FABIO EUDES LEAL
Projetos de Pesquisa
Unidades Organizacionais
8 resultados
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- Disseminated Fusarium infection in autologous stem cell transplant recipient(2015) AVELINO-SILVA, Vivian Iida; RAMOS, Jessica Fernandes; LEAL, Fabio Eudes; TESTAGROSSA, Leonardo; NOVIS, Yana SarkisDisseminated infection by Fusarium is a rare, frequently lethal condition in severely immunocompromised patients, including bone marrow transplant recipients. However, autologous bone marrow transplant recipients are not expected to be at high risk to develop fusariosis. We report a rare case of lethal disseminated Fusarium infection in an autologous bone marrow transplant recipient during pre-engraftment phase. (C) 2014 Elsevier Editora Ltda.
- Sclerosing mesenteritis as an unusual cause of fever of unknown origin: a case report and review(2012) AVELINO-SILVA, Vivian Iida; LEAL, Fabio Eudes; COELHO-NETTO, Caio; COTTI, Guilherme Cutait de Castro; SOUZA, Ricardo A. S.; AZAMBUJA, Rodrigo Lautert; ROCHA, Manoel de Souza; KALLAS, Esper Georges
- HTLV-1 Tax Specific CD8+ T Cells Express Low Levels of Tim-3 in HTLV-1 Infection: Implications for Progression to Neurological Complications(2011) NDHLOVU, Lishomwa C.; LEAL, Fabio E.; HASENKRUG, Aaron M.; JHA, Aashish R.; CARVALHO, Karina I.; ECCLES-JAMES, Ijeoma G.; BRUNO, Fernanda R.; VIEIRA, Raphaella G. S.; YORK, Vanessa A.; CHEW, Glen M.; JONES, R. Brad; TANAKA, Yuetsu; NETO, Walter K.; SANABANI, Sabri S.; OSTROWSKI, Mario A.; SEGURADO, Aluisio C.; NIXON, Douglas F.; KALLAS, Esper G.The T cell immunoglobulin mucin 3 (Tim-3) receptor is highly expressed on HIV-1-specific T cells, rendering them partially ""exhausted'' and unable to contribute to the effective immune mediated control of viral replication. To elucidate novel mechanisms contributing to the HTLV-1 neurological complex and its classic neurological presentation called HAM/TSP (HTLV-1 associated myelopathy/tropical spastic paraparesis), we investigated the expression of the Tim-3 receptor on CD8(+) T cells from a cohort of HTLV-1 seropositive asymptomatic and symptomatic patients. Patients diagnosed with HAM/TSP down-regulated Tim-3 expression on both CD8(+) and CD4(+) T cells compared to asymptomatic patients and HTLV-1 seronegative controls. HTLV-1 Tax-specific, HLA-A*02 restricted CD8(+) T cells among HAM/TSP individuals expressed markedly lower levels of Tim-3. We observed Tax expressing cells in both Tim-3(+) and Tim-3(-) fractions. Taken together, these data indicate that there is a systematic downregulation of Tim-3 levels on T cells in HTLV-1 infection, sustaining a profoundly highly active population of potentially pathogenic T cells that may allow for the development of HTLV-1 complications.
- Lack of evidence to support the association of a single IL28B genotype SNP rs12979860 with the HTLV-1 clinical outcomes and proviral load(2012) SANABANI, Sabri Saeed; NUKUI, Youko; PEREIRA, Juliana; COSTA, Antonio Charlys da; OLIVEIRA, Ana Carolina Soares de; PESSOA, Rodrigo; LEAL, Fabio Eudes; SEGURADO, Aluisio C.; KALLAS, Esper Georges; SABINO, Ester CerdeiraBackground: The Interleukin 28B (IL28B) rs12979860 polymorphisms was recently reported to be associated with the human T-cell leukemia virus type 1 (HTLV-1) proviral load (PvL) and the development of the HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). Methods: In an attempt to examine this hypothesis, we assessed the association of the rs12979860 genotypes with HTLV-1 PvL levels and clinical status in 112 unrelated Brazilian subjects (81 HTLV-1 asymptomatic carriers, 24 individuals with HAM/TSP and 7 with Adult T cell Leukemia/Lymphoma (ATLL)). Results: All 112 samples were successfully genotyped and their PvLs compared. Neither the homozygote TT nor the heterozygote CT mutations nor the combination genotypes (TT/CT) were associated with a greater PvL. We also observed no significant difference in allele distribution between asymptomatic carriers and patients with HTLV-1 associated HAM/TSP. Conclusions: Our study failed to support the previously reported positive association between the IL28B rs12979860 polymorphisms and an increased risk of developing HAM/TSP in the Brazilian population.
- Yellow fever vaccine viremia following ablative BM suppression in AML(2012) AVELINO-SILVA, V. I.; LEAL, F. E.; SABINO, E. C.; NISHIYA, A. S.; FREIRE, M. da Silva; BLUMM, F.; ROCHA, V.; RODRIGUES, C. A.; NOVIS, Y. S.; KALLAS, E. G.
