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Hogervorst JG, Godschalk RW, van den Brandt PA, Weijenberg MP, Verhage BA, Jonkers L, Goessens J, Simons CC, Vermeesch JR, van Schooten FJ, Schouten LJ. DNA from Nails for Genetic Analyses in Large-Scale Epidemiologic Studies. Cancer Epidemiol Biomarkers Prev 2014; 23:2703-12. [DOI: 10.1158/1055-9965.epi-14-0552] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Preuner S, Danzer M, Pröll J, Pötschger U, Lawitschka A, Gabriel C, Lion T. High-Quality DNA from Fingernails for Genetic Analysis. J Mol Diagn 2014; 16:459-66. [DOI: 10.1016/j.jmoldx.2014.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 02/27/2014] [Accepted: 02/28/2014] [Indexed: 01/18/2023] Open
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Park J, Liang D, Kim JW, Luo Y, Huang T, Kim SY, Chang SS. Nail DNA and possible biomarkers: a pilot study. J Prev Med Public Health 2012; 45:235-43. [PMID: 22880155 PMCID: PMC3412986 DOI: 10.3961/jpmph.2012.45.4.235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2011] [Accepted: 02/02/2012] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVES Nail has been a substitute DNA source for genotyping. To investigate the integrity and consistency of nail DNA amplification for biomarker study, nail clippings from 12 subjects were collected at monthly intervals. The possibility of longer amplification and existence of GAPDH RNA/protein, were also investigated with three nail samples. METHODS Three primer sets were designed for quantitative amplification of nuclear and mitochondrial genes and analysis of their consistency. The mean threshold cycles in amplification of the target genes were compared to test the consistency of polymerase chain reaction (PCR) performance among individual factors including age groups, sex, family, the nail source, and by the size of the amplification segments. RESULTS The amplification of the target genes from nail DNA showed similar integrity and consistency between the nail sources, and among the serial collections. However, nail DNA from those in their forties showed earlier threshold cycles in amplification than those in their teens or seventies. Mitochondrial DNA (mtDNA) showed better DNA integrity and consistency in amplification of all three targets than did nuclear DNA (nucDNA). Over 9 kb of mtDNA was successfully amplified, and nested quantitative PCR showed reliable copy numbers (%) between the two loci. Reverse transcription PCR for mRNA and immunoblotting for GAPDH protein successfully reflected their corresponding amounts. Regarding the existence of RNA and protein in nails, more effective extraction and detection methods need to be set up to validate the feasibility in biomarker study. CONCLUSIONS Nail DNA might be a feasible intra-individual monitoring biomarker. Considering integrity and consistency in target amplification, mtDNA would be a better target for biomarker research than nucDNA.
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Affiliation(s)
- Joshua Park
- Genetic Epidemiology Research Institute, University of California, Irvine, USA
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Katagiri A, Nakayama K, Rahman MT, Rahman M, Yeasmin S, Ishikawa M, Iida K, Nakayama N, Miyazaki K. MEK inhibition suppresses cell invasion and migration in ovarian cancers with activation of ERK1/2. Exp Ther Med 2010; 1:591-596. [PMID: 22993581 DOI: 10.3892/etm_00000093] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Accepted: 05/03/2010] [Indexed: 11/05/2022] Open
Abstract
The extracellular-regulated kinase (ERK) signaling pathway plays an important role in regulating the malignant potential of a cancer cell. However, the effect of ERK signaling on cancer metastasis is not clearly understood. In the present study, we examined the status of ERK activation in 88 ovarian carcinomas in order to clarify the clinicopathological and prognostic significance of phosphorylated ERK1/2 (p-ERK1/2). p-ERK1/2 expression was identified in 37 (42%) of 88 ovarian carcinomas. There was no significant correlation between p-ERK1/2 expression and any of the clinicopathological factors tested. No significant correlation between p-ERK1/2 expression and overall survival was found in patients with ovarian carcinoma treated with platinum and taxane chemotherapy (P=0.426). Next, to clarify the role of ERK1/2 activation in ovarian cancers, we inactivated ERK1/2 in ovarian cancer cells using the MEK inhibitor, CI-1040, which prevents ERK1/2 activation. Based on simulated wound healing and invasion chamber assays, we found that the motility and invasion of ES2 and MPSC1 cells with p-ERK1/2 were significantly reduced (P<0.01) after treatment with CI-1040. By contrast, CI-1040 did not have any effect on KF28 cells, which were negative for p-ERK1/2. Twist was down-regulated simultaneously with p-ERK1/2 following treatment of ES2 and MPSC1 cells with CI-1040. Immunohistochemistry of ovarian carcinoma tissue revealed that the increased expression of p-ERK1/2 significantly correlated with Twist expression (P<0.01). The findings in this study provide new insight into the biological role of ERK signaling in ovarian carcinomas. Additionally, our observations have an important therapeutic implication for patients with ovarian cancers that express p-ERK1/2 as these patients may potentially benefit from CI-1040 therapy.
