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Pioglitazone modulates doxorubicin resistance in a in vivo model of drug resistant osteosarcoma xenograft

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Abstract

Osteosarcoma has been reported with treatment failure in up to 40% of cases. Our laboratory had identified genes involved in the PPARγ pathway to be associated with doxorubicin (DOX) resistance. We hence used PPARγ agonist pioglitazone (PIO) to modulate DOX resistance. DOX-resistant cell line (143B-DOX) was developed by gradient exposure to DOX. The cytotoxicity to PIO and in combination with DOX was assayed in vitro, followed by HPLC to estimate the metabolites of PIO in the presence of microsomes (HLMs). Gene expression studies revealed the mechanism behind the cytotoxicity of PIO. Further, the effects were evaluated in mice bearing 143B-DOX tumors treated either with PIO (20 mg/kg/p.o or 40 mg/kg/p.o Q1D) alone or in combination with DOX (0.5 mg/kg/i.p Q2W). 143B-DOX was 50-fold resistant over parental cells. While PIO did not show any activity on its own, the addition of HLMs to the cells in culture showed over 80% cell kill within 24 h, possibly due to the metabolites of PIO as determined by HPLC. In combination with DOX, PIO had shown synergistic activity. Additionally, cytotoxicity assay in the presence of HLMs revealed that PIO on its own showed promising activity compared to its metabolites—hydroxy pioglitazone and keto pioglitazone. In vivo studies demonstrated that treatment with 40 mg/kg/p.o PIO alone showed significant activity, followed by a combination with DOX. Gene expression studies revealed that PIO could modulate drug resistance by downregulating MDR1 and IL8. Our study suggests that PIO can modulate DOX resistance in osteosarcoma cells.

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Acknowledgments

The authors wish to thank M. Vijayavel for his technical assistance.

Funding

Aparna Natarajan stipend [JRF and SRF] was supported by the Department of Biotechnology (DBT), Government of India (BT/PR1457/2011).

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All the in vitro and in vivo data were generated in-house and no paper mill was used. TR conceptualized, supervised the study, and analyzed the data. AN carried out all the in vitro, in vivo, and HPLC experiments, analyzed the data, and drafted the manuscript. BR performed and supervised the animal studies at the departmental animal house facility. GG supervised the HPLC study. SJ assisted with HPLC experiments at the departmental proteomics facility. SS evaluated the H and E slides. All authors discussed the results and contributed and approved the final manuscript.

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Correspondence to Thangarajan Rajkumar.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants performed by any of the authors.

All animal studies were carried out with prior approval from the Institutional Animal Ethics Committee (IAEC) of Cancer Institute (W.I.A), India. Care of animals complied according to CPCSEA (Committee for the purpose of Control and Supervision of Experiments on Animals) guidelines, Government of India.

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Natarajan, A., Ramachandran, B., Gopisetty, G. et al. Pioglitazone modulates doxorubicin resistance in a in vivo model of drug resistant osteosarcoma xenograft. Naunyn-Schmiedeberg's Arch Pharmacol 394, 361–371 (2021). https://doi.org/10.1007/s00210-020-01982-3

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  • DOI: https://doi.org/10.1007/s00210-020-01982-3

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