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Huang L, Li Y, Pan H, Lu Y, Zhou X, Shi F. Cortex dictamni-induced liver injury in mice: The role of P450-mediated metabolic activation of furanoids. Toxicol Lett 2020; 330:41-52. [PMID: 32437846 DOI: 10.1016/j.toxlet.2020.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 04/11/2020] [Accepted: 05/05/2020] [Indexed: 01/18/2023]
Abstract
Many furan containing compounds have been reported to be toxic resulted from the metabolic activation of the furan ring to reactive metabolite (RM). Cortex Dictamni (CD), a widely used herbal medicine, has been reported to cause severe even fatal hepatotoxicity. The injurious components and mechanism of CD-induced liver injury remain unclear. Our preliminary study showed that dictamnine, one major furanoid in CD, caused mouse liver injury via its reactive epoxide metabolite. Besides dictamnine, the major components of CD are series of bioactivation-alerting furanoids. Thus, we hypothesize that series of furanoids in CD may undergo metabolic activation and play a key role in CD-induced liver injury. Here, a single oral dose of 60 g/kg ethanol extract of CD (ECD) caused severe hepatocellular necrosis in mice at 24 h post-dose. ECD-induced liver injury showed a dose- and time-dependent manner. The hepatotoxic effects could be completely abolished by P450 nonselective inhibitor 1-aminobenzotriazole (ABT) and strongly modulated by other P450 modulators. The furanoids-concentrated fraction of ECD was responsible for the hepatotoxicity. At least ten furanoids with high abundance in ECD, such as obakunone, dictamnine, fraxinellone, limonin, were found to be metabolized to reactive epoxide or cis-enedione. The RM levels were consistent with the liver injury degree. Multiple furanoids, rather than single one, cooperatively contributed to the hepatotoxicity. ECD-induced liver injury could be reproduced by a mixture of pure furanoids. In summary, this study provides toxic component profiles of CD and demonstrates that P450-mediated bioactivation of multiple furanoids is responsible for CD-induced liver injury.
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Affiliation(s)
- Linyan Huang
- Key Laboratory of Basic Pharmacology of Ministry of Education & Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563003, China; Department of Clinical Pharmacy, School of Pharmacy, Zunyi Medical University, Zunyi 563003, China
| | - Yi Li
- Key Laboratory of Basic Pharmacology of Ministry of Education & Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563003, China
| | - Hong Pan
- Department of Clinical Pharmacy, School of Pharmacy, Zunyi Medical University, Zunyi 563003, China
| | - Yuanfu Lu
- Key Laboratory of Basic Pharmacology of Ministry of Education & Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563003, China
| | - Xumei Zhou
- Department of Clinical Pharmacy, School of Pharmacy, Zunyi Medical University, Zunyi 563003, China.
| | - Fuguo Shi
- Key Laboratory of Basic Pharmacology of Ministry of Education & Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563003, China.
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Abstract
Resolution of inflammation has emerged as an active process in immunobiology, with cells of the mononuclear phagocyte system being critical in mediating efferocytosis and wound debridement and bridging the gap between innate and adaptive immunity. Here we investigated the roles of cytochrome P450 (CYP)-derived epoxy-oxylipins in a well-characterized model of sterile resolving peritonitis in the mouse. Epoxy-oxylipins were produced in a biphasic manner during the peaks of acute (4 h) and resolution phases (24-48 h) of the response. The epoxygenase inhibitor SKF525A (epoxI) given at 24 h selectively inhibited arachidonic acid- and linoleic acid-derived CYP450-epoxy-oxlipins and resulted in a dramatic influx in monocytes. The epoxI-recruited monocytes were strongly GR1(+), Ly6c(hi), CCR2(hi), CCL2(hi), and CX3CR1(lo) In addition, expression of F4/80 and the recruitment of T cells, B cells, and dendritic cells were suppressed. sEH (Ephx2)(-/-) mice, which have elevated epoxy-oxylipins, demonstrated opposing effects to epoxI-treated mice: reduced Ly6c(hi) monocytes and elevated F4/80(hi) macrophages and B, T, and dendritic cells. Ly6c(hi) and Ly6c(lo) monocytes, resident macrophages, and recruited dendritic cells all showed a dramatic change in their resolution signature following in vivo epoxI treatment. Markers of macrophage differentiation CD11b, MerTK, and CD103 were reduced, and monocyte-derived macrophages and resident macrophages ex vivo showed greatly impaired phagocytosis of zymosan and efferocytosis of apoptotic thymocytes following epoxI treatment. These findings demonstrate that epoxy-oxylipins have a critical role in monocyte lineage recruitment and activity to promote inflammatory resolution and represent a previously unidentified internal regulatory system governing the establishment of adaptive immunity.
