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Effect of down-regulating VEGF on proliferation of colon carcinoma cell HT-29
Xiao Zhang1, Yinlin Ge1, Hongwei Wang2
11Department of Biochemistry and Molecular Biology, Medical College, Qingdao University, Qingdao, 266021 China.
Abstract:
We designed specific small interfering RNA (siRNA) targeting vascular endothelial growth factor (VEGF) mRNA and synthesized oligo fragments, then siRNA was obtained by in vitro transcription and transfected into cultured human colon carcinoma cell line HT-29 with lipofectamine. We also analyzed the effect of the siRNA on proliferation of HT-29 cells by methyl thiazolyl tetrazolium (MTT) assay and expression level of VEGF mRNA of transfected cells by RT-PCR as well as amounts of secreted VEGF protein in the supernatant by enzyme linked immunosorbent assay (ELISA). Two groups of siRNA targeting human VEGF effectively inhibited proliferation of HT-29 cells after transfection. The secretion of VEGF protein also notably decreased, but the control scramble siRNA showed no effect.
Insights
Small interfering RNA (siRNA) targeting vascular endothelial growth factor (VEGF) effectively inhibited HT-29 colon cancer cell proliferation and reduced VEGF secretion. Control siRNA had no impact, validating VEGF as a therapeutic target.
Area of Science:
- Molecular Biology
- Cancer Research
- RNA Interference
Background:
- Vascular Endothelial Growth Factor (VEGF) plays a crucial role in tumor angiogenesis and progression.
- Targeting VEGF is a promising strategy for cancer therapy.
Purpose of the Study:
- To investigate the efficacy of small interfering RNA (siRNA) targeting VEGF mRNA in inhibiting human colon carcinoma cell (HT-29) proliferation.
- To assess the impact of VEGF-targeting siRNA on VEGF mRNA and protein expression.
Main Methods:
- Design and synthesis of specific siRNA targeting human VEGF mRNA.
- In vitro transcription to obtain siRNA, followed by lipofection into HT-29 cells.
- Analysis of cell proliferation using MTT assay, VEGF mRNA levels via RT-PCR, and secreted VEGF protein using ELISA.
Main Results:
- Two distinct siRNA sequences targeting VEGF significantly inhibited HT-29 cell proliferation.
- VEGF-targeting siRNA treatment led to a notable decrease in secreted VEGF protein levels.
- Control scramble siRNA demonstrated no significant effect on cell proliferation or VEGF expression.
Conclusions:
- siRNA targeting VEGF is an effective approach to inhibit colon cancer cell proliferation.
- VEGF-targeting siRNA reduces both VEGF production and secretion, highlighting its therapeutic potential.
- These findings support the development of siRNA-based therapies for VEGF-dependent cancers.
