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Palmitoyl Ascorbate Liposomes and Free Ascorbic Acid: Comparison of Anticancer Therapeutic Effects Upon Parenteral Administration

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ABSTRACT

Purpose

To evaluate and compare anticancer therapeutic effect of palmitoyl ascorbate liposomes (PAL) and free ascorbic acid (AA).

Methods

Liposomes incorporating palmitoyl ascorbate (PA) were prepared and evaluated for PA content by HPLC. To elucidate mechanism of action of cell death in vitro, effect of various H2O2 scavengers and metal chelators on PA-mediated cytotoxicity was studied. Effect of various combinations of PAL and free AA on in vitro cytotoxicity was evaluated on 4T1 cells. In vivo, PAL formulation was modified with polyethylene glycol; effect of PEGylation on in vitro cytotoxicity was evaluated. Biodistribution of PEG-PAL formulation was investigated in female Balb/c mice bearing murine mammary carcinoma (4T1 cells). In vivo anticancer activity of PEG-PAL (PEG-PAL equivalent to 20 mg/kg of PA injected intravenously on alternate days) was compared with free AA therapy in same model.

Results

PEG-PAL treatment was significantly more effective than free AA treatment in slowing tumor growth.

Conclusions

Nanoparticle formulations incorporating PA can kill cancer cells in vitro. The mechanism of PA cytotoxicity is based on production of extracellular reactive oxygen species and involves intracellular transition metals.

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Abbreviations

AA:

ascorbic acid

DHAA:

dehydroascorbic acid

DFO:

desferrioxamine mesylate

DMEM:

Dulbecco’s Modified Eagle Medium

DTPA-PE:

1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine-N-diethylenetriaminepentaacetic acid

EDTA:

ethylenediaminetetraacetic acid

FBS:

fetal bovine serum

GLUTs:

glucose transporters

HIF:

hypoxia-inducible factors

PA:

palmitoyl ascorbate

PAL:

palmitoyl ascorbate liposomes

PEG2000-PE:

1, 2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy (poly (ethylene glycol))-2000] (PEG2000-PE)

PL:

plain liposomes

ROS:

reactive oxygen species

SOD:

superoxide dismutase

TCEP:

tris(2-carboxyethyl) phosphine hydrochloride

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ACKNOWLEDGMENTS & DISCLOSURES

This research is based on a hypothesis originated and proposed by Anthony R. Manganaro. Funding was provided by Anthony R. Manganaro.

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Corresponding author

Correspondence to Vladimir P. Torchilin.

Additional information

Rupa R. Sawant and Onkar S. Vaze contributed equally to this study.

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Sawant, R.R., Vaze, O.S., Wang, T. et al. Palmitoyl Ascorbate Liposomes and Free Ascorbic Acid: Comparison of Anticancer Therapeutic Effects Upon Parenteral Administration. Pharm Res 29, 375–383 (2012). https://doi.org/10.1007/s11095-011-0557-8

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  • DOI: https://doi.org/10.1007/s11095-011-0557-8

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