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Beijer K, Nowak C, Sundström J, Ärnlöv J, Fall T, Lind L. In search of causal pathways in diabetes: a study using proteomics and genotyping data from a cross-sectional study. Diabetologia 2019; 62:1998-2006. [PMID: 31446444 PMCID: PMC6805963 DOI: 10.1007/s00125-019-4960-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 06/06/2019] [Indexed: 12/12/2022]
Abstract
AIMS/HYPOTHESIS The pathogenesis of type 2 diabetes is not fully understood. We investigated whether circulating levels of preselected proteins were associated with the outcome 'diabetes' and whether these associations were causal. METHODS In 2467 individuals of the population-based, cross-sectional EpiHealth study (45-75 years, 50% women), 249 plasma proteins were analysed by the proximity extension assay technique. DNA was genotyped using the Illumina HumanCoreExome-12 v1.0 BeadChip. Diabetes was defined as taking glucose-lowering treatment or having a fasting plasma glucose of ≥7.0 mmol/l. The associations between proteins and diabetes were assessed using logistic regression. To investigate causal relationships between proteins and diabetes, a bidirectional two-sample Mendelian randomisation was performed based on large, genome-wide association studies belonging to the DIAGRAM and MAGIC consortia, and a genome-wide association study in the EpiHealth study. RESULTS Twenty-six proteins were positively associated with diabetes, including cathepsin D, retinal dehydrogenase 1, α-L-iduronidase, hydroxyacid oxidase 1 and galectin-4 (top five findings). Three proteins, lipoprotein lipase, IGF-binding protein 2 and paraoxonase 3 (PON-3), were inversely associated with diabetes. Fourteen of the proteins are novel discoveries. The Mendelian randomisation study did not disclose any significant causal effects between the proteins and diabetes in either direction that were consistent with the relationships found between the protein levels and diabetes. CONCLUSIONS/INTERPRETATION The 29 proteins associated with diabetes are involved in several physiological pathways, but given the power of the study no causal link was identified for those proteins tested in Mendelian randomisation. Therefore, the identified proteins are likely to be biomarkers for type 2 diabetes, rather than representing causal pathways.
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Affiliation(s)
- Kristina Beijer
- Department of Medical Sciences, Uppsala University, UCR, Dag Hammarskjölds väg 38, SE-751 83, Uppsala, Sweden.
| | - Christoph Nowak
- Department of Neurobiology, Care Sciences and Society, Division of Family Medicine and Primary Care, Karolinska Institute, Stockholm, Sweden
| | - Johan Sundström
- Department of Medical Sciences, Uppsala University, UCR, Dag Hammarskjölds väg 38, SE-751 83, Uppsala, Sweden
| | - Johan Ärnlöv
- Department of Neurobiology, Care Sciences and Society, Division of Family Medicine and Primary Care, Karolinska Institute, Stockholm, Sweden
- School of Health and Social Sciences, Dalarna University, Falun, Sweden
| | - Tove Fall
- Department of Medical Sciences, Uppsala University, UCR, Dag Hammarskjölds väg 38, SE-751 83, Uppsala, Sweden
| | - Lars Lind
- Department of Medical Sciences, Uppsala University, UCR, Dag Hammarskjölds väg 38, SE-751 83, Uppsala, Sweden
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Gutiérrez-Salinas J, García-Ortiz L, Mondragón-Terán P, Hernández-Rodríguez S, Ramírez-García S, Núñez-Ramos NR. [Assessment of the concentrations of carbonylated proteins and carbonyl reductase enzyme in mexican women with breast cancer: A pilot study]. GAC MED MEX 2016; 152:13-18. [PMID: 26927639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
Oxidative stress could promote the development of cancer and implicate carbonylated proteins in the carcinogenic process. The goal of this study was to assess the concentrations of carbonylated proteins and carbonyl reductase enzyme in women with breast cancer and determine whether these markers were possible indicators of tissue damage caused by the disease. A total of 120 healthy women and 123 women with a diagnosis of breast cancer were included. The concentration of carbonylated proteins in plasma and the concentration of carbonyl reductase enzyme in leukocytes were determined using the ELISA assay. There was a 3.76-fold increase in the amount of carbonylated proteins in the plasma from the patient group compared with healthy control group (5±3.27 vs. 1.33±2.31 nmol carbonyls/mg protein; p<0.05). Additionally, a 60% increase in the carbonyl reductase enzyme was observed in the patient group compared with the healthy control group (3.27±0.124 vs. 2.04±0.11 ng/mg protein; p<0.05). A positive correlation (r=0.95; p<0.001) was found between both measurements. These results suggest the presence of tissue damage produced by cancer; therefore, these parameters could be used to indicate tissue damage in cancer patients.
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Affiliation(s)
- José Gutiérrez-Salinas
- Laboratorio de Bioquímica y Medicina Experimental, División de Investigación Biomédica, Centro Médico Nacional 20 de Noviembre, ISSSTE, México, D.F., México
| | - Liliana García-Ortiz
- División de Medicina Genómica, Centro Médico Nacional 20 de Noviembre, ISSSTE, México, D.F., México
| | - Paul Mondragón-Terán
- Laboratorio de Medicina Regenerativa e Ingeniería de Tejidos, División de Investigación Biomédica, Centro Médico Nacional 20 de Noviembre, ISSSTE, México, D.F., México
| | - Sergio Hernández-Rodríguez
- Laboratorio de Bioquímica y Medicina Experimental, División de Investigación Biomédica, Centro Médico Nacional 20 de Noviembre, ISSSTE, México, D.F., México
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3
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Kuleshova DK, Davydov VV, Shvets VN. [Aldehyde reductase activity and blood aldo-keto reductase spectrum in adolescents with neuroendocrine obesity]. Ukr Biokhim Zh (1999) 2012; 84:96-100. [PMID: 23387273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Investigation of aldehyde-reductase activity and blood aldo-keto reductase spectrum has been performed in 13-15 and 16-18-years old adolescents with obesity to clear up the mechanisms of neuroendocrine obesity at the age of puberty. It has been established that basal aldehyde reductase activity and blood aldo-keto reductase spectrum of healthy adolescents in early puberty do not differ from those of healthy adolescents in late puberty. A decreased aldehyde reductase activity and some alterations in blood aldo-keto reductase spectrum have been observed in late puberty in adolescents with neuroendocrine obesity. In adolescents with obesity there have been registered some changes in blood aldo-keto reductase spectrum which are not accompanied by any alterations in its aldehyde reductase activity. The results obtained suggest that certain prerequisites are formed in late puberty to complicate the course of neuroendocrine obesity.
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Shimokhina NI, Petrova MM, Savchenko AA, Smertina EG. [The state of hemostatic system and platelet metabolism in patients with complicated hypertensive disease]. Klin Med (Mosk) 2010; 88:31-35. [PMID: 20608061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The study designed to estimate the state of the homeostatic system, levels of NAD and NAD-dependent dehydrogenases included 90 patients with complicated hypertensive disease and coronary heart disease following ischemic stroke. Hypercoagulation and enhanced platelet aggregation occurred throughout the entire follow-up period. Acute stage of ischemic stroke was associated with marked changes in bioenergetic and plastic processes.
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Mimić-Oka J, Savić-Radojević A, Pljesa-Ercegovac M, Opacić M, Simić T, Dimković N, Simić DV. Evaluation of Oxidative Stress after Repeated Intravenous Iron Supplementation. Ren Fail 2009; 27:345-51. [PMID: 15957553 DOI: 10.1081/jdi-56599] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Parenteral iron has been recommended for the treatment of iron deficiency in the majority of maintenance hemodialyzed (HD) patients. However, iron supplementation and consequent over saturation of transferrin and high iron levels, may aggravate oxidative stress already present in these patients. This study aimed to further clarify the role of repeated intravenous iron therapy as a supplementary cause of oxidative stress in HD patients. Markers of free radical activities (carbonyl reactive derivatives, CRD, thiol groups, SH, malondialdehyde, MDA) and antioxidant enzyme activities (superoxide dismutase, SOD and glutathione peroxidase, GPX) were determined in plasma and red blood cells (RBC) of 19 hemodialysis patients given a total iron dose of 625 mg (ferrogluconat, Ferrlecit, 62.5 mg). Blood samples were taken before the first and after the last dose of iron. Twenty apparently normal subjects served as healthy controls. Before iron treatment, HD patients exhibited increased concentrations of MDA and CRD in plasma and red blood cells, accompanied with impaired antioxidant capacity. All patients responded to iron therapy with a significant increase in their serum ferritin, serum iron, hemoglobin, and red blood cells levels. However, iron treatment resulted in enhanced oxidative stress in plasma of HD patients, since significant increase in plasma MDA and CRD concentrations, together with a decrease in nonprotein SH groups levels were detected. Supplementation with iron did not significantly influence plasma SOD and GPX activities, nor did any of the red blood cell parameters tested. Our data show that, despite improvement in hematological parameters, an increase in iron stores due to supplementation could also contribute to increased free radical production in HD patients.
