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Limão R, Brás R, Pedro E, Silva SL, Lopes A. Dupilumab in patients with atopic dermatitis: assessing treatment response, clinical features and potential biomarkers in real-life. Eur Ann Allergy Clin Immunol 2024. [PMID: 38591168 DOI: 10.23822/eurannaci.1764-1489.341] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Summary Background. The clinical and pathophysiological heterogeneity of atopic dermatitis (AD) endophenotypes is associated with wide diversity in response to therapy. The aim of this study was to evaluate the response to dupilumab in a group of AD patients and identify clinical/immunological features associated with different patterns of response. Methods. A retrospective observational study was performed, including 30 adults with AD who completed 12 months treatment with dupilumab, in a Portuguese Immunoallergology Department. Demographic, clinical, and immunological data were analyzed, including total serum IgE, sensitization to aeroallergens, peripheral eosinophilia and inflammatory biomarkers (sedimentation rate, C-reactive protein and lactate dehydrogenase-LDH). Patients who achieved EASI-75/EASI ≤ 7, SCORAD-75/SCORAD ≤ 24, NRS-pruritus ≤ 4 or DLQI≤5 at 6 months of treatment were considered responders and those that achieved all these goals at 16 weeks were considered super-responders. Results. Clinical evaluation revealed a significant reduction in median SCORAD, EASI, DLQI, NRS-pruritus and NRS-sleep over 12 months on dupilumab (p less than 0.01), in parallel with decrease in serum Th2 pathway biomarkers and LDH. All patients responded to dupilumab, and 26.7% were super-responders, supporting that dupilumab is highly effective in moderate to severe Th2-high AD. Conclusions. In this cohort, none of the evaluated biomarkers at baseline were associated with a better/earlier clinical response to dupilumab. Dupilumab treatment for 52 weeks resulted in a significant and sustained reduction in blood levels of total IgE and allergen-specific IgE to aeroallergens. The potential long-term clinical benefit of these effects, even after discontinuing dupilumab therapy in patients with AD, should be explored to a greater extent.
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Affiliation(s)
- R Limão
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - R Brás
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - E Pedro
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - S L Silva
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- University Clinic of Immunology, Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal
- Instituto de Medicina Molecular João Lobo Antunes, Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - A Lopes
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- University Clinic of Immunology, Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal
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Brás R, Limão R, Pedro E, Lopes A. Pruritus burden assessment in severe atopic dermatitis patients under dupilumab: response predictor? Eur Ann Allergy Clin Immunol 2023. [PMID: 37503751 DOI: 10.23822/eurannaci.1764-1489.308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Affiliation(s)
- R Brás
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - R Limão
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - E Pedro
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - A Lopes
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- Universitary Clinic of Immunoallergology, Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal
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Brás R, Goncalves J, Araújo C, Godinho Santos A, Costa L, Pedro E, Caiado J. sIgE/sIgG4 profile in platinum desensitization: is there immunological tolerance? Eur Ann Allergy Clin Immunol 2023. [PMID: 37317706 DOI: 10.23822/eurannaci.1764-1489.302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Affiliation(s)
- R Brás
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - J Goncalves
- Research Institute for Medicines (iMed), Faculty of Farmacy, University of Lisbon, Lisbon, Portugal
| | - C Araújo
- Research Institute for Medicines (iMed), Faculty of Farmacy, University of Lisbon, Lisbon, Portugal
| | - A Godinho Santos
- Research Institute for Medicines (iMed), Faculty of Farmacy, University of Lisbon, Lisbon, Portugal
| | - L Costa
- Department of Oncology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, EPE, Lisbon, Portugal
| | - E Pedro
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - J Caiado
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
- Research Institute for Medicines (iMed), Faculty of Farmacy, University of Lisbon, Lisbon, Portugal
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Esteves Caldeira L, Limão R, Brás R, Pedro E, Costa C. A real-world characterization of a cohort with eosinophilic esophagitis: looking for severity biomarkers. Eur Ann Allergy Clin Immunol 2023. [PMID: 36975751 DOI: 10.23822/eurannaci.1764-1489.292] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Summary Background. Eosinophilic esophagitis (EoE) is an immune-mediated chronic esophageal disease, with frequent association with atopy. A validated non/minimally invasive biomarker of disease severity has not been identified. We aimed to determine if sensitization to airborne and food allergens correlates with disease severity, and to evaluate the association between clinical and laboratory characteristics with the severity of EoE. Methods. Retrospective study of EoE patients observed in a differentiated center, 2009-2021. The association between patients' diagnosis age, disease duration before diagnosis, sensitization to airborne/food allergens, serum total IgE and peripheral blood eosinophil values and severe clinical disease (presence of symptoms with a significant impact on quality of life and/or ≥ 1 hospital admission due to EoE complications, namely severe dysphagia, food impaction or esophageal perforation) and histological severe disease (≥ 55 eos/hpf and/or microabscesses in esophageal biopsies) was evaluated. Results. 