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Affiliation(s)
- Atsuko Katagiri
- Departments of Obstetrics and Gynecology, Shimane University School of Medicine, Shimane 6938501, Japan
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Nakashima M, Tsuda M, Kinoshita A, Kishino T, Kondo S, Shimokawa O, Niikawa N, Yoshiura KI. Precision of high-throughput single-nucleotide polymorphism genotyping with fingernail DNA: comparison with blood DNA. Clin Chem 2008; 54:1746-8. [PMID: 18824581 DOI: 10.1373/clinchem.2008.108225] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Isaza C, Henao J, Martínez JHI, Arias JCS, Beltrán L. Phenotype-genotype analysis of CYP2C19 in Colombian mestizo individuals. BMC CLINICAL PHARMACOLOGY 2007; 7:6. [PMID: 17623107 PMCID: PMC1950696 DOI: 10.1186/1472-6904-7-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Accepted: 07/11/2007] [Indexed: 01/24/2023]
Abstract
Background Omeprazole is metabolized by the hepatic cytochrome P450 (CYP) 2C19 enzyme to 5-hydroxyomeprazole. CYP2C19 exhibits genetic polymorphisms responsible for the presence of poor metabolizers (PMs), intermediate metabolizers (IMs) and extensive metabolizers (EMs). The defective mutations of the enzyme and their frequencies change between different ethnic groups; however, the polymorphism of the CYP2C19 gene has not been studied in Colombian mestizos. The aim of this study was to evaluate the genotype and phenotype status of CYP2C19 in Colombian mestizos, in order to contribute to the use of appropriate strategies of drug therapy for this population. Methods 189 subjects were genotyped using the multiplex SNaPshot technique and a subgroup of 44 individuals received 20 mg of omeprazole followed by blood collection at 3 hours to determine the omeprazole hydroxylation index by HPLC. Results 83.6%, 15.3% and 1.1% of the subjects were genotyped as EMs, IMs and PMs, respectively. The frequencies of the CYP2C29*1 and CYP2C19*2 alleles were 91.3% and 8.7% respectively whereas the *3, *4, *5, *6 and *8 alleles were not found. No discrepancies were found between the genotype and phenotype of CYP2C19. Conclusion The frequency of poor metabolizers (1.1%) in the Colombian mestizos included in this study is similar to that in Bolivian mestizos (1%) but lower than in Mexican-Americans (3.2%), West Mexicans (6%), Caucasians (5%) and African Americans (5.4%). The results of this study will be useful for drug dosage recommendations in Colombian mestizos.