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Affiliation(s)
- Jasmina Mimić-Oka
- Institute of Biochemistry, Faculty of Medicine, University of Belgrade, Belgrade, Serbia and Montenegro.
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Knight J, Holmes RP, Milliner DS, Monico CG, Cramer SD. Glyoxylate reductase activity in blood mononuclear cells and the diagnosis of primary hyperoxaluria type 2. Nephrol Dial Transplant 2006; 21:2292-5. [PMID: 16597637 PMCID: PMC1579247 DOI: 10.1093/ndt/gfl142] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Primary hyperoxaluria type 2 (PH2) is a rare monogenic disorder characterized by an elevated urinary excretion of oxalate. Increased oxalate excretion in PH2 patients can cause nephrolithiasis and nephrocalcinosis, and can, in some cases, result in renal failure and systemic oxalate deposition. The disease is due to a deficiency of glyoxylate reductase/hydroxypyruvate reductase (GRHPR) activity. A definitive diagnosis of PH2 is currently made by the analysis of GR activity in a liver biopsy. GRHPR is expressed in virtually every tissue in the body, suggesting that utilization of more readily available cells could be used to determine GRHPR deficiency. In this study, we have evaluated the potential of determining GR and d-glycerate dehydrogenase (DGDH) activity in blood mononuclear cells (BMC) as a diagnostic indicator of PH2. METHODS Blood samples were obtained from 10 male and 10 female normal subjects, median age 31, range 21-63, at the Wake Forest University Medical Center and from primary hyperoxaluria patients at the Mayo Clinic. The BMC were isolated and GR and DGDH activities measured in cell lysates. RESULTS An assay of 20 normal individuals indicated that BMC contained a DGDH and GR activity of 0.97+/-0.20 (range 0.62-1.45), and 10.6+/-3.3 (range 8.3-16.6) nmol/min/mg protein, respectively. The intra-assay coefficient of variation for DGDH and GR activity was 8.2 and 11.5%, respectively. The BMC lysates from normal adult subjects and patients with PH1 showed similar GR and DGDH activities. This was confirmed by the presence of immunoreactive GRHPR protein by western blot analysis. In contrast, PH2 BMC lysates did not exhibit DGDH or GR activity, and showed no immunoreactive GRHPR by western blot analysis. CONCLUSION These results suggest that the assay of DGDH or GR activity in BMC could be used as a minimally invasive diagnostic test for PH2.
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Affiliation(s)
- John Knight
- Department of Urology, Wake Forest University School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, USA.
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Abstract
For many years it has been apparent from estimates of the anion gap and the strong ion gap that anions of unknown identity can be generated in sepsis and shock states. Evidence is emerging that at least some of these are intermediates of the citric acid cycle. The exact source of this disturbance remains unclear, because a great many metabolic blocks and bottlenecks can disturb the anaplerotic and cataplerotic pathways that enter and leave the cycle. These mechanisms require clarification with the use of tools such as gas chromatography–mass spectrometry.
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Affiliation(s)
- Francis G Bowling
- Director of Biochemical Diseases, Mater Children's Hospital and Professor of Medical Biochemistry, School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Australia
| | - Thomas J Morgan
- Senior Specialist, Adult Intensive Care Units, Mater Health Services, Brisbane, Australia
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Abstract
BACKGROUND Previous studies have provided evidence for the importance of platelet-derived nitric oxide (NO) for the regulation of hemostasis. Tetrahydrobiopterin (BH4) is an essential cofactor and regulator of NO synthase activity in the vasculature; however, it is as yet unknown whether platelets dispose over a functional BH4 synthesis. METHODS AND RESULTS We quantified mRNA expression of genes involved in BH4 synthesis, measured enzymatic activities, and determined intraplatelet levels of pteridines in platelets from healthy volunteers and from patients treated for prolonged periods of time with glucocorticoids. Freshly isolated platelets from healthy volunteers show functional BH4 synthesis, as evidenced by the presence of mRNA species and enzymatic activity of GTP cyclohydrolase I (GTPCH), 6-pyruvoyl tetrahydropterin synthase, and sepiapterin reductase. Biopterin was the major intraplatelet pteridine, whereas no neopterin was found. mRNA expression and enzymatic activity of GTPCH were undetectably low in platelets that had been stored for 5 days, and no pteridines were found in these platelets. Freshly isolated platelets from patients treated with glucocorticoids had decreased mRNA expression and activity of GTPCH compared with platelets from healthy volunteers. CONCLUSIONS Human platelets dispose over a functional de novo BH4 synthesis. Furthermore, our results indicate the potential of external factors, eg, prolonged storage or glucocorticoid therapy, to significantly affect BH4 synthesis within platelets. Together, these findings offer new insights into the biology and pathobiology of platelet function in humans.
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Affiliation(s)
- Nicola Franscini
- Medical Clinic B Research Unit, Department of Medicine, University Hospital, Zürich, Switzerland
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Olpin SE, Pollitt RJ, McMenamin J, Manning NJ, Besley G, Ruiter JPN, Wanders RJA. 2-methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency in a 23-year-old man. J Inherit Metab Dis 2002; 25:477-82. [PMID: 12555940 DOI: 10.1023/a:1021251202287] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
2-Methyl-3-hydroxybutyryl-CoA dehydrogenase (EC 1.1.1.178) deficiency is a recently described defect of isoleucine catabolism. The disorder is characterized by normal early development followed by a progressive loss of mental and motor skills. Deterioration may be rapid or may follow a slower decline with a possible stabilization of the disorder on a low-protein diet and appropriate medication. We report a 23-year-old man with 2-methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency with a very mild clinical course. He had apparently normal early development and remained relatively well until the age of 6 years, when he contracted measles. Following this illness, his motor skills and school progress deteriorated. At 15 years he had significant dysarthria, and generalized rigidity with some dystonic and unusual posturing. He was then treated with a low-protein high-carbohydrate diet with a good response in terms of balance and gait. At 18 years he was given benzhexol (Artane), increased slowly from 2 mg to 6 mg daily, resulting in improvement in tremor and dystonia. At 23 years he can dress himself and works in sheltered employment but remains severely dysarthric.