92 patients were observed, 83% male, 87% atopic. There was a mean delay in diagnosis of 4 years (range 0-31). 84% had aeroallergen sensitization and 71% food sensitization. Food impaction and dysphagia were the most frequent symptoms, and severe clinical disease was observed in 55%. Histologically, 37% had severity criteria. Patients with severe clinical disease had a significantly longer mean disease duration before diagnosis than patients without severe clinical disease (79 vs 15 months, p = 0.021). Patients who described food impaction were significantly older at time of diagnosis than those who have never had impaction (18 vs 9 years, p less than 0.001). There was no significant association (p less than 0.05) between sensitization, serum total IgE and peripheral blood eosinophil values and clinical or histological severity. Conclusions. An older age at diagnosis and a longer disease duration before diagnosis appear to be useful for predicting EoE clinical severity. Despite having been demonstrated a high prevalence of allergic disease, the presence of sensitization to airborne and/or food allergens do not seem to be useful for predicting clinical or histological severity.
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Affiliation(s)
- L Esteves Caldeira
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - R Limão
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - R Brás
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - E Pedro
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
| | - C Costa
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
- University Clinic of Immunoallergology, Medicine Faculty of Lisbon, Lisbon, Portugal
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Silva MIT, Brás R, Paulino M, Cabral Duarte F, Pereira Santos MC, Costa C. Clinical characterization of peach allergic patients and respective molecular sensitization profile with ALEX®2 macroarray. Eur Ann Allergy Clin Immunol 2023. [PMID: 36786343 DOI: 10.23822/eurannaci.1764-1489.284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- M I T Silva
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- Clinical Immunology Lab, Faculty of Medicine, Instituto de Medicina Molecular João Lobo Antunes, University of Lisbon, Lisbon, Portugal
| | - R Brás
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- University Clinic of Immunoalergology, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
| | - M Paulino
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - F Cabral Duarte
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - M C Pereira Santos
- Clinical Immunology Lab, Faculty of Medicine, Instituto de Medicina Molecular João Lobo Antunes, University of Lisbon, Lisbon, Portugal
- University Clinic of Immunoalergology, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
| | - C Costa
- Department of Immunoallergology, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- University Clinic of Immunoalergology, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
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Goncalves L, Gonçalves D, Esteban Casanelles T, Soares de Pinho I, Barroso T, Patel V, Esperanca-Martins M, Brás R, Lobo-Martins S, Semedo P, Moreira C, Teixeira Sousa A, Mansinho A, Marques Da Costa L. 100P Immunotherapy around the clock: Impact on stage IV melanoma. Immuno-Oncology and Technology 2022. [DOI: 10.1016/j.iotech.2022.100204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Dâmaso S, Paiva R, Pinho I, Martins M, Brás R, Alvim C, Costa A, Costa L. P-265 High peripheral monocyte count is associated with increased risk of venous thromboembolism in patients with advanced pancreatic cancer. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.04.355] [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: 11/01/2022] Open
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Brás R, Caiado J, Pedro E. Rapid desensitization to acetylsalicylic acid in patients with ischemic heart disease: 10-year experience of a portuguese allergy department. Eur Ann Allergy Clin Immunol 2021. [PMID: 34313087 DOI: 10.23822/eurannaci.1764-1489.230] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Summary Introduction. Managing Acetylsalicylic Acid (ASA) hypersensitivity (HS) in patients with ischemic heart disease (IHD) is a challenge. Data on Rapid Desensitization (RD) to ASA is scarce. We aimed to report the outcomes of our 10-year experience with RD to ASA. Methods. Retrospective, observational, single-center study of patients with ASA HS and suspected IHD who underwent RD to ASA between March 2009 and February 2019. Results. Fifty patients were included. ASA HS presentation ranged from urticaria (56%) to anaphylaxis (32%). Regarding cardiologic diagnoses, 40 patients (80%) had acute coronary syndrome and 10 (20%) stable angina. The majority of patients (N = 36.72%) underwent percutaneous coronary intervention. RD to ASA was successful in all patients. Two patients presented a mild HS reaction during the RD, which was promptly treated, and subsequent daily doses of ASA 100 mg were tolerated. Conclusions. In our cohort, RD to ASA in patients with ASA HS and IHD was very effective and safe.
