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Ebert R, P T, Olalla-Saad ST, Campos PM. LACUNAS NA FORMAÇÃO E ACESSO: A AUTOPERCEPÇÃO DE HEMATOLOGISTAS BRASILEIROS SOBRE OS CUIDADOS PALIATIVOS. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.1103] [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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Congrains-Castillo A, Niemann FS, Santos Duarte AS, Olalla-Saad ST. LEF1-AS1, long non-coding RNA, inhibits proliferation in myeloid malignancy. J Cell Mol Med 2019; 23:3021-3025. [PMID: 30770626 PMCID: PMC6433713 DOI: 10.1111/jcmm.14152] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 12/13/2018] [Accepted: 12/17/2018] [Indexed: 12/30/2022] Open
Abstract
LEF1 antisense RNA 1 (LEF1‐AS1) is an antisense long non‐coding RNA encoded in the lymphoid enhancer‐binding factor 1 (LEF1) locus. LEF1‐AS1 is a conserved transcript dysregulated in hematopoiesis. This study aimed to functionally characterize the role of this transcript in myeloid malignancy and explore a possible regulatory effect of LEF1‐AS1 upon LEF1. We show that LEF1‐AS1 is highly expressed in normal hematopoietic stem cells but barely detectable in myeloid malignant cell lines. Additionally, bone marrow cells from myelodysplastic syndrome (n=12) and acute myeloid malignancy patients (n=28) expressed significantly reduced levels of LEF1‐AS1 compared to healthy controls (n=15). Artificial LEF1‐AS1 over‐expression inhibited proliferation in HL60 and led to an upregulation of tumor suppressors p21 and p27, and reduced ERK1/2 activation. Unexpectedly, no underlying modulation of LEF1 was detected. Ectopic expression of LEF1‐AS1 also inhibited proliferation in HELA, a cell line lacking endogenous expression of LEF1, supporting a LEF1‐independent mechanism. Additionally, transient over‐expression of LEF1‐AS1 in AML patient cells also led to reduced proliferation and colony formation capacity. We used a mass spectrometry‐based proteomics approach. Proteomic quantification identified the modulation of an important metabolic regulator, Fumarase, and concomitant accumulation of the metabolite fumarate.
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Affiliation(s)
| | - Fernanda S Niemann
- Hematology and Hemotherapy Center, Hemocentro-Unicamp, São Paulo, Brazil
| | | | - Sara T Olalla-Saad
- Hematology and Hemotherapy Center, Hemocentro-Unicamp, São Paulo, Brazil
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Ferreira FA, Benites BD, Costa FF, Gilli S, Olalla-Saad ST. Recombinant erythropoietin as alternative to red cell transfusion in sickle cell disease. Vox Sang 2019; 114:178-181. [PMID: 30695814 DOI: 10.1111/vox.12750] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 12/25/2018] [Accepted: 12/27/2018] [Indexed: 11/28/2022]
Abstract
Disturbances in the physiological regulation of erythropoietin (EPO) in patients with sickle cell disease (SCD) may contribute to worsening anaemia and increased transfusion requirements, but the use of recombinant EPO in this group of patients is controversial. The objective of this study was to evaluate the use of this drug in adult patients with SCD and its effects on haemoglobin levels and transfusion requirements. We conducted a retrospective analysis at the University of Campinas, with nineteen adults with a diagnosis of SCD (HbSS and HbS/β+ thalassaemia), who had received at least 1 year of EPO therapy between 2007 and 2014. Haemoglobin concentrations and trends of variation in transfused RBC volumes were compared before and after EPO administration. We observed that seven patients had a good response to treatment (Hb increment higher than 1·5 g/dl) and nine had a partial response (0·5-1·5 g/dl increment) and there was a significant decrease in the need for transfusion amongst those who usually required regular transfusions. There were no increases in the rates of vaso-occlusive crisis or venous thromboembolism in comparison to the year before the onset of the therapy. Erythropoietin therapy led to a marked increase in haemoglobin concentration with a concomitant decrease in the demand for transfusion. Considering all complications related to allogeneic transfusion, we believe that EPO therapy represents an important therapeutic tool in sickle cell anaemia.
