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Rocha MM, Matos RRC, Figueiredo AF, Melgaço AH, Horn PR, Marques-Salles TJ, Binato R, Silva MLM, Abdelhay E, Ferreira GM. MOLECULAR CYTOGENETIC AND NEXT-GENERATION SEQUENCING STUDIES OF AN ADOLESCENT WITH ACUTE MYELOID LEUKEMIA AND INV(16) ASSOCIATED WITH A KIT PATHOGENIC MUTATION. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Rocha MM, Matos RRC, Figueiredo AF, Melgaço AH, Lima LB, Marques-Salles TJ, Liehr T, Abdelhay E, Ferreira GM, Silva MLM. FLEXIBILITY OF FISH PROBES IN MONITORING IAMP21 ACUTE LYMPHOBLASTIC LEUKEMIA: STUDY OF FOUR BRAZILIAN CHILDREN. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Matos RRC, Ferreira GM, Costa ES, Mello FV, Melgaço AH, Rouxinol M, Land MG, Ribeiro RC, Zalcberg I, Silva MLM. CLINICAL AND MOLECULAR REPORT OF A RARE RAM POSITIVE NON-DOWN SYNDROME INFANT CBFA2T3-GLIS2 NEGATIVE, PRESENTING THE DRIVER P210-BCR-ABL1. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Ferreira GM, Annandale CH, Smuts MP, Holm DE. The potential effects and interactions of oxidative stress and trace minerals on fresh and frozen semen in bulls – a review. J S Afr Vet Assoc 2022; 93:70-75. [DOI: 10.36303/jsava.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023] Open
Affiliation(s)
- GM Ferreira
- Morvet, Potchefstroom,
South Africa
- Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria,
South Africa
| | - CH Annandale
- School of Veterinary Medicine, College of Science, Health, Engineering and Education, Murdoch University,
Australia
| | - MP Smuts
- Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria,
South Africa
| | - DE Holm
- Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria,
South Africa
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Capela de Matos RR, Othman M, Ferreira GM, Monteso K, de Souza MT, Rouxinol M, Melo JB, Carreira IM, Abdelhay E, Liehr T, Ribeiro RC, Silva M. Somatic homozygous loss of SH2B3, and a non-Robertsonian translocation t(15;21)(q25.3;q22.1) with NTRK3 rearrangement, in an adolescent with progenitor B-cell acute lymphoblastic leukemia with the iAMP21. Cancer Genet 2021; 262-263:16-22. [PMID: 34974289 DOI: 10.1016/j.cancergen.2021.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 11/04/2021] [Accepted: 12/20/2021] [Indexed: 11/18/2022]
Abstract
Intrachromosomal amplification of chromosome 21 (iAMP21) occurs in ∼2% of B-cell acute lymphoblastic leukemia (ALL) and is considered to confer a poor prognosis. The relapse risk is associated with therapy intensity, suggesting that other somatic mutations may influence iAMP21-ALL prognosis. This abnormality is characterized by multiple copies of the RUNX1 gene in chromosome 21 and appears to arise through multiple breakage-fusion bridge cycles and chromothripsis. Rob(15;21) or a ring chromosome 21 have been associated with an increased risk for iAMP21-ALL, suggesting that constitutional genetic abnormalities may also drive leukemogenesis. Here we describe homozygous deletion of the SH2B3 gene, chromothripsis of chromosome 21, and a non-Robertsonian somatic t(15;21)(q25.3;q22.1) with NTRK3 gene rearrangement in an adolescent with iAMP21-B-ALL. Molecular cytogenetic studies detected iAMP21 with aCGH analysis revealing further genomic imbalances. The RT-qPCR analysis detected elevated expression levels of RUNX1 (68-fold) and reduced expression of CDK6 (0.057-fold). Studies with constitutive cells collected from mouth swabs showed that SH2B3 biallelic deletion was a somatic alteration occurring during clonal evolution. The identification of novel secondary genetic changes was valuable to discuss sporadic iAMP21 leukemogenic mechanisms. For the first time, we show a t(15;21)(q25.3;q22.1) with NTRK3 rearrangement in an adolescent with iAMP21-ALL.
