Acetaminophen-induced rhabdomyolysis.
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Acetaminophen↗
Biomedical subjects
J C Humbert
Publications and source records attributed to J C Humbert.
Bone marrow transplantation as treatment for X-linked immunodeficiency with hyper-IgM.
We report a 10-year-old boy with a severe form of immunodeficiency with hyper-IgM who underwent successful bone marrow transplantation with his HLA-matched sister as donor. Busulfan (20 mg/kg) and cyclophosphamide (200 mg/kg) were used as conditioning. The post-transplant course was uneventful. He is alive 25 months later with full hematological and immunological reconstitution.
B-Lymphocytes↗
De novo methylation of tumour suppressor genes CDKN2A and CDKN2B is a rare finding in B-cell chronic lymphocytic leukaemia.
De novo methylation of the 5'CpG island has been recently reported as an alternative mechanism of inactivation for the tumour suppressor genes CDKN2A and CDKN2B. We examined CDKN2A methylation status at diagnosis in 42 B-cell chronic lymphocytic leukaemia (CLL) patients, in 19 cases the CDKN2B methylation status was also analysed. No homozygous CDKN2A/2B deletion was detected, but four patients (9%) displayed an aberrant CDKN2A methylation status and only one had hypermethylated CDKN2B. De novo methylation was associated with silencing of gene expression. These results confirm that CDKN2A/2B inactivation by deletion is a rare event in CLL and suggest that aberrant methylation could be an alternative way of inactivation very rarely involved in the development of some CLL.
Blotting, Southern↗
[Effect of cholesterol on the cellular deformability and osmotic fragility of erythrocytes].
The effect of cholesterol hemisuccinate incorporation on the rheological properties of the erythrocyte membrane was assessed by measuring deformability (elongation index) and osmotic fragility ("baseline hemolysis"). These two experimental methods have different response sensitivities according to the incubation protocols (12 h 25 degrees C/12 h 25 degrees C then 12 h 37 degrees C) ant to the amount of cholesterol incorporated in the membrane (C/Pt from 0.18 to 0.83). The deformability and osmotic fragility variations observed are inversely related with the cholesterol concentrations incorporated. The experimental differences observed in the deformability and osmotic fragility are discussed in view of the type of membrane deformation and of the signals collected by the two systems.
Case-Control Studies↗
Reticulocytes: reference limits.
Healthy reference ranges for the total peripheral reticulocyte count and its three subpopulations, LFR (low fluorescence ratio), MFR (middle fluorescence ratio) and HFR (high fluorescence ratio) were established on 1219 healthy subjects. Samples were taken from subjects of both sexes with ages ranging from 4 to over 60 years. The observed ranges were found to be different between males and females for the group over 20 years old, while there was no difference between sexes found at the age between 4 and 19 years.
Adolescent↗
Refractory anemia with excess of blasts: a multivariate analysis of prognostic factors in 91 patients and a simplified scoring system for predicting survival.
Prognosis in myelodysplastic syndromes is extremely variable. The prognostic value of the FAB classification has been demonstrated in many studies. However, within the same FAB subtype, some patients may experience prolonged survival, whereas others die in a few weeks. This prognostic heterogeneity makes the therapy decision difficult. In an attempt to identify significant prognostic factors for survival in refractory anemia with excess of blasts (RAEB), clinical and hematological characteristics were analyzed in 91 patients. Multivariate regression analysis showed that bone marrow total blast cells percentages, sex and hemoglobin level were the characteristics significantly associated with survival. A scoring index based upon these three characteristics may be proposed and had a great prognostic value (p < 0.00001). It allows us to separate patients into three groups with low, intermediate and high score with a median survival of 239, 133 and 45 days for each group respectively. This scoring index may be useful in the design of therapy and analysis of future clinical trials. However, its predictive value needs to be confirmed in other series.
Adult↗
The number of circulating CD34 positive cells is the best preleukapheresis parameter for predicting the quality of peripheral blood progenitor cell harvest.
Correlations between different peripheral blood parameters and harvesting yields of stem cells were analysed in 230 leukaphereses performed on 61 patients. According to multivariate analysis, the number of circulating CD34 positive cells was found to provide the best preleukapheresis parameter for predicting the quality of peripheral blood progenitor cell harvest. A high correlation coefficient and small 95% confidence and prediction intervals would indicate the assay of CD34 positive cells in peripheral blood to be a unique tool essential for monitoring the collection of circulating haematopoietic progenitors.
