Peptide-modified liposomes for selective targeting of bombesin receptors overexpressed by cancer cells: A potential theranostic agent

Antonella Accardo, Giuseppina Salsano, Anna Morisco, Michela Aurilio, Antonio Parisi, Francesco Maione, Carla Cicala, Diego Tesauro, Luigi Aloj, Giuseppe De Rosa, Giancarlo Morelli

Research output: Contribution to journalArticle

Abstract

Objectives: Drug delivery systems consisting of liposomes displaying a cell surface receptor-targeting peptide are being developed to specifically deliver chemotherapeutic drugs to tumors overexpressing a target receptor. This study addresses novel liposome composition approaches to specifically target tissues overexpressing bombesin (BN) receptors. Methods: A new amphiphilic peptide derivative (MonY-BN) containing the BN(7-14) peptide, the DTPA (diethylenetriaminepentaacetate) chelating agent, a hydrophobic moiety with two C18 alkyl chains, and polyethylene glycol spacers, has been synthesized by solid-phase methods. Liposomes have been generated by co-aggregation of MonY-BN with 1,2-distearoyl-sn-glycero- 3-phosphocholine (DSPC). The structural and biological properties of these new target-selective drug-delivery systems have been characterized. Results: Liposomes with a DSPC/MonY-BN (97/3 molar ratio) composition showed a diameter of 145.5±31.5 nm and a polydispersity index of 0.20 ± 0.05. High doxorubicin (Dox) loading was obtained with the remote pH gradient method using citrate as the inner buffer. Specific binding to PC-3 cells of DSPC/MonY-BN liposomes was obtained (2.7% ± 0.3%, at 37°C), compared with peptide-free DSPC liposomes (1.4% ± 0.2% at 37°C). Incubation of cells with DSPC/ MonY-BN/Dox showed significantly lower cell survival compared with DSPC/Dox-treated cells, in the presence of 100 ng/mL and 300 ng/mL drug amounts, in cytotoxicity experiments. Intravenous treatment of PC-3 xenograft-bearing mice with DSPC/MonY-BN/Dox at 10 mg/kg Dox dose produced higher tumour growth inhibition (60%) compared with nonspecific DSPC/ Dox liposomes (36%) relative to control animals. Conclusion: The structural and loading properties of DSPC/MonY-BN liposomes along with the observed in-vitro and in-vivo activity are encouraging for further development of this approach for target-specific cancer chemotherapy.

Original languageEnglish
Pages (from-to)2007-2017
Number of pages11
JournalInternational Journal of Nanomedicine
Volume7
DOIs
Publication statusPublished - 2012

Keywords

  • Bombesin peptide
  • Doxorubicin delivery
  • Gastrin-releasing peptide receptors
  • PC-3 cells
  • Theranostic applications

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Organic Chemistry
  • Drug Discovery

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    Accardo, A., Salsano, G., Morisco, A., Aurilio, M., Parisi, A., Maione, F., Cicala, C., Tesauro, D., Aloj, L., De Rosa, G., & Morelli, G. (2012). Peptide-modified liposomes for selective targeting of bombesin receptors overexpressed by cancer cells: A potential theranostic agent. International Journal of Nanomedicine, 7, 2007-2017. https://doi.org/10.2147/IJN.S29242