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Sarkar K, Torregrossa-Allen SE, Elzey BD, Narayanan S, Langer MP, Durm GA, Won YY. Effect of Paclitaxel Stereochemistry on X-ray-Triggered Release of Paclitaxel from CaWO 4/Paclitaxel-Coloaded PEG-PLA Nanoparticles. Mol Pharm 2022; 19:2776-2794. [PMID: 35834797 DOI: 10.1021/acs.molpharmaceut.2c00148] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For many locally advanced tumors, the chemotherapy-radiotherapy (CT-RT) combination ("chemoradiation") is currently the standard of care. Intratumoral (IT) CT-based chemoradiation has the potential to overcome the limitations of conventional systemic CT-RT (side effects). For maximizing the benefits of IT CT-RT, our laboratory has previously developed a radiation-controlled drug release formulation, in which anticancer drug paclitaxel (PTX) and radioluminescent CaWO4 (CWO) nanoparticles (NPs) are co-encapsulated with poly(ethylene glycol)-poly(lactic acid) (PEG-PLA) block copolymers ("PEG-PLA/CWO/PTX NPs"). These PEG-PLA/CWO/PTX NPs enable radiation-controlled release of PTX and are capable of producing sustained therapeutic effects lasting for at least one month following a single IT injection. The present article focuses on discussing our recent finding about the effect of the stereochemical structure of PTX on the efficacy of this PEG-PLA/CWO/PTX NP formulation. Stereochemical differences in two different PTX compounds ("PTX-S" from Samyang Biopharmaceuticals and "PTX-B" from Biotang) were characterized by 2D heteronuclear/homonuclear NMR, Raman spectroscopy, and circular dichroism measurements. The difference in PTX stereochemistry was found to significantly influence their water solubility (WS); PTX-S (WS ≈ 4.69 μg/mL) is about 19 times more water soluble than PTX-B (WS ≈ 0.25 μg/mL). The two PTX compounds showed similar cancer cell-killing performances in vitro when used as free drugs. However, the subtle stereochemical difference significantly influenced their X-ray-triggered release kinetics from the PEG-PLA/CWO/PTX NPs; the more water-soluble PTX-S was released faster than the less water-soluble PTX-B. This difference was manifested in the IT pharmacokinetics and eventually in the survival percentages of test animals (mice) treated with PEG-PLA/CWO/PTX NPs + X-rays in an in vivo human tumor xenograft study; at short times (<1 month), concurrent PEG-PLA/CWO/PTX-S NPs produced a greater tumor-suppression effect, whereas PEG-PLA/CWO/PTX-B NPs had a longer-lasting radio-sensitizing effect. This study demonstrates the importance of the stereochemistry of a drug in a therapy based on a controlled release formulation.
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Affiliation(s)
- Kaustabh Sarkar
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | | | - Bennett D Elzey
- Purdue University Center of Cancer Research, West Lafayette, Indiana 47907, United States.,Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sanjeev Narayanan
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mark P Langer
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202, United States
| | - Gregory A Durm
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, United States
| | - You-Yeon Won
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.,Purdue University Center of Cancer Research, West Lafayette, Indiana 47907, United States
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