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Affiliation(s)
- R R Capela de Matos
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - Mak Othman
- Jena University Hospital, Institute of Human Genetics, Jena, Germany
| | - G M Ferreira
- Stem Cells Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - Kca Monteso
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - M T de Souza
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - M Rouxinol
- Lagoa Federal Hospital, Rio de Janeiro, Brazil
| | - J B Melo
- Cytogenetics and Genomics Laboratory, Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Centre of Investigation on Environment Genetics and Oncobiology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - I M Carreira
- Cytogenetics and Genomics Laboratory, Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Centre of Investigation on Environment Genetics and Oncobiology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - E Abdelhay
- Stem Cells Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - T Liehr
- Jena University Hospital, Institute of Human Genetics, Jena, Germany
| | - R C Ribeiro
- Departments of Oncology and Global Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Mlm Silva
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil.
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Matos RRC, Ferreira GM, Monteso KC, Bizarro MT, Othman M, Liehr T, Rouxinol M, Abdelhay E, Binato R, Silva MLM. NTRK3 REARRANGEMENT IN A NON-ROBERTSONIAN T(15;21)(Q25.3;Q22.1) IN AN PEDIATRIC PATIENT WITH PROGENITOR B-CELL ACUTE LYMPHOBLASTIC LEUKEMIA WITH THE IAMP21. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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7
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Ferreira GM, Matos RRC, Monteso KC, Rocha MM, Bizarro MT, Meyer C, Liehr T, Abdelhay E, Binato R, Silva MLM. QUANTITATIVE REAL-TIME PCR (RT-QPCR) COMPARING THE RELATIVE EXPRESSION LEVELS OF GENE TRANSCRIPTS INVOLVED IN A CRYPTIC THREE-WAY TRANSLOCATION T(9;11;19): AN ORIGINAL CASE OF AN INFANT WITH DISMAL PROGNOSIS ACUTE LYMPHOBLASTIC LEUKEMIA. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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da Silva SFR, Ferreira GM, da Silva SL, Alves TMDO, Ribeiro IF, Ribeiro TR, Cavalcante MDCS. Red blood cell and leukocyte alloimmunization in patients awaiting kidney transplantation. Rev Bras Hematol Hemoter 2013; 35:185-8. [PMID: 23904808 PMCID: PMC3728131 DOI: 10.5581/1516-8484.20130043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 12/10/2012] [Indexed: 11/27/2022] Open
Abstract
Objective To determine the rates of red blood cell and leukocyte alloimmunization in patients with chronic kidney disease awaiting kidney transplantation. Methods In this cross-sectional and prospective study, the serum of 393 chronic kidney disease patients on a transplant waiting list in Ceará, Northeastern Brazil were tested for red cell and leukocyte antibodies. In addition, demographic, clinical and laboratory data were collected. Results The average age in the sample of 393 patients was 34.1 ± 14 years. Slightly more than half (208; 52.9%) were male. The average numbers of transfusions and gestations were 3.1 ± 3.3 and 1.6 ± 6, respectively. One third (33.6%) were alloimmunized: 78% with leukocyte antibodies, 9.1% with red cell antibodies and 12.9% with both. Red cell antibodies were detected in 29 cases (7.4%), 17 of whom were women, who had received more transfusions than the males (p-value < 0.0001). The most frequently detected red cell antibodies belonged to the Rh (24.1%) and Kell (13.8%) blood group systems. Leukocyte antibodies were detected in 30.5% of cases, 83 of whom were women, who had received more transfusions than the males (p-value < 0.0001) and were more reactive to panel reactive antibodies (p-value < 0.0001). The mean alloreactivity to panel reactive antibodies was 47.7 ± 31.2%. Conclusion Chronic kidney disease patients on the transplant waiting list in Ceará, Brazil, display high rates of red cell (7.4%) and leukocyte (30.5%) alloimmunization. In this sample, alloimmunization was significantly associated with the number of transfusions and gender.
