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Bownik A, Pawlik-Skowrońska B. Responses of RTgill-W1 cells to cyanobacterial metabolites microcystin-LR, anabaenopeptin-A, cylindrospermopsin, their binary and ternary mixtures. Toxicon 2024; 249:108059. [PMID: 39117156 DOI: 10.1016/j.toxicon.2024.108059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 07/18/2024] [Accepted: 08/05/2024] [Indexed: 08/10/2024]
Abstract
The aim of our study was to investigate the effects of cyanobacterial metabolites: microcystin-LR (MC-LR) anabaenopeptin-A (ANA-A), cylindrospermopsin (CYL), their binary and ternary mixtures on rainbow trout (Oncorhynchus mykiss) gill (RTgill-W1) cell line. We determined the following cell parameters: Hoechst and propidium iodide (PI) double staining, intracellular ATP level with luminometric assay, glutathione level with ThiolTracker Violet®- glutathione detection reagent and cytoskeletal F-actin fluorescence. The results showed that although reduction of Hoechst fluorescence was observed in both binary and ternary combinations of cyanobacterial metabolites, the mixture of MC-LR+ANA-A+CYL was the most potent inhibitor (EC50=148 nM). PI fluorescence and ATP levels were more increased in the cells exposed to the mixtures than those exposed to the individual metabolites with synergistic toxic changes suggesting apoptosis as the mechanism of cell death. Reduced glutathione level was also decreased in cells exposed both to single metabolites and their mixtures with the highest decrease and synergistic effects at 334 nM MC-LR+334 nM ANA-A+ 334 nM CYL suggesting induction oxidative stress by the tested compounds. Reduction of F-actin fluorescence was found in the cells from all of the groups exposed to individual metabolites and their mixtures, however the highest level of inhibition showed the binary MC-LR+CYL and the ternary MC-LR+ANA-A+CYL with synergistic interactions. The study suggests that in natural conditions fish gill cells may be very sensitive to individual cyanobacterial metabolites and more prone to their binary and ternary mixtures.
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Affiliation(s)
- Adam Bownik
- Department of Hydrobiology and Protection of Ecosystems, University of Life Sciences in Lublin, Dobrzańskiego 37, 20-262, Lublin, Poland.
| | - Barbara Pawlik-Skowrońska
- Department of Hydrobiology and Protection of Ecosystems, University of Life Sciences in Lublin, Dobrzańskiego 37, 20-262, Lublin, Poland
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Li L, Tavallaie MS, Xie F, Xia Y, Liang Y, Jiang F, Fu L. Identification of lipid-like salicylic acid-based derivatives as potent and membrane-permeable PTP1B inhibitors. Bioorg Chem 2019; 93:103296. [PMID: 31585268 DOI: 10.1016/j.bioorg.2019.103296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/11/2019] [Accepted: 09/16/2019] [Indexed: 12/29/2022]
Abstract
Developing protein tyrosine phosphatase-1B (PTP1B) inhibitors is an important strategy to treat type 2 diabetes mellitus (T2DM). Most existing ionic PTP1B inhibitors aren't of clinical useful due to their low cell-permeability, however. Herein, we introduced a series of lipid-like acid-based (salicylic acid) modules to prepare PTP1B inhibitors, and demonstrated a marked improvement of cell-permeability while maintaining excellent PTP1B inhibitory activity (e.g. compound B12D, IC50 = 0.37 μM against PTP1B and Papp = 1.5 × 10-6 cm/s). We believe that this strategy can be widely utilized to modify potent lead compounds with low cell-permeability.
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Affiliation(s)
- Liang Li
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China
| | - Mojdeh S Tavallaie
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China
| | - Fangzhou Xie
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China
| | - Yu Xia
- Viva Biotech (Shanghai) Limited, Shanghai 201203, China
| | - Yaoyao Liang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China
| | - Faqin Jiang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China
| | - Lei Fu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University (SJTU), 800 Dongchuan Road, Shanghai 200240, China.
