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Zhang L, Cheng Q, Zhang L, Wang Y, Merrill GF, Ilani T, Fass D, Arnér ESJ, Zhang J. Serum thioredoxin reductase is highly increased in mice with hepatocellular carcinoma and its activity is restrained by several mechanisms. Free Radic Biol Med 2016; 99:426-435. [PMID: 27581528 DOI: 10.1016/j.freeradbiomed.2016.08.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/23/2016] [Accepted: 08/26/2016] [Indexed: 02/02/2023]
Abstract
Increased thioredoxin reductase (TrxR) levels in serum were recently identified as possible prognostic markers for human prostate cancer or hepatocellular carcinoma. We had earlier shown that serum levels of TrxR protein are very low in healthy mice, but can in close correlation to alanine aminotransferase (ALT) increase more than 200-fold upon chemically induced liver damage. We also found that enzymatic TrxR activity in serum is counteracted by a yet unidentified oxidase activity in serum. In the present study we found that mice carrying H22 hepatocellular carcinoma tumors present highly increased levels of TrxR in serum, similarly to that reported in human patients. In this case ALT levels did not parallel those of TrxR. We also discovered here that the TrxR-antagonistic oxidase activity in serum is due to the presence of quiescin Q6 sulfhydryl oxidase 1 (QSOX1). We furthermore found that the chemotherapeutic agents cisplatin or auranofin, when given systemically to H22 tumor bearing mice, can further inhibit TrxR activities in serum. The TrxR serum activity was also inhibited by endogenous electrophilic inhibitors, found to increase in tumor-bearing mice and to include protoporphyrin IX (PpIX) and 4-hydroxynonenal (HNE). Thus, hepatocellular carcinoma triggers high levels of serum TrxR that are not paralleled by ALT, and TrxR enzyme activity in serum is counteracted by several different mechanisms. The physiological role of TrxR in serum, if any, as well as its potential value as a prognostic marker for tumor progression, needs to be studied further.
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Affiliation(s)
- Le Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui 230036, PR China
| | - Qing Cheng
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Longjie Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui 230036, PR China
| | - Yijun Wang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui 230036, PR China
| | - Gary F Merrill
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR 97331, USA
| | - Tal Ilani
- Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Deborah Fass
- Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Elias S J Arnér
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Jinsong Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui 230036, PR China.
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Tan Y, Sun L, Xi Z, Yang GF, Jiang DQ, Yan XP, Yang X, Li HY. A capillary electrophoresis assay for recombinant Bacillus subtilis protoporphyrinogen oxidase. Anal Biochem 2008; 383:200-4. [PMID: 18834852 DOI: 10.1016/j.ab.2008.09.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Revised: 09/05/2008] [Accepted: 09/08/2008] [Indexed: 11/30/2022]
Abstract
Protoporphyrinogen oxidase (PPO) is a flavin adenine dinucleotide (FAD)-containing enzyme in the tetrapyrrole biosynthetic pathway that leads to the formation of both heme and chlorophylls, which has been identified as one of the most important action targets of commercial herbicides. The literature reports gave different PPO-catalytic kinetic parameters for the substrate protoporphyrinogen IX (K(m) of 0.1 to 10.4 miocroM) with different sources of PPO using fluorescent or HPLC methods. Herein we assayed the enzymatic activity of recombinant Bacillus subtilis PPO by using capillary electrophoresis (CE), a method with high separation efficiency, easy automation, and low sample consumption. The Michaelis constant and maximum reaction velocity were determined as 7.0+/-0.6 miocroM and 0.38+/-0.02 miocromol min(-1)miocrog(-1), respectively. The interaction between PPO and acifluorfen, a commercial PPO-inhibiting herbicide, was measured as the inhibition constant 186.9+/-9.3 miocroM EM, Cyrillic. The relationship between cofactor FAD and PPO activity can also be quantitatively studied by this CE method. The CE method used here should also be a convenient, reliable method for PPO study.
