ABSTRACT
Purpose
Both combretastatin A-4 (CA-4) and doxorubicin (DOX) was loaded in different form in a targeted nanomedicine in order to achieve the active delivery of these two drugs followed by sequentially suppressing tumor vasculature and tumor cells.
Methods
Octreotide-modified stealth liposomes loaded with CA-4 and DOX (Oct-L[CD]) were prepared and characterized. Then in vitro release, cellular uptake, in vitro antitumor effect, pharmacokinetics, in vivo sequential killing effect, in vivo antitumor efficacy against somatostatin receptor (SSTR) positive cells, as well as the action mechanism of such system, were studied.
Results
A rapid release of CA-4 followed by a slow release of DOX was observed in vitro. The active targeted liposomes Oct-L[CD] showed a specific cellular uptake through ligand-receptor interaction and a higher antitumor effect in vitro against SSTR-positive cell line. The in vivo sequential killing effect of such system was found as evidenced by the fast inhibition of blood vessels and slow apoptosis-inducing of tumor cells. Oct-L[CD] also exhibited the strongest antitumor effect in MCF-7 subcutaneous xenograft models.
Conclusions
Oct-modified co-delivery system may have great potential as an effective carrier for cancer therapy.
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Abbreviations
- AUC:
-
area under the plasma concentration-time curve
- CA-4:
-
combretastatin A-4
- CA-4P:
-
combretastatin A-4 phosphate
- DDS:
-
drug delivery system
- DOX:
-
doxorubicin
- DSPE-PEG (PEG Mw 2000):
-
1.2-distearoyl-sn-glycero-3-phosphoethanola mine-N-[poly(ethylene-glycol)]
- DSPE-PEG-Oct:
-
conjugate of octreotide with DSPE-PEG
- EPC:
-
egg phosphatidylcholine
- FBS:
-
fetal bovine serum
- IC50 :
-
50% inhibitory concentration
- K :
-
elimination rate constant
- L[C]:
-
liposomes encapsulating CA-4
- L[CD]:
-
liposomes encapsulating both CA-4 and DOX
- L[D]:
-
liposomes encapsulating DOX
- Oct:
-
octreotide
- Oct-L[CD]:
-
octreotide-targeted liposomes encapsulating both CA-4 and DOX
- PBS:
-
phosphate buffered saline
- PD:
-
pharmacodynamics
- PDI:
-
polydispersity index
- PK:
-
pharmacokinetics
- SRB:
-
sulforhodamine B
- SSTR2:
-
somatostatin receptor subtype 2
- SSTRs:
-
somatostatin receptors
- T1/2 :
-
plasma half-life
- TEM:
-
transmission electron microscope
- VDAs:
-
vascular disrupting agents
- VEGF:
-
vascular endothelial growth factor
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ACKNOWLEDGMENTS AND DISCLOSURES
This study was supported by the National Nature Science Foundation (No.81130059), National Basic Research Program of China (No. 2009CB930300).
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Dai, W., **, W., Zhang, J. et al. Spatiotemporally Controlled Co-delivery of Anti-vasculature Agent and Cytotoxic Drug by Octreotide-Modified Stealth Liposomes. Pharm Res 29, 2902–2911 (2012). https://doi.org/10.1007/s11095-012-0797-2
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DOI: https://doi.org/10.1007/s11095-012-0797-2