Abstract
Purpose
Plitidepsin is an antineoplasic currently in clinical evaluation in a phase III trial in multiple myeloma (ADMYRE). Presently, the hydrophobic drug plitidepsin is formulated using Cremophor®, an adjuvant associated with unwanted hypersensitivity reactions. In search of alternatives, we developed and tested two nanoparticle-based formulations of plitidepsin, aiming to modify/improve drug biodistribution and efficacy.
Methods
Using nanoprecipitation, plitidepsin was loaded in polymer nanoparticles made of amphiphilic block copolymers (i.e. PEG-b-PBLG or PTMC-b-PGA). The pharmacokinetics, biodistribution and therapeutic efficacy was assessed using a xenograft renal cancer mouse model (MRI-H-121 xenograft) upon administration of the different plitidepsin formulations at maximum tolerated multiple doses (0.20 and 0.25 mg/kg for Cremophor® and copolymer formulations, respectively).
Results
High plitidepsin loading efficiencies were obtained for both copolymer formulations. Considering pharmacokinetics, PEG-b-PBLG formulation showed lower plasma clearance, associated with higher AUC and Cmax than Cremophor® or PTMC-b-PGA formulations. Additionally, the PEG-b-PBLG formulation presented lower liver and kidney accumulation compared with the other two formulations, associated with an equivalent tumor distribution. Regarding the anticancer activity, all formulations elicited similar efficacy profiles, as compared to the Cremophor® formulation, successfully reducing tumor growth rate.
Conclusions
Although the nanoparticle formulations present equivalent anticancer activity, compared to the Cremophor® formulation, they show improved biodistribution profiles, presenting novel tools for future plitidepsin-based therapies.
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Abbreviations
- CEW:
-
Cremophor®:Ethanol:Water (15:15:70 v/v%)
- CLp:
-
Clearance
- Cmax:
-
Maximum concentration
- CRE:
-
Cremophor®
- FWR:
-
Feed Weight Ratio
- HPLC:
-
High performance liquid chromatography
- iv.:
-
Intravenous
- LC:
-
Loading content
- LE:
-
Loading efficiency
- MTD:
-
Maximum tolerated dose
- PEG-b-PBLG:
-
Poly(ethylene glycol)-block-poly(γ-benzyl-L-glutamate)
- PTMC-b-PGA:
-
Poly(trimethylene carbonate)-block-poly(glutamic acid)
- SD:
-
Standard deviation
- t1/2:
-
Terminal half-life time
- Vdss:
-
Apparent volume of distribution at steady state
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Acknowledgments AND DISCLOSURES
This work was supported by funding from the European Commission under the seventh framework within the frame of the NanoTher project (Integration of novel NANOparticle based technology for THERapeutics and diagnosis of different types of cancer CP-IP 213631–2).
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Oliveira, H., Thevenot, J., Garanger, E. et al. Nano-Encapsulation of Plitidepsin: In Vivo Pharmacokinetics, Biodistribution, and Efficacy in a Renal Xenograft Tumor Model. Pharm Res 31, 983–991 (2014). https://doi.org/10.1007/s11095-013-1220-3
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DOI: https://doi.org/10.1007/s11095-013-1220-3