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RNAi-mediated HOXD3 knockdown inhibits growth in human RKO cells
Fangjun Chen1, Guoping Sun1, Jun Peng2
1Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.
Abstract:
Numerous studies have shown that the multifunctional Homeobox-containing (HOX) D3 gene is involved in various physiological and pathological processes. To elucidate the role and mechanism of HOXD3 in colorectal cancer (CRC), we measured its expression in five CRC cell lines. After determining that HOXD3 was highly expressed in the human RKO cancer cell line, we used lentiviral-mediated small interfering RNAs (siRNAs) to knock down HOXD3 expression and assessed proliferation, cell cycle distribution, apoptosis and colony formation using cell proliferation, flow cytometric, and colony formation assays. The expression of HOXD3 was strongly suppressed in the RKO cells infected with the lentiviruse expressing an HOXD3 short hairpin RNA (shRNA). The downregulation of HOXD3 expression in RKO cells significantly decreased proliferation and colony formation, and increased apoptosis in vitro, compared to the cells infected with the mock control (p<0.01). Moreover, specific downregulation of HOXD3 led to the accumulation of cells at the G2 phase of the cell cycle. Our findings revealed that the HOXD3 gene promotes CRC cell growth and plays a pivotal role in the development and survival of malignant human colorectal cancer cells.
Insights
The Homeobox-containing (HOX) D3 gene promotes colorectal cancer (CRC) cell growth. Downregulating HOXD3 in CRC cells significantly reduced proliferation and colony formation while increasing apoptosis, highlighting its role in cancer survival.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- The Homeobox-containing (HOX) D3 gene is a multifunctional gene implicated in various physiological and pathological processes.
- Understanding the specific role of HOXD3 in colorectal cancer (CRC) is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the role and mechanism of HOXD3 in colorectal cancer (CRC) development and progression.
- To determine the effect of HOXD3 downregulation on CRC cell behavior in vitro.
Main Methods:
- HOXD3 expression was analyzed in five CRC cell lines.
- Lentiviral-mediated small interfering RNAs (siRNAs) and short hairpin RNA (shRNA) were used to suppress HOXD3 expression in the RKO cell line.
- Cell proliferation, cell cycle distribution, apoptosis, and colony formation assays were performed.
Main Results:
- HOXD3 was found to be highly expressed in the RKO CRC cell line.
- Downregulation of HOXD3 significantly decreased cell proliferation and colony formation (p<0.01).
- HOXD3 suppression led to increased apoptosis and G2 phase cell cycle arrest in RKO cells.
Conclusions:
- HOXD3 gene promotes colorectal cancer cell growth and survival.
- Targeting HOXD3 may represent a potential therapeutic strategy for managing malignant human colorectal cancer.
