Abstract
Purpose
This study was aimed at developing a new active loading method to stably encapsulate staurosporine (STS), a water insoluble drug, into lipid-based nanoparticles (LNPs) for drug targeting to tumors.
Methods
A limited amount of DMSO was included during the active loading process to prevent precipitation and facilitate the loading of insoluble STS into the aqueous core of a LNP. The drug loading kinetics under various conditions was studied and the STS-LNPs were characterized by size, drug-to-lipid ratio, drug release kinetics and in vitro potency. The antitumor efficacy of the STS-LNPs was compared with free STS in a mouse model.
Results
The drug loading efficiency reached 100% within 15 min of incubation at a drug-to-lipid ratio of 0.31 (mol) via an ammonium gradient. STS formed nano-aggregates inside the aqueous core of the LNPs and was stably retained upon storage and in the presence of serum. A 3-fold higher dose of the STS-LNPs could be tolerated by BALB/c mice compared with free STS, leading to nearly complete growth inhibition of a multidrug resistant breast tumor, while free STS only exhibited moderate activity.
Conclusion
This simple and efficient drug loading method produced a stable LNP formulation for STS that was effective for cancer treatment.
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Abbreviations
- AUC:
-
Area under the concentration curve
- CHOL:
-
Cholesterol
- Cl:
-
Clearance
- DMEM:
-
Dulbecco’s Modified Eagle’s medium
- DSPC:
-
1,2-distearoyl-sn-glycero-3-phosphatidylcholine
- DSPE-PEG:
-
1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(poly ethyleneglycol)-2000
- EPR-effect:
-
Enhanced permeability and retention effect
- FBS:
-
Fetal bovine serum
- LNPs:
-
Lipid-based nanoparticles
- MDR:
-
Multi-drug resistance
- MWCO:
-
Molecular weight cut-off
- PDI:
-
Polydispersity index
- STS:
-
Staurosporine
- t1/2 :
-
Half life
- UPLC:
-
Ultra-performance liquid chromatography
- UPLC-MS/MS:
-
Ultra-performance liquid chromatography-tandem mass spectrometer
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Acknowledgments and Disclosures
This work was funded by grants from the Canadian Institutes of Health Research (MOP-119471 and PPP-130153). S.D. Li is a recipient of a Coalition to Cure Prostate Cancer Young Investigator Award from the Prostate Cancer Foundation and a New Investigator Award from Canadian Institutes of Health Research (MSH-130195).
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Tang, WL., Chen, W.C., Roy, A. et al. A Simple and Improved Active Loading Method to Efficiently Encapsulate Staurosporine into Lipid-Based Nanoparticles for Enhanced Therapy of Multidrug Resistant Cancer. Pharm Res 33, 1104–1114 (2016). https://doi.org/10.1007/s11095-015-1854-4
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DOI: https://doi.org/10.1007/s11095-015-1854-4