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Affiliation(s)
- Ying Tan
- State Key Laboratory of Element-Organic Chemistry and Department of Chemical Biology, Nankai University,Tianjin 300071, China
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Wakamatsu JI, Okui J, Hayashi N, Nishimura T, Hattori A. Zn protoporphyrin IX is formed not from heme but from protoporphyrin IX. Meat Sci 2007; 77:580-6. [DOI: 10.1016/j.meatsci.2007.05.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2006] [Revised: 05/08/2007] [Accepted: 05/08/2007] [Indexed: 11/25/2022]
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4
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Franco R, Pereira AS, Tavares P, Mangravita A, Barber MJ, Moura I, Ferreira GC. Substitution of murine ferrochelatase glutamate-287 with glutamine or alanine leads to porphyrin substrate-bound variants. Biochem J 2001; 356:217-22. [PMID: 11336654 PMCID: PMC1221830 DOI: 10.1042/0264-6021:3560217] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Ferrochelatase (EC 4.99.1.1) is the terminal enzyme of the haem biosynthetic pathway and catalyses iron chelation into the protoporphyrin IX ring. Glutamate-287 (E287) of murine mature ferrochelatase is a conserved residue in all known sequences of ferrochelatase, is present at the active site of the enzyme, as inferred from the Bacillus subtilis ferrochelatase three-dimensional structure, and is critical for enzyme activity. Substitution of E287 with either glutamine (Q) or alanine (A) yielded variants with lower enzymic activity than that of the wild-type ferrochelatase and with different absorption spectra from the wild-type enzyme. In contrast to the wild-type enzyme, the absorption spectra of the variants indicate that these enzymes, as purified, contain protoporphyrin IX. Identification and quantification of the porphyrin bound to the E287-directed variants indicate that approx. 80% of the total porphyrin corresponds to protoporphyrin IX. Significantly, rapid stopped-flow experiments of the E287A and E287Q variants demonstrate that reaction with Zn(2+) results in the formation of bound Zn-protoporphyrin IX, indicating that the endogenously bound protoporphyrin IX can be used as a substrate. Taken together, these findings suggest that the structural strain imposed by ferrochelatase on the porphyrin substrate as a critical step in the enzyme catalytic mechanism is also accomplished by the E287A and E287Q variants, but without the release of the product. Thus E287 in murine ferrochelatase appears to be critical for the catalytic process by controlling the release of the product.
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Affiliation(s)
- R Franco
- Department of Biochemistry and Molecular Biology, College of Medicine, University of South Florida, Tampa, FL 33612, USA
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Lermontova I, Grimm B. Overexpression of plastidic protoporphyrinogen IX oxidase leads to resistance to the diphenyl-ether herbicide acifluorfen. PLANT PHYSIOLOGY 2000; 122:75-84. [PMID: 10631251 PMCID: PMC58846 DOI: 10.1104/pp.122.1.75] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/1999] [Accepted: 10/01/1999] [Indexed: 05/18/2023]
Abstract
The use of herbicides to control undesirable vegetation has become a universal practice. For the broad application of herbicides the risk of damage to crop plants has to be limited. We introduced a gene into the genome of tobacco (Nicotiana tabacum) plants encoding the plastid-located protoporphyrinogen oxidase of Arabidopsis, the last enzyme of the common tetrapyrrole biosynthetic pathway, under the control of the cauliflower mosaic virus 35S promoter. The transformants were screened for low protoporphyrin IX accumulation upon treatment with the diphenyl ether-type herbicide acifluorfen. Leaf disc incubation and foliar spraying with acifluorfen indicated the lower susceptibility of the transformants against the herbicide. The resistance to acifluorfen is conferred by overexpression of the plastidic isoform of protoporphyrinogen oxidase. The in vitro activity of this enzyme extracted from plastids of selected transgenic lines was at least five times higher than the control activity. Herbicide treatment that is normally inhibitory to protoporphyrinogen IX oxidase did not significantly impair the catalytic reaction in transgenic plants and, therefore, did not cause photodynamic damage in leaves. Therefore, overproduction of protoporphyrinogen oxidase neutralizes the herbicidal action, prevents the accumulation of the substrate protoporphyrinogen IX, and consequently abolishes the light-dependent phytotoxicity of acifluorfen.
