LUCY SANTOS VILAS BOAS
Projetos de Pesquisa
Unidades Organizacionais
LIM/52 - Laboratório de Virologia, Hospital das Clínicas, Faculdade de Medicina
4 resultados
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- Respiratory viruses and postoperative hemodynamics in patients with unrestrictive congenital cardiac communications: a prospective cohort study(2023) ABUD, Kelly C. O.; MACHADO, Clarisse M.; BOAS, Lucy S. Vilas S.; MAEDA, Nair Y.; CARVALHO, Eloisa S.; SOUZA, Maria Francilene S.; GAIOLLA, Paula V.; CASTRO, Claudia R. P.; PEREIRA, Juliana; RABINOVITCH, Marlene; LOPES, Antonio AugustoBackgroundPulmonary vascular abnormalities pose a risk for severe life-threatening hemodynamic disturbances following surgical repair of congenital cardiac communications (CCCs). In the distal lung, small airways and vessels share a common microenvironment, where biological crosstalks take place. Because respiratory cells infected by viruses express a number of molecules with potential impact on airway and vascular remodeling, we decided to test the hypothesis that CCC patients carrying viral genomes in the airways might be at a higher risk for pulmonary (and systemic) hemodynamic disturbances postoperatively.MethodsSixty patients were prospectively enrolled (age 11 [7-16] months, median with interquartile range). Preoperative pulmonary/systemic mean arterial pressure ratio (PAP/SAP) was 0.78 (0.63-0.88). The presence or absence of genetic material for respiratory viruses in nasopharyngeal and tracheal aspirates was investigated preoperatively in the absence of respiratory symptoms using real-time polymerase chain reaction (kit for detection of 19 pathogens). Post-cardiopulmonary bypass (CPB) inflammatory reaction was analyzed by measuring serum levels of 36 inflammatory proteins (immunoblotting) 4 h after its termination. Postoperative hemodynamics was assessed using continuous recording of PAP and SAP with calculation of PAP/SAP ratio.ResultsViral genomes were detected in nasopharynx and the trachea in 64% and 38% of patients, respectively. Rhinovirus was the most prevalent agent. The presence of viral genomes in the trachea was associated with an upward shift of postoperative PAP curve (p = 0.011) with a PAP/SAP of 0.44 (0.36-0.50) in patients who were positive versus 0.34 (0.30-0.45) in those who were negative (p = 0.008). The presence or absence of viral genomes in nasopharynx did not help predict postoperative hemodynamics. Postoperative PAP/SAP was positively correlated with post-CPB levels of interleukin-1 receptor antagonist (p = 0.026), macrophage migration inhibitory factor (p = 0.019) and monocyte chemoattractant protein-1 (p = 0.031), particularly in patients with virus-positive tracheal aspirates.ConclusionsPatients with CCCs carrying respiratory viral genomes in lower airways are at a higher risk for postoperative pulmonary hypertension, thus deserving special attention and care. Preoperative exposure to respiratory viruses and post-CPB inflammatory reaction seem to play a combined role in determining the postoperative behavior of the pulmonary circulation.
- Detailed characterization of Redondovirus in saliva of SARS-CoV-2-infected individuals in Sao Paulo, Brazil(2023) COSTA, Antonio Charlys da; MENDES-CORREA, Maria C.; TOZETTO-MENDOZA, Tania Regina; VILLAS-BOAS, Lucy S.; PAULA, Anderson Vicente de; PAIAO, Heuder Gustavo Oliveira; LEAL, Fabio E.; FERREIRA, Noely E.; HONORATO, Layla; LEAL, Elcio; GRANDI, Giuliano; MORAIS, Vanessa dos Santos; MANULI, Erika R.; SABINO, Ester C.; WITKIN, Steven S.BackgroundRedondovirus (ReDoV) is a DNA virus present in the respiratory tract of many healthy individuals. Since SARS-CoV-2, the virus responsible for COVID-19, also primarily infects the same site, we evaluated whether ReDoV was present at increased frequency in patients with COVID-19 and influenced infection parameters.MethodsSaliva samples were collected weekly from 59 individuals with COVID-19 and from 132 controls. ReDoV was detected by polymerase chain reaction and the genotypes were identified by metagenomics. Torque Teno Virus (TTV) in these samples were previously reported.ResultsReDoV was detected in saliva more frequently from COVID-19 patients (72.9%) than from controls (50.0%) (p = 0.0015). There were no associations between ReDoV detection and either continuous or intermittent SARS-CoV-2 shedding, the duration of SARS-CoV-2 detection in saliva, patients' sex or if infection was by the B1 or Gamma strain. The two ReDoV strains, Brisavirus and Vientovirus, were present in equivalent frequencies in ReDoV-positive COVID-19 patients and controls. Phylogenetic analysis suggested that the two ReDoV strains in Brazil were similar to strains previously detected on other continents.ConclusionReDoV expression in saliva is increased in males and females in Brazil with mild COVID-19 but its presence does not appear to influence properties of the SARS-CoV-2 infection.