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Affiliation(s)
- Silvia Fernandes Ribeiro da Silva
- Universidade de Fortaleza - Unifor, Fortaleza, CE, Brazil ; Centro de Pesquisas em Doenças Hepato-Renais - CPDHR, Fortaleza, CE, Brazil
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Braga AD, Miranda JP, Ferreira GM, Bilheiro RP, Duarte ID, Francischi JN, Klein A. Blockade of proteinase-activated receptor-4 inhibits the eosinophil recruitment induced by eotaxin-1 in the pleural cavity of mice. Pharmacology 2010; 86:224-30. [PMID: 20829647 DOI: 10.1159/000319751] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Accepted: 07/15/2010] [Indexed: 11/19/2022]
Abstract
OBJECTIVE AND DESIGN Although proteinase-activated receptor (PAR)-4 has been implicated in inflammation, its role in regulating eosinophil recruitment in response to chemoattractants has not yet been demonstrated. To investigate the contribution of proteinases and PAR-4 activation to eosinophil migration in response to eotaxin-1 or leukotriene B(4) (LTB(4)), the effects of aprotinin or PAR-4 antagonist trans-cinnamoyl-YPGKF-NH(2) (tcY-NH(2)) on eosinophil migration induced by these chemoattractants were investigated. METHODS BALB/c mice were pretreated with aprotinin or tcY-NH(2) (30 μg/mouse) prior to intrapleural injection of LTB(4) or eotaxin-1 and the number of infiltrating eosinophils was determined 48 h later. RESULTS Aprotinin (1 mg/kg) inhibited eosinophil recruitment induced by eotaxin-1 (p < 0.01), but not that induced by LTB(4). Moreover, tcY-NH(2) treatment inhibited eosinophil recruitment in response to eotaxin-1 (p < 0.01 by ANOVA/Tukey post-test). CONCLUSION These data suggest that aprotinin-inhibited proteinases participate in eosinophil migration induced by eotaxin-1 and that PAR-4 activation plays an important role in regulating this migration.
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Affiliation(s)
- A D Braga
- Departamento de Farmacologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
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Ahuja SK, Ferreira GM, Moreira AR. Application of Plackett-Burman design and response surface methodology to achieve exponential growth for aggregated shipworm bacterium. Biotechnol Bioeng 2004; 85:666-75. [PMID: 14966808 DOI: 10.1002/bit.10880] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Here we report the successful implementation of the Plackett-Burman multifactorial design to screen the limiting components for growth and subsequent use of the response surface methodology (RSM) to design a medium that supported exponential growth of the aggregated morphology of the shipworm bacterium, Teredinobacter turnirae. The results obtained with the help of Plackett-Burman design indicated limitations of three components in the growth medium, MnCl2.4H2O, Na2CO3, and K2HPO4. The concentrations of these three components were further optimized using RSM. By increasing the concentrations of the above-mentioned components by 4-fold, 12-fold, and 12-fold, respectively, it became possible to achieve exponential growth of the culture.
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Affiliation(s)
- S K Ahuja
- Baxter Healthcare Corporation, 12140 Indian Creek Court, Beltsville, Maryland 20705, USA
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Ahuja SK, Ferreira GM, Moreira AR. Production of an endoglucanase by the shipworm bacterium, Teredinobacter turnirae. J Ind Microbiol Biotechnol 2004; 31:41-7. [PMID: 14745582 DOI: 10.1007/s10295-004-0113-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2001] [Accepted: 12/09/2003] [Indexed: 11/25/2022]
Abstract
The nutritional behavior of a cellulolytic nitrogen-fixing shipworm bacterium, Teredinobacter turnirae, is described, with respect to various carbon and nitrogen sources, in terms of endoglucanase production. Also, the effects of various surfactants on enzyme production are reported. Among the carbon sources, sucrose results in the maximum enzyme production, followed by cellulose. Ammonium phosphate proves to be the best nitrogen source for endoglucanase production. Various surfactants enhance the enzyme titers, with Triton X-100 yielding the best results. A combination of the above-mentioned components improves the enzyme production by 3.6-fold.
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Affiliation(s)
- S K Ahuja
- Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
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12
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Abstract
AIMS A morphology transition for the marine bacterium, Teredinobacter turnirae is reported. METHODS AND RESULTS When grown in the rod-shaped morphology, the cells require high concentrations of NaCl (0.3 mol x l(-1)) and secrete extracellular protease and endoglucanase activity. When this bacterium is grown in a medium containing casein as a sole carbon and nitrogen source, a major change in morphology to a stable aggregated form is obtained. CONCLUSION In the aggregated morphology, much higher protease production rates (170 Units x ml(-1) x d-1 for aggregates vs. 15 Units x ml(-1) x d(-1) for rods, for the same initial biomass) and negligible endoglucanase titres are obtained. In addition, the aggregated morphology does not require sodium chloride for growth. SIGNIFICANCE AND IMPACT OF THE STUDY The phenomenon reported here describes a novel relationship between the cell morphology and the biochemical characteristics of the bacterium.