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Ge SS, Chen B, Wu YY, Long QS, Zhao YL, Wang PY, Yang S. Current advances of carbene-mediated photoaffinity labeling in medicinal chemistry. RSC Adv 2018; 8:29428-29454. [PMID: 35547988 PMCID: PMC9084484 DOI: 10.1039/c8ra03538e] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/07/2018] [Indexed: 12/21/2022] Open
Abstract
Photoaffinity labeling (PAL) in combination with a chemical probe to covalently bind its target upon UV irradiation has demonstrated considerable promise in drug discovery for identifying new drug targets and binding sites. In particular, carbene-mediated photoaffinity labeling (cmPAL) has been widely used in drug target identification owing to its excellent photolabeling efficiency, minimal steric interference and longer excitation wavelength. Specifically, diazirines, which are among the precursors of carbenes and have higher carbene yields and greater chemical stability than diazo compounds, have proved to be valuable photolabile reagents in a diverse range of biological systems. This review highlights current advances of cmPAL in medicinal chemistry, with a focus on structures and applications for identifying small molecule–protein and macromolecule–protein interactions and ligand-gated ion channels, coupled with advances in the discovery of targets and inhibitors using carbene precursor-based biological probes developed in recent decades. Photoaffinity labeling (PAL) in combination with a chemical probe to covalently bind its target upon UV irradiation has demonstrated considerable promise in drug discovery for identifying new drug targets and binding sites.![]()
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Affiliation(s)
- Sha-Sha Ge
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Biao Chen
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Yuan-Yuan Wu
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Qing-Su Long
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Yong-Liang Zhao
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Pei-Yi Wang
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
| | - Song Yang
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering
- Key Laboratory of Green Pesticide and Agricultural Bioengineering
- Ministry of Education
- Center for R&D of Fine Chemicals of Guizhou University
- Guiyang 550025
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Murphy DJ, Ou Y, Euler DH, Wessner K, Adamski S, Luo B, Wesolowski GA, Vogel R, Glantschnig H, Lubbers LS, Carroll SS, Lai MT. Determination of in Vivo Enzyme Occupancy Utilizing Inhibitor Dissociation Kinetics. J Am Chem Soc 2015; 137:11230-3. [PMID: 26301491 DOI: 10.1021/jacs.5b06518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
During drug discovery, assessment of in vivo target occupancy by therapeutic candidates is often required for predicting clinical efficacy. Current strategies for determining target occupancy include using radiolabeled or irreversible surrogates, which can be technically challenging, and the results are often not sufficiently quantitative. We developed a straightforward method by applying slow-dissociation kinetics to quantitatively determine enzyme occupancy without using specialized reagents. We applied this method to determine occupancy of Cathepsin K inhibitors in bone tissues harvested from rabbit femurs. Tissues from dosed animals were harvested, flash frozen, lysed, then analyzed by a jump-dilution assay with substrate. The rate of substrate turnover was monitored continuously until reaching steady state and progress curves were fit with the equation [product] = vst + ((vi - vs)/kobs)(1 - exp(-kobst)). The initial rate vi represents the residual activity of the enzyme before inhibitor dissociation; vs is the reaction rate after dissociation of the inhibitor. Occupancy is derived from the ratio of vi/vs. A significant benefit of the method is that data from both the occupied and unoccupied states are obtained in the same assay under identical conditions, which provides greater consistency between studies. The Cat K inhibitor MK-0674 (in vitro IC50 1 nM) was tested in young rabbits (<6 month old) and showed a dose-dependent increase in occupancy, reaching essentially complete occupancy at 1.0 mg/kg. In addition the method enables measurement of the total Cat K in the target tissue. Results confirmed complete occupancy even as the osteoclasts responded to higher doses with increased enzyme production.
