The Substrate of UDP-Glucuronosyltransferases 2B7, 2B17 and The
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Pharmacological Reports 70 (2018) 972–980 Contents lists available at ScienceDirect Pharmacological Reports ELSEVIER journal homepage: www.elsevier.com/locate/pharep Original article Drug-drug interaction potential of antitumor acridine agent C-1748: Check for updates The substrate of UDP-glucuronosyltransferases 2B7, 2B17 and the inhibitor of 1A9 and 2B7 Anna Mróz, Izabela Ryska, Hanna Sominko, Anna Bejrowska, Zofia Mazerska* Department of Pharmaceutical Technology and Biochemistry, Chemical Faculty, Gdansk University of Technology, Gdansk, Poland A R T I C L E I N F O A B S T R A C T 0 Article history: Background: The compound 9-(2 -hydroxyethylamino)-4-methyl-1-nitroacridine (C-1748), the promis- Received 7 August 2017 ing antitumor agent developed in our laboratory was determined to undergo phase I metabolic pathways. Received in revised form 14 March 2018 The present studies aimed to know its biotransformation with phase II enzymes – UDP- Accepted 21 March 2018 glucuronosyltransferases (UGTs) and its potential to be engaged in drug-drug interactions arising from Available online 22 March 2018 the modulation of UGT activity. Methods: UGT-mediated transformations with rat liver (RLM), human liver (HLM), and human intestine Keywords: (HIM) microsomes and with 10 recombinant human isoenzymes were investigated. Studies on the ability Antitumor agent C-1748 of C-1748 to inhibit UGT were performed with HLM, HT29 colorectal cancer cell homogenate and the Drug-drug interactions selected recombinant UGT isoenzymes. The reactions were monitored using HPLC-UV/Vis method and II phase metabolism Glucuronidation the C-1748 metabolite structure was determined with ESI-TOF-MS/MS analysis. β Enzyme inhibition Results: Pseudo-molecular ion (m/z 474.1554) and the experiment with -glucuronidase indicated that UGT O-glucuronide of C-1748 was formed in the presence of microsomal fractions. This reaction was selectively catalyzed by UGT2B7 and 2B17. High inhibitory effect of C-1748 was shown towards isoenzyme UGT1A9 (IC50 = 39.7 mM) and significant but low inhibitory potential was expressed in HT29 cell homogenate (IC50 = 84.5 mM). The mixed-type inhibition mechanism (Ki = 17.0 mM; Ki’ = 81.0 mM), induced by C-1748 was observed for recombinant UGT1A9 glucuronidation, whereas HT29 cell homogenate resulted in noncompetitive inhibition (Ki = 94.6 mM). Conclusions: The observed UGT-mediated metabolism of C-1748 and its ability to inhibit UGT activity should be considered as the potency for drug resistance and drug-drug interactions in the prospective multidrug therapy. © 2018 The Authors. Published by Elsevier B.V. on behalf of Institute of Pharmacology, Polish Academy of Sciences. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/ 4.0/). Introduction supplements can influence the drug metabolism by the inhibition of enzymes activity. UGT inhibition is regarded as one of the most UDP-glucuronosyltransferases (UGTs) catalyze the glucuroni- important factor for clinical drug-drug and herb-drug interactions dation reaction of many endogenous and exogenous compounds (DDIs, HDI) [4]. Common modulation effect on UGT activity is due leading to the metabolites more polar than aglycones, which can be to the fact that glucuronidation accounts for approximately 35% of readily excreted outside the body [1]. To date, at least 22 human phase II drug metabolism reactions [1]. UGT isoenzymes have been identified, which were classified into It was shown that UGT-based DDIs were engaged in antidia- four gene families, UGT1, UGT2, UGT3 and UGT8 [2]. The individual betic rapaglinide metabolism impairment during hypolipidemic UGT isoenzymes exhibit distinct, but overlapping, patterns of the gemfibrozil coadministration [5]. The nonsteroidal anti-inflam- substrates and inhibitor selectivities [3]. matory drug niflumic acid, being the substrate for UGT1A1 and to For a drug that undergoes UGT-mediated biotransformation, a lesser extent for several other UGTs is capable of inhibiting both simultaneous administration of medications and dietary UGT1A9 and UGT2B7 [6]. Miners et al. demonstrated that niflumic acid inhibited propofol and acetaminophen glucuronidation by HLM and recombinant isoenzymes [7]. Antitumor kinase inhib- itors such as sorafenib, erlotinib and gefitinib were shown to * Corresponding author. fi E-mail address: zofi[email protected] (Z. Mazerska). inhibit UGT1A1 [8]. As a result the signi cant increase in the https://doi.org/10.1016/j.pharep.2018.03.007 1734-1140/© 2018 The Authors. Published by Elsevier B.V. on behalf of Institute of Pharmacology, Polish Academy of Sciences. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). A. Mróz et al. / Pharmacological Reports 70 (2018) 972–980 973 exposure to irinotecan and its active metabolite SN-38 was Cell culture and homogenate preparation observed [9]. Sorafenib exhibited also strong inhibition towards microsomal UGT1A9 [10]. Human colorectal adenocarcinoma cell line HT29 was obtained Recently, many reports related to UGT-based HDIs have been from D. Banerjee from Department of Medicine and Pharmacology, published. For example licorice flavonoid licochalcone A exhibited Cancer Institute of New Jersey, USA. The cells were maintained as a broad spectrum of inhibition against most of the human UGTs described previously [14]. Confluent cells were trypsinized with [11 ], whereas lactone compounds from Andrographis paniculata Trypsin-EDTA solution (Sigma-Aldrich, St. Louis, MO, USA) and specifically inhibited UGT2B7 isoenzyme [12]. Specific stereo- centrifuged (1000 rpm, 5 min, 4 C). The pellet was washed two selective inhibitory effect on most UGT isoenzymes was demon- times with phosphate-buffered saline (pH 7.4). The cell suspension strated for triterpenoid saponins found in ginseng [13]. was subjected to homogenization for 5 min in glass tissue grinder. 0 The studied here compound 9-(2 -hydroxyethylamino)-4- Total cell homogenate protein concentration (28 mg/ml) was methyl-1-nitroacridine, C-1748 is one of the most promising determined using the Bradford assay (Bio-Rad, USA). antitumor agents developed in our laboratory. It exhibited strong cytotoxic activity towards colon cancer cell lines [14] as well as Reactions with microsomal and recombinant UGTs high antitumor activity against prostate carcinoma xenografts in nude mice [15]. Animal toxicity studies revealed C-1748 to have Screening for glucuronidation activity towards C-1748 was very low systemic toxicity, which allowed its selection for conducted with RLM, HLM, HIM and 10 recombinant human UGT preclinical studies [16,17]. We showed earlier that C-1748 isoenzymes. The proteins at a final concentration of 1 mg/ml were underwent phase I metabolism with human liver microsomes, incubated with 0.1 mM C-1748 (20 mM stock solution in DMSO human recombinant cytochrome P450 reductase (CPR) and in diluted with water) in a buffer containing 50 mM Tris-HCl (pH 7.5), HepG2 cell line with the crucial role of hypoxic conditions. 8 mM MgCl2 and 25 mg/ml alamethicin. After preincubation for Metabolites identified as 1-aminoacridine derivatives and this one 5 min at 37 C, UDPGA in water (final concentration of 5 mM) was with an additional 6-membered ring were found. The key role of added to initiate the reaction. The metabolism process was CPR, not cytochrome P450 3A4, in the activation mechanism of maintained at 37 C for incubation times: 0/10/30/60/90/120/180/ C-1748, was demonstrated recently. However, the overexpression 240 min and 0/30/60/120/240 min in the case of microsomal of both CPR and P450 3A4 changed the proapoptotic activity and fractions and recombinant UGT isoenzymes, respectively. For sensitized pancreatic cancer cells AsPC-1 to this drug [18,19]. kinetic analyses of C-1748 glucuronidation in HLM and HIM the Our current research is focused on phase II metabolism of substrate concentrations were: 0.01/0.025/0.05/0.1/0.25 mM. C-1748 UGT, as well as to investigate the effect of this compound on Other reaction mixture components concentrations and reaction UGT activity. Metabolism of C-1748 catalyzed by UGT in conditions were as described above with the incubation time set at microsomal fractions and with human recombinant UGT iso- 60 min. The reactions were stopped by adding an equal volume enzymes was investigated and the structure of C-1748 glucuronide (50 ml) of ice-cold methanol, which contained 0.025 mM C-857 as metabolite was identified. The effect of the drug on UGT activity an internal standard in the case of microsomal fractions. In order to was studied with three enzymatic systems: microsomal fraction, remove the proteins, the samples were centrifuged (13,400 rpm, HT29 cell homogenate, and the selected human recombinant UGT 10 min). The supernatant fractions were used for HPLC analysis. isoenzymes. β-glucuronidase assay Materials and methods Hydrolysis with β-glucuronidase (GUS) was used to identify Chemicals and reagents the glucuronide peak. After incubation of 0.1 mM C-1748 with 0.5 mg/ml RLM and 5 mM UDPGA for 30 min, 1000 U of GUS was 0 C-1748 9-(2 -hydroxyethylamino)-4-methyl-1-nitroacridine added, and the sample was incubated for the following 90 min. The 0 and C-857 9-(2 -hydroxyethylamino)-1-nitroacridine were syn- reaction was performed and prepared for HPLC analysis as thesised according to the method described in Ref [20] 7-ethyl-10- described above for microsomal and recombinant UGTs. hydroxycamptothecin (SN-38), 7-hydroxy-4-trifluoromethylcou- marin (HFC), 7-hydroxycoumarin, alamethicin 5 mg/ml in DMSO Investigation of UGT inhibition by C-1748 from Trichoderma viride, ammonium formate, dimethyl sulfoxide (DMSO), epirubicin hydrochloride, formic acid, magnesium HFC, a nonselective substrate for UGT, was used as a probe chloride, trifluoperazine dihydrochloride (TFP), Tris hydrochloride, substrate for HLM, UGT1A9, UGT1A10 and HT29 cells homogenate. 0 uridine 5 -diphosphoglucuronic acid trisodium salt (UDPGA) were For UGT1A1, UGT1A4 and UGT2B7 selective substrates: SN-38, TFP purchased from Sigma-Aldrich (St.