Adolescent↗
Comparative evaluation of S9788, verapamil, and cyclosporine A in K562 human leukemia cell lines and in P-glycoprotein-expressing samples from patients with hematologic malignancies.
The activity of S9788, recently synthetized as a modulator of multidrug resistance (MDR), was compared with verapamil and cyclosporine A in normal sensitive and MDR K562 cell lines, then in samples from 33 patients with hematological malignancies, using flow cytometry with simultaneous detection of P-glycoprotein and determination of intracellular daunorubicin fluorescence. This technique was compared and correlated with a tritiated daunorubicin accumulation method. In K562 cell lines, S9788 exhibited a significantly higher reversing activity than verapamil and cyclosporine A, and allowed a complete restoration of the accumulation of daunorubicin when used at 5 mumol/L. In the clinical samples, the three compounds were evaluated at equimolar concentration (5 mumol/L) using concomitant exposure to daunorubicin and to the reversing agent. In P-glycoprotein-negative samples, no significant effect on intracellular daunorubicin fluorescence of any of the reversing agents was noted. In the 15 P-glycoprotein-positive samples, a significant increase in daunorubicin fluorescence, by at least one reversing agent, was seen in 10 cases, among which S9788 reversing activity was higher than that of the two other agents in seven cases. Complete reversal was only achieved in one case with S9788.
ATP Binding Cassette Transporter, Subfamily B, Mem↗
Reticulocytes: biological variations and reference limits.
The reticulocyte count is a good index of erythropoietic activity. Automated methods, mainly flow cytometry, have made the counting easier, more accurate and reproducible. The data presented describe the counting of reticulocytes in 1219 apparently healthy subjects of both sexes who came for a periodic health examination. Their ages varied from 4 to over 60 years. The reticulocytes were counted with a flow cytometer (Sysmex R-3000) with Auramine-O as fluorochrome. There was no statistical difference between boys and girls aged 4-19 years. However, the reticulocyte count was significantly higher in men than in women over 20 years of age. The reticulocyte count was affected neither by the menstrual cycle in girls at puberty, nor by oral contraceptives and the menopause in women. No effect of moderate smoking was observed in either sex. Reference limits of the reticulocyte counts (percentage and absolute value) according to age and sex and the three types of reticulocytes are provided.
Adolescent↗
Interleukin-6, interferon-gamma, and phospholipid levels in the alveolar lining fluid of human lungs. Profiles in coal worker's pneumoconiosis and idiopathic pulmonary fibrosis.
Cytokines are widely involved in physiologic as well as immunoinflammatory and fibrosing processes of the lung. The aim of this work was to study, by bronchoalveolar lavage, two groups of human interstitial lung diseases (ILD) with fibrosing propensity (ie, idiopathic pulmonary fibrosis [IPF], n = 10; and coal worker's pneumoconiosis [CWP], n = 15). Patients were compared with nonsmoker control subjects (n = 20). Cellularity, proteins, and phospholipids were determined in the alveolar fluids. In addition, two cytokines (interleukin-6 [IL-6] and interferon-gamma [IFN-gamma]), which are presumed to possess respective antifibrotic and profibrotic activities, were measured in the respiratory tract. Compared with control subjects, IPF and simple CWP showed alveolar hypercellularity (p < 0.05) and relative lymphocytosis (p < 0.05). Both exhibited increased alveolar permeability (ie, increased albumin/urea ratio, p < 0.05), with enhanced IL-6 and decreased IFN-gamma in the alveolar spaces (p < 0.05). On the other hand, IPF displayed an associated polymorphonuclear alveolitis, enhanced alveolar epithelial lining fluid (AELF) volume and low surfactant phospholipid levels (p < 0.05 vs control), whereas simple CWP shared an exclusive lymphocytosis, normal AELF volume, and a surfactant lipid overflow (p < 0.05 vs control). Relationships among all of these parameters were found only between alveolar cellularity, neutrophils and IL-6 levels in the AELF of IPF (respectively, r = 0.85, p = 0.0009, and r = 0.89, p = 0.0006). In summary, common alterations of cellular and cytokine turnover were observed in IPF and simple CWP and may reflect activity of the antifibrotic fight in these diseased lungs. Surfactant phospholipid levels are likely to represent a specific disturbance among IPF and CWP, but no clear relationship with respect to the other parameters could be established for explaining the difference in time course outcome.
