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Wnt inhibitory factor inhibits lung cancer cell growth
Jae Kim1, Liang You, Zhidong Xu
1Thoracic Oncology Laboratory, UCSF Comprehensive Cancer Center, San Francisco, Calif 94143, USA.
Objective:
Aberrant activation of the Wnt signaling pathway is associated with the pathogenesis of multiple cancers, including non-small cell lung cancer. Wnt inhibitory factor, a secreted Wnt antagonist, is downregulated in non-small cell lung cancer. We hypothesized that restoration of Wnt inhibitory factor function would inhibit lung cancer cell growth.
Methods:
The lung cancer cell lines A549 and H460 were transfected with an expression vector containing the Wnt inhibitory factor gene. Apoptosis rates and colony formation were measured after transfection. Recombinant Wnt inhibitory factor protein was used to treat H460 cells, and proliferation rates were measured with an MTS assay. Finally, Wnt inhibitory factor plasmid was peritumorally injected near H460 tumor xenografts in nude mice.
Results:
Wnt inhibitory factor-transfected cells had increased apoptosis and decreased colony formation than control cells. Recombinant human Wnt inhibitory factor protein was also able to inhibit H460 cell proliferation measured by using the MTS assay. Wnt inhibitory factor plasmid significantly inhibited the growth in vivo of H460 tumor xenografts in nude mice.
Conclusion:
These data suggest that Wnt inhibitory factor is able to inhibit lung cancer cell growth both in vitro and in vivo and provides additional evidence that Wnt inhibitory factor plays an important role in Wnt pathway regulation in lung cancer.
Insights
Restoring Wnt inhibitory factor (WIF) function suppressed non-small cell lung cancer cell growth in laboratory and animal models. This suggests WIF is a potential therapeutic target for lung cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Signaling Pathways
Background:
- Aberrant Wnt signaling pathway activation drives multiple cancers, including non-small cell lung cancer (NSCLC).
- Wnt inhibitory factor (WIF), a Wnt antagonist, shows reduced expression in NSCLC.
- WIF's role in NSCLC pathogenesis warrants further investigation.
Purpose of the Study:
- To investigate the therapeutic potential of restoring Wnt inhibitory factor function in non-small cell lung cancer.
- To determine if WIF can inhibit lung cancer cell proliferation and induce apoptosis.
Main Methods:
- Lung cancer cell lines (A549, H460) were transfected with Wnt inhibitory factor (WIF) expression vector.
- Apoptosis and colony formation assays were performed post-transfection.
- Recombinant WIF protein and WIF plasmid were used to assess effects on cell proliferation and tumor xenograft growth in vivo.
Main Results:
- WIF transfection led to increased apoptosis and reduced colony formation in lung cancer cells.
- Recombinant WIF protein inhibited H460 cell proliferation.
- WIF plasmid injection significantly suppressed H460 tumor xenograft growth in nude mice.
Conclusions:
- Wnt inhibitory factor demonstrates potent inhibition of lung cancer cell growth both in vitro and in vivo.
- These findings highlight WIF's critical role in Wnt pathway regulation within lung cancer.
- Restoration of WIF function represents a promising therapeutic strategy for NSCLC.
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