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microRNA-375 inhibits colorectal cancer cells proliferation by downregulating JAK2/STAT3 and MAP3K8/ERK signaling

Ran Wei1,2, Qin Yang1, Bing Han1,3

  • 1School of Life Science, Yunnan University, Kunming, Yunnan, 650091, P.R. China.

Oncotarget
|February 11, 2017
PubMed

Insights

MicroRNA-375 acts as a tumor suppressor in colorectal cancer by inhibiting cell proliferation through the JAK2/STAT3 and MAP3K8/ERK pathways. This suggests miR-375 as a potential diagnostic marker and therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA-375 (miR-375) is implicated in various cancers of the digestive system.
  • Down-regulation of miR-375 in colorectal cancer (CRC) tissues suggests a tumor-suppressive role.
  • The precise mechanisms of miR-375 regulation in CRC are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which microRNA-375 influences colorectal cancer progression.
  • To identify potential molecular targets of microRNA-375 in colorectal cancer.
  • To evaluate the therapeutic potential of microRNA-375 in colorectal cancer models.

Main Methods:

  • Bioinformatic analysis to identify potential miR-375 target genes (JAK2, MAP3K8, ATG7).
  • Overexpression of miR-375 in CRC cell lines (HCT116, Caco2, HT29) followed by protein expression analysis (JAK2/STAT3, MAP3K8/ERK, ATG7).
  • Assessment of cell proliferation and migration, and in vivo tumor formation studies in nude mice.

Main Results:

  • JAK2, MAP3K8, and their downstream effectors STAT3 and ERK were upregulated in CRC tissues.
  • Overexpression of miR-375 led to decreased JAK2/STAT3 and MAP3K8/ERK signaling and inhibited cell proliferation.
  • miR-375 suppressed tumor formation in vivo and differentially affected ATG7 expression in CRC cell lines.

Conclusions:

  • MicroRNA-375 functions as a tumor suppressor in colorectal cancer, primarily by targeting the JAK2/STAT3 and MAP3K8/ERK signaling pathways.
  • miR-375 inhibits cancer cell proliferation and tumor formation.
  • These findings highlight miR-375 as a promising diagnostic biomarker and therapeutic agent for colorectal cancer.
Keywords:
ATG7JAK2/STAT3 pathwayMAP3K8/ERK pathwaycolorectal cancermicroRNA-375

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