Chitosan Coated Polylactic Acid Nanoparticle-Mediated Combinatorial Delivery of Cisplatin and siRNA/Plasmid DNA Chemosensitizes Cisplatin-Resistant Human Ovarian Cancer Cells
Abstract
Development of resistance toward anticancer drugs results in ineffective therapy leading to increased mortality. Therefore, overriding resistance and restoring sensitivity to anticancer drugs will improve treatment efficacy and reduce mortality. While numerous mechanisms for drug resistance in cancer have previously been demonstrated, recent studies implicate a role for proteasome and the autophagy regulatory protein P62/SQSTM1 (P62) in contributing to drug resistance. Specifically, reduction in the expression of the β5 subunit of the proteasome and/or enhanced P62 protein expression is known to contribute to cancer drug resistance such as cisplatin (CDDP) in ovarian cancer cells. Therefore, we hypothesized that restoration of β5 expression and/or suppression of P62 protein expression in CDDP-resistant ovarian cancer cells will lead to restoration of sensitivity to CDDP and enhanced cell killing. To test our hypothesis we developed a biodegradable multifunctional nanoparticle (MNP) system that codelivered P62siRNA, β5 plasmid DNA, and CDDP and tested its efficacy in CDDP resistant 2008/C13 ovarian cancer cells. MNP consisted of CDDP loaded polylactic acid nanoparticle as inner core and cationic chitosan (CS) consisting of ionically linked P62siRNA (siP62) and/or β5 expressing plasmid DNA (pβ5) as the outer layer. The MNPs were spherical in shape with a hydrodynamic diameter in the range of 280-350 nm, and demonstrated encapsulation efficiencies of 82% and 78.5% for CDDP and siRNA respectively. MNPs efficiently protected the siRNA and showed superior serum stability compared to naked siRNA as measured by gel retardation and spectrophotometry assays. The MNPs successfully delivered siP62 and pβ5 to cause P62 knockdown and restoration of β5 expression in 2008/C13 cells. Combined delivery of siP62, pβ5, and CDDP using the MNPs resulted in a marked reduction in the IC50 value of CDDP in 2008/C13 cells from 125 ± 1.3 μM to 98 ± 0.6 μM (P < 0.05; 21.6% reduction) when compared to the reduction in the IC50 of CDDP observed in cells that had only siP62 delivered (IC50 = 106 ± 1.1 μM; P < 0.05; 15.2% reduction) or pβ5 delivered (IC50 = 115 ± 2.8 μM; 8% reduction) via MNPs. Finally, our studies showed that the CDDP resistance index in 2008/C13 cells was reduced from 4.62 for free CDDP to 3.62 for MNP treatment. In conclusion our study results demonstrated the efficacy of our MNP in overcoming CDDP resistance in ovarian cancer cells.
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sqstm1-knockout mice display reduced numbers of osteoclasts, cognitive impairment, and anxiety, associated with hyperphosphorylated MAPT/tau and neurofibrillary tangles.
“sqstm1-knockout mice display reduced numbers of osteoclasts as well as cognitive impairment and anxiety, associated with hyperphosphorylated MAPT/tau and neurofibrillary tangles [134–136].”
From Autophagy and ALS: mechanistic insights and therapeutic implications (2022) · cites this paper as [134]
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- Authors
- Babu, A., Wang, Q., Muralidharan, R., Shanker, M., Munshi, A., & Ramesh, R.
- Affiliations
- OU Health Stephenson Cancer Center (US)
- The University of Texas MD Anderson Cancer Center (US)
- University of Oklahoma Health Sciences Center (US)
- Corresponding author
- Ramesh, Rajagopal
- Venue
- Molecular Pharmaceutics
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-06-20
- Volume
- 11
- Issue
- 8
- Pages
- 2720-2733
- ISSN
- 1543-8384 (ISSN-L)
- 1543-8392
- OpenAlex
- W2075411705
- Cited by
- 94
- References
- 54
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 7 · 2023: 5 · 2022: 10 · 2021: 11 · 2020: 5 · 2019: 9 · 2018: 10 · 2017: 13 · 2016: 7 · 2015: 9
- FWCI
- 3.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Molecular Pharmaceutics (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (P20GM103639)
- Topics
- Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
- Keywords
- cisplatin resistance, ovarian cancer, p62, proteasome β5 subunit, siRNA delivery, plasmid DNA delivery, chitosan-coated nanoparticles, polylactic acid nanoparticles, nanoparticle-mediated gene delivery, chemosensitization, drug resistance reversal, combination therapy, serum stability
- MeSH terms
- Antineoplastic Agents, Cell Survival, Cisplatin, Female, Fluorescamine, Humans, Ovarian Neoplasms, Particle Size, Plasmids, Polyesters, Polymers, Drug Delivery Systems, RNA-Binding Proteins, Drug Resistance, Neoplasm, Lactic Acid, Inhibitory Concentration 50, RNA, Small Interfering, Cell Line, Tumor, Proteasome Endopeptidase Complex, Chitosan, Nanomedicine, Nanoparticles
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