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Wen X, Doherty C, Thompson LE, Kim C, Buckley BS, Jaimes EA, Joy MS, Aleksunes LM. Determination of unbound platinum concentrations in human plasma using ultrafiltration and precipitation methods. J Pharmacol Toxicol Methods 2024; 128:107535. [PMID: 38955285 DOI: 10.1016/j.vascn.2024.107535] [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: 04/18/2024] [Revised: 06/23/2024] [Accepted: 06/28/2024] [Indexed: 07/04/2024]
Abstract
Quantification of the unbound portion of platinum (Pt) in human plasma is important for assessing the pharmacokinetics of the chemotherapeutic drug cisplatin. In this study, we sought to compare the recovery of unbound Pt using Nanosep® filters to 1) traditional filters (Centrifree®, Centrisart®, Amicon®) or trichloroacetic acid (TCA) protein precipitation, and 2) unbound, bound, and total Pt concentrations in clinical specimens. For the tested filters, the impact of 1) molecular weight cut-offs, 2) centrifugation force, and 3) total Pt concentration on Pt binding in human plasma was evaluated. Pt was quantified using inductively coupled-plasma mass spectrometry. In human plasma spiked with 0.9 μg/mL Pt, the percent of unbound Pt increased at higher centrifugation speeds. By comparison, the percent of unbound Pt was highest (42.1%) following TCA protein precipitation. When total Pt was ≤0.9 μg/mL, unbound Pt (∼20-30%) was consistent across filters. Conversely, when plasma was spiked with Pt exceeding 0.9 μg/mL, the percent of unbound Pt increased from 36.5 to 48% using ultrafiltration, compared to 63.4% to 79% with TCA precipitation. In patients receiving cisplatin-containing chemotherapy, the fraction of unbound Pt at concentrations exceeding 0.9 μg/mL ranged between 35 and 90%. Moreover, the unbound fraction of Pt in plasma correlated with the concentration of unbound (R2 = 0.738) and total Pt (R2 = 0.335). In summary, this study demonstrates that 1) the percent of unbound Pt is influenced by total and unbound Pt levels in vitro and in clinical specimens, and 2) ultrafiltration with Nanosep® filters is a feasible method for quantifying unbound Pt concentrations in human plasma.
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Affiliation(s)
- Xia Wen
- Dept of Pharmacology and Toxicology, United States of America; Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States of America
| | - Cathleen Doherty
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States of America
| | - Lauren E Thompson
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, School of Medicine Division of Nephrology, Colorado Cancer Center, University of Colorado, Aurora, CO, United States of America
| | - Christine Kim
- Dept of Pharmacology and Toxicology, United States of America
| | - Brian S Buckley
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States of America
| | - Edgar A Jaimes
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, United States of America
| | - Melanie S Joy
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, School of Medicine Division of Nephrology, Colorado Cancer Center, University of Colorado, Aurora, CO, United States of America
| | - Lauren M Aleksunes
- Dept of Pharmacology and Toxicology, United States of America; Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States of America; Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, United States of America.
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Yang T, Zhang S, Yuan H, Wang Y, Cai L, Chen H, Wang X, Song D, Wang X, Guo Z, Wang X. Platinum-Based TREM2 Inhibitor Suppresses Tumors by Remodeling the Immunosuppressive Microenvironment. Angew Chem Int Ed Engl 2023; 62:e202213337. [PMID: 36259513 DOI: 10.1002/anie.202213337] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Indexed: 11/07/2022]
Abstract
Triggering receptor expressed on myeloid cells-2 (TREM2) is a key pro-tumorigenic marker of tumor-infiltrating macrophages, showing potent immunosuppressive activity in tumor microenvironment. A platinum(IV) complex OPA derived from oxaliplatin (OP) and artesunate (ART) exhibited direct cytotoxicity against human colon cancer cells and immunomodulatory activity to inhibit TREM2 on macrophages in vitro and vivo. Furthermore, OPA deterred the tumor growth in mouse models bearing MC38 colorectal tumor by reducing the number of CD206+ and CX3 CR1+ immunosuppressive macrophages; it also promoted the expansion and infiltration of immunostimulatory dendritic, cytotoxic T, and natural killer cells. OPA is the first small-molecular TREM2 inhibitor capable of relieving immunosuppressive tumor microenvironment and enhancing chemical anticancer efficiency of a platinum drug, thus showing typical characteristics of a chemoimmunotherapeutic agent.
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Affiliation(s)
- Tao Yang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Chemistry and Biomedicine Innovation Center, Nanjing University, Nanjing, 210023, P. R. China
| | - Shuren Zhang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Chemistry and Biomedicine Innovation Center, Nanjing University, Nanjing, 210023, P. R. China
| | - Hao Yuan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Ying Wang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, P. R. China
| | - Linxiang Cai
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, P. R. China
| | - Hanhua Chen
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, P. R. China
| | - Xiaoyu Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Dongfan Song
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Xiaohui Wang
- Institute of Chemical Biology and Functional Molecules, State Key Laboratory of Materials-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Zijian Guo
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Chemistry and Biomedicine Innovation Center, Nanjing University, Nanjing, 210023, P. R. China
| | - Xiaoyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, P. R. China
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Versatile analytical methodology for evaluation of drug-like properties of potentially multi-targeting anticancer metallodrugs. ANAL SCI 2022; 38:627-632. [DOI: 10.1007/s44211-022-00076-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/24/2021] [Indexed: 11/01/2022]
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