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Affiliation(s)
- Francisco A Ferreira
- Hematology and Transfusion Medicine Center, University of Campinas, Campinas, Brazil
| | - Bruno D Benites
- Hematology and Transfusion Medicine Center, University of Campinas, Campinas, Brazil
| | - Fernando F Costa
- Hematology and Transfusion Medicine Center, University of Campinas, Campinas, Brazil
| | - Simone Gilli
- Hematology and Transfusion Medicine Center, University of Campinas, Campinas, Brazil
| | - Sara T Olalla-Saad
- Hematology and Transfusion Medicine Center, University of Campinas, Campinas, Brazil
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Dominical VM, Vital DM, Garrido VT, Silveira AAA, Olalla-Saad ST, Costa FF, Conran N. Interactions of sickle red blood cells with neutrophils are stabilized on endothelial cell layers. Blood Cells Mol Dis 2015; 56:38-40. [PMID: 26603722 DOI: 10.1016/j.bcmd.2015.10.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 10/26/2015] [Indexed: 11/26/2022]
Affiliation(s)
- Venina Marcela Dominical
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil
| | - Daiana Morelli Vital
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil
| | - Vanessa Tonin Garrido
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil
| | | | - Sara T Olalla-Saad
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil
| | - Fernando Ferreira Costa
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil
| | - Nicola Conran
- Hematology Center, School of Medicine, University of Campinas - UNICAMP, Campinas, Sao Paulo, Brazil.
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Lopes FCM, Traina F, Almeida CB, Leonardo FC, Franco-Penteado CF, Garrido VT, Colella MP, Soares R, Olalla-Saad ST, Costa FF, Conran N. Key endothelial cell angiogenic mechanisms are stimulated by the circulating milieu in sickle cell disease and attenuated by hydroxyurea. Haematologica 2015; 100:730-9. [PMID: 25769545 DOI: 10.3324/haematol.2014.119727] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 03/05/2015] [Indexed: 01/05/2023] Open
Abstract
As hypoxia-induced inflammatory angiogenesis may contribute to the manifestations of sickle cell disease, we compared the angiogenic molecular profiles of plasma from sickle cell disease individuals and correlated these with in vitro endothelial cell-mediated angiogenesis-stimulating activity and in vivo neovascularization. Bioplex demonstrated that plasma from patients with steady-state sickle cell anemia contained elevated concentrations of pro-angiogenic factors (angiopoietin-1, basic fibroblast growth factor, vascular endothelial growth factor, vascular endothelial growth factor-D and placental growth factor) and displayed potent pro-angiogenic activity, significantly increasing endothelial cell proliferation, migration and capillary-like structure formation. In vivo neovascularization of Matrigel plugs was significantly greater in sickle cell disease mice than in non-sickle cell disease mice, consistent with an up-regulation of angiogenesis in the disease. In plasma from patients with hemoglobin SC disease without proliferative retinopathy, anti-angiogenic endostatin and thrombospondin-2 were significantly elevated. In contrast, plasma from hemoglobin SC individuals with proliferative retinopathy had a pro-angiogenic profile and more significant effects on endothelial cell proliferation and capillary formation than plasma from patients without retinopathy. Hydroxyurea therapy was associated with significant reductions in plasma angiogenic factors and inhibition of endothelial cell-mediated angiogenic mechanisms and neovascularization. Thus, individuals with sickle cell anemia or hemoglobin SC disease with retinopathy present a highly angiogenic circulating milieu, capable of stimulating key endothelial cell-mediated angiogenic mechanisms. Combination anti-angiogenic therapy to prevent the progression of unregulated neovascularization and associated manifestations in sickle cell disease, such as pulmonary hypertension, may be indicated; furthermore, the benefits and drawbacks of the potent anti-angiogenic effects of hydroxyurea should be clarified.