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Affiliation(s)
- Carlos Isaza
- Grupo de Investigación en Farmacogenética, Universidad Tecnológica de Pereira, Facultad de Ciencias de la Salud, La Julita, Pereira, Colombia, South America
| | - Julieta Henao
- Grupo de Investigación en Farmacogenética, Universidad Tecnológica de Pereira, Facultad de Ciencias de la Salud, La Julita, Pereira, Colombia, South America
| | - José H Isaza Martínez
- Grupo Polifenoles UTP-CENIVAM, Facultad de Tecnología, Escuela de Química, Universidad Tecnológica de Pereira, Pereira, Colombia, South America
| | - Juan C Sepúlveda Arias
- Grupo de Investigación en Farmacogenética, Universidad Tecnológica de Pereira, Facultad de Ciencias de la Salud, La Julita, Pereira, Colombia, South America
| | - Leonardo Beltrán
- Grupo de Investigación en Farmacogenética, Universidad Tecnológica de Pereira, Facultad de Ciencias de la Salud, La Julita, Pereira, Colombia, South America
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Rogers NL, Cole SA, Lan HC, Crossa A, Demerath EW. New saliva DNA collection method compared to buccal cell collection techniques for epidemiological studies. Am J Hum Biol 2007; 19:319-26. [PMID: 17421001 PMCID: PMC2797479 DOI: 10.1002/ajhb.20586] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Epidemiological studies may require noninvasive methods for off-site DNA collection. We compared the DNA yield and quality obtained using a whole-saliva collection device (Oragene DNA collection kit) to those from three established noninvasive methods (cytobrush, foam swab, and oral rinse). Each method was tested on 17 adult volunteers from our center, using a random crossover collection design and analyzed using repeated-measures statistics. DNA yield and quality were assessed via gel electrophoresis, spectophotometry, and polymerase chain reaction (PCR) amplification rate. The whole-saliva method provided a significantly greater DNA yield (mean +/- SD = 154.9 +/- 103.05 microg, median = 181.88) than the other methods (oral rinse = 54.74 +/- 41.72 microg, 36.56; swab = 11.44 +/- 7.39 microg, 10.72; cytobrush = 12.66 +/- 6.19, 13.22 microg) (all pairwise P < 0.05). Oral-rinse and whole-saliva samples provided the best DNA quality, whereas cytobrush and swab samples provided poorer quality DNA, as shown by lower OD(260)/OD(280) and OD(260)/OD(230) ratios. We conclude that both a 10-ml oral-rinse sample and 2-ml whole-saliva sample provide sufficient DNA quantity and better quality DNA for genetic epidemiological studies than do the commonly used buccal swab and brush techniques.
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Affiliation(s)
- Nikki L Rogers
- Lifespan Health Research Center, Department of Community Health, Wright State University School of Medicine, Dayton, Ohio 45420, USA.
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Leanza SM, Burk RD, Rohan TE. Whole genome amplification of DNA extracted from hair samples: Potential for use in molecular epidemiologic studies. ACTA ACUST UNITED AC 2007; 31:480-8. [DOI: 10.1016/j.cdp.2007.10.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2007] [Indexed: 10/22/2022]
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Köbel M, Pohl G, Schmitt WD, Hauptmann S, Wang TL, Shih IM. Activation of mitogen-activated protein kinase is required for migration and invasion of placental site trophoblastic tumor. THE AMERICAN JOURNAL OF PATHOLOGY 2005; 167:879-85. [PMID: 16127165 PMCID: PMC1698728 DOI: 10.1016/s0002-9440(10)62059-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Placental site trophoblastic tumor (PSTT) is a gestational neoplasm derived from the extravillous (intermediate) trophoblast of the implantation site. PSTT is characterized by a highly invasive phenotype, but the molecular mechanisms are poorly understood. In this report, we demonstrate that PSTTs expressed the activated (phosphorylated) form of mitogen-activated protein kinase (MAPK) in 84% of cases, whereas the normal extravillous trophoblastic cells did not. To characterize the role of MAPK activation in PSTT, we established the first PSTT cell culture, IST-2, from a surgically resected PSTT. IST-2 cells expressed HLA-G and Mel-CAM but not E-cadherin, an immunophenotype characteristic of PSTT. IST-2 cells were highly motile and invasive in culture as compared to choriocarcinoma JEG-3 cells and normal extravillous trophoblastic cells. Based on wound assay, time-lapse videomicroscopy for cell tracking, and invasion chamber assays, we found that the motility and invasion of IST-2 cells were significantly reduced (P<0.01) after treatment with the MEK inhibitors CI-1040 and PD 59089, which prevent activation of MAPK. In contrast, neither compound had any effect on normal extravillous trophoblastic cells or JEG-3 cells. In conclusion, our findings demonstrate a functional role of MAPK activation in the motility and invasion of PSTT.
