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Onkološki inštitut Ljubljana (OILJ)
  • Antitumor effect of antibiotic resistance gene-free plasmids encoding interleukin-12 in canine melanoma model
    Lampreht Tratar, Urša ...
    The electrotransfer of interleukin-12 (IL-12) has been demonstrated as an efficient and safe treatment for tumors in veterinary oncology. However, the plasmids used encode human or feline IL-12 and ... harbor the gene for antibiotic resistance. Therefore, our aim was to construct plasmids encoding canine IL-12 without the antibiotic resistance genes driven by two different promoters: constitutive and fibroblast-specific. The results obtained in vitro in different cell lines showed that following gene electrotransfer, the newly constructed plasmids had cytotoxicity and expression profiles comparable to plasmids with antibiotic resistance genes. Additionally, in vivo studies showed a statistically significant prolonged tumor growth delay of CMeC-1 tumors compared to control vehicle-treated mice after intratumoral gene electrotransfer. Besides the higher gene expression obtained by plasmids with constitutive promoters, the main difference between both plasmids was in the distribution of the transgene expression. Namely, after gene electrotransfer, plasmids with constitutive promoters showed an increase of serum IL-12, whereas the gene expression of IL-12, encoded by plasmids with fibroblast-specific promoters, was restricted to the tumor. Furthermore, after the gene electrotransfer of plasmids with constitutive promoters, granzyme B-positive cells were detected in the tumor and spleen, indicating a systemic effect of the therapy. Therefore, plasmids with different promoters present valuable tools for focused therapy with local or systemic effects. The results of the present study demonstrated that plasmids encoding canine IL-12 under constitutive and fibroblast-specific promoters without the gene for antibiotic resistance provide feasible tools for controlled gene delivery that could be used for the treatment of client-owned dogs.
    Vir: Cancer gene therapy. - ISSN 0929-1903 (Vol. 25, no. 9/10, 2018, str. 260-273)
    Vrsta gradiva - članek, sestavni del
    Leto - 2018
    Jezik - angleški
    COBISS.SI-ID - 2897531
    DOI

vir: Cancer gene therapy. - ISSN 0929-1903 (Vol. 25, no. 9/10, 2018, str. 260-273)

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