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2017 ; 36
(29
): 4150-4160
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The histone demethylase KDM3A, and its downstream target MCAM, promote Ewing
Sarcoma cell migration and metastasis
#MMPMID28319067
Sechler M
; Parrish JK
; Birks DK
; Jedlicka P
Oncogene
2017[Jul]; 36
(29
): 4150-4160
PMID28319067
show ga
Ewing Sarcoma is the second most common solid pediatric malignant neoplasm of
bone and soft tissue. Driven by EWS/Ets, or rarely variant, oncogenic fusions,
Ewing Sarcoma is a biologically and clinically aggressive disease with a high
propensity for metastasis. However, the mechanisms underpinning Ewing Sarcoma
metastasis are currently not well understood. In the present study, we identify
and characterize a novel metastasis-promotional pathway in Ewing Sarcoma,
involving the histone demethylase KDM3A, previously identified by our laboratory
as a new cancer-promoting gene in this disease. Using global gene expression
profiling, we show that KDM3A positively regulates genes and pathways implicated
in cell migration and metastasis, and demonstrate, using functional assays, that
KDM3A promotes migration in vitro and experimental, post-intravasation,
metastasis in vivo. We further identify the melanoma cell adhesion molecule
(MCAM) as a novel KDM3A target gene in Ewing Sarcoma, and an important effector
of KDM3A pro-metastatic action. Specifically, we demonstrate that MCAM depletion,
like KDM3A depletion, inhibits cell migration in vitro and experimental
metastasis in vivo, and that MCAM partially rescues impaired migration due to
KDM3A knock-down. Mechanistically, we show that KDM3A regulates MCAM expression
both through a direct mechanism, involving modulation of H3K9 methylation at the
MCAM promoter, and an indirect mechanism, via the Ets1 transcription factor.
Finally, we identify an association between high MCAM levels in patient tumors
and poor survival, in two different Ewing Sarcoma clinical cohorts. Taken
together, our studies uncover a new metastasis-promoting pathway in Ewing
Sarcoma, with therapeutically targetable components.