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Triorganotin compounds - ligands for “rexinoid” inducible transcription factors: Biological effects. Toxicol Lett 2015; 234:50-8. [DOI: 10.1016/j.toxlet.2015.02.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 02/10/2015] [Accepted: 02/11/2015] [Indexed: 11/18/2022]
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Chang-Liao WL, Chien CF, Lin LC, Tsai TH. Isolation of gentiopicroside from Gentianae Radix and its pharmacokinetics on liver ischemia/reperfusion rats. JOURNAL OF ETHNOPHARMACOLOGY 2012; 141:668-673. [PMID: 21855624 DOI: 10.1016/j.jep.2011.08.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 08/02/2011] [Accepted: 08/02/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Gentiopicroside (GPS) is a secoiridoid glucoside isolated from the ethanol extract of Gentianae Radix with a content of 13%, which has been used for centuries in Chinese as a digestive aid. AIM OF THE STUDY This study investigates the pharmacokinetics of GPS and its metabolic pathway for the liver ischemia/reperfusion (I/R) in rats. MATERIALS AND METHODS The experimental animals were anesthetized intraperitoneally (i.p.) with a mixture of urethane (1.0 g/kg) and α-chloralose (0.1 g/kg). A midline laparatomy was performed and the liver hilum was gently exposed. All structures in the portal triad (hepatic artery, portal vein, and bile duct) to the left and median liver lobes were occluded with silk thread for 30 min. Ischemia was followed by a sudden reperfusion after removing the occluding threads. After 60 min reperfusion, the rats received a single intravenous 5 mg/kg dose of GPS. RESULTS The area under concentration curve (AUC) was significantly increased; however, the clearance (Cl) was significantly decreased in the liver I/R rats. Furthermore, after pretreated with SKF-525A (50 mg/kg, i.p.), a cytochrome P450 (CYP) inhibitor, AUC, elimination half-life (t(1/2)) and the mean residence time (MRT) of GPS in rat blood were significantly increased, suggesting that CYP was involved in the metabolism of GPS. For the group without liver I/R, GPS was administered at doses of 5 mg/kg and 100 mg/kg intravenously and orally, respectively. The pharmacokinetic results indicated that the AUC was 565±95.1 and 1163±273 min μg/mL and the t(1/2) of GPS was 71±9 and 106±17 min after intravenous and oral administration, respectively. The oral bioavailability of GPS was 10.3±2.4% in the rats. CONCLUSIONS The status of I/R might prolong the disposition of GPS, and the plasma concentration of GPS in the liver I/R injury rats was significantly increased. The increased body exposure of GPS in the treatment of liver I/R may result from the decreased metabolism of GPS mediated by CYP in the liver.
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MESH Headings
- Administration, Oral
- Animals
- Area Under Curve
- Biological Availability
- Biotransformation
- Chromatography, High Pressure Liquid
- Cytochrome P-450 Enzyme Inhibitors
- Cytochrome P-450 Enzyme System/metabolism
- Disease Models, Animal
- Drugs, Chinese Herbal/administration & dosage
- Drugs, Chinese Herbal/isolation & purification
- Drugs, Chinese Herbal/pharmacokinetics
- Enzyme Inhibitors/pharmacology
- Gentiana/chemistry
- Half-Life
- Injections, Intravenous
- Iridoid Glucosides/administration & dosage
- Iridoid Glucosides/blood
- Iridoid Glucosides/isolation & purification
- Iridoid Glucosides/pharmacokinetics
- Liver/blood supply
- Liver/drug effects
- Liver/metabolism
- Male
- Medicine, Chinese Traditional
- Metabolic Clearance Rate
- Plants, Medicinal
- Proadifen/pharmacology
- Rats
- Rats, Sprague-Dawley
- Reperfusion Injury/blood
- Reperfusion Injury/drug therapy
- Reperfusion Injury/metabolism
- Reproducibility of Results
- Spectrophotometry, Ultraviolet
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Affiliation(s)
- Wan-Ling Chang-Liao
- Institute of Traditional Medicine, National Yang-Ming University, Taipei 112, Taiwan
