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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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