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Affiliation(s)
- S E Olpin
- Department of Neonatal Screening and Chemical Pathology Sheffield Children's Hospital, Sheffield, UK
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11
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Bonafé L, Thöny B, Penzien JM, Czarnecki B, Blau N. Mutations in the sepiapterin reductase gene cause a novel tetrahydrobiopterin-dependent monoamine-neurotransmitter deficiency without hyperphenylalaninemia. Am J Hum Genet 2001; 69:269-77. [PMID: 11443547 PMCID: PMC1235302 DOI: 10.1086/321970] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2001] [Accepted: 05/31/2001] [Indexed: 11/03/2022] Open
Abstract
Classic tetrahydrobiopterin (BH(4)) deficiencies are characterized by hyperphenylalaninemia and deficiency of monoamine neurotransmitters. In this article, we report two patients with progressive psychomotor retardation, dystonia, severe dopamine and serotonin deficiencies (low levels of 5-hydroxyindoleacetic and homovanillic acids), and abnormal pterin pattern (high levels of biopterin and dihydrobiopterin) in cerebrospinal fluid. Furthermore, they presented with normal urinary pterins and without hyperphenylalaninemia. Investigation of skin fibroblasts revealed inactive sepiapterin reductase (SR), the enzyme catalyzing the final two-step reaction in the biosynthesis of BH(4). Mutations in the SPR gene were detected in both patients and their family members. One patient was homozygous for a TC-->CT dinucleotide exchange, predicting a truncated SR (Q119X). The other patient was a compound heterozygote for a genomic 5-bp deletion (1397-1401delAGAAC) resulting in abolished SPR-gene expression and an A-->G transition leading to an R150G amino acid substitution and to inactive SR as confirmed by recombinant expression. The absence of hyperphenylalaninemia and the presence of normal urinary pterin metabolites and of normal SR-like activity in red blood cells may be explained by alternative pathways for the final two-step reaction of BH(4) biosynthesis in peripheral and neuronal tissues. We propose that, for the biosynthesis of BH(4) in peripheral tissues, SR activity may be substituted by aldose reductase (AR), carbonyl reductase (CR), and dihydrofolate reductase, whereas, in the brain, only AR and CR are fully present. Thus, autosomal recessive SR deficiency leads to BH(4) and to neurotransmitter deficiencies without hyperphenylalaninemia and may not be detected by neonatal screening for phenylketonuria.
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Affiliation(s)
- Luisa Bonafé
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zurich; Children’s Hospital, Augsburg; and Children’s Hospital Königsborn, Unna, Germany
| | - Beat Thöny
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zurich; Children’s Hospital, Augsburg; and Children’s Hospital Königsborn, Unna, Germany
| | - Johann M. Penzien
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zurich; Children’s Hospital, Augsburg; and Children’s Hospital Königsborn, Unna, Germany
| | - Barbara Czarnecki
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zurich; Children’s Hospital, Augsburg; and Children’s Hospital Königsborn, Unna, Germany
| | - Nenad Blau
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zurich; Children’s Hospital, Augsburg; and Children’s Hospital Königsborn, Unna, Germany
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Oppliger T, Thöny B, Kluge C, Matasovic A, Heizmann CW, Ponzone A, Spada M, Blau N. Identification of mutations causing 6-pyruvoyl-tetrahydropterin synthase deficiency in four Italian families. Hum Mutat 2000; 10:25-35. [PMID: 9222757 DOI: 10.1002/(sici)1098-1004(1997)10:1<25::aid-humu4>3.0.co;2-l] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
6-Pyruvoyl-tetrahydrobiopterin synthase (PTPS) is involved in tetrahydrobiopterin (BH4) biosynthesis, the cofactor for various enzymes including the hepatic phenylalanine hydroxylase. Inherited PTPS deficiency leads to BH4 depletion, causes hyperphenylalaninemia, and requires cofactor replacement therapy for treatment. We previously isolated the human PTPS cDNA and recently characterized its corresponding gene, PTS. Here we developed PCR-based mutation analysis with newly designed primers to detect genomic alterations and describe five mutations, four of which are novel, in the PTS gene of four Italian families with affected individuals. The mutant alleles found included three missense mutations (T67M, K129E, D136V), a previously described triplet deletion (delta V57), and a single c-3-->g transversion in the 3'-acceptor splice site of intron 1, leading to cryptic splice site usage that resulted in a 12 bp deletion (mutant allele delta (K29-S32)). Except for K129E, all mutant alleles were inactive and/or unstable proteins, as shown by recombinant expression and Western blot analysis of patients' fibroblasts. The PTPS-deficient patient with the homozygous K129E allele had transient hyperphenylalaninemia, did not depend on BH4 replacement therapy, and showed normal PTPS immunoreactivity, but no enzyme activity in primary fibroblasts and red blood cells. In contrast to its inactivity in these cells, the K129E mutant was 2-3 fold more active than wild-type PTPS when transfected into COS-1 or the human hepatoma cell line Hep G2. K129E appears thus as a mutant PTPS whose activity depends on the cell type.
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Affiliation(s)
- T Oppliger
- Department of Pediatrics, University of Zürich, Switzerland
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Komarenko DI, Soboleva LP, Ovsiannikova LM, Kadiuk EN, Shvaĭko EA, Nosach EV. [Changes in the L-serine and L-threonine dehydrogenase activities in the blood serum of those who worked in the cleanup of the aftermath of the accident at the Chernobyl Atomic Electric Power Station who became ill with chronic acalculous cholecystitis]. Lik Sprava 1999:8-10. [PMID: 10476630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Activity was studied of blood serum plasmic enzymes L-serine and L-threonine dehydrogenazes (SDG and ThDG) in 92 liquidators of aftermath of the Chernobyl atomic power plant breakdown, presenting with chronic non-calculous cholecystitis during the stage of moderately severe exacerbation with no clinical and laboratory and sonographic signs of affection of the liver. A quarter of the examinees demonstrated an increased activity of the enzymes under study, which fact is regarded by the authors as a preclinical sign of reactive hepatitis. Recommendations are given as to the outpatient registration and prophylactic management and therapy of those persons having taken part in the elimination of the effects of the Chernobyl accident, presenting with biliary pathologies.
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Powell WS, Gravel S, Khanapure SP, Rokach J. Biological inactivation of 5-oxo-6,8,11,14-eicosatetraenoic acid by human platelets. Blood 1999; 93:1086-96. [PMID: 9920859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
Neutrophil-derived 5-oxo-6,8,11,14-eicosatetraenoic acid (5-oxo-ETE) is a potent activator of neutrophils and eosinophils. In the present study we examined the biosynthesis and metabolism of this substance by platelets. Although platelets contain an abundant amount of 5-hydroxyeicosanoid dehydrogenase, the enzyme responsible for the formation of 5-oxo-ETE, they synthesize only very small amounts of this substance from exogenous 5-hydroxyeicosatetraenoic acid (5-HETE) unless endogenous NADPH is converted to NADP+ by addition of phenazine methosulfate. Similarly, relatively small amounts of 5-oxo-ETE were formed by A23187-stimulated mixtures of platelets and neutrophils, which instead formed substantial amounts of two 12-hydroxy metabolites of this substance, 5-oxo-12-HETE and 8-trans-5-oxo-12-HETE, which were identified by comparison with authentic chemically synthesized compounds. These metabolites were also formed from 5-oxo-ETE by platelets stimulated with thrombin or A23187. In contrast, unstimulated platelets converted 5-oxo-ETE principally to 5-HETE. Neither 5-oxo-12-HETE nor 8-trans-5-oxo-12-HETE had appreciable effects on neutrophil calcium levels or platelet aggregation at concentrations as high as 10 micromol/L, but both blocked 5-oxo-ETE-induced calcium mobilization in neutrophils with IC50 values of 0.5 and 2.5 micromol/L, respectively. We conclude that platelets can biologically inactivate 5-oxo-ETE. Unstimulated platelets convert 5-oxo-ETE to 5-HETE, with a 99% loss of biological potency, whereas stimulated platelets convert this substance to 12-hydroxy metabolites, which possess antagonist properties.
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Affiliation(s)
- W S Powell
- Meakins-Christie Laboratories, Department of Medicine, McGill University, Montreal, Quebec, Canada.
