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Langlois MR, Delanghe JR. Is it time to apply genographics in medical diagnosis? Acta Clin Belg 2012; 67:387-388. [PMID: 23340141 DOI: 10.2143/acb.67.6.2062700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
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Langlois MR, Delanghe JR, De Buyzere M, Rietzschel E, De Bacquer D. Unanswered questions in including HDL-cholesterol in the cardiovascular risk estimation. Is time still on our side? Atherosclerosis 2012; 226:296-8. [PMID: 23102787 DOI: 10.1016/j.atherosclerosis.2012.10.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 10/08/2012] [Accepted: 10/10/2012] [Indexed: 11/16/2022]
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Ollivier L, Sellier P, Monin G, Langlois MR, Dando P, Felgines C, Talmant A, Tastu D, Vernin P. [Not Available]. ACTA ACUST UNITED AC 2012; 10:191-208. [PMID: 22896097 PMCID: PMC2718896 DOI: 10.1186/1297-9686-10-2-191] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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King W, Ollivier L, Basrur PK, Langlois MR. Erythrocyte osmotic response test on malignant hyperthermia-susceptible pigs. ACTA ACUST UNITED AC 2012; 8:537-40. [PMID: 22896511 PMCID: PMC2724579 DOI: 10.1186/1297-9686-8-4-537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Langlois MR. Laboratory approaches for predicting and managing the risk of cardiovascular disease: postanalytical opportunities of lipid and lipoprotein testing. Clin Chem Lab Med 2012; 50:1169-81. [DOI: 10.1515/cclm-2011-0636] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Accepted: 03/19/2012] [Indexed: 11/15/2022]
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Delanghe JR, Langlois MR, De Buyzere ML. Haptoglobin polymorphism: a key factor in the proatherogenic role of B cells? Atherosclerosis 2011; 217:80-2. [PMID: 21507405 DOI: 10.1016/j.atherosclerosis.2011.03.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 03/02/2011] [Accepted: 03/11/2011] [Indexed: 10/18/2022]
Abstract
B cells play a role in atherosclerosis. B lymphocytes may reduce the progression of vascular disease. Antibody production against modified auto-antigens is an element in the atheroprotective involvement of B lymphocytes. Paradoxical evidence is emerging from animal studies that suggest a proatherogenic B-cell behaviour independently of autoantibody production. One aspect that has received limited consideration is the role of genetic susceptibility modulated by extracellular matrix proteins. Haptoglobin is a polymorphic glycoprotein that binds to CD22 on B lymphocytes. Hp phenotypes show an important molecular heterogeneity. Hp 2-2 has been linked to an increased susceptibility for atherosclerosis. Haptoglobin and its polymorphism play a role in B-cell migration and function. Hp phenotypes may influence B-T cell dialogue and T cell activation. Haptoglobin is involved in the interplay of lymphocytes, neutrophils, and monocytes. Haptoglobin binds to the CD11b/CD18 receptor and to mast cells. HDL particles can become pro-inflammatory through interactions of Hp-Hb complexes with apolipoprotein A1. Haptoglobin is a chemoattractant to pre-B lymphocytes and monocytes. Beyond the conventional view of haptoglobin as a marker of hemolysis, several findings point towards an immunomodulatory effect of haptoglobin in B-cell mediated progression of atherosclerosis. The balance between proatherogenic and protective immunological properties of the different Hp phenotypes determines if lesions progress or regress. Clinical studies indicate a strong association between the Hp 2-2 phenotype and a more frequent onset of diabetic complications and cardiovascular disease. Findings in animal models (where no haptoglobin polymorphism is present) cannot always be extrapolated to humans.