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Affiliation(s)
- R Brás
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - J Caiado
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal.,University Clinic of Immunoallergology, Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - E Pedro
- Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
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Brás R, Paulino M, Varandas C, Coutinho C, Silva MI, Limão R, Costa C, Alonso E, Pedro E, Mendes A. Mepolizumab for severe eosinophilic asthma - A one-year real life Portuguese study. Pulmonology 2021; 27:579-581. [PMID: 34219042 DOI: 10.1016/j.pulmoe.2021.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/21/2021] [Accepted: 05/24/2021] [Indexed: 10/21/2022] Open
Affiliation(s)
- R Brás
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal.
| | - M Paulino
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - C Varandas
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - C Coutinho
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - M I Silva
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - R Limão
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - C Costa
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - E Alonso
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - E Pedro
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - A Mendes
- Immunoallergology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
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Pais HL, Mansinho A, Branco F, Alvim C, Lobo-Martins S, Fernandes G, Fernandes L, Matos A, Paiva R, Dâmaso S, Brás R, Pinho I, Donato A, Semedo P, Albuquerque J, Ribeiro L. P-65 Locally advanced/metastatic gastric cancer: Real-world data on first-line treatment with oxaliplatin and cisplatin-based doublets. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.147] [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: 10/23/2022] Open
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Dâmaso S, Paiva R, Pinho I, Martins M, Brás R, Costa A, Quintela A, Pinto C, Vendrell I, Costa L. P-150 Khorana and PROTECHT scores in predicting the risk of venous thromboembolism in pancreatic cancer: Which performed better? Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.232] [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: 10/23/2022] Open
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Casimiro S, Ferreira A, Alho I, Melo M, Brás R, Costa AL, Sousa AR, Mansinho A, Abreu C, Pulido C, Macedo D, Pacheco TR, Costa L. Abstract P4-09-06: The prognostic role of RANK single nucleotide polymorphisms in breast cancer patients with bone metastases. Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p4-09-06] [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: 11/16/2022]
Abstract
Abstract
Background: Receptor activator of NF-kB (RANK) pathway regulates bone remodeling and is involved in breast cancer (BC) progression. RANK over-expression in primary BC associates with poor prognosis and metastasis development. In patients with BC, RANK and RANK-ligand (RANKL) single nucleotide polymorphisms (SNPs) have also been associated with BC risk and bone metastasis (BM)-free survival , respectively. Here we analyze the association of five RANK missense SNPs with prognosis of patients with BM from BC.
Methods: Missense RANK SNPs (rs34945627, rs12721431, rs35184120, rs35993683, rs61751992) were genotyped in germline DNA from a retrospective cohort of 76 patients with BM from BC, under bisphosphonates; and a cohort of 80 healthy volunteers (samples from Biobanco-IMM, Lisbon, Portugal). Genotypic allelic frequencies were assessed using TaqMan assays (Applied Biosystems). SNP rs34945627 was analyzed with regard to clinicopathological characteristics, skeletal-related events (SRE), bone progression-free interval (BPFi), and overall survival (OS). Univariate association with clinicopathological characteristics was performed using Fisher's exact test and Wilcoxon rank-sum test; univariate differences between survival rates were tested for significance using the log-rank test, while multivariate analysis for survival was tested using Cox proportional hazards models.
Results: SNP rs34945627 had a minor allele frequency of 11.84% (n=9) in BC patients versus 1.25% (n=1) in healthy individuals, whereas the remaining SNPs had a minor allele frequency of 2.60% (n=2) in BC patients. Therefore, for inferential analysis only SNP rs34945627 was considered. No differences between alleles were observed regarding clinicopathological characteristics, including treatment. Homozygous patients (CC) had increased OS when compared to heterozygous patients (CT) controlling for age at diagnosis, visceral involvement, radiographic pattern of BM and baseline urine NTX (adjusted HR 5.76, 95% CI 2.10-15.81; p<0.001). No association could be seen with regard to SREs (adjusted HR 1.43, 95% CI 0.46-4.46; p=0.54) or BPFi (adjusted HR 0.26, 95% CI 0.06-1.17; p=0.08).