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Dockham PA, Sreerama L, Sladek NE. Relative contribution of human erythrocyte aldehyde dehydrogenase to the systemic detoxification of the oxazaphosphorines. Drug Metab Dispos 1997; 25:1436-41. [PMID: 9394035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Detoxification of cyclophosphamide is effected, in part, by hepatic class 1 aldehyde dehydrogenase (ALDH-1)-catalyzed oxidation of aldophosphamide, a pivotal aldehyde intermediate, to the nontoxic metabolite, carboxyphosphamide. This enzyme is found in erythrocytes as well. Detoxification of aldophosphamide may also be effected by enzymes, viz. certain aldo-keto reductases, that catalyze the reduction of aldophosphamide to alcophosphamide. Such enzymes are also found in erythrocytes. Not known at the onset of this investigation was whether the contribution of erythrocyte ALDH-1 and/or aldo-keto reductases to the overall systemic detoxification of circulating aldophosphamide is significant. Thus, NAD-linked oxidation and NADPH-linked reduction of aldophosphamide catalyzed by relevant erythrocyte enzymes were quantified. ALDH-1-catalyzed oxidation of aldophosphamide (160 microM) to carboxyphosphamide occurred at a mean (+/- SD) rate of 5.0 +/- 1.4 atmol/min/rbc (red blood cell). Aldo-keto reductase-catalyzed reduction of aldophosphamide (160 microM) to alcophosphamide occurred at a much slower rate, viz. 0.3 +/- 0.2 atmol/min/rbc. Thus, at a pharmacologically relevant concentration of aldophosphamide, viz. 1 microM, estimated aggregate erythrocyte ALDH-1-catalyzed aldophosphamide oxidation, viz. 2.0 micromol/min, was only about 3% of estimated aggregate hepatic enzyme-catalyzed aldophosphamide oxidation, viz. 72 micromol/min; however, this rate is greater than the estimated flow-limited rate of aldophosphamide delivery to the liver by the blood, viz. 1.5 micromol/min. These observations/considerations suggest an important in vivo role for erythrocyte ALDH-1 in systemic aldophosphamide detoxification. Erythrocyte ALDH-1-effected oxidation of other aldehydes to their corresponding acids, e.g. retinaldehyde to retinoic acid, may also be of pharmacological and/or physiological significance since a wide variety of aldehydes are known to be substrates for ALDH-1.
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Affiliation(s)
- P A Dockham
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis 55455, USA
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Rady-Pentek P, Mueller R, Tang BK, Kalow W. Interindividual variation in the enzymatic 15-keto-reduction of 13,14-dihydro-15-keto-prostaglandin E1 in human liver and in human erythrocytes. Eur J Clin Pharmacol 1997; 52:147-53. [PMID: 9174685 DOI: 10.1007/s002280050264] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE The therapeutic response to PGE1 is highly variable, and a contribution by variable formation of its active tertiary metabolite PGE0 is in question. Hence, the objective of this study was to assess the person-to-person variation of the reduction of the inactive intermediate metabolite 15-KD PGE1 by human liver and human erythrocytes in forming the active metabolite PGE0. METHODS Source of enzyme was lysed erythrocytes from 29 donors, and a bank of 37 donor livers including specimens from 15 children. Tritium-labelled 13,14-dihydro-15-keto-prostaglandin E1 (15-KD PGE1) was used at low nanomolar concentrations and found to be converted almost exclusively to the more polar compound 13,14-dihydro-prostaglandin E1 (PGE0) by an NADPH-dependent carbonyl reductase. The identity of the product PGE0 was established by comparison of its chromatographic and mass spectral characteristics with authentic PGE0. RESULTS Lysed erythrocytes had readily measurable enzymatic activity; differences between the preparations from 29 subjects were very small with only a twofold range of variation. In contrast to lysed erythrocytes, intact erythrocytes did not catalyse the reaction so that the erythrocyte activity should be medically immaterial. 15-KD PGE1 15-ketoreductase activity of liver cytosol averaged 61.1 fmol.min-1.mg-1 protein in preparations from 37 human livers. Individual activities varied over an almost tenfold range, with indications of a non-normal distribution. Kinetic studies of selected specimens showed substantially different Vmax values but indistinguishable kM values, suggesting that the individual variation in 15-KD PGE1 15-ketoreduction is the result of differences in enzyme concentration rather than of structural enzyme variations. The activity in 15 livers from children was significantly lower than in those from adults. Inhibition data suggest that both the liver and the erythrocyte enzymes belong to the class of carbonyl reductases. CONCLUSIONS The variations in hepatic enzyme activity may be expected to affect the transformation of 15-KD PGE1 to the active metabolite PGE0 in vivo. The clinical significance remains to be explored.
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Affiliation(s)
- P Rady-Pentek
- Department of Pharmacology, University of Toronto, Ontario, Canada
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17
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Amitai Y, Bhooma T, Frischer H. Glucose-6-phosphate dehydrogenase deficiency severely restricts the biotransformation of daunorubicin in human erythrocytes. J Lab Clin Med 1996; 127:588-98. [PMID: 8648264 DOI: 10.1016/s0022-2143(96)90150-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Recognition and analysis of distinct mechanisms by which primaquine and other hemolytic drugs activate the hexose monophosphate shunt (HMS) have suggested a hitherto unsuspected pharmacogenetic interaction between daunorubicin metabolism and glucose-6-phosphate dehydrogenase (G6PD) deficiency. Because this deficiency is very common, and because anthracyclines are indispensable antitumor antibiotics that are biotransformed mainly by carbonyl reductase, we have compared the reductase-mediated conversion of daunorubicin to daunorubicinol and the conversion of doxorubicin to doxorubicinol in G6PD-deficient and nondeficient erythrocytes. We found that even without G6PD deficiency, the HMS dehydrogenases selectively limited daunorubicin metabolism, as contrasted with that of doxorubicin. The milder GdA- variety of G6PD deficiency restricted the biotransformation of daunorubicin at therapeutic levels, in hemolysates and intact erythrocytes, within 15 minutes, for at least 24 hours. The bioconversion defect was even more severe in Gd Mediterranean G6PD deficiency. Primaquine aldehyde competed with daunorubicin as a substrate for carbonyl reductase. These studies show that HMS dehydrogenase activity controls carbonyl reductase-dependent biotransformation. New issues arise concerning possible effects of G6PD deficiency on the oncolytic and toxic properties of anthracyclines that are effective substrates for carbonyl reductase and also on non-xenobiotic reactions catalyzed by this enzyme.
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Affiliation(s)
- Y Amitai
- Department of Pharmacology, Rush-Presbyterian-St. Luke's Medical Center, Rush University, Chicago, IL 60612, USA
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18
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Fujii E, Iwase H, Ishii-Karakasa I, Yajima Y, Hotta K. The presence of 2-keto-3-deoxygluconic acid and oxoaldehyde dehydrogenase activity in human erythrocytes. Biochem Biophys Res Commun 1995; 210:852-7. [PMID: 7763257 DOI: 10.1006/bbrc.1995.1736] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
2-Keto-3-deoxygluconic acid (3-DGA) is produced from 3-deoxyglucosone (3-DG:a highly reactive glycation intermediate) through oxidation by the enzyme oxoaldehyde dehydrogenase (OAD) in animals. We developed a specific assay method for 3-DGA using high-performance liquid chromatography [Fujii, E. et al. (1994) J. Chromatogr. B 660, 265-270] and measured it in the hemolysate and plasma of diabetic patients and healthy subjects. Both human erythrocytes and plasma contained considerable amounts of 3-DGA. However, human erythrocyte contained about 30-50 times higher 3-DGA than human plasma did and also had the same ability to convert 3-DG to 3-DGA as OAD had. Erythrocyte 3-DGA levels of diabetic patients were 990 +/- 370 nmol/gHb (n = 57, Mean +/- SD) and were significantly higher compared with healthy subjects (527 +/- 194 nmol/gHb, n = 7, p < 0.01). In all diabetic patients and healthy subjects (n = 64), there was only one patient who had a very low level of erythrocyte 3-DGA and lacked the ability to convert 3-DG to 3-DGA. When erythrocytes were incubated at 37 degrees C for 8 hours in phosphate buffer containing 0.35 mM 3-DG, 3-DG was easily taken into the erythrocytes and was converted to 3-DGA. Our results suggest the contribution of OAD not only to the prevention of glycation of hemoglobin but also to that of blood vessels by scavenging plasma 3-DG into erythrocytes.
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Affiliation(s)
- E Fujii
- Department of Internal Medicine, School of Medicine, Kitasato University, Kanagawa, Japan
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19
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Abstract
Three microsomal enzyme inducers, ethanol, phenobarbital (PB), and beta-naphthoflavone (beta NF), were compared for their effects on butanol oxidase activity in rat hepatic and pulmonary microsomes. Four concentrations of 2-butanol (1.0, 5.0, 10, and 33 mM) were used to determine if the effects of induction on 2-butanol metabolism were substrate concentration dependent. Ethanol induced at all substrate concentrations in the liver while PB induced at only the high substrate concentrations (5.0, 10, and 33 mM). beta NF did not induce at any substrate concentration. 2-Butanol oxidation in the lung was not induced by any of the treatments. Thus, both ethanol and phenobarbital induce hepatic enzymes capable of 2-butanol oxidation, and the isozyme(s) induced by the latter has a somewhat lesser affinity for this alcohol.
