Preferential liver gene expression with polypropylenimine dendrimers

Andreas G. Schätzlein, Bernd H. Zinselmeyer, Adurrahim Elouzi, Christine Dufès, Ya Tsz A. Chim, Clive J. Roberts, Martyn C. Davies, Avril Munro, Alexander I. Gray, Ijeoma F. Uchegbu

Research output: Contribution to journalArticle

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Abstract

Previously, the lower generation (DAB 8-generation 2 and DAB 16-generation 3) polypropylenimine dendrimers have been shown to be effective gene delivery systems in vitro. In the current work, we sought to: (a) test the effect of the strength of the carrier, DNA electrostatic interaction on gene transfer and (b) to study the in vivo gene transfer activity of these low molecular weight (<1687 Da) non-amphiphilic plain and quaternary ammonium gene carriers. Towards this aim, methyl quaternary ammonium derivatives of DAB 4 (generation 1), DAB 8, DAB 16 and DAB 32 (generation 4) were synthesised to give Q4, Q8, Q16 and Q32, respectively. Quaternisation of DAB 8 proved to be critical in improving DNA binding, as evidenced by data from the ethidium bromide exclusion assay and dendrimer-DNA colloidal stability data. This improved colloidal stability had a major effect on vector tolerability, as Q8-DNA formulations were well tolerated on intravenous injection while a similar DAB 8-DNA dose was lethally toxic by the same route. Quaternisation also improved the in vitro cell biocompatibility of DAB 16-DNA and DAB 32-DNA dendrimer complexes by about 4-fold but not that of the lower generation DAB 4-DNA and DAB 8-DNA formulations. In contrast to previous reports with non-viral gene delivery systems, the intravenous administration of DAB 16-DNA and Q8-DNA formulations resulted in liver targeted gene expression as opposed to the lung targeted gene expression obtained with the control polymer-Exgen 500 [linear poly(ethylenimine)] and a lung avoidance hypothesis is postulated. We conclude that the polypropylenimine dendrimers are promising gene delivery systems which may be used to target the liver and avoid the lung and also that molecular modifications conferring colloidal stability on gene delivery formulations have a profound effect on their tolerability on intravenous administration.
LanguageEnglish
Pages247-258
Number of pages12
JournalJournal of Controlled Release
Volume101
Issue number1-3
DOIs
StatePublished - 2005

Fingerprint

Dendrimers
Gene Expression
Liver
DNA
Gene Transfer Techniques
Ammonium Compounds
Intravenous Administration
Lung
Genes
poly(propyleneimine)
Ethidium
Poisons
Static Electricity
Intravenous Injections
Polymers
Molecular Weight

Keywords

  • polypropylenimine dendrimers
  • dendrimers
  • gene delivery
  • quaternary ammonium dendrimers
  • liver targeting
  • liver
  • particles
  • pharmacology

Cite this

Schätzlein, A. G., Zinselmeyer, B. H., Elouzi, A., Dufès, C., Chim, Y. T. A., Roberts, C. J., ... Uchegbu, I. F. (2005). Preferential liver gene expression with polypropylenimine dendrimers. Journal of Controlled Release, 101(1-3), 247-258. DOI: 10.1016/j.jconrel.2004.08.024
Schätzlein, Andreas G. ; Zinselmeyer, Bernd H. ; Elouzi, Adurrahim ; Dufès, Christine ; Chim, Ya Tsz A. ; Roberts, Clive J. ; Davies, Martyn C. ; Munro, Avril ; Gray, Alexander I. ; Uchegbu, Ijeoma F./ Preferential liver gene expression with polypropylenimine dendrimers. In: Journal of Controlled Release. 2005 ; Vol. 101, No. 1-3. pp. 247-258
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Schätzlein, AG, Zinselmeyer, BH, Elouzi, A, Dufès, C, Chim, YTA, Roberts, CJ, Davies, MC, Munro, A, Gray, AI & Uchegbu, IF 2005, 'Preferential liver gene expression with polypropylenimine dendrimers' Journal of Controlled Release, vol. 101, no. 1-3, pp. 247-258. DOI: 10.1016/j.jconrel.2004.08.024

Preferential liver gene expression with polypropylenimine dendrimers. / Schätzlein, Andreas G.; Zinselmeyer, Bernd H.; Elouzi, Adurrahim; Dufès, Christine; Chim, Ya Tsz A.; Roberts, Clive J.; Davies, Martyn C.; Munro, Avril; Gray, Alexander I.; Uchegbu, Ijeoma F.

In: Journal of Controlled Release, Vol. 101, No. 1-3, 2005, p. 247-258.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Preferential liver gene expression with polypropylenimine dendrimers

AU - Schätzlein,Andreas G.

AU - Zinselmeyer,Bernd H.

AU - Elouzi,Adurrahim

AU - Dufès,Christine

AU - Chim,Ya Tsz A.

AU - Roberts,Clive J.

AU - Davies,Martyn C.

AU - Munro,Avril

AU - Gray,Alexander I.

AU - Uchegbu,Ijeoma F.

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PY - 2005

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AB - Previously, the lower generation (DAB 8-generation 2 and DAB 16-generation 3) polypropylenimine dendrimers have been shown to be effective gene delivery systems in vitro. In the current work, we sought to: (a) test the effect of the strength of the carrier, DNA electrostatic interaction on gene transfer and (b) to study the in vivo gene transfer activity of these low molecular weight (<1687 Da) non-amphiphilic plain and quaternary ammonium gene carriers. Towards this aim, methyl quaternary ammonium derivatives of DAB 4 (generation 1), DAB 8, DAB 16 and DAB 32 (generation 4) were synthesised to give Q4, Q8, Q16 and Q32, respectively. Quaternisation of DAB 8 proved to be critical in improving DNA binding, as evidenced by data from the ethidium bromide exclusion assay and dendrimer-DNA colloidal stability data. This improved colloidal stability had a major effect on vector tolerability, as Q8-DNA formulations were well tolerated on intravenous injection while a similar DAB 8-DNA dose was lethally toxic by the same route. Quaternisation also improved the in vitro cell biocompatibility of DAB 16-DNA and DAB 32-DNA dendrimer complexes by about 4-fold but not that of the lower generation DAB 4-DNA and DAB 8-DNA formulations. In contrast to previous reports with non-viral gene delivery systems, the intravenous administration of DAB 16-DNA and Q8-DNA formulations resulted in liver targeted gene expression as opposed to the lung targeted gene expression obtained with the control polymer-Exgen 500 [linear poly(ethylenimine)] and a lung avoidance hypothesis is postulated. We conclude that the polypropylenimine dendrimers are promising gene delivery systems which may be used to target the liver and avoid the lung and also that molecular modifications conferring colloidal stability on gene delivery formulations have a profound effect on their tolerability on intravenous administration.

KW - polypropylenimine dendrimers

KW - dendrimers

KW - gene delivery

KW - quaternary ammonium dendrimers

KW - liver targeting

KW - liver

KW - particles

KW - pharmacology

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Schätzlein AG, Zinselmeyer BH, Elouzi A, Dufès C, Chim YTA, Roberts CJ et al. Preferential liver gene expression with polypropylenimine dendrimers. Journal of Controlled Release. 2005;101(1-3):247-258. Available from, DOI: 10.1016/j.jconrel.2004.08.024