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Antisense overexpression of BMAL2 enhances cell proliferation
Chau-Ting Yeh1, Su-Chuan Lu, I-Chu Tseng
1Liver Research Unit, Chang Gung Memorial Hospital, 199 Tung Hwa North Road, Taipei, Taiwan. chauting@adm.cgmh.org.tw
Oncogene
|August 15, 2003
Summary
Researchers identified frequently downregulated genes in hepatocellular carcinoma (HCC), including BMAL2. Overexpressing antisense BMAL2 RNA enhanced cell proliferation, suggesting its role in HCC development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Hepatocellular carcinoma (HCC) is a prevalent cancer with complex genetic alterations.
- Identifying frequently downregulated genes is crucial for understanding HCC pathogenesis.
Purpose of the Study:
- To identify genes frequently downregulated in hepatocellular carcinoma (HCC).
- To investigate the functional role of the downregulated gene BMAL2 in cell proliferation.
Main Methods:
- Established a panel of putative underexpressed genes using in-house cDNA macroarray.
- Validated gene downregulation using semiquantitative RT-PCR, Northern analysis, and customized cDNA microarray.
- Examined the effect of BMAL2 on cell proliferation via antisense RNA overexpression in 293EBNA cells.
Main Results:
- Confirmed downregulation of several genes, including BMAL2, in HCC using multiple methods.
- Overexpression of antisense BMAL2 RNA led to reduced cell cycle time and increased soft agar colony formation.
- BMAL2 downregulation diminished TNF-alpha-induced caspase-3 activity and altered cell cycle distribution (decreased G2, increased S phase).
Conclusions:
- A panel of frequently downregulated genes in HCC, including BMAL2, was identified through combined molecular methods.
- Antisense overexpression of BMAL2 enhances cellular proliferation, indicating its tumor-suppressive role in HCC.