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Affiliation(s)
- I Lermontova
- Institut f]ur Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstrasse 3, 06466 Gatersleben, Germany
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Magness ST, Brenner DA. Targeted disruption of the mouse ferrochelatase gene producing an exon 10 deletion. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1453:161-74. [PMID: 9989256 DOI: 10.1016/s0925-4439(98)00096-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Protoporphyria is a disease characterized by a deficiency in ferrochelatase, the terminal enzyme in the heme biosynthetic pathway, which catalyzes the chelation of iron and protoporphyrin to form heme. Clinical symptoms arise from an accumulation of protoporphyrin behind the partial enzyme block and include photosensitivity and sometimes hepatobiliary disease. Protoporphyria is described as an dominant disease, yet patients exhibit decreased ferrochelatase activities of 15-30% of normal, not 50% as might be expected. Missense, nonsense, and splicing mutations have been identified in ferrochelatase cDNA from protoporphyric patients. In this study we introduce an exon 10 deletion, an analogous mutation to that described in some protoporphyric patients, into the mouse embryonic stem (ES) cell genome via homologous recombination. Targeted ES cells were confirmed by Southern blot analysis. Expression of wild-type and exon 10-deleted mRNA was demonstrated by reverse transcriptase-polymerase chain reaction (RT-PCR) and cDNA sequencing. Ferrochelatase levels were analyzed by immunoblotting. Ferrochelatase activity was measured by the chelation of zinc and mesoporphyrin, and by the decrease in protoporphyrin accumulation after adding delta-aminolevulinic acid. In the exon 10 +/- ES cells there is expression of both wild-type and exon 10-deleted mRNA, a 50% decrease in cross-reactive material with an anti-ferrochelatase antibody, and an approximate 50% decrease in ferrochelatase activity compared to wild-type ES cells. Therefore, an exon 10 deletion alone is insufficient to decrease ferrochelatase activity to the levels in protoporphyric patients. This suggests that requirement of an additional mutation to decrease the expression of the wild-type allele.
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Affiliation(s)
- S T Magness
- University of North Carolina at Chapel Hill 27599-7038, USA
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7
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Protoporphyria Induced by the Orally Active Iron Chelator 1,2-diethyl-3-hydroxypyridin-4-one in C57BL/10ScSn Mice. Blood 1997. [DOI: 10.1182/blood.v89.3.1045] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractAdministration in the drinking water of the orally-active iron chelator 1,2-diethyl-3-hydroxypyridin-4-one (CP94) to C57BL/10ScSn mice caused the development of hepatic protoporphyria. This was detected after 1 week and continued as long as the chelator was given (15 weeks). The more hydrophilic 1,2-dimethyl- and 1-hydroxyethyl,2-ethyl-analogues (CP20 and CP102) were also tested, but they were both inactive in inducing accumulation of protoporphyrin in the liver. Restriction of in vivo iron supply for ferrochelatase seemed a likely mode of action, but an approximately 30% decrease in activity of this enzyme was also observed when measured in vitro. Extracts of livers from mice given CP20, CP94, and CP102 showed no potential to inhibit mouse ferrochelatase, in contrast to the findings with an extract from mice treated with the known porphyrogenic chemical 4-ethyl - 3 , 5 - diethoxycarbonyl - 2 , 6 - dimethyl - 1 , 4 - dihydropyridine, -indicating that ferrochelatase inhibition did not occur by the formation of an N-ethyl-protoporphyrin derived from metabolism by cytochrome P450. CP20, CP94, CP102, and CP117 (the pivoyl ester of CP102) all caused significant depression of the levels of ferritin-iron and total nonheme iron, but only CP94 caused the significant accumulation of protoporphyrin. Protoporphyria did not occur with iron overloaded C57BL/10ScSn mice or in SWR mice that had elevated basal iron status. Although the protoporphyrin had only a small effect on the total levels of the hemoprotein cytochrome P450 in C57BL/10ScSn mice, the activity of the CYP2B isoforms of cytochrome P450 was actually induced in both strains. The results show that CP94 could cause protoporphyria in individuals of low iron status, perhaps through specifically targeting particular iron pools available to ferrochelatase and by concomitantly stimulating heme synthesis.