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Affiliation(s)
- Martin Köbel
- Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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Ribeiro CNM, Peres LC, Pina-Neto JM. DNA extraction and quantification from touch and scrape preparations obtained from autopsy liver cells. Braz J Med Biol Res 2004; 37:635-42. [PMID: 15107923 DOI: 10.1590/s0100-879x2004000500002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The objective of the present study was to develop a simplified low cost method for the collection and fixation of pediatric autopsy cells and to determine the quantitative and qualitative adequacy of extracted DNA. Touch and scrape preparations of pediatric liver cells were obtained from 15 cadavers at autopsy and fixed in 95% ethanol or 3:1 methanol:acetic acid. Material prepared by each fixation procedure was submitted to DNA extraction with the Wizard genomic DNA purification kit for DNA quantification and five of the preparations were amplified by multiplex PCR (azoospermia factor genes). The amount of DNA extracted varied from 20 to 8,640 microg, with significant differences between fixation methods. Scrape preparation fixed in 95% ethanol provided larger amount of extracted DNA. However, the mean for all groups was higher than the quantity needed for PCR (50 ng) or Southern blot (500 ng). There were no qualitative differences among the different material and fixatives. The same results were also obtained for glass slides stored at room temperature for 6, 12, 18 and 24 months. We conclude that touch and scrape preparations fixed in 95% ethanol are a good source of DNA and present fewer limitations than cell culture, tissue paraffin embedding or freezing that require sterile material, culture medium, laboratory equipment and trained technicians. In addition, they are more practical and less labor intensive and can be obtained and stored for a long time at low cost.
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Affiliation(s)
- C N M Ribeiro
- Departamento de Patologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirao Preto, SP, Brazil
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Wang SS, Thornton K, Kuhn AM, Nadeau JG, Hellyer TJ. Homogeneous real-time detection of single-nucleotide polymorphisms by strand displacement amplification on the BD ProbeTec ET system. Clin Chem 2003; 49:1599-607. [PMID: 14500584 DOI: 10.1373/49.10.1599] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND The BD ProbeTec ET System is based on isothermal strand displacement amplification (SDA) of target nucleic acid coupled with homogeneous real-time detection using fluorescent probes. We have developed a novel, rapid method using this platform that incorporates a universal detection format for identification of single-nucleotide polymorphisms (SNPs) and other genotypic variations. METHOD The system uses a common pair of fluorescent Detector Probes in conjunction with unlabeled allele-specific Adapter Primers and a universal buffer chemistry to permit analysis of multiple SNP loci under generic assay conditions. We used Detector Probes labeled with different dyes to facilitate differentiation of two alternative alleles in a single reaction with no postamplification manipulation. We analyzed six SNPs within the human beta(2)-adrenergic receptor (beta(2)AR) gene, using whole blood, buccal swabs, and urine samples, and compared results with those obtained by DNA sequencing. RESULTS Unprocessed whole blood was successfully genotyped with as little as 0.1-1 micro L of sample per reaction. All six beta(2)AR assays were able to accommodate >/==" BORDER="0">20 micro L of unprocessed whole blood. For the 14 individuals tested, genotypes determined with the six beta(2)AR assays agreed with DNA sequencing results. CONCLUSION SDA-based allelic differentiation on the BD ProbeTec ET System can detect SNPs rapidly, using whole blood, buccal swabs, or urine.
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Affiliation(s)
- Sha-Sha Wang
- BD Diagnostic Systems, 54 Loveton Circle, Sparks, MD 21152, USA
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Shimizu T, Ochiai H, Asell F, Shimizu H, Saitoh R, Hama Y, Katada J, Hashimoto M, Matsui H, Taki K, Kaminuma T, Yamamoto M, Aida Y, Ohashi A, Ozawa N. Bioinformatics Research on Inter-racial Difference in Drug Metabolism I. Analysis on Frequencies of Mutant Alleles and Poor Metabolizers on CYP2D6 and CYP2C19. Drug Metab Pharmacokinet 2003; 18:48-70. [PMID: 15618719 DOI: 10.2133/dmpk.18.48] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The enzyme activities of CYP2D6 and CYP2C19 show a genetic polymorphism, and the frequency of poor metabolizers (PMs) on these enzymes depends on races. In the present study, the frequencies of mutant alleles and PMs in each race were analyzed based on information from published studies, considering the genetic polymorphisms of CYP2D6 and CYP2C19 as the causal factors of racial and inter-individual differences in pharmacokinetics. As a result, it was shown that there were racial differences in the frequencies of each mutant allele and PMs. The frequencies of PMs on CYP2D6 are 1.9% of Asians and 7.7% of Caucasians, and those of PMs on CYP2C19 are 15.8% of Asians and 2.2% of Caucasians. Based on the results, it was suggested that there would be racial differences in the frequencies of PM subjects whose blood concentrations might be higher for drugs metabolized by these enzymes. Additionally, it was suggested that enzyme activities would vary according to the number of functional alleles even in subjects judged to be extensive metabolizers (EMs). In the bridging study, genetic information regarding CYP2D6 and CYP2C19 of the subjects will help extrapolate foreign clinical data to a domestic population.