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Affiliation(s)
- M G Gadberry
- Department of Pharmacology and Toxicology, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, IN 47907-1334
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20
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Raba J, Mottola HA. Continuous-flow/stopped-flow system incorporating two rotating bioreactors in tandem: application to the determination of alkaline phosphatase activity in serum. Anal Chem 1994; 66:1485-9. [PMID: 8017634 DOI: 10.1021/ac00081a020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Two rotating bioreactors in tandem have been incorporated into a continuous-flow/stopped-flow sample/reagent processing setup for the determination of alkaline phosphatase (EC3.1.3.1) activity in serum samples. The strategy circumvents incompatibility of buffer systems as well as that of the immobilized enzymes utilized in the bioreactors (alkaline phosphatase and alcohol oxidase, EC 1.1.3.13). The determination is indirect in nature although recorded responses are directly related to the enzyme activity in the sample. It couples the following enzyme-catalyzed reactions: (1) hydrolysis of p-nitrophenyl dihydrogen phosphate catalyzed by alkaline phosphatase, (2) enzymatic reaction between unreacted p-nitrophenyl dihydrogen phosphate with methanol, and (3) conversion of the residual methanol to the corresponding aldehyde and H2O2, catalyzed by alcohol oxidase. The H2O2 is amperometrically determined at a stationary Pt-ring electrode (applied potential + 0.600 V vs a Ag/AgCl, 3.0 M NaCl reference).
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Affiliation(s)
- J Raba
- Department of Chemistry, Oklahoma State University, Stillwater 74078-0447
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21
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Kishimoto M, Kawamori R, Kamada T, Inaba T. Carbonyl reductase activity for acetohexamide in human erythrocytes. Drug Metab Dispos 1994; 22:367-70. [PMID: 8070312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Acetohexamide is an oral antidiabetic agent and is metabolized by the reductive conversion of the acetoxy group to a secondary alcohol metabolite. In vivo, many drugs are metabolized by reductase enzymes; however, the characteristics of the enzymes that reduce carbonyl compounds need to be clarified. We tested whether reductase activity for acetohexamide can be found in human erythrocytes. Enzyme activity was monitored by formation of hydroxyhexamide using HPLC methods. In human erythrocytes, reductase activity (6.10 +/- 1.20 nmol/min/g hemoglobin) (mean +/- SD) was indeed observed, when 0.5 mM acetohexamide was used as a substrate. KM values and Vmax at the physiologically important pH 7.4 were 0.70 +/- 0.13 mM and 9.19 +/- 0.88 nmol/min/g hemoglobin, respectively. Separation of protein by gel filtration gave one major peak fraction with reductase activity whose molecular weight was estimated to be 31,000. Known substrates of carbonyl reductase such as menadione, daunorubicin, and ethacrynic acid inhibited the acetohexamide reduction. The acetohexamide reductase in erythrocyte showed characteristics of carbonyl reductase. Furthermore, acetohexamide reductase activity in erythrocyte was approximately 30% activity of that of human liver (0.17 +/- 0.05 nmol/min/mg cytosolic protein). The pattern of inhibitors in human liver was essentially the same as that in erythrocytes. It is plausible that the activity in erythrocytes may predict the activity in the liver. It was concluded that carbonyl reductase in human erythrocyte plays an important role in acetohexamide metabolism.
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Affiliation(s)
- M Kishimoto
- First Department of Internal Medicine, University of Osaka
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22
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Dutoit D, Leroux JM, Vaiva G, Mohamed Y, Thomas P, Pommery J, Taret I, Bianchi-Decaix I, Erb F, Goudemand M. [Value of the determination of erythrocyte haloperidol ketone reductase activity in the evaluation of haloperidol therapy]. Therapie 1994; 49:71-4. [PMID: 8091373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Serum levels of haloperidol and reduced haloperidol as well as the reduced haloperidol/haloperidol ratios were determined in nine acute schizophrenics on oral haloperidol medication and correlated over 21 days with psycho pathology and extra-pyramidal symptom scores. We have investigated red blood cells haloperidol reductase activity in the group of patients. Significant correlations were found between haloperidol plasma levels and positive sub scale for each patient (r = 0.86 and p < 0.01; r = 0.70 and p < 0.05). We found a correlation between red blood cells reductase activity and the improvement of the psychotic anxiety scale (r = 0.64/and p < 0.05; r = 0.67 and p < 0.05), but not with reduced haloperidol/haloperidol ratios in plasma. The knowledge of reductase activity could predict the treatment response in acute schizophrenic patients. We suggest that the reported inter individual and inter ethnic differences in haloperidol and reduced haloperidol and in clinical response and adverse effects may be a reflection of genetic control of the two oxidative pathways mediated by cytochrome P450 isozyme and/or the reductase pathway mediated by haloperidol reductase in individual subject.
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Affiliation(s)
- D Dutoit
- Service de Psychiatrie Générale, C.H.R.U, Unité de Soins Normalisés B, Lille
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23
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Baumgarten R. [Can toxic alcohol liver parenchyma damage be diagnosed using pathobiochemical parameters?]. Z Arztl Fortbild (Jena) 1993; 87:365-7. [PMID: 8100661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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24
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Shibasaki M, Someya T, Takahashi S. Relation of plasma and red blood cells reduced haloperidol concentrations to haloperidol reductase activity assayed in red blood cells in psychiatric population. Prog Neuropsychopharmacol Biol Psychiatry 1993; 17:257-67. [PMID: 8430218 DOI: 10.1016/0278-5846(93)90046-u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
1. Haloperidol (HAL) reductase activity in red blood cells (RBC) was determined by a newly developed assay method in 120 blood samples from 75 Japanese psychiatric patients receiving HAL. 2. Plasma concentrations of HAL and reduced haloperidol (RHAL), a reductive metabolite of haloperidol, were also measured in these samples. 3. RBC concentrations of HAL and RHAL were measured in 62 of these samples. 4. No significant correlations were found between HAL reductase activity in RBC vs plasma or RBC RHAL/HAL ratios, which may represent activity of the enzyme metabolizing HAL into RHAL. 5. RHAL concentrations were three times higher in RBC than in plasma, though HAL concentrations were at the same level in both tissues. This may reflect accumulation of RHAL in RBC.
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Affiliation(s)
- M Shibasaki
- Department of Psychiatry, Shiga University of Medical Science, Otsu, Japan
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25
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Abstract
In the current study, we have examined the catalytic activity and stereospecificity of haloperidol (HP) reductase activity in the cytosolic fractions of human brain and liver and in whole blood. The reductase activity was NADPH-dependent and inhibited by menadione, features typical of the ketone reductases (EC 1.2.1). The Vmax in the brain was about 4-fold higher than in the liver. Moreover, the reaction was stereospecific in that only the S(-) enantiomer was detected in brain and blood and 99.2 +/- 0.1% of the reduced HP (RHP) produced in the liver was S(-). The potential clinical implications of our results are unknown because until now all binding and pharmacodynamic studies with RHP have been performed with the racemate.
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Affiliation(s)
- D W Eyles
- Clinical Studies Unit, Wolston Park Hospital, Brisbane, Australia
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26
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Guzman J, Schoedon G, Blau N. Production of monoclonal antibodies against human 6-pyruvoyl tetrahydropterin synthase and immunocytochemical localization of the enzyme. Biochem Biophys Res Commun 1992; 182:810-6. [PMID: 1734883 DOI: 10.1016/0006-291x(92)91804-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Monoclonal antibodies were produced against human pituitary gland 6-pyruvoyl tetrahydropterin synthase, one of the key enzymes in the biosynthesis of tetrahydrobiopterin, by in vitro immunization with the antigen directly blotted from SDS-PAGE to polyvinylidene difluoride membranes. The antibodies produced show crossreactivity in the enzyme linked immunosorbent assay, not only with the human 6-pyruvoyl tetrahydropterin synthase but some also with the same enzyme isolated from salmon liver. 6-Pyruvoyl tetrahydropterin synthase was localized immuno-enzymatically in peripheral blood smears and in skin fibroblasts by the use of these monoclonal antibodies and the alkaline phosphatase monoclonal anti-alkaline phosphatase labeling technique.
