Schoppet M.,University of Marburg |
Hofbauer L.C.,TU Dresden |
Brinskelle-Schmal N.,Biomarker Design Forschung GmbH |
Varennes A.,Central Biochemical Laboratory |
And 5 more authors.
Journal of Clinical Endocrinology and Metabolism | Year: 2012
Context: Calcification inhibitor deficiencies, mineral imbalance, and phenotypic transformation of vascular cells to osteogenic cells initiate and sustain vascular calcification. Fibroblast growth factor- 23 (FGF23) is a key molecule regulating mineral homeostasis. Objective: Our objective was to assess the association of serum FGF23 levels with mineral metabolism parameters and abdominal aortic calcification (AAC) in men. Design: This was a cross-sectional analysis in the STRAMBO cohort. Setting: Men holding a private health insurance cover with Mutuelle de Travailleurs de la Région Lyonnaise were included in the study. Participants: Participants included male volunteers aged 20-87 (n = 1130). Interventions: Nonfasting blood collection was done. AAC was semiquantitatively assessed from vertebral fracture assessment scans obtained using dual-energy x-ray absorptiometry. Main Outcome Measures: We evaluated the association between FGF23 concentration and AAC severity in men. Results: In 350 men aged 60 yr or younger, FGF23 levels decreased with age (r = -0.21; P < 0.001) but were not associated with any other parameter. In 780 men aged over 60 yr, serum FGF23 correlated with age (r = 0.37; P < 0.001) and, after adjustment for confounders, with glomerular filtration rate (r = -0.31; P < 0.001) and PTH levels (r = 0.25; P < 0.001). After adjustment for confounders, self-reported ischemic heart disease, diabetes mellitus as well as higher concentrations of C-reactive protein and osteoprotegerin were all associated with higher FGF23 levels. After adjustment for confounders, subjects in the highest FGF23 quartile had higher prevalence of severe AAC compared with the three lower quartiles combined (odds ratio = 1.88; 95% confidence interval = 1.22-2.85; P < 0.005). Conclusions: In healthy older men, circulating FGF23 is associated with parameters of mineral metabolism, including bone metabolism-regulating cytokines, and with severe AAC independent of traditional risk factors. Copyright © 2012 by The Endocrine Society.
Mendes M.E.,University of Sao Paulo |
Fagundes C.C.,BioMedica |
Do Porto C.C.,Servico de Bioquimica Clinica |
Bento L.C.,BioMedica |
And 3 more authors.
Jornal Brasileiro de Patologia e Medicina Laboratorial | Year: 2011
Water is a reagent used in most laboratory tests and, therefore, must follow stringent quality control standards. The urban water supply has organic molecules, inorganic ions, particles, colloids, gases, bacteria and their products, which may alter laboratory test results and cause occasional errors and mechanical failures in diagnostic equipment. To remove these impurities, it is necessary to use a combination of purification technologies. There are several organizations that specify reagent water standards to minimize its interference in laboratory assays. Most laboratories set standards established by the Clinical and Laboratory Standards Institute (CLSI), which classifies the type of water as follows: clinical laboratory reagent water (CLRW), special reagent water (SRW) and instrumental feed water (IFW). The quality monitoring is performed by means of assessing the resistivity, conductivity, total organic carbon (TOC), microbial control and endotoxins. The parameters are evaluated in accordance with the frequency determined by the standard used. In this article we discuss the importance of water employed in laboratory procedures, its quality control and its interference in laboratory assays.
Szulc P.,University of Lyon |
Hawa G.,BioMedica |
Boutroy S.,University of Lyon |
Vilayphiou N.,University of Lyon |
And 4 more authors.