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Vijgen L, Van Gysel M, Rector A, Thoelen I, Esters N, Ceelen T, Vangoidsenhoven E, Vermeire S, Rutgeerts P, Van Ranst M. Interleukin-1 receptor antagonist VNTR-polymorphism in inflammatory bowel disease. Genes Immun 2002; 3:400-6. [PMID: 12424621 DOI: 10.1038/sj.gene.6363888] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Both genetic and environmental factors have been implicated in the etiology of inflammatory bowel diseases (IBD) i.e., Crohn's disease (CD) and ulcerative colitis (UC). Polymorphisms in cytokine genes are likely to influence an individual's predisposition to IBD. In intron 2 of the interleukin-1 receptor antagonist (IL-1ra) gene, a variable number of an 86-bp tandem repeat (VNTR) polymorphism leads to the existence of five different alleles. In order to analyze the association between certain IL-1ra VNTR-alleles and IBD, we investigated the IL-1ra genotype and allele frequencies in 342 unrelated IBD patients and in 401 healthy control individuals. CD patients were also genotyped for the three main associated variants in the NOD2/CARD15 gene. In the IBD group, a significant decrease in the frequency of IL-1ra allele 1 (P=0.048) compared to controls was observed. The frequency of IL-1ra genotype 1/1 was significantly lower in the IBD population vs the control group (P=0.018). Analysis of the CD population without NOD2 homozygotes and compound heterozygotes revealed a more significant decrease in IL-1ra genotype 1/1 compared to controls (P=0.038). These results support the hypothesis that the IL-1ra VNTR-polymorphism could be among the genetic factors that are of importance in IBD susceptibility.
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Affiliation(s)
- L Vijgen
- Laboratory of Clinical & Epidemiological Virology, Department of Microbiology & Immunology, Rega Institute for Medical Research, Leuven, Belgium
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Kita T, Sakaeda T, Adachi S, Sakai T, Aoyama N, Hatanaka H, Kasuga M, Okumura K. N-Acetyltransferase 2 genotype correlates with sulfasalazine pharmacokinetics after multiple dosing in healthy Japanese subjects. Biol Pharm Bull 2001; 24:1176-80. [PMID: 11642327 DOI: 10.1248/bpb.24.1176] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sulfapyridine (SP) is metabolized by polymorphic N-acetyltransferase 2 (NAT2) [EC 2.3.1.5]. In this study, the correlation between the NAT2 genotype and the pharmacokinetics of SP after multiple oral dosing of sulfasalazine (SASP) was examined to elucidate the effect of multiple dosing on the predictability of the phenotype by NAT2 genotyping. Seven healthy subjects were classified into two groups; the homozygotes for the wild-type allele, NAT2*4/*4 (Group I) and the compound heterozygotes for the mutant allele (NAT2*4/*6A or NAT2*4/*7B) (Group II). All received once-daily 1 g of SASP (Salazopyrin) orally for 8 d. Plasma concentrations and urinary recoveries of SASP, SP and N-acetylsulfapyridine (AcSP) were monitored for 8 d. At 24 h on Day 1, the plasma concentration of SASP was lower and those of SP and AcSP were higher in Group II compared with Group I, but there was no significant difference. The plasma concentration ratio of AcSP to SP (AcSP/SP) tended to be lower in Group II. Urinary recoveries of SP and AcSP were increased in Group II, and their ratio was slightly reduced in Group II. Multiple dosing for 8 d resulted in an increase in the plasma concentrations of SASP, SP and AcSP. The difference between Group I and II was marked compared with single dosing, resulting in a significant difference in the plasma concentration of SP and the ratio of AcSP/SP. The simple input-output pharmacokinetic model applied for the analysis of plasma concentrations and urinary recoveries of SP and AcSP suggested the acetylation of SP into AcSP was 2.7-fold reduced in Group II (p=0.064).
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Affiliation(s)
- T Kita
- Department of Hospital Pharmacy, School of Medicine, Kobe University, Japan
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