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Abstract
This review details an approach to the biochemical diagnosis and follow-up of porphyria. We discuss the problems of diagnosis of both symptomatic patients suspected of porphyria and patients being investigated because of a family history of porphyria. High performance liquid chromatography plays a major role in the investigation of these patients. Molecular biology is emerging as a useful tool in further defining this group of diseases.
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Affiliation(s)
- S Ratnaike
- Department of Biochemistry, Royal Melbourne Hospital, Parkville, Victoria
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Lambeth DO, Muhonen WW. High-performance liquid chromatography-based assays of enzyme activities. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1994; 656:143-57. [PMID: 7952025 DOI: 10.1016/0378-4347(94)00072-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Interest in using HPLC to assay enzymatic reactions continues to grow as evidenced by the more than 100 papers published during the early 1990s. HPLC can be used for any enzymatic assay that requires separation of substrates and products before quantifying the extent of the reaction. The popularity of HPLC-based assays is due to several reasons: (1) HPLC offers unsurpassed precision, specificity, sensitivity, and reproducibility. (2) Powerful microcomputers and user-friendly software automate the running of samples and collection and processing of data. (3) Current columns, especially C18 packings, separate a very wide variety of samples, and (4) A variety of on-line detectors provide a means to detect virtually any compound. This review surveys recent papers on the development of HPLC-based assays for enzymes that degrade or otherwise modify macromolecules. Methods for assaying enzymes involved in metabolic pathways are also reviewed. Work by the authors in developing HPLC-based assays for mitochondrial enzymes that use GTP/GDP and other nucleotides that cannot be or are not easily assayed by enzyme-coupled assays is discussed. These enzymes include nucleoside diphosphate kinase, succinate thiokinase, and GTP-AMP phosphotransferase. The assays are suitable for determining the submitochondrial compartmentation of enzyme activities. Finally, current and anticipated trends in HPLC technology, including new column packings and the trend toward smaller columns that give faster separations, are reviewed in relation to enzyme assays.
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Affiliation(s)
- D O Lambeth
- Department of Biochemistry and Molecular Biology, School of Medicine, University of North Dakota, Grand Forks 58202-9001
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Schneider-Yin X, Schäfer BW, Möhr P, Burg G, Minder EI. Molecular defects in erythropoietic protoporphyria with terminal liver failure. Hum Genet 1994; 93:711-3. [PMID: 8005600 DOI: 10.1007/bf00201578] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We identified two additional mutations in the ferrochelatase gene in two Swiss patients with erythropoietic protoporphyria (EPP). Ferrochelatase cDNA from patients was amplified by the polymerase chain reaction (PCR) and subjected to mutation analysis by sequencing PCR products either directly or after subcloning. The first patient, who underwent liver transplantation because of terminal liver failure, was identified as having a single point mutation (C to T) at nucleotide 175 that resulted in a Gln to stop codon conversion in one allele of the gene. In the second case, in which the patient has so far no liver involvement, a two-base deletion (T899G900) was found in one allele. Frameshift as a result of the deletion creates a stop codon. This study presents two new genotypes of EPP, including one with liver failure, a rare and fatal form of EPP.