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De Meyer T, Sinnaeve D, Van Gasse B, Rietzschel ER, De Buyzere ML, Langlois MR, Bekaert S, Martins JC, Van Criekinge W. Evaluation of standard and advanced preprocessing methods for the univariate analysis of blood serum 1H-NMR spectra. Anal Bioanal Chem 2010; 398:1781-90. [PMID: 20714889 DOI: 10.1007/s00216-010-4085-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 07/30/2010] [Accepted: 08/02/2010] [Indexed: 12/12/2022]
Abstract
Proton nuclear magnetic resonance ((1)H-NMR)-based metabolomics enables the high-resolution and high-throughput assessment of a broad spectrum of metabolites in biofluids. Despite the straightforward character of the experimental methodology, the analysis of spectral profiles is rather complex, particularly due to the requirement of numerous data preprocessing steps. Here, we evaluate how several of the most common preprocessing procedures affect the subsequent univariate analyses of blood serum spectra, with a particular focus on how the standard methods perform compared to more advanced examples. Carr-Purcell-Meiboom-Gill 1D (1)H spectra were obtained for 240 serum samples from healthy subjects of the Asklepios study. We studied the impact of different preprocessing steps--integral (standard method) and probabilistic quotient normalization; no, equidistant (standard), and adaptive-intelligent binning; mean (standard) and maximum bin intensity data summation--on the resonance intensities of three different types of metabolites: triglycerides, glucose, and creatinine. The effects were evaluated by correlating the differently preprocessed NMR data with the independently measured metabolite concentrations. The analyses revealed that the standard methods performed inferiorly and that a combination of probabilistic quotient normalization after adaptive-intelligent binning and maximum intensity variable definition yielded the best overall results (triglycerides, R = 0.98; glucose, R = 0.76; creatinine, R = 0.70). Therefore, at least in the case of serum metabolomics, these or equivalent methods should be preferred above the standard preprocessing methods, particularly for univariate analyses. Additional optimization of the normalization procedure might further improve the analyses.
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Speeckaert MM, Segers H, Van Biesen W, Verstraete A, Langlois MR, Delanghe JR. An unusual case of (pseudo)hypertriglyceridaemia. NDT Plus 2010; 3:570-2. [PMID: 25949470 PMCID: PMC4421427 DOI: 10.1093/ndtplus/sfq148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Accepted: 07/15/2010] [Indexed: 12/04/2022] Open
Abstract
A high concentration of glycerol in plasma is an interfering factor in the determination of triglycerides, giving rise to (pseudo)hypertriglyceridaemia. Hyperglycerolaemia may be due to the presence of exogenous glycerol or due to endogenous glycerol accumulation. In the present case report, a 57-year-old male patient with end-stage renal disease presented with a pseudohypertriglyceridaemia based on a pronounced hyperglycerolaemia. The hyperglycerolaemia was due to chronic intake of glycerol-containing alcoholic beverages in combination with a reduced glycerol clearance and glycerol kinase activity. In conclusion, an unexplained hypertriglyceridaemia in patients with an impaired renal function should raise the suspicion of hyperglycerolaemia.
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Vandermeersch A, Ameye S, Puype D, Petitjean D, De Buyzere M, Langlois MR. Estimation of the low-density lipoprotein (LDL) subclass phenotype using a direct, automated assay of small dense LDL-cholesterol without sample pretreatment. Clin Chim Acta 2010; 411:1361-6. [PMID: 20561981 DOI: 10.1016/j.cca.2010.05.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2010] [Revised: 05/11/2010] [Accepted: 05/26/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND A new method (sLDL-EX "SEIKEN") is commercially available for the direct quantification of small dense LDL-cholesterol (sd-LDL) on automated chemistry analyzers, without manual sample pretreatment. We evaluated the performance of this direct assay to estimate the small dense LDL subclass phenotype ("non-A"), defined by polyacrylamide gel tube electrophoresis. METHODS Fasting serum samples from 189 healthy subjects (age 18-75y, 96 females) were collected. The direct sd-LDL assay (from Randox Laboratories) was applied on a Roche Modular P analyzer. The Quantimetrix Lipoprint(TM) LDL System was used to define LDL subclass phenotypes (A and non-A). ROC curve analysis was performed for sd-LDL and other lipids and apolipoproteins (apo) with respect to phenotype non-A. RESULTS sd-LDL concentrations (40.4+/-18.6mg/dl) in the total group correlated (P<0.0001) with apoB (r=0.831), apoB/A-I ratio (r=0.757), non-HDL-cholesterol (r=0.821), triglycerides (r=0.439), and LDL-cholesterol (r=0.641). Higher sd-LDL concentrations (P<0.0001) were measured in subjects with LDL phenotype non-A (53.6+/-17.0mg/dl, n=92) than in those with phenotype A (27.9+/-8.9mg/dl, n=97). In logistic regression analysis, sd-LDL and apoA-I were independently associated with LDL subclass phenotype non-A. Highest areas under ROC curves were obtained for sd-LDL (0.943), triglycerides (0.833), triglyceride/HDL-cholesterol (0.838) and apoB/A-I ratio (0.826) to predict phenotype non-A. The sd-LDL cut-off point for optimal sensitivity (87.9%) and specificity (92.8%) was >38.5mg/dl. CONCLUSIONS The direct, homogeneous sd-LDL method is easily applicable on an automated chemistry analyzer and shows acceptable performance to estimate the electrophoretic LDL subclass phenotype.