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Affiliation(s)
- G M Ferreira
- Department of Chemical and Biochemical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
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13
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Abstract
Data from the article by Brodsky et al. (2000) have been examined in order to confirm that the fluctuations they report are not random but have a rhythmic basis, thereby verifying their conclusions regarding the existence of periodicity in protein synthesis. Reasons are outlined why oscillations should be expected in all cellular biochemical studies. Associated practical problems are briefly discussed together with comments on the validity and value of less rigorous methods of analysis. The subject of aliasing is raised as justification for doubting the validity of much published data, especially where periodicity has not been suspected. The existence of oscillations indicates the need for a thorough re-evaluation of our understanding of cell biochemistry.
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14
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Abstract
Periodogram analyses of the temporal variations of several cellular oscillations occasionally reveal the existence of short duration bands containing a wide range of frequencies. The possibility is considered that these are due to the transient compliance with chaotic conditions.
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Affiliation(s)
- D A Gilbert
- 113 Dellow Close, Ilford, Essex, IG2 7ED, UK
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15
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Ferreira GM, Lourens DC, van Vuuren M. The prevalence of bovine viral diarrhoea antibodies in selected South African dairy herds, and control of the disease. J S Afr Vet Assoc 2000; 71:10-3. [PMID: 10949510 DOI: 10.4102/jsava.v71i1.669] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The prevalence of bovine viral diarrhoea (BVD) serologically positive animals in 18 dairy herds with clinical and pathological lesions suggestive of BVD infection, the post-vaccinal seroconversion rates in negative animals vaccinated twice with an inactivated BVD vaccine, and the control measures taken, are described. The pathological and histopathological findings in 6 necropsies performed on animals that died in 5 separate herds closely resembled published descriptions. Positive immunohistochemistry results in 3 cases confirmed the diagnosis in those animals. In 1 herd the prevalence of prevaccinal BVD antibodies was only 36.8%, while the prevalence varied from 79.85 to 100% in the remainder. Control measures taken included immunoprophylaxis with an inactivated vaccine, culling animals that were serologically negative after vaccination that were regarded as probably persistently infected (PI) and the implementation of additional biosecurity measures. The prevalence of serologically negative PI animals in 10 herds varied from 0.38 to 4.04%, with 8 herds less than 1% and 2 herds at 2.79% and 4.04%, respectively. Methods based on vaccinating the herd, followed by serological testing and culling cattle that did not develop an antibody titre, are not reliable. The identification of PI animals should be confirmed by isolation of the virus or identification of the antigen.
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Affiliation(s)
- G M Ferreira
- Department of Production Animal and Community Health, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
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Ferreira GM, Hammond KD, Gilbert DA. Distinct, very high frequency oscillations in the activity and amount of active isozyme of lactate dehydrogenase in murine erythroleukaemic cells and a cell-free system. Cell Biol Int 1996; 20:625-33. [PMID: 8948125 DOI: 10.1006/cbir.1996.0082] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Electrophoretic and kinetic determinations of the activity of lactate dehydrogenase in murine erythroleukaemic (MEL) cells, sampled at 1 min intervals, reveal distinct oscillations in the activity and amount of active isozyme. Both oscillations have periods in the range of 2-6 min (probably less) and both appear to be rhythmically modulated with respect to period, amplitude and mean. The oscillations also occur in cell-free systems, a fact which throws doubt on the value of studies where it is assumed that such preparations have constant composition.
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Affiliation(s)
- G M Ferreira
- Department of Medical Biochemistry, Medical School, University of the Witwatersrand, Parktown, Johannesburg, South Africa
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Ferreira GM, Hammond KD, Gilbert DA. Independent high-frequency oscillations in the amounts of individual isozymes of lactate dehydrogenase in HL60 cells. Cell Biol Int 1996; 20:607-11. [PMID: 8948122 DOI: 10.1006/cbir.1996.0079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Early studies, using kinetic methods, suggested that the isozyme pattern of lactate dehydrogenase in various cells oscillated with time. More recent electrophoretic studies on murine erythroleukaemic cells (which exhibit only one isozyme) indicated very high frequency variations (period 2 min or less) in the amount of the lone active isozyme. We now show that in HL60 cells, the activity stain intensities of the two major isozyme bands both oscillate but the temporal variations are distinct. As with other cellular rhythms, each of the two periodicities seem to be modulated in cyclic fashion with respect to period, amplitude and mean levels, the periods of both the primary and modulating rhythms being of the order of 10-15 min or probably much less.