Adult↗
Influence of heparin on the chemotactic activity of human thrombin.
Chemoattractant properties of human thrombin have been studied, by polymorphonuclear leucocyte migration under agarose gel, in the presence of various sulphated macromolecules such as standard heparins, low molecular weight heparins, CY216, K2165, PK10169 and pentosane polysulphate. These compounds did not attract polymorphonuclear leucocytes within the range of concentrations used, whilst thrombin alone is a cytotaxin for these cells. Addition of heparins to thrombin led to an increase in the chemoattractant activity of this enzyme for at least one of the doses studied. Augmentation of the chemoattractant activity of thrombin by heparins was shown at concentrations equivalent to those found in-vivo after administration of therapeutic doses of heparin. Pentosane polysulphate, at the studied concentrations, did not lead to a significant rise in the chemoattractant activity of thrombin.
Chemotaxis, Leukocyte↗
[Serum antibodies against hepatitis C: study of 4,100 blood donors from the northeast of France].
Between June 1989 and February 1990 the prevalence of antibodies to hepatitis C virus (anti-HCV) was studied in blood donations from 4,100 donors tested in north east France. 37 samples were found reactive for anti-HCV (prevalence of anti-HCV: 0.90%) without any significant difference in sex (males: 0.94%; females: 0.87%) and age distributions. 178 (4.34%) of the 4,100 donors were found anti-HBc positive, 5 of these donors being anti-HCV positive (13.51% of all anti-HCV positive donors). 52 donors (1.27%) had raised alanine aminotransferase (ALT) levels (greater than or equal to 2 N: 2 times the M +/- 2 SD value): 3 were found anti-HCV positive (8.11% of all anti-HCV positive donors). Association of the 2 surrogate markers is poorly sensitive since it detects only 8 (21.62%; males: 4, females: 4) of all anti-HCV positive donors. Furthermore, it appears weekly specific since it discards 230 blood samples of which 222 (96.52%) were anti-HCV negative. The 2 surrogate markers are complementary to one another and none of the anti-HCV positive donors had both anti-HBc antibodies and raised ALT. The mean ALT level is significantly higher in anti-HCV positive donors as compared to seronegative (M +/- 1 SD: 51 +/- 82 U/l versus 24 +/- 17 U/l). In anti-HCV positive donors, a marginal (r = 0.34) though statistically significant (p less than 0.05) positive correlation was found between ALT level and anti-HCV ratio.(ABSTRACT TRUNCATED AT 250 WORDS)
Alanine Transaminase↗
Analysis of blood CD4+ and CD8+ T-lymphocyte subsets with monoclonal antibodies. Comparison of the Genetic Systems CD4/CD antigen typing kit with conventional indirect immunofluorescence microscopy and the automated Technicon-H1 Enzyme Immunoassay (EIA).
The Genetic Systems Technique (GS: direct immunofluorescence microscopy with ethidium bromide counterstaining of nuclei) was tested for quantitative analysis of T-lymphocyte subsets in human peripheral blood. The monoclonal antibodies anti-CD4 and anti-CD8 were used for detection of T-helper and T-suppressor cells respectively and the results compared to those obtained by conventional indirect immunofluorescence microscopy and the Technicon Enzyme Immunoassay (EIA) with automated reading. The GS technique provided results correlating well with both indirect immunofluorescence and EIA techniques. Moreover, this method has two advantages: it is less time-consuming than the indirect immunofluorescence microscopy and necessitates less expensive and more commonly available equipment than the automated EIA technique.
Antibodies, Monoclonal↗
Effects of indomethacin and diclofenac on some functions of polymorphonuclear neutrophils.
The effects in-vitro of two non-steroidal anti-inflammatory drugs, diclofenac and indomethacin, have been studied on human polymorphonuclear functions. Adhesivity and chemotaxis were decreased by the two drugs, but in a manner that varied with the attractant used. As shown by the nitro blue tetrazolium slide test, all cells remained active but the production of oxygen metabolites by opsonized zymosan was decreased in the presence of diclofenac.
Cell Adhesion↗
Haematological and hormonal responses to dynamic exercise in patients with chronic airway obstruction.