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Proulx KL, Woodard SI, Dailey HA. In situ conversion of coproporphyrinogen to heme by murine mitochondria: terminal steps of the heme biosynthetic pathway. Protein Sci 1993; 2:1092-8. [PMID: 8358292 PMCID: PMC2142421 DOI: 10.1002/pro.5560020703] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Coproporphyrinogen oxidase (EC 1.3.3.3), protoporphyrinogen oxidase (EC 1.3.3.4), and ferrochelatase (EC 4.99.1.1) catalyze the terminal three steps of the heme biosynthetic pathway. All three are either bound to or associated with the inner mitochondrial membrane in higher eukaryotic cells. A current model proposes that these three enzymes may participate in some form of multienzyme complex with attendant substrate channeling (Grand-champ, B., Phung, N., & Nordmann, Y., 1978, Biochem. J. 176, 97-102; Ferreira, G.C., et al., 1988, J. Biol. Chem. 263, 3835-3839). In the present study we have examined this question in isolated mouse mitochondria using two experimental approaches: one that samples substrate and product levels during a timed incubation, and a second that follows dilution of radiolabeled substrate by pathway intermediates. When isolated mouse mitochondria are incubated with coproporphyrinogen alone there is an accumulation of free protoporphyrin. When Zn is added as a substrate for the terminal enzyme, ferrochelatase, along with coproporphyrinogen, there is formation of Zn protoporphyrin with little accumulation of free protoporphyrin. When EDTA is added to this incubation mixture with Zn, Zn protoporphyrin formation is eliminated and protoporphyrin is formed. We have examined the fate of radiolabeled substrates in vitro to determine if exogenously supplied pathway intermediates can compete with the endogenously produced compounds. The data demonstrate that while coproporphyrinogen is efficiently converted to heme in vitro when the pathway is operating below maximal capacity, exogenous protoporphyrinogen can compete with endogenously formed protoporphyrinogen in heme production.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- K L Proulx
- Department of Microbiology, University of Georgia, Athens 30602-2605
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Wang Q, Ris HB, Altermatt HJ, Reynolds B, Stewart JC, Bonnett R, Lim CK. Determination of 5,10,15,20-tetra-(m-hydroxyphenyl)chlorin in human plasma by high performance liquid chromatography. Biomed Chromatogr 1993; 7:45-7. [PMID: 8431680 DOI: 10.1002/bmc.1130070112] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A high performance liquid chromatographic method for the determination of the photodynamic chemotherapeutic agent 5,10,15,20-tetra(m-hydroxyphenyl)chlorin (m-THPC) in human plasma following intravenous infusion is described. The procedure involves extraction of the drug in plasma with methanol/dimethyl sulphoxide (4:1 v/v) containing 5,10,15,20-tetra(p-hydroxyphenyl)chlorin as the internal standard and separation on a C18 reversed phase column with acetonitrile:0.1% trifluoroacetic acid (77:23 v/v) as the mobile phase. The drug was detected specifically and sensitively at its absorption maximum of 423 nm with a detection limit of 15 ng/mL (signal-to-noise ratio of 5). The intra- and inter-assay coefficients of variation (CV) on analysis of a plasma spiked with m-THPC (1 micrograms/mL) were 2.3 and 3.4% (n = 6), respectively.
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Affiliation(s)
- Q Wang
- MRC Toxicology Unit, Medical Research Council Laboratory, Carshalton, Surrey, UK
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Rossi E, Taketani S, Garcia-Webb P. Lead and the terminal mitochondrial enzymes of haem biosynthesis. Biomed Chromatogr 1993; 7:1-6. [PMID: 8431673 DOI: 10.1002/bmc.1130070102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Lead exposure causes increases in urinary coproporphyrin excretion and the accumulation of zinc protoporphyrin in red cells. In the conventional view of the effect of lead on haem biosynthesis, the accumulation of these metabolites results from lead inhibition of two of the mitochondrial enzymes of haem biosynthesis, coproporphyrinogen oxidase (EC 1.3.3.3) and ferrochelatase (EC 4.99.1.1). This review critically assesses the evidence for the inhibition of these enzymes. We consider this evidence to be inconclusive and alternative explanations for the increased concentrations of coproporphyrin and zinc protoporphyrin are proposed.
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Affiliation(s)
- E Rossi
- Clinical Biochemistry Department, Queen Elizabeth II Medical Centre, Nedlands, W.A., Australia
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Healy PJ, Camilleri L, Poulos V, Hart KG, Kemp BJ, Moore RE, Dooley J, Warner M. Protoporphyria in Limousin cattle. Aust Vet J 1992; 69:144-5. [PMID: 1642600 DOI: 10.1111/j.1751-0813.1992.tb07488.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- P J Healy
- Elizabeth Macarthur Agricultural Institute, Camden, New South Wales
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