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Affiliation(s)
- G M Ferreira
- Department of Medical Biochemistry, Medical School, University of the Witwatersrand, Parktown, Johannesburg, South Africa
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Ferreira GM, Wölfle H, Hammond KD, Gilbert DA. High frequency oscillations in the activity of phosphotyrosine phosphatase in murine erythroleukaemic cells: action of insulin and hexamethylene bisacetamide. Cell Biol Int 1996; 20:599-605. [PMID: 8948121 DOI: 10.1006/cbir.1996.0078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have previously reported oscillations in the activities of the phosphoamino acid phosphatases in murine erythroleukaemic cells. In keeping with our predictions we now show that the phosphotyrosine phosphatase activity rhythm has a much shorter period than originally seemed the case, being of the order of 10 min and probably less. The periodic changes show evidence of rhythmic modulation of mean, period and amplitude as with all other cellular oscillations studied. Insulin decreases the frequency of the rhythm while the inducer of differentiation, hexamethylene bisacetamide (HMBA) decreases its amplitude. Current ideas on phosphorylation dynamics in relation to metabolism and mitosis may need to be revised in the light of the observations.
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Affiliation(s)
- G M Ferreira
- Department of Medical Biochemistry, Medical School, University of the Witwatersrand, Parktown, Johannesburg, South Africa
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Ferreira GM, Hammond KD, Gilbert DA. Oscillatory variations in the amount of protein extractable from murine erythroleukemia cells: stimulation by insulin. Biosystems 1994; 32:183-90. [PMID: 7919115 DOI: 10.1016/0303-2647(94)90041-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The amount of protein extractable from murine erythroleukemia (MEL) cells varies in an oscillatory manner at high frequency and high amplitude as it does for several other cell lines. Moreover, the rhythm appears to be modulated in periodic fashion with respect to the mean, period and amplitude. The phenomenon thus seems to be universal and fundamental. Time series analyses support the view that several periodicities contribute to the observed protein rhythm. Insulin affects the dynamics as it does for both morphological and phosphorylation oscillations. Caution is necessary in the interpretation of 'specific activities' of cellular components and in electrophoretic studies wherein equal amounts of protein are applied to the wells in an effort to correct for random errors.
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Affiliation(s)
- G M Ferreira
- Department of Medical Biochemistry, Medical School, University of the Witwatersrand, Parktown, Johannesburg, South Africa
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Abstract
The phosphorylation potentials of two proteins (M(r) 81 kDa and 63 kDa) in extracts of murine erythroleukemic (MEL) cells both vary in an oscillatory manner, sometimes changing by as much as 100-fold in 10 min. Direct analysis of the temporal changes indicates the existence of periodic modulation of the frequencies, amplitudes and mean levels of the two rhythms. In both cases, periodogram analyses, by two methods, confirm the presence of several oscillations having periods in the range 20-100 min which tend to occur in (pseudo) periodic bursts. Insulin has been found to enhance these oscillations in a manner comparable with its effect on rhythmic variations in cell morphology. Despite the marked similarity in the behaviour of the two proteins, no particular phase relationship existed between the two temporal variations, suggesting differences between the underlying driving forces.
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Affiliation(s)
- G M Ferreira
- Department of Medical Biochemistry, Medical School, University of the Witwatersrand, Parktown, Johannesburg, South Africa
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Amato Neto V, Moreira AA, Ferreira GM, do Nascimento SA, Matsubara L, Campos R, Pinto PL. [Evaluation of the therapeutic effect of albendazole on experimental and human infections by Hymenolepis nana]. Rev Inst Med Trop Sao Paulo 1990; 32:185-8. [PMID: 2135371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
With the objective of knowing adequately the spectrum of activity of albendazole against intestinal helminthiases, we made observations regarding hymenolepiasis caused by Hymenolepis nana. Two series of investigations were carried out: a) treatment of mice with single doses of either 25 or 50 mg/kg, repeated after ten days, using as controls animals treated with 25 mg/kg of praziquantel or not treated with any antiparasitic drugs; b) treatment of adults and children with 400 mg daily for three consecutive days, repeated after ten days.
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Affiliation(s)
- V Amato Neto
- Laboratório de Investigação Médica-Parasitologia, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, Brasil
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