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Affiliation(s)
- J Guzman
- Department of Pediatrics, University of Zürich, Switzerland
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27
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Morozov VG, Bel'gesov NV, Dmitriev VI, Kuz'min AN, Mitin IA, Pastushenkov VL, Sheĭbak VV. [Immuno-metabolic criteria of differential diagnosis in false seropositive and HIV-infected patients]. Gematol Transfuziol 1991; 36:19-21. [PMID: 1834515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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28
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Popova IA, Vetrova EG, Rustam'ian LA, Nosova EA. [Carbohydrate and lipid metabolites and blood serum enzymes in humans during graded exercise test in long-term anti-orthostatic hypokinesia]. Kosm Biol Aviakosm Med 1991; 25:50-4. [PMID: 1870318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Exercise tests were carried out before as well as on days 128 and 248 of a 370-day head-down tilt study. The test subjects, who took part in the study, were divided into two groups that used different regimens of countermeasures (drugs and exercise). During exercise tests the following serum parameters were measured: lactate, pyruvate, glucose, triglycerides, nonesterified fatty acids, lactate dehydrogenase, alpha-hydroxybutyrate dehydrogenase, malate dehydrogenase, creatine phosphokinase. Decrease or delayed increase in the concentration of energy substrates (nonesterified fatty acids and triglycerides) after a standard exercise test is a metabolic manifestation of deconditioning changes induced by head-down tilting. Insufficient supply of a working human body with readily utilizable lipid substrates causes inadequate activation of energy forming enzymes and excessive buildup of metabolites, i. e. lactate and pyruvate. The efficacy of corrective and prophylactic measures was verified by biochemical data.
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29
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Someya T, Shibasaki M, Kato T, Noguchi T, Ishida N, Takahashi S. Haloperidol reductase activity in red blood cells from oriental patients on haloperidol. Prog Neuropsychopharmacol Biol Psychiatry 1991; 15:275-8. [PMID: 1871328 DOI: 10.1016/0278-5846(91)90092-f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
1. We measured haloperidol reductase activity in red blood cells in 87 samples collected from 50 Japanese psychiatric patients on HAL. HAL reductase activities in the patients were in a range of 7.9-26.1 pmol/hr/10(6) RBC (mean = 13.4, S.D. = 3.4). Interindividual variability was as large as 25.4% (CVs), while intraindividual CVs were small (8.9%). 2. Distribution of HAL reductase activities was normal but their values were slightly lower in the patients than those in the normal controls, though the difference between these two groups was not significant. 3. No significant correlations were found between HAL reductase activity in RBC vs dose of HAL per body weight, or plasma and RBC RHAL/HAL ratio.
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Affiliation(s)
- T Someya
- Department of Psychiatry, Shiga University of Medical Science, Japan
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30
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Kerler F, Hültner L, Ziegler I, Katzenmaier G, Bacher A. Analysis of the tetrahydrobiopterin synthesizing system during maturation of murine reticulocytes. J Cell Physiol 1990; 142:268-71. [PMID: 2406277 DOI: 10.1002/jcp.1041420208] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The enzymes of tetrahydrobiopterin synthesis have been studied in murine bone marrow, in spleen, in erythrocytes, and in reticulocytes. Mice with chemically induced and with genetically conditioned reticulocytosis as found in the lactate dehydrogenase deficient strain (Ldh-1c/Ldh-1c) were used for analysis of reticulocytic enzyme activities. The activity of the biopterin synthesizing system is highest in bone marrow even though it amounts to only about 10% as compared with liver. The first enzyme of the biosynthetic pathway, GTP-cyclohydrolase, virtually disappears during the final maturation step of reticulocytes. In contrast, the activities of 6-pyruvoyltetrahydropterin synthase and of sepiapterin reductase of erythrocytes are only reduced to about one half of the reticulocyte level. The absence of biopterin in erythrocytes is therefore caused by the loss of the enzyme that initiates the pterin biosynthetic pathway.
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Affiliation(s)
- F Kerler
- GSF-Institut für Experimentelle Hämatologie, München, Federal Republic of Germany
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31
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Sueoka T, Hikita H, Katoh S. Best-fit analysis of kinetic scheme for the stepwise reduction of the "diketo" group of 6-pyruvoyl tetrahydropterin by sepiapterin reductase. Adv Exp Med Biol 1990; 284:229-39. [PMID: 2053478 DOI: 10.1007/978-1-4684-5901-2_25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- T Sueoka
- Department of Biochemistry, Meikai University School of Dentistry, Saitama, Japan
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32
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Shibasaki M, Someya T, Kato T, Noguchi T, Ishida N, Takahashi S. Measurement of haloperidol reductase activity in red blood cells and reduced haloperidol/haloperidol ratios in plasma in oriental psychiatric patients. Prog Neuropsychopharmacol Biol Psychiatry 1990; 14:941-7. [PMID: 2277853 DOI: 10.1016/0278-5846(90)90079-v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
1. The authors established a method for measuring haloperidol (HAL) reductase activity in human red blood cells. 2. Characteristics of the HAL reductase in red blood cells were examined. This enzyme reaction was NADPH dependent, and the optimum pH was at 8.2-8.9. Vmax and Km were calculated as 25-150 pmol/hr/10(6) RBC and 160-2600 microM respectively. 3. HAL reductase activities in red blood cells from 14 patients treated with HAL were in a range of 9.7-20.8 pmol/hr/10(6) RBC. So far we did not find any significant correlation between HAL reductase activities and reduced HAL/HAL ratios in plasma.
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Affiliation(s)
- M Shibasaki
- Department of Psychiatry, Shiga University of Medical Science, Otsu, Japan
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33
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Abstract
One metabolite of haloperidol present in plasma is "reduced haloperidol." This study demonstrates that human red blood cells are capable of converting haloperidol to reduced haloperidol in vitro. The reductase involved requires NADPH, as does haloperidol (ketone) reductase in human liver cytosol.
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Affiliation(s)
- T Inaba
- Department of Pharmacology, Faculty of Medicine, University of Toronto, Ont., Canada
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34
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Abstract
Leukotriene B4 (LTB4) is converted to 20-hydroxy-LTB4 (20-OH-LTB4) which is subsequently oxidized to 20-carboxy-LTB4 (20-COOH-LTB4). The oxidation of the hydroxy LTB4 to the carboxy LTB4 by human neutrophils was associated with the reduction of NAD+ and required both cytosolic and microsomal fractions. We isolated a cytosolic protein which oxidized the hydroxy LTB4 in the presence of NAD+ and the microsomal fraction. It was homogeneous on SDS/PAGE, with a subunit molecular mass of 37 kDa, and may be a dimeric protein with two identical or similar subunits because its molecular mass, estimated by Sephadex G-100 column chromatography, was about 80 kDa. The protein was an alcohol dehydrogenase with high affinity for omega-hydroxy fatty acids, such as 12-hydroxylaurate and 16-hydroxypalmitate. We conclude that the cytosolic protein oxidizes 20-OH-LTB4 to 20-oxo-LTB4 and the microsomal fraction oxidizes the oxo-LTB4 to the carboxy-LTB4, based on the finding that the activity which oxidizes omega-hydroxy fatty acids is present only in the cytosol fraction, while that which oxidizes hydrophobic aldehydes is found only in the microsomal fraction and that the stoichiometry of the formation of 20-COOH-LTB4 to the reduction of NAD+ was 1:2. The affinity of the dehydrogenase for 20-OH-LTB4 may be higher than that for 12-hydroxylaurate (Km = 70 microM), because the latter inhibited the oxidation of the former by only 40%, at a concentration of 12-hydroxylaurate 10 times higher than that of 20-OH-LTB4. The enzyme activity was not affected by pyrazole and 4-methylpyrazole at millimolar concentrations. These characteristics indicate that the dehydrogenase is a unique type of alcohol dehydrogenase.