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Affiliation(s)
- Flavia C M Lopes
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Fabiola Traina
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil Department of Internal Medicine, University of São Paulo at Riberão Preto Medical School, Riberão Preto, Brazil
| | - Camila B Almeida
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Flavia C Leonardo
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Carla F Franco-Penteado
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Vanessa T Garrido
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Marina P Colella
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Raquel Soares
- Department of Biochemistry (I3S), Faculty of Medicine, University of Porto, Portugal
| | - Sara T Olalla-Saad
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Fernando F Costa
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
| | - Nicola Conran
- INCT de Sangue, Hematology Center, School of Medical Science, University of Campinas - UNICAMP, São Paulo, Brazil
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Olalla-Saad ST. Fermented papaya preparation for β-thalassemia? Expert Rev Hematol 2010; 3:265-8. [PMID: 21082979 DOI: 10.1586/ehm.10.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This article comments on the results obtained by Fibach et al., which showed reduction of oxidative status in red blood cells of patients with β- and E-β-thalassemia (β-thal) treated with fermented papaya preparation. The study was a three-center, prospective study, including eight patients with β-thal intermedia, four β-thal major and seven E-β-thal patients. The patients received 3 g of fermented papaya preparation (FPP) two- to three-times a day after meals, respectively, for 3 months. A marked decrease in reactive oxygen species, lipid peroxidation and phosphatidylserine externalization and an increase in GSH were detected in both groups of patients, indicating that FPP is efficient in reducing the oxidative stress of these red blood cells. The results are very encouraging as all parameters analyzed indicated the reduction of red blood cells oxidative stress by the action of a natural and inexpensive product.
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Affiliation(s)
- Sara T Olalla-Saad
- Hemocentro-Unicamp, Cidade Universitária Zeferino Vaz, CEP 13083-970, Campinas, SP, Brazil.
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Baratti MO, Moreira YB, Traina F, Costa FF, Verjovski-Almeida S, Olalla-Saad ST. Identification of protein-coding and non-coding RNA expression profiles in CD34+ and in stromal cells in refractory anemia with ringed sideroblasts. BMC Med Genomics 2010; 3:30. [PMID: 20633296 PMCID: PMC2914047 DOI: 10.1186/1755-8794-3-30] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 07/15/2010] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Myelodysplastic syndromes (MDS) are a group of clonal hematological disorders characterized by ineffective hematopoiesis with morphological evidence of marrow cell dysplasia resulting in peripheral blood cytopenia. Microarray technology has permitted a refined high-throughput mapping of the transcriptional activity in the human genome. Non-coding RNAs (ncRNAs) transcribed from intronic regions of genes are involved in a number of processes related to post-transcriptional control of gene expression, and in the regulation of exon-skipping and intron retention. Characterization of ncRNAs in progenitor cells and stromal cells of MDS patients could be strategic for understanding gene expression regulation in this disease. METHODS In this study, gene expression profiles of CD34+ cells of 4 patients with MDS of refractory anemia with ringed sideroblasts (RARS) subgroup and stromal cells of 3 patients with MDS-RARS were compared with healthy individuals using 44 k combined intron-exon oligoarrays, which included probes for exons of protein-coding genes, and for non-coding RNAs transcribed from intronic regions in either the sense or antisense strands. Real-time RT-PCR was performed to confirm the expression levels of selected transcripts. RESULTS In CD34+ cells of MDS-RARS patients, 216 genes were significantly differentially expressed (q-value <or= 0.01) in comparison to healthy individuals, of which 65 (30%) were non-coding transcripts. In stromal cells of MDS-RARS, 12 genes were significantly differentially expressed (q-value <or= 0.05) in comparison to healthy individuals, of which 3 (25%) were non-coding transcripts. CONCLUSIONS These results demonstrated, for the first time, the differential ncRNA expression profile between MDS-RARS and healthy individuals, in CD34+ cells and stromal cells, suggesting that ncRNAs may play an important role during the development of myelodysplastic syndromes.
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Affiliation(s)
- Mariana O Baratti
- Department of Internal Medicine, School of Medical Science, Hematology and Hemotherapy Center, University of Campinas, 13083-970 Campinas, SP, Brazil
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