Abstract
Purpose
Mono- and dual-decorated (DUAL) liposomes (LIP) were prepared, by immobilization of MAb against transferrin (TfR[OX26 or RI7217]) and/or a peptide analogue of ApoΕ3 (APOe) -to target low-density lipoprotein receptor(LPR)-, characterized physicochemically and investigated for BBB-targeting, in-vitro and in-vivo.
Methods
Human microvascular endothelial cells (hCMEC/D3) were used as BBB model, and brain targeting was studied by in-vivo imaging of DiR-labelled formulations (at two doses and surface ligand densities), followed by ex-vivo organ imaging.
Results
LIP diameter was between 100 nm and 150 nm, their stability was good and they were non-cytotoxic. LIP uptake and transport across the hCMEC/D3 cell monolayer was significantly affected by decoration with APOe or MAb, the DUAL exerting an additive effect. Intact vesicle-transcytosis was confirmed by equal transport of hydrophilic and lipophilic labels. In-vivo and ex-vivo results confirmed MAb and DUAL-LIP increased brain targeting compared to non-targeted PEG-LIPs, but not for APOe (also targeting ability of DUAL-LIP was not higher than MAb-LIP). The contradiction between in-vitro and in-vivo results was overruled when in-vitro studies (uptake and monolayer transport) were carried out in presence of serum proteins, revealing their important role in targeted-nanoformulation performance.
Conclusions
A peptide analogue of ApoΕ3 was found to target BBB and increase the targeting potential of TfR-MAb decorated LIP, in-vitro, but not in-vivo, indicating that different types of ligands (small peptides and antibodies) are affected differently by in-vivo applying conditions. In-vitro tests, carried out in presence of serum proteins, may be a helpful predictive “targetability” tool.
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Acknowledgments and Disclosures
E. Markoutsa and K. Papadia equally contributed to this paper. The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007–2013) under grant agreements n° 212043 (to SGA) and 260524 (to GTS). Authors are grateful to Dr. Pierre-Oliver Couraud (Inserm, Paris, FR) for providing the hCMEC/D3 cell line, and Dr. M Gregori (University Milano-Biccoca, Milan, IT) for her help in MAb thiolation.
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Markoutsa, E., Papadia, K., Giannou, A.D. et al. Mono and Dually Decorated Nanoliposomes for Brain Targeting, In Vitro and In Vivo Studies. Pharm Res 31, 1275–1289 (2014). https://doi.org/10.1007/s11095-013-1249-3
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DOI: https://doi.org/10.1007/s11095-013-1249-3