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Affiliation(s)
- Y Gotoh
- Department of Biochemistry, Kyushu University School of Medicine, Fukuoka, Japan
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35
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Katoh S, Sueoka T. Properties of carbonyl reductase activity of sepiapterin reductase, an enzyme involved in the biosynthesis of tetrahydrobiopterin. Prog Clin Biol Res 1989; 290:381-95. [PMID: 2657760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- S Katoh
- Department of Biochemistry, School of Dentistry, Meikai University, Saitama, Japan
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36
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Abstract
Sepiapterin reductase activity has been measured in amniotic fibroblasts by two procedures: one photometric and the other HPLC-fluorimetric. Both can be used for quantitative measurements, but the latter has considerable advantages including smaller standard deviation, much lower detection limit, and less volume of sample required. Sepiapterin reductase activity was also assayed in skin fibroblasts, chorionic villi and various blood fractions including stimulated mononuclear blood cells. Red blood cells have a low specific activity compared to unstimulated mononuclear blood cells, although the latter have a mean value with a high standard deviation. When the mononuclear blood cells were cultured for 5 days, the mean specific activity increased and the range became tighter. Enzyme stability and N-acetylserotonin inhibition were also studied.
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Affiliation(s)
- J Ferre
- Department of Genetics, Faculty of Biological Sciences, University of Valencia, Spain
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37
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Seitz HK, Simanowski UA. [Metabolism of alcohol. Significance and metabolic effects]. Internist (Berl) 1988; 29:317-22. [PMID: 3042672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- H K Seitz
- Medizinische Universitätsklinik Heidelberg
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38
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Shintaku H, Niederwieser A, Leimbacher W, Curtius HC. Tetrahydrobiopterin deficiency: assay for 6-pyruvoyl-tetrahydropterin synthase activity in erythrocytes, and detection of patients and heterozygous carriers. Eur J Pediatr 1988; 147:15-9. [PMID: 3276524 DOI: 10.1007/bf00442604] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
6-Pyruvoyl-tetrahydropterin synthase (PTS), a key enzyme in the synthesis of tetrahydrobiopterin in man, is defective in the most frequent variant of tetrahydrobiopterin-deficient hyperphenylalaninaemia (atypical phenylketonuria). An assay for PTS activity in erythrocytes was developed. It is based on the PTS-catalysed formation of tetrahydrobiopterin from dihydroneopterin triphosphate in the presence of magnesium, sepiapterin reductase, NADPH, dihydropteridine reductase, and NADH, and fluorimetric measurement of the product as biopterin by high performance liquid chromatography (HPLC) after oxidation with iodine. The PTS activity was higher in younger erythrocytes, including reticulocytes, than in older ones. Fetal erythrocytes showed approx. four times higher activities than those of adults. Using a more purified human liver sepiapterin reductase fraction which gave a lower yield than a crude preparation, adult controls (n = 8) showed a mean erythrocyte PTS activity of 17.6 (range 11.0-29.5) microU/g Hb. Nine of 11 patients with typical PTS deficiency showed activities between 0% and 8% of the mean of controls, and two of 11 showed 14% and 20%, respectively. The obligate heterozygotes (n = 16) had activities of 19% (range 8%-31%) of the mean of controls, i.e., significantly less than the expected 50%. Four patients with the "peripheral" type of the disease showed 7%-10% of the mean of controls. Thus, the assay did not distinguish between patients and heterozygotes in every family. The assay is well suited to the identification of heterozygotes of PTS deficiency in family studies.
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Affiliation(s)
- H Shintaku
- Universitäts-Kinderklinik, Medizinisch-Chemische Abteilung, Zurich, Switzerland
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Friedrich CA, Ferrell RE, Siciliano MJ, Kitto GB. Biochemical and genetic identity of alpha-keto acid reductase and cytoplasmic malate dehydrogenase from human erythrocytes. Ann Hum Genet 1988; 52:25-37. [PMID: 3052244 DOI: 10.1111/j.1469-1809.1988.tb01075.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We have recently shown that cytoplasmic malate dehydrogenase (MDH-s) from several non-human species catalyses the reduction of aromatic alpha-keto acids in the presence of NADH (Friedrich et al. 1987), an activity previously attributed to the enzyme aromatic alpha-keto acid reductase (KAR E.C.1.1.1.96). Here we present evidence that this also occurs in humans, and that the previously characterized human KAR is not the product of a genetically distinct locus. Human MDH-s and KAR activities co-migrate after starch gel electrophoresis, and electrophoretic variants of human MDH-s exhibited identical variation for KAR. Both enzymes show almost no electrophoretic variation among human populations of diverse origin. The reduction of aromatic alpha-keto acids is substantially inhibited by malate, the end-product of the MDH reaction. Antibodies raised against purified chicken MDH-s equally inhibited both MDH-s and KAR in chickens and humans. The bulk of the KAR activity in human blood appears to be due to MDH-s, with a minor fraction catalysed by LDH, as is the case in most other species studied. The previous assignment of a gene for KAR to human chromosome 12 in human/Chinese hamster somatic cell hybrids is questioned because interspecific hybrid bands of both MDH-s and LDH appear with slightly different mobility approximately midway between the human and hamster controls in somatic cell hybrid studies, and the meaning of this artifact is discussed. The discovery that MDH reacts with intermediate metabolites of phenylalanine and tyrosine has implications in relation to the mechanism by which mental retardation may be produced in phenylketonuria (PKU), and the effect of MDH inhibition on oxidative phosphorylation in the various tyrosinaemias is discussed.
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Affiliation(s)
- C A Friedrich
- Graduate School of Biomedical Sciences, University of Texas Health Science Center, Houston 77225
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Scriver CR, Clow CL, Kaplan P, Niederwieser A. Hyperphenylalaninemia due to deficiency of 6-pyruvoyl tetrahydropterin synthase. Unusual gene dosage effect in heterozygotes. Hum Genet 1987; 77:168-71. [PMID: 3308682 DOI: 10.1007/bf00272386] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We have identified deficient biopterin synthesis in four probands and one sib with persistent postnatal hyperphenylalaninemia. The metabolic findings were associated with a benign clinical presentation and normal biopterin level in cerebrospinal fluid in the newborn period, indicating the peripheral (hepatic) form of this autosomal recessive phenotype. Impaired development was apparent at 3 months in one proband not treated early. Treatment with oral tetrahydropterin restored adequate phenylalanine hydroxylase activity; it also maintained or improved CNS function. The deficient enzyme in these subjects is 6-pyruvoyl tetrahydropterin synthase (PTS). Erythrocyte activity of PTS in homozygotes (or compound heterozygotes) is less than 10% of normal. Heterozygotes have 20%-50% of normal PTS activity (enzyme phenotype), a finding compatible with a range of gene dosage effects, some abnormal. The metabolic phenotype in heterozygotes (urine biopterin excretion) did not correlate with erythrocyte PTS activity. The complex relationship between erythrocyte PTS activity, and biopterin synthesis in these families indicates genetic heterogeneity at the PTS locus.
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Affiliation(s)
- C R Scriver
- McGill University, Children's Hospital Research Institute, Montreal, Quebec, Canada
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Niederwieser A, Shintaku H, Hasler T, Curtius HC, Lehmann H, Guardamagna O, Schmidt H. Prenatal diagnosis of "dihydrobiopterin synthetase" deficiency, a variant form of phenylketonuria. Eur J Pediatr 1986; 145:176-8. [PMID: 3533549 DOI: 10.1007/bf00446058] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Amniocentesis was performed at 19 weeks gestation in a mother who had previously delivered a boy with "dihydrobiopterin synthetase" (DHBS) deficiency. The amniotic fluid contained neopterin in high (136 nmol/l) and biopterin in very low concentrations (1.8 nmol/l). The activity of the phosphate-eliminating enzyme (PEE, also called 6-pyruvoyl tetrahydropterin synthase, substrate: 7,8-dihydroneopterin triphosphate) which is present in liver and erythrocytes and defective in DHBS deficiency, was measured in the erythrocytes of the family members. The fetal sample showed only 2% of the activity of healthy adult controls and was comparable with that of the affected sibling. Obligate heterozygotes had activities around 20% of the controls. Two fetal control samples showed even higher activities than adult erythrocytes, Sepiapterin reductase activities wer normal in all cases. At autopsy, PEE deficiency was confirmed in the liver of the fetus. We concluded that DHBS deficiency (and most probably also GTP cyclohydrolase I deficiency) can be diagnosed by metabolite measurements in amniotic fluid. PEE activity is measurable in erythrocytes, although the assay needs to be improved. Since maternal tetrahydrobiopterin does not cross the placenta, treatment of a tetrahydrobiopterin-deficient fetus with tetrahydrobiopterin in utero is not possible.
