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Pang W, Li B, Wu Y, Tian S, Zhang Y, Yang J. Optimization of degradation behavior and conditions for the protease K of polylactic acid films by simulation. Int J Biol Macromol 2023; 253:127496. [PMID: 37858641 DOI: 10.1016/j.ijbiomac.2023.127496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/09/2023] [Accepted: 10/15/2023] [Indexed: 10/21/2023]
Abstract
With global enforcement of plastic bans and restrictions, the biodegradable plastic, e.g., polylactic acid (PLA), has been extensively employed as a primary substitute for traditional petroleum-based plastics. However, the growing problem associated with PLA waste accumulation is posing grand environmental challenges. In addition, although PLA has the degrading property under natural conditions, the degradation process takes too long and the degradation products cannot be recycled. In this context, enzymatic degradation of PLA arouses great attention in scientific communities. This study aims at selecting the most cost-effective protease from various enzymes and optimizing the enzymolysis conditions towards the degradation of PLA. We will demonstrate that under an optimal temperature of 45 °C, a pH vale of 11, and an enzyme concentration of 0.6 mg mL-1, the protease K would achieve a remarkable degradation efficiency (> 99 %) for PLA films within just 50 min. Finally, molecular dynamics (MD) simulation and molecular docking studies reveal the mechanism behind the protease-induced PLA degradation, providing a promising direction for waste treatment and resource utilization for future biodegradable plastics.
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Affiliation(s)
- Wenlong Pang
- Institute of Circular Economy, Beijing University of Technology, Beijing, 100022, China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100022, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Bin Li
- Institute of Circular Economy, Beijing University of Technology, Beijing, 100022, China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100022, China
| | - Yufeng Wu
- Institute of Circular Economy, Beijing University of Technology, Beijing, 100022, China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100022, China.
| | - Shaonan Tian
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yu Zhang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Jun Yang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Ahmed NS, Samec M, Liskova A, Kubatka P, Saso L. Tamoxifen and oxidative stress: an overlooked connection. Discov Oncol 2021; 12:17. [PMID: 35201439 PMCID: PMC8777555 DOI: 10.1007/s12672-021-00411-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 03/31/2021] [Indexed: 02/06/2023] Open
Abstract
Tamoxifen is the gold standard drug for the treatment of breast cancer in pre and post-menopausal women. Its journey from a failing contraceptive to a blockbuster is an example of pharmaceutical innovation challenges. Tamoxifen has a wide range of pharmacological activities; a drug that was initially thought to work via a simple Estrogen receptor (ER) mechanism was proven to mediate its activity through several non-ER mechanisms. Here in we review the previous literature describing ER and non-ER targets of tamoxifen, we highlighted the overlooked connection between tamoxifen, tamoxifen apoptotic effects and oxidative stress.
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Affiliation(s)
- Nermin S Ahmed
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo, 11835, Egypt.
| | - Marek Samec
- Department of Obstetrics and Gynecology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 03601, Martin, Slovakia
| | - Alena Liskova
- Department of Obstetrics and Gynecology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 03601, Martin, Slovakia
| | - Peter Kubatka
- Department of Medical Biology, Department of Experimental Carcinogenesis (Biomedical Center Martin, Division of Oncology), Jessenius Faculty of Medicine, Comenius University in Bratislava, Malá Hora 4, 03601, Martin, Slovak Republic
| | - Luciano Saso
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University, P.le Aldo Moro 5, 00185, Rome, Italy
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