The influence of exercise on hormonal and total white blood cells (WBC), lymphocytes (L). Granulocytes (GR), and platelet (P) count responses was studied in: twenty-five patients with chronic airway obstruction (CAO, 47 +/- 1.8 years, mean +/- SEM) and thirteen normal subjects (N, 36 +/- 2.6 years). They performed a submaximal (40 W) and a maximal exercise (VO2max). Arterial blood samples were taken at rest, 40 W, and VO2max. [H+], PaCO2, PaO2 haematocrit (Hct), [Hb], P, total platelet volume (TPV), WBC, GR, L, and total red blood cells (RBC) were measured. At rest, WBC, GR, P and TPV were higher in CAO patients, whilst PaO2 and cortisol were lower. At 40 W, when compared to values obtained at rest, WBC, GR, L, P and TPV were increased in both groups; WBC, GR, P and TPV were higher in CAO patients. VO2max of CAO patients represented 54% of that of controls. At VO2max, Hct, [Hb] and RBC were approximately 10% higher than at rest in both groups, whilst changes were more significant in normals for WBC (CAO = 55%, N = 76%), lymphocytes (CAO = 83%, N = 105%), GR, (CAO = 37%; N = 51%), platelets (CAO = 23%, N = 29%), TPV (CAO = 25.4%, N = 35%), [H+] (CAO = 43%, N = 38%) and ACTH (CAO = 82%, N = 139%). PaO2 and cortisol did not differ between groups. PaCO2 and platelets however, were higher in the CAO group.(ABSTRACT TRUNCATED AT 250 WORDS)
Adrenocorticotropic Hormone↗
Training and leucocyte, lymphocyte and platelet response to dynamic exercise.
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Adrenocorticotropic Hormone↗
Leukocyte, lymphocyte and platelet response to dynamic exercise. Duration or intensity effect?
The influence of work intensity and duration on the white blood cell (WBC), lymphocyte (L) and platelet (P) count response to exercise was studied in 16 trained subjects (22 +/- 5.4 years, means +/- SD). They performed three cyclo-ergospirometric protocols: A) 10 min at 150 W followed by a progressive test (30 W/3 min) till exhaustion; B) constant maximal work (VO2max); C) a 45 min Square-Wave Endurance Exercise Test (SWEET), (n = 5). Arterial blood samples were taken: at rest, submaximal and maximal exercise in A; maximal exercise in B; 15th, 30th and 45th min in the SWEET. Lactate, [H+], PaCO2, PaO2, [Hct], Hb, cortisol, ACTH, total platelet volume (TPV), total blood red cell (RBC), WBC, L and P were measured. At 150 W, WBC, L, P, and TPV increased. VO2max did not differ between A and B, but a difference was found in total exercise time (A = 25 +/- 3 min; B = 7 +/- 2 min, p less than 0.001). In A, at VO2max, the increase was very small for Hct, [Hb], and RBC (10%), in contrast with large changes for WBC (+93%), L (+137%), P (+32%), TPV (+35%), [H+] (+39%), lactate (+715%), and ACTH (+95%). At VO2max there were no differences in these variables between A and B. During the SWEET: WBC, L, P, TPV and ACTH increased at the 15th min as much as in VO2max, but no difference was observed between the 15th, 30th and 45th min, except for ACTH which continued to rise; the lactate increase during the SWEET was about half (+341%) the value observed at VO2max, and [H+] did not vary with respect to values at rest.(ABSTRACT TRUNCATED AT 250 WORDS)
Adolescent↗
[Evaluation of the Coulter Counter S+IV LMG: estimation of the leukocyte formula. Comparison with microscopic methods].
The evaluation of a differential count instrument of the Coulter S+line, the S+IV LMG Coulter-Counter, in particular for the lymphocyte, monocyte and granulocyte count was carried out. This differential analysis was compared with more classical methods of the manual (microscope) or automatic type (image analyser, Hematrack 360 type, Geometric Data). The repeatability is very good and the correlations excellent. The instrument can even detect the presence of low percentages of abnormal cells. Placement of reagents and samples at room temperature is important and the samples can be kept at room temperature for at least 9 hours without disturbing the count. In addition, energetic shaking of the samples does not change the count for the three types of cells. Due to the alarms given by the instrument as regards the cell distributions and all of the parameters of the blood cell count, no pathology should be ignored. In their laboratory, the authors note that about 25% of the smears are further examined by microscope.
Autoanalysis↗