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42
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Babenko GA, Skal'nyĭ AV. [Effect of chronic alcoholic intoxication on zinc metabolism in the mother and her progeny]. Akush Ginekol (Mosk) 1986:50-2. [PMID: 2940898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
A homogeneous preparation of sepiapterin reductase, an enzyme involved in the biosynthesis of tetrahydrobiopterin, from rat erythrocytes was found to be responsible for the reduction with NADPH of various carbonyl compounds of non-pteridine derivatives including some vicinal dicarbonyl compounds which were reported in the previous paper (Katoh, S. and Sueoka, T. (1984) Biochem, Biophys. Res. Commun. 118, 859-866) in addition to the general substrate, sepiapterin (2-amino-4-hydroxy-6-lactoyl-7,8-dihydropteridine). The compounds sensitive as substrates of the enzyme were quinones, e.g., p-quinone and menadione; other vicinal dicarbonyls, e.g., methylglyoxal and phenylglyoxal; monoaldehydes, e.g., p-nitrobenzaldehyde; and monoketones, e.g., acetophenone, acetoin, propiophenone and benzylacetone. Rutin, dicoumarol, indomethacin, and ethacrynic acid inhibited the enzyme activity toward either a carbonyl compound of a non-pteridine derivative or sepiapterin as substrate. Sepiapterin reductase is quite similar to general aldo-keto reductases, especially to carbonyl reductase.
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Petrova MA. [Alcohol dehydrogenase in the blood and liver of rats with different alcoholic motivation]. Biull Eksp Biol Med 1985; 100:583-4. [PMID: 3904864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Alcohol dehydrogenase (ADH) activity was determined by a highly sensitive method. The enzyme activity in the blood serum was similar in alcohol and water preferring rats, while ADH activity in the liver of alcohol preferring rats was higher than in water preferring rats. In rats, chronically intoxicated with ethanol, ADH activity in the liver decreased, while in the serum it was twice higher than the normal level. It is suggested that high level of blood ADH is not connected with the rate of enzyme synthesis in the liver.
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Sulaiman ST, Saleem MM. Sensitive method for the measurement of alcohol dehydrogenase activity in human serum by differential-pulse polarography. Analyst 1985; 110:1193-5. [PMID: 3909846 DOI: 10.1039/an9851001193] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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46
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Kato S. [Experimental study on the significance of serum alcohol dehydrogenase activity--special reference to indicators of hepatic zone 3 damage]. Nihon Shokakibyo Gakkai Zasshi 1985; 82:2074-81. [PMID: 3912568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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47
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Bijsterbosch MK, Duursma AM, Smit MJ, Bos OJ, Bouma JM, Gruber M. Several dehydrogenases and kinases compete for endocytosis from plasma by rat tissues. Biochem J 1985; 229:409-17. [PMID: 2994634 PMCID: PMC1145073 DOI: 10.1042/bj2290409] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Plasma contains many enzymes that are probably derived from damaged cells. These enzymes are cleared at characteristic rates. We showed previously that in rats the rapid clearance of alcohol dehydrogenase, lactate dehydrogenase M4 and the mitochondrial and cytosolic isoenzymes of malate dehydrogenase is largely due to endocytosis by macrophages in liver, spleen and bone marrow. We now demonstrate that uptake of each of the enzymes by these tissues is in general decreased by simultaneous injection of a high dose of one of the other dehydrogenases or a high dose of adenylate kinase or creatine kinase. A similar dose of colloidal albumin did not significantly decrease uptake of the four dehydrogenases. Nor was uptake of colloidal albumin, apo-peroxidase from horseradish or multilamellar liposomes influenced by a high dose of mitochondrial malate dehydrogenase. These results indicate that the four dehydrogenases and the two kinases are specifically endocytosed via the same receptor. We suggest that this receptor contains a group, possibly a nucleotide, with affinity for the nucleotide-binding sites of the enzymes.
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Borodkin IS, Bokiĭ IV, Usatenko MS, Sokolovskaia NE, Petrova MA. [Alcohol dehydrogenase activity of human and animal blood serum in acute and chronic alcoholic intoxication]. Farmakol Toksikol 1985; 48:99-103. [PMID: 3896845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Alcohol dehydrogenase activity (ADH; KP 1.1.1.1.) in blood serum of rats and rabbits is 1 and 2 orders of magnitude higher than in humans. In chronic alcoholics, blood ADN is activated with an increase in alcoholism standing. Twelve hours after acute alcoholic intoxication alcoholics and heavy drinkers manifest a significant reduction in blood ADH activity. Acute alcoholic intoxication does not influence blood ADH in men who do not abuse alcohol. Chronic exposure of rabbits to ethanol leads to a decrease in ADH activity in the liver and to its rise in the blood. ADH activation is observed only in those animals which demonstrate the signs of fatty and protein liver dystrophy. It is concluded that chronic exposure to ethanol does not induce ADH synthesis in the liver. The blood ADH content ascends as a results of an increase in ADH transport from hepatocytes to the bloodstream.
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Kato S, Ishii H, Kano S, Hagihara S, Todoroki T, Nagata S, Takahashi H, Shigeta Y, Tsuchiya M. Alcohol dehydrogenase: a new sensitive marker of hepatic centrilobular damage. Alcohol 1985; 2:35-8. [PMID: 3160368 DOI: 10.1016/0741-8329(85)90011-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
To determine whether serum alcohol dehydrogenase (ADH) activity reflects hepatic damage of centrilobular region (zone 3), the rats were given either bromobenzene (BB) or allyl alcohol (AA) IP to produce the pericen tral or periportal necrosis respectively. After AA or BB serum alanine aminotransferase (ALT) activity showed no significant difference between the two groups. By contrast, serum ADH and glutamate dehydrogenase (GLDH) activities were elevated preferentially in the BB treated rats. However, AA administration to rats also resulted in a significant increase in GLDH activity, whereas ADH activity was only slightly elevated when compared to controls. Moreover, acute ethanol administration to rats resulted in a significant elevation of the serum ADH activity, whereas serum GLDH and ALT activities remained normal. These data suggest that serum ADH activity appears to be a sensitive and specific marker of hepatic centrilobular damage.
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Kershengol'ts BM, Alekseev VG, Gavrilova EM, Li NG. [Various causes of decreased aldehyde dehydrogenase activity in the rat liver and blood in chronic alcoholic intoxication]. Vopr Med Khim 1985; 31:47-51. [PMID: 3157266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Dynamics of accumulation of alcohol- and aldehyde dehydrogenases inhibitors in liver tissue of rats with chronic alcohol intoxication showed that content of the bioinhibitors of protein nature was increased during the animals alcoholization, whereas inhibition of aldehyde dehydrogenase was more distinct as compared with alcohol dehydrogenase. When the nature of aldehyde dehydrogenase inhibitor was studied using the immunoenzyme analysis, the inhibitor proved to be an autoantibody, produced in chronic alcoholization of rats as a result apparently of the enzyme modification. Titre of specific antibodies to "autoantigen" (aldehyde dehydrogenase from liver tissue of alcohol consuming rats) was 12-16-fold higher in liver tissue and blood serum of rats with alcoholism as compared with the corresponding preparations of control animals. An immuno-enzymological mechanism, responsible for an increase of acetaldehyde content in blood developed after ethanol consumption in alcoholism, is discussed.
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