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Choudhury C, Egleton JE, Butcher NJ, Russell AJ, Minchin RF. Small Molecule Inhibitors of Arylamine N-Acetyltransferase 1 Attenuate Cellular Respiration. ACS Pharmacol Transl Sci 2024; 7:2326-2332. [PMID: 39144569 PMCID: PMC11320739 DOI: 10.1021/acsptsci.4c00282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 07/07/2024] [Accepted: 07/11/2024] [Indexed: 08/16/2024]
Abstract
Arylamine N-acetyltransferase 1 (NAT1) expression has been shown to attenuate mitochondrial function, suggesting it is a promising drug target in diseases of mitochondrial dysfunction. Here, several second-generation naphthoquinones have been investigated as small molecule inhibitors of NAT1. The results show that the compounds inhibit both in vitro and in whole cells. A lead compound (Cmp350) was further investigated for its ability to alter mitochondrial metabolism in MDA-MB-231 cells. At concentrations that inhibited NAT1 by over 85%, no overt toxicity was observed. Moreover, the inhibitor decreased basal respiration and reserve respiratory capacity without affecting ATP production. Cells treated with Cmp350 were almost exclusively dependent on glucose as a fuel source. We postulate that Cmp350 is an excellent lead compound for the development of NAT1-targeted inhibitors as both experimental tools and therapeutics in the treatment of hypermetabolic diseases such as amyotrophic lateral sclerosis, cancer cachexia, and sepsis.
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Affiliation(s)
- Chandra Choudhury
- School
of Biomedical Sciences, The University of
Queensland, St Lucia, Brisbane, 4069 Queensland Australia
| | - James E. Egleton
- Department
of Chemistry, University of Oxford, 12A Mansfield Road, Oxford OX1 3TA, U.K.
| | - Neville J. Butcher
- School
of Biomedical Sciences, The University of
Queensland, St Lucia, Brisbane, 4069 Queensland Australia
| | - Angela J. Russell
- Department
of Chemistry, University of Oxford, 12A Mansfield Road, Oxford OX1 3TA, U.K.
- Department
of Pharmacology, University of Oxford, Mansfield Road, OX1 3QT Oxford, U.K.
| | - Rodney F. Minchin
- School
of Biomedical Sciences, The University of
Queensland, St Lucia, Brisbane, 4069 Queensland Australia
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Joshi A, Vishnu G K A, Sakorikar T, Kamal AM, Vaidya JS, Pandya HJ. Recent advances in biosensing approaches for point-of-care breast cancer diagnostics: challenges and future prospects. NANOSCALE ADVANCES 2021; 3:5542-5564. [PMID: 36133274 PMCID: PMC9417675 DOI: 10.1039/d1na00453k] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Accepted: 08/12/2021] [Indexed: 05/12/2023]
Abstract
Timely and accurate diagnosis of breast cancer is essential for efficient treatment and the best possible survival rates. Biosensors have emerged as a smart diagnostic platform for the detection of biomarkers specific to the onset, recurrence, and therapeutic drug monitoring of breast cancer. There have been exciting recent developments, including significant improvements in the validation, sensitivity, specificity, and integration of sample processing steps to develop point-of-care (POC) integrated micro-total analysis systems for clinical settings. The present review highlights various biosensing modalities (electrical, optical, piezoelectric, mass, and acoustic sensing). It provides deep insights into their design principles, signal amplification strategies, and comparative performance analysis. Finally, this review emphasizes the status of existing integrated micro-total analysis systems (μ-TAS) for personalized breast cancer therapeutics and associated challenges and outlines the approach required to realize their successful translation into clinical settings.
