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Specific growth inhibition of small-cell lung cancer cells by adenovirus vector expressing antisense c-kit
Y Yamanishi1, H Maeda, K Hiyama
1Second Department of Internal Medicine, Hiroshima University School of Medicine, Japan.
Abstract:
Antisense methods to control aberrant gene expression have been investigated as therapeutic strategies. A proto-oncogene c-kit, which encodes a transmembrane tyrosine kinase, is overexpressed in some malignancies, including small-cell lung cancer (SCLC), and is thought to be involved in their pathogenesis. To test the feasibility of using adenovirus vectors for antisense strategies and to target c-kit in SCLC therapy, we constructed replication-deficient recombinant adenovirus vectors which express fragments of c-kit transcripts in antisense (Ad.kitAS) or sense orientation (Ad.kitS: control). In vitro infection of SBC-1 cells, which are c-Kit protein-producing SCLC cells, by these vectors resulted in the expression of artificial c-kit transcripts. The Ad.kitAS-infected SBC-1 cells showed reductions in the amount of c-Kit protein. As expected, at 10 days after infection (1 multiplicity of infection), Ad.kitAS-infected SBC-1 cells showed approximately 40% growth inhibition compared to uninfected or Ad.kitS-infected cells in vitro. Such a significant growth inhibition by Ad.kitAS was not induced in SBC-5 cells, which are SCLC cells producing no c-Kit protein. These results demonstrate the usefulness of adenovirus vectors in antisense strategies, and the feasibility of targeting c-kit in the therapy of c-Kit-producing SCLC.
Insights
Antisense therapy using adenovirus vectors targeting the c-kit proto-oncogene effectively inhibited growth in small-cell lung cancer (SCLC) cells that produce c-Kit protein. This approach shows promise for treating SCLC by controlling aberrant gene expression.
Area of Science:
- Oncology
- Molecular Biology
- Gene Therapy
Background:
- Proto-oncogene c-kit overexpression is implicated in small-cell lung cancer (SCLC) pathogenesis.
- Antisense strategies offer a method to control aberrant gene expression.
- Adenovirus vectors are being explored for targeted gene therapy delivery.
Purpose of the Study:
- To evaluate the feasibility of using adenovirus vectors for antisense strategies against c-kit in SCLC.
- To assess the therapeutic potential of targeting c-kit in SCLC.
Main Methods:
- Constructed replication-deficient recombinant adenovirus vectors expressing c-kit transcripts in antisense (Ad.kitAS) and sense (Ad.kitS) orientations.
- Infected SCLC cell lines (SBC-1, c-Kit producing; SBC-5, non-producing) in vitro.
- Measured c-Kit protein levels and cell growth inhibition.
Main Results:
- Ad.kitAS induced expression of artificial c-kit transcripts and reduced c-Kit protein in SBC-1 cells.
- Ad.kitAS resulted in approximately 40% growth inhibition of SBC-1 cells compared to controls.
- No significant growth inhibition was observed in SBC-5 cells, indicating c-kit specificity.
Conclusions:
- Adenovirus vectors are effective for delivering antisense strategies.
- Targeting c-kit with antisense therapy is a feasible approach for treating c-Kit-producing SCLC.
- This study validates the potential of gene-based therapies for specific cancer types.