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Jendzelovský R, Mikes J, Koval' J, Soucek K, Procházková J, Kello M, Sacková V, Hofmanová J, Kozubík A, Fedorocko P. Drug efflux transporters, MRP1 and BCRP, affect the outcome of hypericin-mediated photodynamic therapy in HT-29 adenocarcinoma cells. Photochem Photobiol Sci 2009; 8:1716-23. [PMID: 20024169 DOI: 10.1039/b9pp00086k] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Photodynamic therapy (PDT) is a flexible multi-target therapeutic approach. One of the main requirements of successful PDT is sufficient intracellular concentration of an applicable photosensitizer. Mechanisms of anticancer drug elimination by tumour cells are mostly linked to the elevated expression and activity of P-glycoprotein (P-gp), multidrug resistance-associated protein 1 (MRP1), breast cancer resistance protein (BCRP) and P450 monooxygenases. The interaction of hypericin with this cell drug-defence system is still unclear. We report here for the first time increased activity of MRP1 and BCRP in HT-29 colon cancer cells treated with hypericin per se. On the contrary, pre-treatment with proadifen (SKF525A) affected the function of MRP1 and BCRP leading to increased hypericin content, which might indicate a possible link between proadifen and these ABC transporter proteins. Subsequent enhanced intracellular oxidative stress was accompanied by loss of mitochondrial membrane potential, activation of caspase-9 and -3, PARP cleavage and onset of apoptosis. In conclusion, our study suggests that drug efflux transporters MRP1 and BCRP affect the pharmacokinetics of hypericin in HT-29 colon adenocarcinoma cells, and the action of hypericin-mediated PDT (HY-PDT) should be modulated by pre-treatment with their specific inhibitors.
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Affiliation(s)
- Rastislav Jendzelovský
- Institute of Biology and Ecology, Faculty of Science, P.J. Safárik University in Kosice, Moyzesova 11, 040 01, Kosice, Slovakia
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Tang J, Akao T, Nakamura N, Wang ZT, Takagawa K, Sasahara M, Hattori M. In Vitro Metabolism of Isoline, a Pyrrolizidine Alkaloid fromLigularia duciformis, by Rodent Liver Microsomal Esterase and Enhanced Hepatotoxicity by Esterase Inhibitors. Drug Metab Dispos 2007; 35:1832-9. [PMID: 17639025 DOI: 10.1124/dmd.107.016311] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Isoline, a major retronecine-type pyrrolizidine alkaloid (PA) from the Chinese medicinal herb Ligularia duciformis, was suggested to be the most toxic known PA. Its in vitro metabolism was thus examined in rat and mouse liver microsomes, and its toxicity was compared with that of clivorine and monocrotaline after i.p. injection in mice. Isoline was more rapidly metabolized by both microsomes than clivorine and monocrotaline and converted to two polar metabolites M1 and M2, which were spectroscopically determined to be bisline (a deacetylated metabolite of isoline) and bisline lactone, respectively. Both metabolites were formed in the presence or absence of an NADPH-generating system with liver microsomes but not cytosol. Their formation was completely inhibited by the esterase inhibitors, triorthocresyl phosphate (TOCP) and phenylmethylsulfonyl fluoride, but not at all or partially by cytochrome P450 (P450) inhibitors, alpha-naphthoflavone and proadifen (SKF 525A), respectively. These results demonstrated that both metabolites were produced by microsomal esterase(s) but not P450 isozymes. The esterase(s) involved showed not only quite different activities but also responses to different inhibitors in rat and mouse liver microsomes, suggesting that different key isozyme(s) or combinations might be responsible for the deacetylation of isoline. Isoline injected i.p. into mice induced liver-specific toxicity that was much greater than that with either clivorine or monocrotaline, as judged by histopathology as well as serum alanine aminotransferase and aspartate aminotransferase levels. Isoline-induced hepatotoxicity was remarkably enhanced by the esterase inhibitor TOCP but was reduced by the P450 inhibitor SKF 525A, indicating that rodent hepatic esterase(s) played a principal role in the detoxification of isoline via rapid deacetylation in vivo.