- Clinical features and natural history of the first 2073 suspected COVID-19 cases in the Corona Sao Caetano primary care programme: a prospective cohort study(2021) LEAL, Fabio E.; MENDES-CORREA, Maria C.; BUSS, Lewis Fletcher; COSTA, Silvia F.; BIZARIO, Joao C. S.; SOUZA, Sonia R. P. de; THOMAZ, Osorio; TOZETTO-MENDOZA, Tania Regina; VILLAS-BOAS, Lucy S.; SILVA, Lea Campos de Oliveira-da; GRESPAN, Regina M. Z.; CAPUANI, Ligia; BUCCHERI, Renata; DOMINGUES, Helves; ALEXANDER, Neal; MAYAUD, Philippe; SABINO, Ester CerdeiraBackground Despite most cases not requiring hospital care, there are limited community-based clinical data on COVID-19. Methods The Corona Sao Caetano programme is a primary care initiative providing care to all residents with COVID-19 in Sao Caetano do Sul, Brazil. It was designed to capture standardised clinical data on community COVID-19 cases. After triage of potentially severe cases, consecutive patients presenting to a multimedia screening platform between 13 April and 13 May 2020 were tested at home with SARS-CoV-2 reverse transcriptase (RT) PCR; positive patients were followed up for 14 days with phone calls every 2 days. RT-PCR-negative patients were offered additional SARS-CoV-2 serology testing to establish their infection status. We describe the clinical, virological and natural history features of this prospective population-based cohort. Findings Of 2073 suspected COVID-19 cases, 1583 (76.4%) were tested by RT-PCR, of whom 444 (28.0%, 95% CI 25.9 to 30.3) were positive; 604/1136 (53%) RT-PCR-negative patients underwent serology, of whom 52 (8.6%) tested SARS-CoV-2 seropositive. The most common symptoms of confirmed COVID-19 were cough, fatigue, myalgia and headache; whereas self-reported fever (OR 3.0, 95% CI 2.4 to 3.9), anosmia (OR 3.3, 95% CI 2.6 to 4.4) and ageusia (OR 2.9, 95% CI 2.3 to 3.8) were most strongly associated with a positive COVID-19 diagnosis by RT-PCR or serology. RT-PCR cycle thresholds were lower in men, older patients, those with fever and arthralgia and closer to symptom onset. The rates of hospitalisation and death among 444 RT-PCR-positive cases were 6.7% and 0.7%, respectively, with older age and obesity more frequent in the hospitalised group. Conclusion COVID-19 presents in a similar way to other mild community-acquired respiratory diseases, but the presence of fever, anosmia and ageusia can assist the specific diagnosis. Most patients recovered without requiring hospitalisation with a low fatality rate compared with other hospital-based studies.
bookPart Infeccão no Paciente Imunodeprimido Neutropenia Febril(2014) LEAL, Fabio Eudes; AVELINO-SILVA, Vivian Iida; KALLAS, Esper Georges- Expansion in CD39(+) CD4(+) Immunoregulatory T Cells and Rarity of Th17 Cells in HTLV-1 Infected Patients Is Associated with Neurological Complications(2013) LEAL, Fabio E.; NDHLOVU, Lishomwa C.; HASENKRUG, Aaron M.; BRUNO, Fernanda R.; CARVALHO, Karina I.; WYNN-WILLIAMS, Harry; NETO, Walter K.; SANABANI, Sabri S.; SEGURADO, Aluisio C.; NIXON, Douglas F.; KALLAS, Esper G.HTLV-1 infection is associated with several inflammatory disorders, including the neurodegenerative condition HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). It is unclear why a minority of infected subjects develops HAM/TSP. CD4(+) T cells are the main target of infection and play a pivotal role in regulating immunity to HTLV and are hypothesized to participate in the pathogenesis of HAM/TSP. The CD39 ectonucleotidase receptor is expressed on CD4(+) T cells and based on co-expression with CD25, marks T cells with distinct regulatory (CD39(+)CD25(+)) and effector (CD39(+)CD25(-)) function. Here, we investigated the expression of CD39 on CD4(+) T cells from a cohort of HAM/TSP patients, HTLV-1 asymptomatic carriers (AC), and matched uninfected controls. The frequency of CD39(+)CD4(+) T cells was increased in HTLV-1 infected patients, regardless of clinical status. More importantly, the proportion of the immunostimulatory CD39(+)CD25(-) CD4+ T-cell subset was significantly elevated in HAM/TSP patients as compared to AC and phenotypically had lower levels of the immunoinhibitory receptor, PD-1. We saw no difference in the frequency of CD39(+)CD25(+) regulatory (Treg) cells between AC and HAM/TSP patients. However, these cells transition from being anergic to displaying a polyfunctional cytokine response following HTLV-1 infection. CD39(-)CD25(+) T cell subsets predominantly secreted the inflammatory cytokine IL-17. We found that HAM/TSP patients had significantly fewer numbers of IL-17 secreting CD4(+) T cells compared to uninfected controls. Taken together, we show that the expression of CD39 is upregulated on CD4(+) T cells HAM/TSP patients. This upregulation may play a role in the development of the proinflammatory milieu through pathways both distinct and separate among the different CD39 T cell subsets. CD39 upregulation may therefore serve as a surrogate diagnostic marker of progression and could potentially be a target for interventions to reduce the development of HAM/TSP.