Abstract：
OBJECTIVES:Recently it has been suggested that serum beta-N-acetylhexosaminidase (Hex) could be a joint destruction marker in rheumatoid arthritis (RA) patients. However, a large amount of serum Hex activity has its source from platelets, and the blood platelet-count is often increased in RA, which may have masked the significance of the results. The purpose of this study was to investigate the relationship between plasma activity of Hex and disease activity or severity. DESIGN AND METHODS:In 51 patients with RA, with an evolution period for the illness of 10.9 +/- 1.2 yr (range 1-40 yr), we determined the total Hex activity together with its Hex A and B isoenzymes in plasma and in mononuclear (MN) and polymorphonuclear (PMN) leukocytes. RESULTS:The plasma activity of total Hex and Hex B isoenzyme was slightly higher in the group of patients studied (p < 0.01), together with the specific activity of total Hex, Hex A and B in PMN leukocytes (p < 0.001) than in the control group. No significant correlation was found between plasma or leukocyte Hex and the radiologic evaluation of the disease (Sharp's modified method), or the patient's functional capacity (modified Health Assessment Questionnaire). Likewise, a significant correlation between Hex activity and laboratory inflammation markers (C reactive protein, sialic acid, erythrocyte sedimentation rate) or the evolution time of the disease was not found. CONCLUSIONS:The plasma activity of total Hex, or even of its isoenzymes Hex A and Hex B, does not appear to be a reliable marker of erosion and cartilage degradation in RA patients. Liver function appears to be the major determinant for the plasma Hex activity in these patients.
journal_name
Clin Biochemjournal_title
Clinical biochemistryauthors
Casal JA,Mera A,Pérez LF,Tutor JCdoi
10.1016/s0009-9120(02)00339-9subject
Has Abstractpub_date
2002-09-01 00:00:00pages
483-8issue
6eissn
0009-9120issn
1873-2933pii
S0009912002003399journal_volume
35pub_type
杂志文章abstract：:A spectrophotometric study was carried out for three proteins assays when modification of their serum procedures using bromcresol green, bromcresol purple and biuret reagents were applied to the determinations of total proteins and albumin in cerebrospinal fluids. A novel concentration device wherein the sample itself...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(81)90165-x
更新日期：1981-02-01 00:00:00
abstract：:We evaluated two chemical methods for quantifying mannitol in serum, based on the oxidation of mannitol by periodate, and measurement of the formaldehyde formed with chromotropic acid (colorimetry) or acetylacetone (fluorometry). We found interference in these methods by serum glycerol. Additionally, a high-performanc...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(92)90120-h
更新日期：1992-12-01 00:00:00
abstract：:Many clinical laboratories use the Beckman Microzone electrophoretic system (Beckman Instruments Inc. Fullerton, CA 92634) for serum protein separation. Although detailed instruction is supplied in the manufacturer's manual (1) for protein separation, the effect of different sample application positions on the cellulo...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(78)80019-8
更新日期：1978-12-01 00:00:00
abstract：OBJECTIVES:The plasma apolipoprotein B (apo B) concentrations have been considered to be a more accurate representation of atherogenic particles and it has been proposed that the formula LDL-C (mmol/L) = 0.41TC - 0.32TG + 1.70apo B - 0.27 is reliable for the estimation of LDL-C (Clin Chem 1997; 43: 808-15). We undertoo...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(00)00162-4
更新日期：2000-10-01 00:00:00
abstract：BACKGROUND:Currently, 20 IU/L is the accepted sensitivity of over-the-counter (OTC) hCG pregnancy tests, and the only sensitivity permitted for point of care (POC) tests. These sensitivity limitations cause significant numbers of false-negative tests, which mislead women and cause them to avoid precautions needed to av...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2008.09.107
更新日期：2009-02-01 00:00:00
abstract：OBJECTIVES:To investigate the association of parental hyperhomocysteinemia, C677T Methylene tetrahydrofolate reductase (MTHFR) polymorphism and DNA damage with recurrent pregnancy loss (RPL). DESIGN AND METHODS:A case-control study. Reverse phase HPLC, PCR-RFLP and Cytokinesis blocked micronuclei assay were used to as...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2008.12.003
更新日期：2009-03-01 00:00:00
abstract：OBJECTIVES:Does abnormal betaine excretion persist? DESIGN AND METHODS:Patients (10) with abnormal excretion in 1998 were recalled in 2005. Subsequent urine samples were collected on 4 days from persistently abnormal subjects. RESULTS:Half the 1998 abnormal patients were abnormal in 2005. Only 1/20 controls was abnor...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2007.03.009