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Affiliation(s)
- Dennis J Murphy
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Yangsi Ou
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Danielle H Euler
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Keith Wessner
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Sharon Adamski
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Bin Luo
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Gregg A Wesolowski
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Robert Vogel
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Helmut Glantschnig
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Laura S Lubbers
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Stephen S Carroll
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
| | - Ming-Tain Lai
- In Vitro Pharmacology, ‡Bone Biology, and §In Vivo Pharmacology, Merck Research Laboratories , West Point, Pennsylvania 19486, United States
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Stanford SM, Ahmed V, Barrios AM, Bottini N. Cellular biochemistry methods for investigating protein tyrosine phosphatases. Antioxid Redox Signal 2014; 20:2160-78. [PMID: 24294920 PMCID: PMC3995294 DOI: 10.1089/ars.2013.5731] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
SIGNIFICANCE The protein tyrosine phosphatases (PTPs) are a family of proteins that play critical roles in cellular signaling and influence many aspects of human health and disease. Although a wealth of information has been collected about PTPs since their discovery, many questions regarding their regulation and function still remain. CRITICAL ISSUES Of particular importance are the elucidation of the biological substrates of individual PTPs and understanding of the chemical and biological basis for temporal and spatial resolution of PTP activity within a cell. RECENT ADVANCES Drawing from recent advances in both biology and chemistry, innovative approaches have been developed to study the intracellular biochemistry and physiology of PTPs. We provide a summary of PTP-tailored techniques and approaches, emphasizing methodologies to study PTP activity within a cellular context. We first provide a discussion of methods for identifying PTP substrates, including substrate-trapping mutants and synthetic peptide libraries for substrate selectivity profiling. We next provide an overview of approaches for monitoring intracellular PTP activity, including a discussion of mechanistic-based probes, gel-based assays, substrates that can be used intracellularly, and assays tied to cell growth. Finally, we review approaches used for monitoring PTP oxidation, a key regulatory pathway for these enzymes, discussing the biotin switch method and variants of this approach, along with affinity trapping techniques and probes designed to detect PTP oxidation. FUTURE DIRECTIONS Further development of approaches to investigate the intracellular PTP activity and functions will provide specific insight into their mechanisms of action and control of diverse signaling pathways.
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Affiliation(s)
- Stephanie M Stanford
- 1 Division of Cellular Biology, La Jolla Institute for Allergy and Immunology , La Jolla, California
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Forman HJ, Maiorino M, Ursini F. Signaling functions of reactive oxygen species. Biochemistry 2010. [PMID: 20050630 DOI: 10.1021/bi.9020378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We review signaling by reactive oxygen species, which is emerging as a major physiological process. However, among the reactive oxygen species, H(2)O(2) best fulfills the requirements of being a second messenger. Its enzymatic production and degradation, along with the requirements for the oxidation of thiols by H(2)O(2), provide the specificity for time and place that are required in signaling. Both thermodynamic and kinetic considerations suggest that among possible oxidation states of cysteine, formation of sulfenic acid derivatives or disulfides can be relevant as thiol redox switches in signaling. In this work, the general constraints that are required for protein thiol oxidation by H(2)O(2) to be fast enough to be relevant for signaling are discussed in light of the mechanism of oxidation of the catalytic cysteine or selenocysteine in thiol peroxidases. While the nonenzymatic reaction between thiol and H(2)O(2) is, in most cases, too slow to be relevant in signaling, the enzymatic catalysis of thiol oxidation by these peroxidases provides a potential mechanism for redox signaling.
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Affiliation(s)
- Henry Jay Forman
- University of California, 5200 North Lake Road, Merced, California 95344, USA.
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Forman HJ, Maiorino M, Ursini F. Signaling functions of reactive oxygen species. Biochemistry 2010; 49:835-42. [PMID: 20050630 DOI: 10.1021/bi9020378] [Citation(s) in RCA: 563] [Impact Index Per Article: 40.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We review signaling by reactive oxygen species, which is emerging as a major physiological process. However, among the reactive oxygen species, H(2)O(2) best fulfills the requirements of being a second messenger. Its enzymatic production and degradation, along with the requirements for the oxidation of thiols by H(2)O(2), provide the specificity for time and place that are required in signaling. Both thermodynamic and kinetic considerations suggest that among possible oxidation states of cysteine, formation of sulfenic acid derivatives or disulfides can be relevant as thiol redox switches in signaling. In this work, the general constraints that are required for protein thiol oxidation by H(2)O(2) to be fast enough to be relevant for signaling are discussed in light of the mechanism of oxidation of the catalytic cysteine or selenocysteine in thiol peroxidases. While the nonenzymatic reaction between thiol and H(2)O(2) is, in most cases, too slow to be relevant in signaling, the enzymatic catalysis of thiol oxidation by these peroxidases provides a potential mechanism for redox signaling.
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Affiliation(s)
- Henry Jay Forman
- University of California, 5200 North Lake Road, Merced, California 95344, USA.
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