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2016 ; 376
(2
): 318-27
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Melanoma cell-derived exosomes promote epithelial-mesenchymal transition in
primary melanocytes through paracrine/autocrine signaling in the tumor
microenvironment
#MMPMID27063098
Xiao D
; Barry S
; Kmetz D
; Egger M
; Pan J
; Rai SN
; Qu J
; McMasters KM
; Hao H
Cancer Lett
2016[Jul]; 376
(2
): 318-27
PMID27063098
show ga
The tumor microenvironment is abundant with exosomes that are secreted by the
cancer cells themselves. Exosomes are nanosized, organelle-like membranous
structures that are increasingly being recognized as major contributors in the
progression of malignant neoplasms. A critical element in melanoma progression is
its propensity to metastasize, but little is known about how melanoma
cell-derived exosomes modulate the microenvironment to optimize conditions for
tumor progression and metastasis. Here, we provide evidence that melanoma
cell-derived exosomes promote phenotype switching in primary melanocytes through
paracrine/autocrine signaling. We found that the mitogen-activated protein kinase
(MAPK) signaling pathway was activated during the exosome-mediated
epithelial-to-mesenchymal transition (EMT)-resembling process, which promotes
metastasis. Let-7i, an miRNA modulator of EMT, was also involved in this process.
We further defined two other miRNA modulators of EMT (miR-191 and let-7a) in
serum exosomes for differentiating stage I melanoma patients from non-melanoma
subjects. These results provide the first strong molecular evidence that melanoma
cell-derived exosomes promote the EMT-resembling process in the tumor
microenvironment. Thus, novel strategies targeting EMT and modulating the tumor
microenvironment may emerge as important approaches for the treatment of
metastatic melanoma.
|*Autocrine Communication
[MESH]
|*Epithelial-Mesenchymal Transition
[MESH]
|*Paracrine Communication
[MESH]
|*Tumor Microenvironment
[MESH]
|Adult
[MESH]
|Aged
[MESH]
|Case-Control Studies
[MESH]
|Cell Line, Tumor
[MESH]
|Exosomes/*metabolism
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Male
[MESH]
|Melanocytes/*metabolism/pathology
[MESH]
|Melanoma/genetics/*metabolism/secondary
[MESH]
|MicroRNAs/genetics/metabolism
[MESH]
|Middle Aged
[MESH]
|Mitogen-Activated Protein Kinases/metabolism
[MESH]