Journal
ONCOTARGET
Volume 6, Issue 34, Pages 35183-35201Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.5930
Keywords
brain metastases; lung cancer; mir-145-5p; epigenetic modifications; migration
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Funding
- AIRC [AIRC 14455]
- EPIGEN [13/05/R/42]
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Brain metastasis is a major cause of morbidity and mortality of lung cancer patients. We assessed whether aberrant expression of specific microRNAs could contribute to brain metastasis. Comparison of primary lung tumors and their matched metastatic brain disseminations identified shared patterns of several microRNAs, including common down-regulation of miR-145-5p. Down-regulation was attributed to methylation of miR-145's promoter and affiliated elevation of several protein targets, such as EGFR, OCT-4, MUC-1, c-MYC and, interestingly, tumor protein D52 (TPD52). In line with these observations, restored expression of miR-145-5p and selective depletion of individual targets markedly reduced in vitro and in vivo cancer cell migration. In aggregate, our results attribute to miR-145-5p and its direct targets pivotal roles in malignancy progression and in metastasis.
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