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Affiliation(s)
- Anju Joshi
- Department of Electronic Systems Engineering, Division of EECS, Indian Institute of Science Bangalore India
| | - Anil Vishnu G K
- Department of Electronic Systems Engineering, Division of EECS, Indian Institute of Science Bangalore India
- Centre for BioSystems Science and Engineering, Indian Institute of Science Bangalore India
| | - Tushar Sakorikar
- Department of Electronic Systems Engineering, Division of EECS, Indian Institute of Science Bangalore India
| | - Arif M Kamal
- Department of Electronic Systems Engineering, Division of EECS, Indian Institute of Science Bangalore India
| | - Jayant S Vaidya
- Division of Surgery and Interventional Science, University College London 4919 London UK
| | - Hardik J Pandya
- Department of Electronic Systems Engineering, Division of EECS, Indian Institute of Science Bangalore India
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Shende P, Prabhakar B, Patil A. Color changing sensors: A multimodal system for integrated screening. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.115687] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Feng L, Ning J, Tian X, Wang C, Zhang L, Ma X, James TD. Fluorescent probes for bioactive detection and imaging of phase II metabolic enzymes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213026] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Population variability of rhesus macaque (Macaca mulatta) NAT1 gene for arylamine N-acetyltransferase 1: Functional effects and comparison with human. Sci Rep 2019; 9:10937. [PMID: 31358821 PMCID: PMC6662693 DOI: 10.1038/s41598-019-47485-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 07/08/2019] [Indexed: 12/25/2022] Open
Abstract
Human NAT1 gene for N-acetyltransferase 1 modulates xenobiotic metabolism of arylamine drugs and mutagens. Beyond pharmacogenetics, NAT1 is also relevant to breast cancer. The population history of human NAT1 suggests evolution through purifying selection, but it is unclear whether this pattern is evident in other primate lineages where population studies are scarce. We report NAT1 polymorphism in 25 rhesus macaques (Macaca mulatta) and describe the haplotypic and functional characteristics of 12 variants. Seven non-synonymous single nucleotide variations (SNVs) were identified and experimentally demonstrated to compromise enzyme function, mainly through destabilization of NAT1 protein and consequent activity loss. One non-synonymous SNV (c.560G > A, p.Arg187Gln) has also been characterized for human NAT1 with similar effects. Population haplotypic and functional variability of rhesus NAT1 was considerably higher than previously reported for its human orthologue, suggesting different environmental pressures in the two lineages. Known functional elements downstream of human NAT1 were also differentiated in rhesus macaque and other primates. Xenobiotic metabolizing enzymes play roles beyond mere protection from exogenous chemicals. Therefore, any link to disease, particularly carcinogenesis, may be via modulation of xenobiotic mutagenicity or more subtle interference with cell physiology. Comparative analyses add the evolutionary dimension to such investigations, assessing functional conservation/diversification among primates.
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Comparative analysis of xenobiotic metabolising N-acetyltransferases from ten non-human primates as in vitro models of human homologues. Sci Rep 2018; 8:9759. [PMID: 29950659 PMCID: PMC6021393 DOI: 10.1038/s41598-018-28094-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 06/14/2018] [Indexed: 12/13/2022] Open
Abstract
Xenobiotic metabolising N-acetyltransferases (NATs) perform biotransformation of drugs and carcinogens. Human NAT1 is associated with endogenous metabolic pathways of cells and is a candidate drug target for cancer. Human NAT2 is a well-characterised polymorphic xenobiotic metabolising enzyme, modulating susceptibility to drug-induced toxicity. Human NATs are difficult to express to high purification yields, complicating large-scale production for high-throughput screens or use in sophisticated enzymology assays and crystallography. We undertake comparative functional investigation of the NAT homologues of ten non-human primates, to characterise their properties and evaluate their suitability as models of human NATs. Considering the amount of generated recombinant protein, the enzymatic activity and thermal stability, the NAT homologues of non-human primates are demonstrated to be a much more effective resource for in vitro studies compared with human NATs. Certain NAT homologues are proposed as better models, such as the NAT1 of macaques Macaca mulatta and M. sylvanus, the NAT2 of Erythrocebus patas, and both NAT proteins of the gibbon Nomascus gabriellae which show highest homology to human NATs. This comparative investigation will facilitate in vitro screens towards discovery and optimisation of candidate pharmaceutical compounds for human NAT isoenzymes, while enabling better understanding of NAT function and evolution in primates.
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da Rocha EP, Rodrigues HA, da Cunha EF, Ramalho TC. Probing kinetic and thermodynamic parameters as well as solvent and substituent effects on spectroscopic probes of 2-amino-1,4-naphthoquinone derivatives. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.09.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Treatment of Rats with Apocynin Has Considerable Inhibitory Effects on Arylamine N-Acetyltransferase Activity in the Liver. Sci Rep 2016; 6:26906. [PMID: 27242013 PMCID: PMC4886258 DOI: 10.1038/srep26906] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 05/09/2016] [Indexed: 12/23/2022] Open
Abstract
The effect of apocynin on the activity of arylamine N-acetyltransferases (NATs) in excised liver samples was examined using eighteen Sprague-Dawley rats. Three groups of six animals each were fed a normal diet alone or a treatment of 50 or 100 mg/kg/day of apocynin via gavages for eight (8) weeks. Chronic in vivo administration of apocynin led to significant (p < 0.001) reduction of in vitro liver NAT activity up to 93% as compared with untreated rats (18.80 ± 2.10 μmols p-anisidine/min/μg liver protein). In vitro exposure of untreated liver homogenates to apocynin led to a dose-dependent inhibition of NAT activity with IC50 = 0.69 ± 0.02 mM. In silico modelling of apocynin tautomers and radical species into human NAT crystal structures supported the hypothesis that thiol functionalities in NAT enzymes may be crucial in apocynin binding. The involvement of human NAT enzymes in different pathological conditions, such as cancer, has encouraged the research for selective NAT inhibitors in both humans and animal models with possible chemopreventive properties.
