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Potential use of folate-polyethylene glycol (PEG)-appended dendrimer (G3) conjugate with α-cyclodextrin as DNA carriers to tumor cells

Cancer Gene Therapy volume 19, pages 358–366 (2012)Cite this article

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Abstract

We previously reported that polyamidoamine STARBURST dendrimer (generation 3, G3) (dendrimer) conjugate with α-cyclodextrin (α-CyD) having an average degree of substitution of 2.4 of α-CyD (α-CDE) provided remarkable aspects as novel carriers for DNA and small-interfering RNA. To develop novel α-CDE derivatives with tumor cell specificity, we prepared folate-appended α-CDEs (Fol-α-CDEs) and folate-polyethylene glycol (PEG)-appended α-CDEs (Fol-PαCs) with the various degrees of substitution of folate (DSF), and evaluated in vitro and in vivo gene transfer activity, cytotoxicity, cellular association and physicochemical properties. In vitro gene transfer activity of Fol-α-CDEs (G3, DSF 2, 5 or 7) was lower than that of α-CDE (G3) in KB cells, folate receptor (FR)-overexpressing cancer cells. Of the three Fol-PαCs (G3, DSF 2, 5 or 7), Fol-PαC (G3, DSF 5) had the highest gene transfer activity in KB cells. The activity of Fol-PαC (G3, DSF 5) was significantly higher than that of α-CDE (G3) in KB cells, but not in A549 cells, FR-negative cells. Negligible cytotoxicity of the plasmid DNA (pDNA) complex with Fol-PαC (G3, DSF 5) was observed in KB cells or A549 cells up to a charge ratio of 100/1 (carrier/pDNA). The cellular association of the pDNA complex with Fol-PαC (G3, DSF 5) could be mediated by FR on KB cells, resulting in its efficient cellular uptake. Fol-PαC (G3, DSF 5) had a higher binding affinity with folate-binding protein than α-CDE (G3), although the physicochemical properties of pDNA complex with Fol-PαC (G3, DSF 5) were almost comparable to that with α-CDE (G3), although the onset charge ratio and the compaction ability of Fol-PαC (G3, DSF 5) were slightly different. Fol-PαC (G3, DSF 5) tended to show a higher gene transfer activity than α-CDE (G3) 12 h after intratumoral administration in mice. These results suggest that Fol-PαC (G3, DSF 5), not Fol-α-CDEs, could be potentially used as a FR-overexpressing cancer cell-selective DNA carrier.

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Authors and Affiliations

  1. Department of Physical Pharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan

    H Arima, M Arizono, T Higashi, A Yoshimatsu, H Ikeda & K Motoyama

  2. Department of Nanochemistry, Tokyo Polytechnic University, Atsugi, Japan

    K Hattori & T Takeuchi

  3. Department of Pharmaceutical Sciences, Sojo University, Kumamoto, Japan

    F Hirayama

  4. DDS Research Institute, Sojo University, Kumamoto, Japan

    K Uekama

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  1. H Arima
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  2. M Arizono
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Correspondence to H Arima.

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Arima, H., Arizono, M., Higashi, T. et al. Potential use of folate-polyethylene glycol (PEG)-appended dendrimer (G3) conjugate with α-cyclodextrin as DNA carriers to tumor cells. Cancer Gene Ther 19, 358–366 (2012). https://doi.org/10.1038/cgt.2012.9

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