更新日期：2007-07-01 00:00:00
abstract：:We have modified the procedure for determining total metanephrines in urine described by Gupta, Price and Keane(1) to shorten the time necessary for completion while allowing the technician time to perform other tests. The modification involves the extraction of interfering substances from urine. Instead of having to ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(76)80029-x
更新日期：1976-04-01 00:00:00
abstract：OBJECTIVES:To investigate the possible association between functional variant Ala-9Val in the MnSOD gene and asthma in the case-control study comprising 626 Caucasian subjects. METHODS:MnSOD genotypes were determined by PCR with subsequent restriction analysis by the BsaWI enzyme. RESULTS:Significant differences in a...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2005.12.001
更新日期：2006-03-01 00:00:00
abstract：:1. A relatively inexpensive semi-automated enzymatic procedure is described for the determination of total glycerol with an Auto Analyzer. Free glycerol is determined without saponification in a deproteinized supernatant. 2. The dilution of triglyceride samples during preparation is such that the samples during prepar...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(77)90232-6
更新日期：1977-02-01 00:00:00
abstract：:Plasma, erythrocyte, and leucocyte magnesium (Mg) concentration, as well as urinary Mg, calcium (Ca), and phosphorus (P) excretion were determined in male subjects with elevated diastolic blood pressure (DBP) > 90 mmHg. These parameters were compared to those in normotensive age-matched (DBP < 85 mmHg) and drug-treate...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(93)90027-4
更新日期：1993-06-01 00:00:00
abstract：INTRODUCTION:Vitamin B12 deficiency is mostly caused by insufficient gastro-intestinal absorption and in rare conditions by Transcobalamin (TC) deficiency. Unsaturated Transcobalamin (apoTC) can be measured by a binding assay using radiolabeled cobalamin. The Active B12 test analyzes saturated Transcobalamin (holoTC) a...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2017.08.009
更新日期：2017-12-01 00:00:00
abstract：OBJECTIVES:The aim of this study was to determine whether the atherogenic index of plasma (AIP=log[triglycerides/HDL-cholesterol]) differs in heterozygous familial hypercholesterolemia (FH) patients with and without a history of cardiovascular disease (CVD). DESIGN AND METHODS:A total of 555 FH patients with known mut...
journal_title：Clinical biochemistry
pub_type： 杂志文章,多中心研究
doi：10.1016/j.clinbiochem.2011.11.001
更新日期：2012-01-01 00:00:00
abstract：:57Co-cyanocobalamin is substituted for iodine labeled antigen in three commercially available solid phase radioimmunoassay kits to evaluate the extent of non-specific binding by determination of the supernatant and residual fraction of unbound ligand and thus obtain a value for corrected binding throughout the range o...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(78)90070-x
更新日期：1978-06-01 00:00:00
abstract：INTRODUCTION:It has been suggested that ghrelin may play a role in growth hormone (GH) secretion to exercise. OBJECTIVE:The present study was designed to examine the effects of a single bout of circuit resistance exercise on plasma glucose, ghrelin, GH, and c-peptide, and cortisol. DESIGN AND METHODS:Fourteen volunte...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.05.009
更新日期：2006-10-01 00:00:00
abstract：OBJECTIVES:Although monitoring of cyclosporin (CsA) is standard clinical practice postrenal transplantation, mycophenolic acid (MPA) concentrations are not routinely measured. There is evidence that a relationship exists between MPA area under the concentration-time curve (AUC) and rejection. In this study, a retrospec...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(00)00196-x
更新日期：2001-02-01 00:00:00
abstract：OBJECTIVE:We seek to identify the differentially expressed miRNAs in the clear cell subtype (ccRCC) of kidney cancer. DESIGN AND METHODS:We performed a miRNA microarray analysis to compare the miRNA expression levels between ccRCC tissues and their normal counterpart. The top dysregulated miRNAs were validated by quan...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2009.07.020
更新日期：2010-01-01 00:00:00
abstract：OBJECTIVES:Therapeutic monitoring of everolimus with chromatographic methods (HPLC) enabled effective immunosuppression while limiting the incidence of drug-related adverse events. A fluorescence polarization immunoassay (FPIA) has been recently developed for the assessment of everolimus levels. The present study was d...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.08.013
更新日期：2006-12-01 00:00:00
