Summary
The ability of cancer cells to become simultaneously resistant to different drugs, a trait known as multidrug resistance, remains a major obstacle for successful anticancer therapy. One major mechanism of resistance involves cellular drug efflux by expression of P-glycoprotein (P-gp), a membrane transporter with a wide variety of substrates. Anthracyclines are especially prone to induction of resistance by the P-gp mechanism. P-gp mediated resistance is often confronted by use of P-gp inhibitors, synthesis of novel analogs, or conjugating drugs to macromolecular carriers in order to circumvent the efflux mechanism. In this report, the effect of free and Elastin-like polypeptide (ELP) bound doxorubicin (Dox) on the viability of sensitive (MES-SA and MCF-7) and multidrug resistant (MES-SA/Dx5 and NCI/ADR-RES) human carcinoma cells was studied in vitro. The resistant MES-SA/Dx5 cells demonstrated about 70 times higher resistance to free Dox than the sensitive MES-SA cells, and the NCI/ADR-RES cells were about 30 fold more resistant than the MCF-7 cells. However, the ELP-bound Dox was equally cytotoxic in both sensitive and resistant cell lines. The ELP-bound Dox was shown to accumulate in MES-SA/Dx5 cells, as opposed to free Dox, which was rapidly pumped out by the P-gp transporter. Since ELP is a thermally responsive carrier, the effect of hyperthermia on the cytotoxicity of the ELP-Dox conjugate was investigated. Both cytotoxicity and apoptosis were enhanced by hyperthermia in the Dox resistant cells. The results suggest that ELP-Dox conjugates may provide a means to thermally target solid tumors and to overcome drug resistance in cancer cells.
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Abbreviations
- ABC:
-
ATP binding cassette
- AUC:
-
area under curve
- BSA:
-
bovine serum albumin
- Dnr:
-
daunorubicin
- Dox:
-
doxorubicin
- ELP:
-
elastin-like polypeptide
- EPR:
-
enhanced permeability and retention
- HPLC:
-
high pressure liquid chromatography
- HPMA:
-
N-(2-hydroxypropyl)methacrylamide
- MDR:
-
multidrug resistance
- PBS:
-
phosphate buffered physiological saline
- PE:
-
phycoerythrin
- PFA:
-
paraformaldehyde
- P-gp:
-
P-glycoprotein
- Tt :
-
transition temperature
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Acknowledgements
This work was partially supported by the Wendy Will Case Cancer Fund grant to Drazen Raucher and The Welch Foundation (Houston, TX) grant to Waldemar Priebe.
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Novelty and Impact: This work represents the first demonstration that ELP-based drug delivery vectors can bypass the P-gp resistance mechanism. This manuscript lays the groundwork for the use of ELP for thermally targeted drug delivery to drug resistant solid tumors.
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Bidwell, G.L., Davis, A.N., Fokt, I. et al. A thermally targeted elastin-like polypeptide-doxorubicin conjugate overcomes drug resistance. Invest New Drugs 25, 313–326 (2007). https://doi.org/10.1007/s10637-007-9053-8
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DOI: https://doi.org/10.1007/s10637-007-9053-8