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Sim E, Abuhammad A, Ryan A. Arylamine N-acetyltransferases: from drug metabolism and pharmacogenetics to drug discovery. Br J Pharmacol 2014; 171:2705-25. [PMID: 24467436 PMCID: PMC4158862 DOI: 10.1111/bph.12598] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 08/15/2013] [Accepted: 08/26/2013] [Indexed: 12/12/2022] Open
Abstract
Arylamine N-acetyltransferases (NATs) are polymorphic drug-metabolizing enzymes, acetylating arylamine carcinogens and drugs including hydralazine and sulphonamides. The slow NAT phenotype increases susceptibility to hydralazine and isoniazid toxicity and to occupational bladder cancer. The two polymorphic human NAT loci show linkage disequilibrium. All mammalian Nat genes have an intronless open reading frame and non-coding exons. The human gene products NAT1 and NAT2 have distinct substrate specificities: NAT2 acetylates hydralazine and human NAT1 acetylates p-aminosalicylate (p-AS) and the folate catabolite para-aminobenzoylglutamate (p-abaglu). Human NAT2 is mainly in liver and gut. Human NAT1 and its murine homologue are in many adult tissues and in early embryos. Human NAT1 is strongly expressed in oestrogen receptor-positive breast cancer and may contribute to folate and acetyl CoA homeostasis. NAT enzymes act through a catalytic triad of Cys, His and Asp with the architecture of the active site-modulating specificity. Polymorphisms may cause unfolded protein. The C-terminus helps bind acetyl CoA and differs among NATs including prokaryotic homologues. NAT in Salmonella typhimurium supports carcinogen activation and NAT in mycobacteria metabolizes isoniazid with polymorphism a minor factor in isoniazid resistance. Importantly, nat is in a gene cluster essential for Mycobacterium tuberculosis survival inside macrophages. NAT inhibitors are a starting point for novel anti-tuberculosis drugs. Human NAT1-specific inhibitors may act in biomarker detection in breast cancer and in cancer therapy. NAT inhibitors for co-administration with 5-aminosalicylate (5-AS) in inflammatory bowel disease has prompted ongoing investigations of azoreductases in gut bacteria which release 5-AS from prodrugs including balsalazide.
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Affiliation(s)
- E Sim
- Faculty of Science Engineering and Computing, Kingston University, Kingston, UK; Department of Pharmacology, Oxford University, Oxford, UK
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Laurieri N, Kawamura A, Westwood IM, Varney A, Morris E, Russell AJ, Stanley LA, Sim E. Differences between murine arylamine N-acetyltransferase type 1 and human arylamine N-acetyltransferase type 2 defined by substrate specificity and inhibitor binding. BMC Pharmacol Toxicol 2014; 15:68. [PMID: 25432241 PMCID: PMC4258814 DOI: 10.1186/2050-6511-15-68] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 11/18/2014] [Indexed: 12/18/2022] Open
Abstract
Background The mouse has three arylamine N-acetyltransferase genes, (MOUSE)Nat1, (MOUSE)Nat2 and (MOUSE)Nat3. These are believed to correspond to (HUMAN)NAT1, (HUMAN)NAT2 and NATP in humans. (MOUSE)Nat3 encodes an enzyme with poor activity and human NATP is a pseudogene. (MOUSE)Nat2 is orthologous to (HUMAN)NAT1 and their corresponding proteins are functionally similar, but the relationship between (MOUSE)Nat1 and (HUMAN)NAT2 is less clear-cut. Methods To determine whether the (MOUSE)NAT1 and (HUMAN)NAT2 enzymes are functionally equivalent, we expressed and purified (MOUSE)NAT1*1 and analysed its substrate specificity using a panel of arylamines and hydrazines. To understand how specific residues contribute to substrate selectivity, three site-directed mutants of (MOUSE)NAT2*1 were prepared: these were (MOUSE)NAT2_F125S, (MOUSE)NAT2_R127G and (MOUSE)NAT2_R127L. All three exhibited diminished activity towards “(MOUSE)NAT2-specific” arylamines but were more active against hydrazines than (MOUSE)NAT1*1. The inhibitory and colorimetric properties of a selective naphthoquinone inhibitor of (HUMAN)NAT1 and (MOUSE)NAT2 were investigated. Results Comparing (MOUSE)NAT1*1 with other mammalian NAT enzymes demonstrated that the substrate profiles of (MOUSE)NAT1 and (HUMAN)NAT2 are less similar than previously believed. Three key residues (F125, R127 and Y129) in (HUMAN)NAT1*4 and (MOUSE)NAT2*1 were required for enzyme inhibition and the associated colour change on naphthoquinone binding. In silico modelling of selective ligands into the appropriate NAT active sites further implicated these residues in substrate and inhibitor specificity in mouse and human NAT isoenzymes. Conclusions Three non-catalytic residues within (HUMAN)NAT1*4 (F125, R127 and Y129) contribute both to substrate recognition and inhibitor binding by participating in distinctive intermolecular interactions and maintaining the steric conformation of the catalytic pocket. These active site residues contribute to the definition of substrate and inhibitor selectivity, an understanding of which is essential for facilitating the design of second generation (HUMAN)NAT1-selective inhibitors for diagnostic, prognostic and therapeutic purposes. In particular, since the expression of (HUMAN)NAT1 is related to the development and progression of oestrogen-receptor-positive breast cancer, these structure-based tools will facilitate the ongoing design of candidate compounds for use in (HUMAN)NAT1-positive breast tumours. Electronic supplementary material The online version of this article (doi:10.1186/2050-6511-15-68) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | | | | | | | - Edith Sim
- Department of Pharmacology, University of Oxford, Oxford, UK.