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Affiliation(s)
- Jun Tang
- Institute of Natural Medicine, University of Toyama, Toyama 930-0194, Japan
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Ohhira S, Enomoto M, Matsui H. In vitro metabolism of tributyltin and triphenyltin by human cytochrome P-450 isoforms. Toxicology 2006; 228:171-7. [DOI: 10.1016/j.tox.2006.08.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 08/19/2006] [Accepted: 08/21/2006] [Indexed: 10/24/2022]
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Oh SM, Chung KH. Identification of mammalian cell genotoxins in respirable diesel exhaust particles by bioassay-directed chemical analysis. Toxicol Lett 2005; 161:226-35. [PMID: 16242274 DOI: 10.1016/j.toxlet.2005.09.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Revised: 09/09/2005] [Accepted: 09/09/2005] [Indexed: 10/25/2022]
Abstract
A bioassay-directed chemical analysis which consists of mammalian cell bioassays (comet assay, CBMN assay and EROD-microbioassay) in conjunction with analytical measurements was performed to identify the most biologically active compounds of the diesel exhaust particulate matters (DEPs) on mutagenic activity. These bioassay systems were suitable to estimate the mammalian genotoxic potentials of pollutants present in low concentrations in limited environmental samples, as is the case with DEPEs. The results from mutagenic assay showed that the aromatic and slightly polar fraction of DEPs induced chromosomal damage and DNA breakage in a non-cytotoxic dose. It was also revealed that indirect-acting mutagens may mainly contribute to the mutagenic effect of aromatic fraction via the enzyme metabolism system. In the aromatic fraction, several indirect-acting mutagenic PAHs such as dibenzo(a,h)anthracene, chrysene, and 1,2-benzanthracene were detected by GC-MS and the complex mixture effect of this fraction was quantified in terms of its biological-TCDD equivalent concentration (bio-TEQ) which was 32.82 bio-TEQ ng/g-DEPs by EROD-microbioassay. Conclusively, we confirmed that indirect-acting mutagens contained in aromatic fraction may be important causatives of the genotoxicity of extracts of DEPs by integrating the results obtained from a mammalian cell bioassay-directed fractionation.
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Affiliation(s)
- Seung-Min Oh
- College of Pharmacy, Sungkyunkwan University, #300 Cheoncheondong, Jangan-Gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
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Shim WJ, Yim UH, Kim NS, Hong SH, Oh JR, Jeon JK, Okamura H. Accumulation of butyl- and phenyltin compounds in starfish and bivalves from the coastal environment of Korea. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2005; 133:489-499. [PMID: 15519724 DOI: 10.1016/j.envpol.2004.06.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2003] [Accepted: 06/30/2004] [Indexed: 05/24/2023]
Abstract
Triphenyltin (TPT) and tributyltin (TBT) concentrations were determined in two starfish species (Asteria pectinifera and Asterias amurensis), bivalves (Crassostrea gigas or Mytilus edulis), and seawater samples from sites around the coasts of Korea. Both TPT and TBT concentrations in starfish ranged from 8 to 1560 ng/g and from <2 to 797 ng/g as Sn on a dry weight basis, respectively. TPT concentration accounted for 75.4% and 86.4% of total phenyltin concentration in A. pectinifera and A. amurensis, respectively, while monobutyltin, a degradation product of TBT, accounted for 86.3% and 57.2% of total butyltin, respectively. Triphenyltin concentrations in A. pectinifera were significantly correlated to water and bivalve TPT concentrations, which implies that dietary uptake of TPT from contaminated prey as well as direct uptake from surrounding water contribute to TPT body residues in the starfish. Starfish could be target organisms for monitoring TPT compound in the marine environment, due to their high accumulation and low degradation capacity towards TPT.
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Affiliation(s)
- Won Joon Shim
- Southern Coastal Environment Research Division, Korea Ocean Research and Development Institute, Jangmok-myon 391, Geoje 656-830, South Korea.
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10
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Abstract
Organotin compounds have a broad range of applications. While dialkyltin compounds are used primarily as stabilizers for plastics, trisubstituted organotins are mainly used as biocides e.g., as an active ingredient of marine antifouling paints for boats and ships. Since a number of organotin compounds have been demonstrated to be toxic, there is increasing concern that their widespread use may cause adverse effects within environmental and biological systems. Besides carcinogenic and neurotoxic effects, as well as effects on the reproductive system, the most obvious mammalian effects of both various di- and trisubstituted organotins were found on the immune system. Exposure of humans to organotin compounds can take place through consumption of contaminated fish and seafood. In human liver samples, mainly dibutyltin, the metabolite of tributyltin, could be detected indicating that organotin compounds are bioavailable after dietary exposure. The objective of this short review is to present various toxicokinetic aspects of organotin compounds in more detail. While several studies using in vitro systems investigated their metabolism especially by the monooxygenase system, various aspects of absorption, distribution, metabolism, and excretion (ADME) pathways of different organotin compounds were described by data obtained from several studies with laboratory animals. However, most of these studies were not conducted as full ADME studies but dealt only with some of these aspects. Therefore, for definitive conclusions in some cases, additional information is requested. By reviewing and updating the current literature consideration was given preferentially to those organotin compounds which have relevance with respect to human exposure and/or toxicological effects.
