Boron-loaded liposomes in the treatment of hepatic metastases: preliminary investigation by autoradiography analysis.

Abstract:

:Boronophenylalanine (BPA)-loaded conventional and stabilized liposomes were prepared by the reversed phase evaporation method to treat liver metastases by boron neutron capture therapy. Conventional vesicles were composed of phosphatidylcholine and cholesterol, molar ratio 1:1. To obtain stealth liposomes, GM1 or PEG were included in the lipidic bilayer at a concentration of 6.67 or 5 mol%, respectively. Large unilamellar vesicles were formulated encapsulating BPA in the liposome aqueous compartment as a complex with fructose; BPA free base also was embedded into the lipidic bilayer. In vivo experiments were carried out after intravenous injection of liposome suspensions in BD-IX strain rats in which liver metastases had been induced. Alpha particle spectroscopy associated with histological analysis was performed to visualize boron spatial distribution in liver. Simultaneously, tissue boron concentrations were determined using inductively coupled plasma-mass spectroscopy. Results showed that PEG-modified liposomes accumulated boron in therapeutic concentrations (> 30 micrograms boron/g tissue) in metastatic tissue. The PEG-liposomes could be further explored in enhancing boron delivery to tumor cells.

journal_name

Drug Deliv

journal_title

Drug delivery

authors

Pavanetto F,Perugini P,Genta I,Minoia C,Ronchi A,Prati U,Roveda L,Nano R

doi

10.1080/107175400266669

keywords:

subject

Has Abstract

pub_date

2000-04-01 00:00:00

pages

97-103

issue

2

eissn

1071-7544

issn

1521-0464

journal_volume

7

pub_type

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