MicroRNA Expression in KRAS- and BRAF-mutated Colorectal Cancers.

Abstract:

BACKGROUND/AIM:KRAS and BRAF are two genes commonly mutated in colorectal cancer (CRC). Even though BRAF is a downstream target of KRAS in the MAPK signalling pathway, KRAS- and BRAF-mutated CRCs are found to display several different clinical and histopathological features. We investigated whether a differential expression of microRNAs (miRNAs) could explain the clinicopathological differences seen between KRAS- and BRAF-mutated CRCs. MATERIALS AND METHODS:Using a PCR array, we analyzed the expression of 84 different miRNAs in CRC cell lines wild-type in KRAS and BRAF, or mutated in KRAS or BRAF. RESULTS:Ten miRNAs were selected for further analyses in tumor tissue specimens (let-7a, let-7i, miR-10a, miR-10b, miR-31, miR-100, miR-181a, miR-181b, miR-372, and miR-373). BRAF-mutated tumors were found to express significantly higher levels of miR-31 as well as significantly lower levels of miR-373, compared to wild-type tumors. CONCLUSION:Our results suggest that KRAS- and BRAF-mutated CRCs may have different miRNA signatures compared to CRC tumors wild-type in KRAS and BRAF. However, no difference in expression levels between KRAS- and BRAF-mutated tumors was evident for the miRNAs analyzed in this study.

journal_name

Anticancer Res

journal_title

Anticancer research

authors

Lundberg IV,Wikberg ML,Ljuslinder I,Li X,Myte R,Zingmark C,Löfgren-Burström A,Edin S,Palmqvist R

doi

10.21873/anticanres.12272

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

677-683

issue

2

eissn

0250-7005

issn

1791-7530

pii

38/2/677

journal_volume

38

pub_type

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