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Affiliation(s)
- Klaus E Appel
- Federal Institute for Risk Assessment, Berlin, Germany
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Ohhira S, Watanabe M, Matsui H. Identification of principal cytochrome P-450 in triphenyltin metabolism in rats. Toxicol Lett 2004; 148:141-8. [PMID: 15019098 DOI: 10.1016/j.toxlet.2004.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Revised: 01/06/2004] [Accepted: 01/06/2004] [Indexed: 10/26/2022]
Abstract
The in vivo and in vitro metabolism of triphenyltin using rat hepatic cytochrome P-450 (CYP) systems was investigated to confirm the specific CYP that is closely related to triphenyltin metabolism. No significant sex differences occurred between the in vivo and in vitro metabolic patterns of the chemical, indicating that the principal CYP for triphenyltin metabolism in rats is not a sex-specific form of CYP. In addition, seven types of complementary DNA (cDNA)-expressed rat CYPs, typical phenobarbital (PB)-inducible forms and the CYP2C subfamily were tested to determine the activity of triphenyltin metabolism. Among the CYP isoforms studied, although CYP2B1 had a small metabolic capacity, a marked dearylation of the chemical was induced by CYP2C6. Furthermore, anti-rat CYP2C6 antibodies and cimetidine, a selective CYP2C6 inhibitor, inhibited triphenyltin dearylation activity in the hepatic microsomes of rats. Taken together, these findings suggest that CYP2C6 is the principal CYP for the triphenyltin metabolism in rats.
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Affiliation(s)
- Shuji Ohhira
- Department of Hygiene, Dokkyo University School of Medicine, Mibu-machi, Tochigi 321-0293, Japan.
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Ohhira S, Watanabe M, Matsui H. Metabolism of tributyltin and triphenyltin by rat, hamster and human hepatic microsomes. Arch Toxicol 2003; 77:138-44. [PMID: 12632253 DOI: 10.1007/s00204-002-0428-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2002] [Accepted: 10/30/2002] [Indexed: 11/30/2022]
Abstract
Tributyltin and triphenyltin are metabolized by cytochrome P-450 system enzymes, and their metabolic fate may contribute to the toxicity of the chemicals. In the current study, the in vitro metabolism of tributyltin and triphenyltin by rat, hamster and human hepatic microsomes was investigated to elucidate the metabolic competence for these compounds in humans. The metabolic reaction using microsome-NADPH system that is usually conducted was not applicable to in vitro metabolism of organotins, especially triphenyltin. We therefore examined the effects of dithiothreitol (DTT), one of the antioxidants for sulfhydryl groups, to determine the in vitro metabolism of tributyltin and triphenyltin. As a result, the treatment with 0.1 mM DTT in vitro increased the activity of the microsomal monooxygenase system for metabolism of tributyltin as well as triphenyltin; the total yield of tributyltin and triphenyltin metabolites as tin increased, respectively, by approximately 1.8 and 8.9 times for rat, 2.1 and 1.2 times for hamster, and 1.6 and 1.5 times for human. It is suggested that the organotins directly inactivate cytochrome P-450 because of the interaction with critical sulfhydryl groups of the hemoprotein. We confirmed the utility of this in vitro metabolic system using DTT in the hepatic microsomes of phenobarbital (PB)-pretreated and untreated hamsters. Thus, the in vitro metabolic system described here was applied to a comparative study of the metabolism of organotins in rats, hamsters and humans. Tributyltin was metabolized more readily than triphenyltin in all the species. In humans, the in vitro metabolic pattern resembled that of hamsters, which were susceptible to in vivo triphenyltin toxicity because of incompetent metabolism. It is possible that the hamster is a qualitatively and quantitatively suitable animal model for exploring the influence of tributyltin and triphenyltin in humans.
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Affiliation(s)
- Shuji Ohhira
- Department of Hygiene, Dokkyo University School of Medicine, Mibu-machi, Tochigi, 321-0293, Japan.
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