have emerged as important
mediators of intercellular communication in cancer. They mediate horizontal
transfer of microRNAs (miRs), mRNAs and proteins, thus affecting breast cancer
progression. Differential expression profile analysis identified three miRs (miRs
-21, -378e, and -143) increased in exosomes from CAFs as compared from normal
fibroblasts. Immunofluorescence indicated that exosomes may be transferred from
CAFs to breast cancer cells, releasing their cargo miRs. Breast cancer cells
(BT549, MDA-MB-231, and T47D lines) exposed to CAF exosomes or transfected with
those miRs exhibited a significant increased capacity to form mammospheres,
increased stem cell and epithelial-mesenchymal transition (EMT) markers, and
anchorage-independent cell growth. These effects were reverted by transfection
with anti-miRs. Similarly to CAF exosomes, normal fibroblast exosomes transfected
with miRs -21, -378e, and -143 promoted the stemness and EMT phenotype of breast
cancer cells. Thus, we provided evidence for the first time of the role of CAF
exosomes and their miRs in the induction of the stemness and EMT phenotype in
different breast cancer cell lines. Indeed, CAFs strongly promote the development
of an aggressive breast cancer cell phenotype.