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Langlois MR, De Buyzere ML, Delanghe JR. Plasma vitamin C for predicting cardiovascular disease: more than a nutritional biomarker. Acta Clin Belg 2009; 64:341-3. [PMID: 19810422 DOI: 10.1179/acb.2009.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Verhoye E, Van den Bruel A, Delanghe JR, Debruyne E, Langlois MR. Spuriously high thyrotropin values due to anti-thyrotropin antibodies in adult patients. Clin Chem Lab Med 2009; 47:604-6. [DOI: 10.1515/cclm.2009.138] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Verhoye E, Langlois MR. Circulating oxidized low-density lipoprotein: a biomarker of atherosclerosis and cardiovascular risk? Clin Chem Lab Med 2009; 47:128-37. [DOI: 10.1515/cclm.2009.037] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractLow-density lipoproteins (LDLs) are susceptible to structural modifications by oxidation, particularly the small dense LDL particles. The formation of lipid peroxidation derivates, such as thiobarbituric reactive substances, conjugated dienes, lipid hydroperoxides, and aldehydes, is associated with changes in apolipoprotein conformation and affects the functional properties of LDLs. Oxidized LDL (oxLDL) formation in the subendothelial space of the arterial wall is a key initiating step in atherosclerosis because it contributes to foam cell generation, endothelial dysfunction, and inflammatory processes. In the last decade, immunoassays were developed using monoclonal antibodies against oxidation-dependent epitopes of LDL which made it possible to directly measure oxLDL in the circulation. Increased circulating oxLDL concentrations have been related to cardiovascular disease in some studies, although not always independently after adjustment of classical lipid markers. The Asklepios Study, investigating 2524 healthy middle-aged subjects, showed that circulating oxLDL is affected by many biological and lifestyle factors, as well as (generalized) subclinical atherosclerosis.Clin Chem Lab Med 2009;47:128–37.
