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MTUS1 and its targeting miRNAs in colorectal carcinoma: significant associations

Onder Ozcan1, Murat Kara2, Onder Yumrutas3

  • 1Faculty of Medicine, Department of General Surgery, Mugla Sitki Kocman University, Mugla, Turkey.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|December 9, 2015
PubMed

Insights

MicroRNA (miRNA) dysregulation contributes to colorectal cancer (CRC) development. This study found reduced tumor suppressor MTUS1 levels in CRC, with specific miRNAs targeting MTUS1 being upregulated, suggesting a role in CRC pathogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA (miRNA) deregulation is implicated in colorectal cancer (CRC) pathogenesis.
  • Identifying miRNA targets crucial for malignant transformation is vital for understanding CRC.
  • The tumor suppressor gene, microtubule-associated tumor suppressor 1 (MTUS1), is a key player in cellular processes relevant to cancer.

Purpose of the Study:

  • To investigate the expression levels of the tumor suppressor MTUS1 and its regulatory miRNAs in colorectal cancer.
  • To determine the relationship between MTUS1 expression and specific miRNA profiles in CRC tissues.
  • To elucidate the potential roles of MTUS1-targeting miRNAs in CRC development.

Main Methods:

  • Computational prediction and validation of MTUS1 gene targets.
  • Quantification of MTUS1 and miRNA expression using 96.96 Dynamic Array™ integrated fluidic circuit (Fluidigm).
  • Analysis of gene and miRNA expression in formalin-fixed, paraffin-embedded (FFPE) colorectal cancer tissues compared to controls.

Main Results:

  • MTUS1 expression was significantly diminished in CRC tissues compared to control samples.
  • Several MTUS1-targeting miRNAs (e.g., miR-135b-5p, miR-373-3p, miR-183-5p) were markedly upregulated in CRC.
  • Conversely, certain miRNAs (e.g., let-7a-5p, miR-125a-5p) showed downregulated expression in CRC tissues, potentially acting independently of MTUS1.

Conclusions:

  • Upregulated miRNAs targeting MTUS1 may contribute to colorectal cancer development by downregulating this tumor suppressor.
  • Specific miRNAs, independent of MTUS1, may also play significant roles in CRC carcinogenesis.
  • These findings highlight MTUS1-targeting miRNAs as potential key players in CRC pathophysiology and therapeutic targets.
Keywords:
Colorectal cancerMTUS1miR-135b-5pmiR-183-5pmiR-373-3pmiRNA

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