Journal of Clinical Endocrinology and Metabolism | Year: 2011
Context: Osteoprotegerin (OPG) is an inhibitor of bone resorption, but its relationship to bone microarchitecture remains unclear. Objective: Our objective was to study the relationship between OPG concentration and bone microarchitecture in men. Design, Setting, and Participants: We conducted a cross-sectional study of a population-based cohort of 1149 men aged 20-87 yr. Interventions: We assessed bone microarchitecture at the distal radius and tibia by high-resolution peripheral quantitative computed tomography (XtremeCT Scanco) and measured serum OPG concentration and bone turnover markers: osteocalcin, bone-specific alkaline phosphatase, N-terminal extension type I collagen propeptide, C-terminal type 1 collagen telopeptide, and urinary deoxypyridinoline. Main outcome measures: Differences were assessed in bone microarchitectural parameters across the OPG quartiles in the models adjusted for age, weight, height, physical activity, ischemic heart disease, diabetes mellitus, calcium intake, serum levels of free testosterone, bioavailable 17β-estradiol, PTH, 25-hydroxycholecalciferol, and creatinine. Results: After adjustment for the confounders, men in the highest (fourth) quartile of OPG levels (>4.55pmol/liter)hadhighertotal cross- sectionalareaandtrabecularareaatthedistalradiusanddistal tibia (3.3-6.0%, P < 0.05). At both skeletal sites, the highest OPG quartile was associated with lower cortical thickness (8.2%, P < 0.001, and 3.7%, P < 0.05) and volumetric bone mineral density (vBMD, 2.7%, P < 0.001, and 1.6%, P < 0.005) compared with the three lower quartiles combined. Associations of OPG level with trabecular vBMD, number, thickness, and distribution were not significant. Men in the fourth OPG quartile had higher levels of bone resorption markers (11.8-13.1%, P < 0.01-0.001). Conclusions: Men with higher serum OPG concentration had lower cortical thickness and vBMD, probably due to accelerated endo- and intracortical bone turnover, but higher cross-sectional area possibly due to periosteal apposition. Copyright © 2011 by The Endocrine Society.
Schons C.D.,BioMedica |
Tavares R.G.,Federal University of Health Sciences, Porto Alegre
Jornal Brasileiro de Patologia e Medicina Laboratorial | Year: 2010
Introduction: The reliability of laboratory results is ensured by the implementation of quality control, which has basic functions, such as analysis, research and prevention of laboratory errors through programs that encompass both internal and external control. Objective: To propose a standard method to use pooled whole blood as internal quality control in the Hematology division. Method: The selected whole blood samples were collected with EDTA, belonged to the same blood group and Rh factor and did not present interfering factors, such as hemolysis, lipemia and icterus. From a total of 30 ml of whole blood it was obtained 3 aliquots of 10 ml each, to which 0 ml (no addition), 1 ml and 5 ml of glycerol (preservative) were added, respectively. The samples were analyzed in the automatic counter ADVIA® 60. After the determination of mean and standard deviation values of all samples, they were evaluated for a period of 45 working days in order to produce a Levey-Jennings graph and to check their stability. Result and conclusion: We could verify that the pool of whole blood prepared in accordance with the methodology proposed does not present the required stability to be used as an alternative internal control in the Hematology division.
Intracitoplasmic morphologically selected sperm injection (IMSI) and its impact on fertilization rates, cleavage and embryo quality [Injeção intracitoplasmática de espermatozóides morfologicamente selecionados (IMSI) e seu impacto nas taxas de fertilização, clivagem e qualidade embrionárias]
Tarasconi A.C.,University Of Passo Fundo |
Silva E.V.,Biologa. Genesis Clinica de Reproducao Humana |
Tarasconi B.V.,University Of Passo Fundo |
Verzeletti F.,BioMedica |
Tarasconi D.V.,University Of Passo Fundo
Jornal Brasileiro de Reproducao Assistida | Year: 2010
Objective: To develop a comparative study among intracytoplasmic morphologically selected sperm injection (IMSI) and conventional intracytoplasmic sperm injection (ICSI), assessing the efficacy of both in fertilization rates, cleavage and embryo quality. Methods: 36 cycles of intracytoplasmic sperm injection have been analyzed. In these cycles were obtained 603 mature oocytes (MII), which were injected with sperm selected by two different techniques. The oocytes obtained of each patient were divided into two groups (A and B). In group A (302 oocytes), were employed, to assess the morphology of sperm to be injected, the conventional equipment that provides optic magnification of 400 X (conventional ICSI). In group B (301 oocytes), were employed an equipment that provides an optic magnification of 6800X, (IMSI). After embryo culture was performed, fertilization rates, cleavage and embryo quality until day 3, on each group, were analyzed. Results: The total fertilization rate in group A was 78,81%, and in group B, 81,06%. The cleavage rate in group A was 97,29%, and in group B, 96,41%. The percentage of good quality embryos (grade I e II), in day 2, in group A was 79,53% and in group B, 78,13%. The percentage of good quality embryos on day 3, in group A was 77,41% and in group B 78,81%. Conclusion: There were no significant difference in fertilization rates, cleavage and embryo quality to day 3, comparing these two methods of sperm selection. Copyright - Todos os direitos reservados a SBRA - Sociedade Brasileira de Reprodução Assistida.