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Langlois MR, Wallemacq P. The future of hospital laboratories. Position statement from the Royal Belgian Society of Clinical Chemistry (RBSCC). Clin Chem Lab Med 2009; 47:1195-201. [DOI: 10.1515/cclm.2009.271] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Langlois MR, Rietzschel ER, De Buyzere ML, De Bacquer D, Bekaert S, Blaton V, De Backer GG, Gillebert TC. Femoral Plaques Confound the Association of Circulating Oxidized Low-Density Lipoprotein With Carotid Atherosclerosis in a General Population Aged 35 to 55 Years. Arterioscler Thromb Vasc Biol 2008; 28:1563-8. [PMID: 18511698 DOI: 10.1161/atvbaha.108.167346] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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De Vriese AS, Borrey D, Mahieu E, Claeys I, Stevens L, Vanhaeverbeke A, Roelens M, Langlois MR. Oral Vitamin C Administration Increases Lipid Peroxidation in Hemodialysis Patients. ACTA ACUST UNITED AC 2007; 108:c28-34. [DOI: 10.1159/000112526] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Accepted: 09/06/2007] [Indexed: 11/19/2022]
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Delanghe JR, Langlois MR, De Buyzere ML, Torck MA. Vitamin C Deficiency and Scurvy Are Not Only a Dietary Problem but Are Codetermined by the Haptoglobin Polymorphism. Clin Chem 2007; 53:1397-400. [PMID: 17644791 DOI: 10.1373/clinchem.2007.088658] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Ascorbic acid (vitamin C) is prone to oxidation in vivo. The human plasma protein haptoglobin (Hp) shows a genetic polymorphism with 3 major phenotypes (Hp 1-1, Hp 2-1, and Hp 2-2) that show important functional differences. Despite an adequate nutritional supply, in Hp 2-2 individuals (most common among Asian populations) vitamin C is markedly lower in concentration and particularly prone to oxidation in vivo. Therefore, susceptibility to subclinical and clinical vitamin C deficiency (scurvy) is partly genetically determined. The genetic advantage of the Hp1 allele as a vitamin C stabilizing factor helps to elucidate the direction and successes of long-distance sea crossing human migrations in history. Clinical trials demonstrated Hp phenotype–related effects of antioxidant treatment. Because vitamin C is a first line antioxidant, Hp polymorphism and its effects on vitamin C have major clinical consequences; a marked difference in genetic susceptibility toward atherosclerosis between Hp phenotypes is attributable to variation in LDL oxidation. The classical view of vitamin C and scurvy being a pure nutritional condition needs to be updated. These findings should foster research investigating the role of Hp polymorphism in human disease, and in vitamin C deficiency and atherosclerosis in particular.
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Borrey D, Moerman E, Cockx A, Engelrelst V, Langlois MR. Column-switching LC-MS/MS analysis for quantitative determination of testosterone in human serum. Clin Chim Acta 2007; 382:134-7. [PMID: 17462614 DOI: 10.1016/j.cca.2007.03.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2007] [Revised: 03/16/2007] [Accepted: 03/16/2007] [Indexed: 11/24/2022]
Abstract
BACKGROUND An accurate measurement of testosterone is needed in many clinical applications for correct diagnosis and appropriate treatment. Our aim was to develop a fast and robust high-throughput LC-MSMS method for quantification of serum testosterone in women. METHODS Testosterone was derivatized by oximation and extracted with methyl tert-butyl ether from 200 microL of serum. Further matrix elimination was achieved on-line using a column-switching LC-method. The instrumental analysis was performed on an API4000 tandem mass spectrometer equipped with an Agilent series 1312A binary pump and an Agilent series 1311A quaternary pump. The MRM transitions were 304-->124 and 304-->112 for testosterone and 307-->124 and 307-->112 for d(3)-testosterone. RESULTS The total analysis time of the column-switching method was 3 min. Linear calibration curves were obtained in the concentration range from 0.035 nmol/L (0.01 microg/L) to 6.92 nmol/L (2 microg/L). Within-day and between-day precision, expressed as the relative standard deviation at four different concentrations ranged from 4.70% to 9.35%. Correlation with the in-house method (solvent-extraction RIA) showed r(2)=0.920. CONCLUSIONS The presented column-switching method offers a simple, fast and economical analysis of testosterone in human serum. The procedure requires only small sample volumes and is well suited for quantification of testosterone in serum from women and children.