- SARS-CoV-2 Detection and Culture in Different Biological Specimens from Immunocompetent and Immunosuppressed COVID-19 Patients Infected with Two Different Viral Strains(2023) MENDES-CORREA, Maria Cassia; SALOMAO, Matias Chiarastelli; GHILARDI, Fabio; TOZETTO-MENDOZA, Tania Regina; VILLAS-BOAS, Lucy Santos; PAULA, Anderson Vicente de; PAIAO, Heuder Gustavo Oliveira; COSTA, Antonio Charlys da; LEAL, Fabio E.; FERRAZ, Andrea de Barros Coscelli; SALES, Flavia C. S.; CLARO, Ingra M.; FERREIRA, Noely E.; PEREIRA, Geovana M.; JR, Almir Ribeiro da Silva; FREIRE, Wilton; ESPINOZA, Evelyn Patricia Sanchez; MANULI, Erika R.; ROMANO, Camila M.; JESUS, Jaqueline G. de; SABINO, Ester C.; WITKIN, Steven S.Introduction-The dynamics of SARS-CoV-2 shedding and replication in humans remain incompletely understood. Methods-We analyzed SARS-CoV-2 shedding from multiple sites in individuals with an acute COVID-19 infection by weekly sampling for five weeks in 98 immunocompetent and 25 immunosuppressed individuals. Samples and culture supernatants were tested via RT-PCR for SARS-CoV-2 to determine viral clearance rates and in vitro replication. Results-A total of 2447 clinical specimens were evaluated, including 557 nasopharyngeal swabs, 527 saliva samples, 464 urine specimens, 437 anal swabs and 462 blood samples. The SARS-CoV-2 genome sequences at each site were classified as belonging to the B.1.128 (ancestral strain) or Gamma lineage. SARS-CoV-2 detection was highest in nasopharyngeal swabs regardless of the virus strain involved or the immune status of infected individuals. The duration of viral shedding varied between clinical specimens and individual patients. Prolonged shedding of potentially infectious virus varied from 10 days up to 191 days, and primarily occurred in immunosuppressed individuals. Virus was isolated in culture from 18 nasal swab or saliva samples collected 10 or more days after onset of disease. Conclusions-Our findings indicate that persistent SARS-CoV-2 shedding may occur in both competent or immunosuppressed individuals, at multiple clinical sites and in a minority of subjects is capable of in vitro replication.
- Intranasal Liposomal Formulation of Spike Protein Adjuvanted with CpG Protects and Boosts Heterologous Immunity of hACE2 Transgenic Mice to SARS-CoV-2 Infection(2023) RUSSO, Momtchilo; MENDES-CORREA, Maria Cassia; LINS, Bruna B.; KERSTEN, Victor; PERNAMBUCO, Paulo C. A.; MARTINS, Toni Ricardo; TOZETTO-MENDOZA, Tania Regina; BOAS, Lucy Santos Vilas; GOMES, Brisa Moreira; DATI, Livia Mendonca Munhoz; DUARTE-NETO, Amaro Nunes; REIGADO, Gustavo Roncoli; FREDERICO, Ana Beatriz T.; CUNHA, Danielle R. de A.; PAULA, Anderson Vicente de; SILVA, Jose Igor G. da; VASCONCELOS, Carlos F. Moreira; CHAMBERGO, Felipe S.; NUNES, Viviane Abreu; BOM, Ana Paula Dinis Ano; CASTILHO, Leda R.; MARTINS, Rodrigo A. P.; HIRATA, Mario Hiroyuki; MIROTTI, Luciana; TRIPP, Ralph A.Mucosal vaccination appears to be suitable to protect against SARS-CoV-2 infection. In this study, we tested an intranasal mucosal vaccine candidate for COVID-19 that consisted of a cationic liposome containing a trimeric SARS-CoV-2 spike protein and CpG-ODNs, a Toll-like receptor 9 agonist, as an adjuvant. In vitro and in vivo experiments indicated the absence of toxicity following the intranasal administration of this vaccine formulation. First, we found that subcutaneous or intranasal vaccination protected hACE-2 transgenic mice from infection with the wild-type (Wuhan) SARS-CoV-2 strain, as shown by weight loss and mortality indicators. However, when compared with subcutaneous administration, the intranasal route was more effective in the pulmonary clearance of the virus and induced higher neutralizing antibodies and anti-S IgA titers. In addition, the intranasal vaccination afforded protection against gamma, delta, and omicron virus variants of concern. Furthermore, the intranasal vaccine formulation was superior to intramuscular vaccination with a recombinant, replication-deficient chimpanzee adenovirus vector encoding the SARS-CoV-2 spike glycoprotein (Oxford/AstraZeneca) in terms of virus lung clearance and production of neutralizing antibodies in serum and bronchial alveolar lavage (BAL). Finally, the intranasal liposomal formulation boosted heterologous immunity induced by previous intramuscular vaccination with the Oxford/AstraZeneca vaccine, which was more robust than homologous immunity.