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In vivo and in vitro inhibition of SCLC by combining dual cancer-specific recombinant adenovirus with Etoposide

  • Original Article – Cancer Research
  • Published:
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Abstract

Purpose

Oncolytic virotherapy is emerging as an important modality in cancer treatment. In a previous study, we designed and constructed Ad-Apoptin-hTERTp-E1a (Ad-VT), a dual cancer-selective anti-tumor recombinant adenovirus.

Methods

To explore the therapeutic effect of recombinant adenovirus Ad-VT together with Etoposide on small cell lung cancer, the ability of Ad-VT alone, Etoposide alone, and a combination of Ad-VT + Etoposide to inhibit proliferation of NCI-H446 and BEAS-2B cells was investigated using the WST-1 method. According to the inhibitory action of different combinations, a combination index (CI) was estimated by CalcuSyn software to select the best combination. The inhibitory effect of Ad-VT combined with Etoposide on NCI-H446 and BEAS-2B cells was detected by crystal violet staining and the CFST method. Hoechst, Annexin V and JC-1 staining were used to explore the inhibitory pathway of Ad-VT combined with Etoposide on NCI-H446 cells. The migratory and invasive abilities of treated NCI-H446 cells were assessed by Transwell and BioCat methods. Tumor volume, body weight and survival rate were measured to analyze the anti-tumor and toxic effects of different treatments in tumor-bearing mice.

Results

Ad-VT (20 MOI) combined with Etoposide (400 nM) significantly inhibited NCI-H446 cell proliferation with reduced toxicity of Etoposide to normal cells. Ad-VT induced apoptosis of NCI-H446 cells mainly through the mitochondrial apoptosis pathway, an effect significantly increased by the combined treatment. Ad-VT together with Etoposide significantly inhibited migration and invasion of NCI-H446 cells, inhibited tumor growth in vivo and prolonged the survival of tumor-bearing mice.

Conclusions

The above results indicate that when combined with Etoposide, Ad-VT may have an important role in synergistically inhibiting tumors.

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Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to express their gratitude to EditSprings (https://www.editsprings.cn/) for the expert linguistic services provided.

Funding

This work was supported by the Jilin Province Youth Scientific and Technological Talent Support Project (Grant No. QT202111).

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Authors and Affiliations

Authors

Contributions

Conceived and designed the experiments: TL, XL, LS and GZ. Performed the experiments: TL, JC, YL, XL, YZ, GS, SL, ZX, YL, and NJ. Analyzed the data: TL, XL, LS and GZ. Contributed reagents/materials/analysis tools: YL, XL, YZ, SL, ZX, ZX, and TL. Wrote the paper: TL and XL. All the authors read and approved the final manuscript.

Corresponding authors

Correspondence to Guangzhe Zhu, Lili Sun or Xiao Li.

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Conflict of interest

The authors declare that they have no conflict of interests.

Ethics approval and consent to participate

The animal study was reviewed and approved by the Institutional Animal Care and Use Committee (IACUC) of the Changchun University of Chinese Medicine.

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Li, T., Fang, J., Chu, J. et al. In vivo and in vitro inhibition of SCLC by combining dual cancer-specific recombinant adenovirus with Etoposide. J Cancer Res Clin Oncol 148, 1073–1085 (2022). https://doi.org/10.1007/s00432-021-03899-7

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  • DOI: https://doi.org/10.1007/s00432-021-03899-7

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