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Langlois MR, Blaton VH. Historical milestones in measurement of HDL-cholesterol: Impact on clinical and laboratory practice. Clin Chim Acta 2006; 369:168-78. [PMID: 16579980 DOI: 10.1016/j.cca.2006.01.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2005] [Accepted: 01/31/2006] [Indexed: 11/16/2022]
Abstract
High-density lipoprotein cholesterol (HDL-C) comprises a family of particles with differing physicochemical characteristics. Continuing progress in improving HDL-C analysis has originated from two separate fields-one clinical, reflecting increased attention to HDL-C in estimating risk for coronary heart disease (CHD), and the other analytical, reflecting increased emphasis on finding more reliable and cost-effective HDL-C assays. Epidemiologic and prospective studies established the inverse association of HDL-C with CHD risk, a relationship that is consistent with protective mechanisms demonstrated in basic research and animal studies. Atheroprotective and less atheroprotective HDL subpopulations have been described. Guidelines on primary and secondary CHD prevention, which increased the workload in clinical laboratories, have led to a revolution in HDL-C assay technology. Many analytical techniques including ultracentrifugation, electrophoresis, chromatography, and polyanion precipitation methods have been developed to separate and quantify HDL-C and HDL subclasses. More recently developed homogeneous assays enable direct measurement of HDL-C on an automated analyzer, without the need for manual pretreatment to separate non-HDL. Although homogeneous assays show improved accuracy and precision in normal serum, discrepant results exist in samples with atypical lipoprotein characteristics. Hypertriglyceridemia and monoclonal paraproteins are important interfering factors. A novel approach is nuclear magnetic resonance spectroscopy that allows rapid and reliable analysis of lipoprotein subclasses, which may improve the identification of individuals at increased CHD risk. Apolipoprotein A-I, the major protein of HDL, has been proposed as an alternative cardioprotective marker avoiding the analytical limitations of HDL-C.
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Depypere HT, Langlois MR, Delanghe JR, Temmerman M, Dhont M. Haptoglobin polymorphism in patients with preeclampsia. Clin Chem Lab Med 2006; 44:924-8. [PMID: 16879055 DOI: 10.1515/cclm.2006.182] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractClin Chem Lab Med 2006;44:924–8.
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Borrey DCR, Godderis KO, Engelrelst VIL, Bernard DR, Langlois MR. Quantitative determination of vigabatrin and gabapentin in human serum by gas chromatography-mass spectrometry. Clin Chim Acta 2005; 354:147-51. [PMID: 15748611 DOI: 10.1016/j.cccn.2004.11.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2004] [Revised: 11/18/2004] [Accepted: 11/22/2004] [Indexed: 11/25/2022]
Abstract
BACKGROUND Published methods for routine clinical monitoring of vigabatrin and gabapentin are often very laborious. A simple GC-MS method was developed for the simultaneous quantitative determination of vigabatrin and gabapentin in human serum. METHODS After protein precipitation, the compounds are derivatized by methylation and analysed on a polydimethylsiloxane column using splitless injection. Cyclobarbital is used as the internal standard. To attain maximal sensitivity, detection is performed in selected ion monitoring mode. RESULTS The method was fully validated and linear calibration curves were obtained in the concentration ranges from 5 to 80 microg/mL for vigabatrin and from 5 to 30 microg/mL for gabapentin. The within-day and day-to-day relative standard deviations at three different concentration levels were <10% and <15%, respectively. The limit of quantitation was 2 mug/mL for both compounds. CONCLUSIONS The presented method provides high chromatographic resolution, good sensitivity and unequivocal identification potential and can be used for simultaneous analysis of both antiepileptics.
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Langlois MR, Oorlynck L, Vandekerckhove F, Criel A, Bernard D, Blaton V. Discrepancy between sperm acrosin activity and sperm morphology: significance for fertilization in vitro. Clin Chim Acta 2004; 351:121-9. [PMID: 15563880 DOI: 10.1016/j.cccn.2004.08.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2004] [Revised: 08/17/2004] [Accepted: 08/17/2004] [Indexed: 10/26/2022]
Abstract
BACKGROUND In routine semen analysis, discrepancies may occur between sperm acrosin activity test results and sperm acrosomal morphology. METHODS Discrepant test results of sperm acrosin activity (spectrophotometric assay) vs. sperm morphology (strict criteria) in the initial diagnostic investigation of 107 infertile couples were evaluated with respect to fertilization rate (% oocytes with 2 pronuclei) further obtained in IVF treatment. RESULTS Acrosin activity positively correlated with sperm morphology (% normal forms) (r=0.537) and fertilization rate (r=0.526). ROC curves for the prediction of > or =50% fertilization rate were comparable for acrosin activity and sperm morphology, with optimal cutoff values at 25 microIU/10(6) sperm and 10%, respectively. In multiple regression analysis, sperm acrosin activity (P=0.002) predicted fertilization rate independently of sperm morphology (P<0.001) and sperm vitality (eosin-nigrosin stain) (P=0.03). Acrosin activities > or =25 microIU/10(6) sperm were observed in 36% of severe teratozoospermic samples (< or =4% normal spermatozoa) associated with low fertilization rate. Twenty percent of the morphologically normal ejaculates showed a low acrosin activity (<25 microIU/10(6) sperm) and low hypoosmotic swelling test (HOST) scores (31.4+/-7.6%) and were associated with low fertilization rate. CONCLUSION The sperm acrosin assay can help to predict sperm fertilizing capacity in IVF independently of sperm morphology.
