Time filter

Source Type

Santa Maria do Suaçuí, Brazil

Giovelli L.L.,Federal University of Santa Maria | Danieli K.,Federal University of Santa Maria | Bortolotto A.N.,Federal University of Santa Maria | Mastella A.K.,Ciencias Farmaceuticas | And 5 more authors.
Jornal Brasileiro de Patologia e Medicina Laboratorial | Year: 2011

Introduction: The sickle cell trait is the presence of hemoglobin S (HbS) in heterozygosity. According to RDC regulation 153/04, abnormal hemoglobin screening has become mandatory in blood donation samples since June 2004. Objective: The aim of this study was to compare different screening methods used in blood banks for HbS detection. Material and method: From April 2007 to April 2008, three HbS detection methods were applied in 4,108 suitable blood samples from the blood bank of the University Hospital of Santa Maria (HUSM). The comparative study among the methods comprised solubility tests and gel-centrifuge (ID-HbS). Furthermore, the positivity reference was the presence of HbS on hemoglobin electrophoresis. Results: Twentythree (0.56%) out of 4,108 samples showed positivity for HbS and two (0.05%) showed positivity for HbC. Twenty-two (95.6%) out of 23 HbS positive samples determined through qualitative electrophoresis were detected by solubility test and 20 (86.9%) were detected by gel-centrifugation test. Conclusion: Hemoglobin electrophoresis proved the best method in the identification of hemoglobin variants and, therefore, worthwhile when it comes to diagnostic screening in blood banks due to its high sensitivity, which keeps false-negative results to a minimum and ensures blood quality.

Goncalves J.F.,Federal University of Rio Grande do Sul | Duarte M.M.M.F.,Campus Universitario Camobi | Fiorenza A.M.,Campus Universitario Camobi | Spanevello R.M.,Campus Universitario Capao do Leao | And 10 more authors.
BioMetals | Year: 2012

The present study aimed to investigate the influence of N-acetylcysteine (NAC) on cadmium (Cd) poisoning by evaluating Cd concentration in tissues, hematological indices as well as the activity of NTPDase, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes of rats exposed to Cd and co-treated with NAC. For this purpose, the rats received Cd (2 mg/kg) and NAC (150 mg/kg) by gavage every other day for 30 days. Animals were divided into four groups (n = 6-8): control/saline, NAC, Cd, and Cd/NAC. Cd exposure increased Cd concentration in plasma, spleen and thymus, and NAC co-treatment modulated this augment in both lymphoid organs. Cd exposure reduced red blood cell count, hemoglobin content and hematocrit value. Cd intoxication caused a decrease in total white blood cell count. NAC treatment per se caused an increase in lymphocyte and a decrease in neutrophil counts. On contrary, Cd exposure caused a decrease in lymphocyte and an increase in neutrophil and monocyte counts. NAC reversed or ameliorated the hematological impairments caused by Cd poisoning. There were no significant alterations in the NTPDase activity in lymphocytes of rats treated with Cd and/or NAC. Cd caused a decrease in the activities of lymphocyte AChE, whole blood AChE and serum BChE. However, NAC co-treatment was inefficient in counteracting the negative effect of Cd in the cholinesterase activities. The present investigation provides ex vivo evidence supporting the hypothesis that Cd induces immunotoxicity by interacting with the lymphoid organs, altering hematological parameters and inhibiting peripheral cholinesterase activity. Also, it highlights the possibility to use NAC as adjuvant against toxicological conditions. Copyright © Springer Science+Business Media, LLC. 2012.

Discover hidden collaborations