Conclusions: RANK SNP rs34945627 seems to be a marker of poor prognosis in patients with BC and BM. Further studies are required to characterize the biological and clinical significance of this finding.
Citation Format: Casimiro S, Ferreira A, Alho I, Melo M, Brás R, Costa AL, Sousa AR, Mansinho A, Abreu C, Pulido C, Macedo D, Pacheco TR, Costa L. The prognostic role of RANK single nucleotide polymorphisms in breast cancer patients with bone metastases. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P4-09-06.
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Affiliation(s)
- S Casimiro
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - A Ferreira
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - I Alho
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - M Melo
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - R Brás
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - AL Costa
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - AR Sousa
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - A Mansinho
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - C Abreu
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - C Pulido
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - D Macedo
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - TR Pacheco
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
| | - L Costa
- Instituto de Medicina Molecular, Lisboa, Portugal; Hospital de Santa Maria, Oncology Division, Lisboa, Portugal; Faculdade de Medicina de Lisboa, Lisboa, Portugal
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Faria A, Gabriel R, Abrantes J, Brás R, Sousa M, Moreira H. Ankle stiffness in postmenopausal women: influence of hormone therapy and menopause nature. Climacteric 2010; 13:265-70. [DOI: 10.3109/13697130903437896] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Brás R, Gomes A, Ferra MIA, Pinheiro HM, Gonçalves IC. Monoazo and diazo dye decolourisation studies in a methanogenic UASB reactor. J Biotechnol 2005; 115:57-66. [PMID: 15607225 DOI: 10.1016/j.jbiotec.2004.08.001] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [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: 02/26/2004] [Revised: 08/02/2004] [Accepted: 08/09/2004] [Indexed: 11/19/2022]
Abstract
Mixed anaerobic bacterial consortia have been show to reduce azo dyes and batch decolourisation tests have also demonstrated that predominantly methanogenic cultures also perform azo bond cleavage. The anaerobic treatment of wool dyeing effluents, which contain acetic acid, could thus be improved with a better knowledge of methanogenic dye degradation. Therefore, the decolourisation of two azo textile dyes, a monoazo dye (Acid Orange 7, AO7) and a diazo dye (Direct Red 254, DR254), was investigated in a methanogenic laboratory-scale Upflow Anaerobic Sludge Blanket (UASB), fed with acetate as primary carbon source. As dye concentration was increased a decrease in total COD removal was observed, but the acetate load removal (90%) remained almost constant. A colour removal level higher than 88% was achieved for both dyes at a HRT of 24h. The identification by HPLC analysis of sulfanilic acid, a dye reduction metabolite, in the treated effluent, confirmed that the decolourisation process was due mainly to azo bond reduction. Although, HPLC chromatograms showed that 1-amino-2-naphthol, the other AO7 cleavage metabolite, was removed, aeration batch assays demonstrated that this could be due to auto-oxidation and not biological mineralization. At a HRT of 8h, a more extensive reductive biotransformation was observed for DR254 (82%) than for AO7 (56%). In order to explain this behaviour, the influence of the dye aggregation process and chemical structure of the dye molecules are discussed in the present work.
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Affiliation(s)
- R Brás
- Chemistry Department, University of Beira Interior, R. Marquês D'Avila e Bolama, 6200 Covilhã, Portugal
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Abstract
Most of the published studies on azo dye colour removal involve anaerobic mixed cultures and there is some interest in the knowledge of how dye reduction occurs, if by facultative, strictly anaerobic or both bacterial trophic groups present in classic anaerobic digestors. This paper describes the behaviour of methanogenic and mixed bacteria cultures on the colour removal in batch systems, of a commercial azo dye, C.I. Acid Orange 7, used in paper and textile industries. The aim of this study is to demonstrate, by analysing dye decolourisation, that it occurs with mixed cultures as well as with strictly anaerobic (methanogenic) cultures. Tests were performed with a range of dye concentrations between 60 and 300 mg x l(-1). The influence of dye concentration on the carbon source removal and decolourisation processes was studied. The effect of carbon source concentration on colour removal was also analysed for both cultures. The degradation rates in mixed and methanogenic cultures were compared. The consumption of carbon source was monitored by COD analysis and dye degradation by ultraviolet-visible spectrophotometry and thin layer chromatography.
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Affiliation(s)
- R Brás
- Departamento de Química, Universidade da Beira Interior, R. Marquês D'Avila e Bolama, 6200, Covilha, Portugal
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