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Langlois MR, De Buyzere ML, Vlierberghe HV, Delanghe JR. Haptoglobin polymorphism and serum ferritin concentration in ageing subjects. Br J Haematol 2004; 124:555-6; author reply 556-7. [PMID: 14984507 DOI: 10.1046/j.1365-2141.2003.04797.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Delanghe JR, Langlois MR, Wuyts B, De Buyzere ML. Performance of urinary flow cytometry in predicting outcome of urine cultures. J Clin Microbiol 2002; 40:2314-5; author reply 2315. [PMID: 12037122 PMCID: PMC130834 DOI: 10.1128/jcm.40.6.2314-2315.2002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
In humans the iron status is influenced by environmental and genetic factors. Among them, the genetic polymorphism of the hemoglobin (Hb)-binding plasma protein haptoglobin (Hp) has been shown to affect iron turnover. The best known biological function of Hp is capture of free Hb in plasma to allow hepatic recycling of heme iron and to prevent kidney damage during hemolysis. In healthy males, but not in females, the Hp 2-2 phenotype is associated with higher serum iron, higher transferrin saturation, and higher ferritin than Hp 1-1 and 2-1. Moreover, serum ferritin correlates with monocyte L-ferritin content, which is also highest in Hp 2-2 subjects due to endocytosis of multimeric Hb-Hp 2-2 complexes by the recently identified Hb scavenger receptor CD163 in macrophages. This iron delocalization pathway, occurring selectively in Hp 2-2 subjects, has important biological and clinical consequences. The Hp polymorphism is related to the prevalence and the outcome of various pathological conditions with altered iron metabolism such as hemochromatosis, infections, and atherosclerotic vascular disease.
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Delanghe JR, Langlois MR, De Bacquer D, Mak R, Capel P, Van Renterghem L, De Backer G. Discriminative value of serum amyloid A and other acute-phase proteins for coronary heart disease. Atherosclerosis 2002; 160:471-6. [PMID: 11849673 DOI: 10.1016/s0021-9150(01)00607-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We studied the value of serum amyloid A (SAA), a first-class acute-phase protein, as a marker for coronary heart disease (CHD) in a middle-aged male population. In a working population of 16307 men (age, 35-59 years), 446 cases had a history of CHD or prominent Q:QS waves on electrocardiogram. For each case, two matched controls were investigated. SAA, measured by immunonephelometry, was correlated with other acute-phase proteins, cardiovascular risk factors, and infectious serology markers. SAA concentrations were significantly higher in the cases than in controls (P<0.05) and correlated with serum C-reactive protein (CRP) (r=0.61), plasma fibrinogen (r=0.39), serum haptoglobin (r=0.26), and body mass index (r=0.13) (P<0.001). Serum CRP is a better marker for CHD than SAA, which showed discriminative power only in a univariate model comparing highest versus lowest tertile (odds ratio, 1.39; 95% confidence interval, 1.03-1.87). Neither SAA nor other acute-phase proteins correlated with Chlamydia pneumoniae immunoglobulin (Ig)G, Helicobacter pylori IgG and IgA, and cytomegalovirus IgG. In conclusion, although SAA has a discriminative value for CHD, serum CRP is to be preferred as a first-class acute-phase reactant for detection of the disease.
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