abstract：OBJECTIVES:The use of iodinated contrast media has grown in popularity in the past two decades, but relatively little attention has been paid to the possible interferential effects of contrast media on laboratory test results. Herein, we investigate medical contrast media interference with routine chemistry results obt...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2017.02.023
更新日期：2017-08-01 00:00:00
abstract：OBJECTIVE:Neonatal abstinence syndrome (NAS) is a rising concern with unknown long-term effects. It is apparent that higher cost of care, impact on the community and reduced quality of life are associated with similar etiologies (e.g., fetal alcohol syndrome). Detection of drug exposure in utero allows for earlier inte...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2017.09.016
更新日期：2017-12-01 00:00:00
abstract：OBJECTIVES:To develop a method for the determination of succinylacetone (SA) in dried blood spots (DBS) using tandem mass spectrometry (MS/MS). METHODS:SA was extracted from DBS with an acetonitrile and water solution (80:20 by volume) containing formic acid and hydrazine hydrate (both at 0.1% by volume), and analyzed...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2004.07.006
更新日期：2004-11-01 00:00:00
abstract：OBJECTIVES:Anti-Müllerian hormone (AMH) measurement is useful as an aid in the evaluation of ovarian reserve. In the past, its conventional use was restricted by the low-throughput and variability of existing manual AMH assays. We developed the automated Access AMH assay for the quantitative determination of AMH levels...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2016.08.005
更新日期：2016-11-01 00:00:00
abstract：:Retrospective analysis of DNA from paraffin-embedded fixed bone marrow biopsy specimens is possible if preceded by amplification of the DNA sequences of interest by the polymerase chain reaction (PCR). These fixed specimens yield degraded DNA that may not be suitable for direct analysis by conventional digestion and h...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(92)80051-h
更新日期：1992-04-01 00:00:00
abstract：BACKGROUND:Increased levels of circulating endostatin predicts cardiovascular morbidity and impaired kidney function in the general population. The utility of endostatin as a risk marker for mortality in the emergency department (ED) has not been reported. AIM:Our main aim was to study the association between plasma e...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2019.10.004
更新日期：2020-01-01 00:00:00
abstract：BACKGROUND:Vitamin B12 insufficiency/deficiency is common in mixed patient populations. However there is no single marker which can reliably diagnose B12 insufficiency/deficiency. Elevated concentrations of methylmalonic acid (MMA) are considered the most representative marker of metabolic vitamin B12 insufficiency, bu...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2013.08.006
更新日期：2014-01-01 00:00:00
abstract：OBJECTIVES:Investigate the interference of Virox® disinfectant wipes containing hydrogen peroxide with Lifescan SureStep Flexx® glucose meter results. DESIGN AND METHODS:Glucose measurements of control and whole blood samples were performed before and after cleaning with Virox® wipes to reveal the kinetics of this int...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2010.09.012
更新日期：2010-12-01 00:00:00
abstract：OBJECTIVES:This study examines the redox status of drug-resistant epileptic patients and how it is modified after surgical treatment. DESIGN AND METHODS:The activity of antioxidant enzymes (superoxide dismutase, catalase and glutathione peroxidase), and markers of damage to biomolecules (malondialdehyde and advanced o...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.11.019
更新日期：2007-03-01 00:00:00
abstract：:The ES 300 system, a fully automated multichannel immunoassay analyzer, was evaluated simultaneously for 9 weeks in four major centers. Precision, accuracy, carryover, comparison to in-house methods, and interferences were assessed for the following 17 tests: T4, T3, FT4, TSH, TBK, TBG, LH, FSH, prolactin, HCG, digoxi...
journal_title：Clinical biochemistry
pub_type： 杂志文章,多中心研究
doi：10.1016/0009-9120(93)90017-z
更新日期：1993-02-01 00:00:00
abstract：:Our studies lead us to suggest that in order for an organic chemical to cause porphyrin accumulation in chick embryo hepatocyte culture, it must be: 1. lipophilic; 2. resistant to biotransformation by phase I or phase II reactions to compounds which are devoid of biological activity; and 3. capable of interacting with...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(89)80073-6
更新日期：1989-06-01 00:00:00
abstract：OBJECTIVE:To establish a ELISA assay to measure release of type 1-phospholipase A2 propeptide from activated granulocytes. Human type 1-prophospholipase A2 (1-proPLA2) is biosynthesized and stored as inactive zymogen. Activation involves tryptic-like cleavage at the N-terminus, with equimolar release of the heptapeptid...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(94)00068-7
更新日期：1995-02-01 00:00:00
