H19-Derived miR-675 Plays Crucial Role in Colon Cancer Development

In a study published in Carcinogenesis, researchers from the University of Hong Kong revealed that H19-derived miR-675 downregulates the tumor suppressor retinoblastoma (RB), contributing to the development of colorectal cancer. The study found that both H19 and miR-675 are upregulated in human colon cancer cell lines and primary human colorectal cancer tissues compared to adjacent non-cancerous tissues. The researchers discovered a direct relationship between miR-675 and RB, with miR-675 suppressing RB expression and increasing tumor cell growth.

Key Takeaways:

• H19-derived miR-675 is upregulated in human colon cancer cell lines and primary human colorectal cancer tissues.
• miR-675 directly targets and suppresses the tumor suppressor retinoblastoma (RB) in human colon cancer cells.
• Suppression of miR-675 by transfection with anti-miR-675 increased RB expression and decreased cell growth and soft agar colony formation.
• Enhanced miR-675 expression by transfection with miR-675 precursor decreased RB expression, increased tumor cell growth, and soft agar colony formation.
• The inverse relationship between RB and H19/miR-675 expressions was also observed in human CRC tissues and colon cancer cell lines.
• The study suggests that H19-derived miR-675 may serve as a potential target for colorectal cancer therapy.

Statistics:

• Both H19 and miR-675 were found to be upregulated in human colon cancer cell lines and primary human colorectal cancer tissues compared to adjacent non-cancerous tissues (Carcinogenesis, 2010;31(3):350-8).
• The tumor suppressor RB was confirmed to be a direct target of miR-675 in human colon cancer cells (Carcinogenesis, 2010;31(3):350-8).

Sources:

• W.P. Tsang, et al. "Oncofetal H19-derived miR-675 regulates tumor suppressor RB in human colorectal cancer." Carcinogenesis, 2010;31(3):350-8.
• Colon Cancer Cell Biology.