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Structure–activity relationships and colorimetric properties of specific probes for the putative cancer biomarker human arylamine N-acetyltransferase 1. Bioorg Med Chem 2014; 22:3030-54. [DOI: 10.1016/j.bmc.2014.03.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 03/03/2014] [Accepted: 03/10/2014] [Indexed: 11/17/2022]
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Laurieri N, Dairou J, Egleton JE, Stanley LA, Russell AJ, Dupret JM, Sim E, Rodrigues-Lima F. From arylamine N-acetyltransferase to folate-dependent acetyl CoA hydrolase: impact of folic acid on the activity of (HUMAN)NAT1 and its homologue (MOUSE)NAT2. PLoS One 2014; 9:e96370. [PMID: 24823794 PMCID: PMC4019507 DOI: 10.1371/journal.pone.0096370] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 04/07/2014] [Indexed: 11/24/2022] Open
Abstract
Acetyl Coenzyme A-dependent N-, O- and N,O-acetylation of aromatic amines and hydrazines by arylamine N-acetyltransferases is well characterised. Here, we describe experiments demonstrating that human arylamine N-acetyltransferase Type 1 and its murine homologue (Type 2) can also catalyse the direct hydrolysis of acetyl Coenzyme A in the presence of folate. This folate-dependent activity is exclusive to these two isoforms; no acetyl Coenzyme A hydrolysis was found when murine arylamine N-acetyltransferase Type 1 or recombinant bacterial arylamine N-acetyltransferases were incubated with folate. Proton nuclear magnetic resonance spectroscopy allowed chemical modifications occurring during the catalytic reaction to be analysed in real time, revealing that the disappearance of acetyl CH3 from acetyl Coenzyme A occurred concomitantly with the appearance of a CH3 peak corresponding to that of free acetate and suggesting that folate is not acetylated during the reaction. We propose that folate is a cofactor for this reaction and suggest it as an endogenous function of this widespread enzyme. Furthermore, in silico docking of folate within the active site of human arylamine N-acetyltransferase Type 1 suggests that folate may bind at the enzyme’s active site, and facilitate acetyl Coenzyme A hydrolysis. The evidence presented in this paper adds to our growing understanding of the endogenous roles of human arylamine N-acetyltransferase Type 1 and its mouse homologue and expands the catalytic repertoire of these enzymes, demonstrating that they are by no means just xenobiotic metabolising enzymes but probably also play an important role in cellular metabolism. These data, together with the characterisation of a naphthoquinone inhibitor of folate-dependent acetyl Coenzyme A hydrolysis by human arylamine N-acetyltransferase Type 1/murine arylamine N-acetyltransferase Type 2, open up a range of future avenues of exploration, both for elucidating the developmental role of these enzymes and for improving chemotherapeutic approaches to pathological conditions including estrogen receptor-positive breast cancer.
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Affiliation(s)
- Nicola Laurieri
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Julien Dairou
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
| | - James E. Egleton
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Lesley A. Stanley
- Consultant in Investigative Toxicology, Linlithgow, West Lothian, United Kingdom
| | - Angela J. Russell
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Jean-Marie Dupret
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
| | - Edith Sim
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Faculty of Science, Engineering and Computing, Kingston University, Kingston on Thames, United Kingdom
- * E-mail: (FR-L); (ES)
| | - Fernando Rodrigues-Lima
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
- * E-mail: (FR-L); (ES)
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