KEITY SOUZA SANTOS
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Clínica Médica, Faculdade de Medicina - Docente
LIM/19 - Laboratório de Histocompatibilidade e Imunidade Celular, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/19 - Laboratório de Histocompatibilidade e Imunidade Celular, Hospital das Clínicas, Faculdade de Medicina - Líder
24 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 24
conferenceObject Immune Responses Of CVID Patients To COVID-19 Vaccines(2023) MEDEIROS, Giuliana Xavier de; FERREIRA, Loisi de Carvalho Pereira; MAGAWA, Jhosiene Yukari; KURAMOTO, Andreia; SASAHARA, Greyce Luri; FERREIRA, Marcelo; BARROS, Myrthes Maragna Toledo; KALIL, Jorge; MARINHO, Ana Karolina Barreto Berselli; CUNHA-NETO, Edecio; SANTOS, Keity Souza; KOKRON, Cristina- IgE and IgG4 Epitopes of Dermatophagoides and Blomia Allergens before and after Sublingual Immunotherapy(2023) FIGO, Daniele Danella; MACEDO, Priscilla Rios Cordeiro; GADERMAIER, Gabriele; REMUZGO, Cesar; CASTRO, Fabio Fernandes Morato; KALIL, Jorge; GALVAO, Clovis Eduardo Santos; SANTOS, Keity SouzaSublingual immunotherapy (SLIT) is used worldwide to treat house dust mites (HDM) allergy. Epitope specific immunotherapy with peptide vaccines is used far less, but it is of great interest in the treatment of allergic reactions, as it precludes the drawbacks of allergen extracts. The ideal peptide candidates would bind to IgG, blocking IgE-binding. To better elucidate IgE and IgG4 epitope profiles during SLIT, sequences of main allergens, Der p 1, 2, 5, 7, 10, 23 and Blo t 5, 6, 12, 13, were included in a 15-mer peptide microarray and tested against pooled sera from 10 patients pre- and post-1-year SLIT. All allergens were recognized to some extent by at least one antibody isotype and peptide diversity was higher post-1-year SLIT for both antibodies. IgE recognition diversity varied among allergens and timepoints without a clear tendency. Der p 10, a minor allergen in temperate regions, was the molecule with more IgE-peptides and might be a major allergen in populations highly exposed to helminths and cockroaches, such as Brazil. SLIT-induced IgG4 epitopes were directed against several, but not all, IgE-binding regions. We selected a set of peptides that recognized only IgG4 or were able to induce increased ratios of IgG4:IgE after one year of treatment and might be potential targets for vaccines.
bookPart Medicina de precisão em alergia(2022) SANTOS, Keity Souza; LIMA, Karine de Amicis; CASTRO, Fábio Fernandes Morato; KALIL, Jorge- Is age associated with the development of antibodies against botulinum toxin?(2013) AUN, M. V.; CHUNG, T. M.; SANTOS, K. S.; BATTISTELLA, L. M. R.; RIZZO, L. V.; KALIL, J.; GIAVINA-BIANCHI, P.
- Novel allergens from ancient foods: Man e 5 from manioc (Manihot esculenta Crantz) cross reacts with Hev b 5 from latex(2013) SANTOS, Keity Souza; GADERMAIER, Gabriele; VEJVAR, Eva; ARCURI, Helen Andrade; GALVAO, Clovis Eduardo; YANG, Ariana Campos; RESENDE, Virginia Maria Ferreira; MARTINS, Carlo de Oliveira; HIMLY, Martin; MARI, Adriano; LISO, Marina; POMPONI, Debora; BREITENEDER, Heimo; WAGNER, Stefan; KALIL, Jorge; FERREIRA, Fatima; CASTRO, Fabio Fernandes MoratoScope Manioc (Manihot esculenta) is a tuber mainly consumed in the Southern Hemisphere and used worldwide by food and chemistry industry. We aimed to recombinantly produce and characterize the first manioc allergen and evaluate its IgE reactivity in sera of Brazilian and Italian patients. Methods and results The molecule, termed Man e5, was expressed in E. coli, characterized by amino acid analysis, mass spectrometry, circular dichroism, HPLC, and dynamic light scattering. A tertiary structural model of the protein was produced using bioinformatics and susceptibility to pepsin digestion was analyzed in vitro. Based on its high content of charged residues, heat stability, flexibility and lack of secondary structure elements, the allergen was determined a member of the intrinsically disordered protein family. Brazilian patients were selected based on manioc allergy and Italians based on latex allergy and sensitization to Hev b 5.71% of Brazilians and 40% of Italians were in vitro IgE positive to Man e5. Cross-inhibition assays suggest a possible involvement of this allergen in the latex-fruit syndrome. Conclusion Man e5, the first purified allergen from manioc demonstrates IgE cross-reactivity with Hev b 5. Data suggest Hev b 5 might act as primary sensitizer and could therefore lead to allergic manifestations upon manioc consumption without prior exposition.
- Immunodominant antibody responses directed to SARS-CoV-2 hotspot mutation sites and risk of immune escape(2023) OLIVEIRA, Jamille Ramos; RUIZ, Cesar Manuel Remuzgo; MACHADO, Rafael Rahal Guaragna; MAGAWA, Jhosiene Yukari; DAHER, Isabela Pazotti; URBANSKI, Alysson Henrique; SCHMITZ, Gabriela Justamante Haendel; ARCURI, Helen Andrade; FERREIRA, Marcelo Alves; SASAHARA, Greyce Luri; MEDEIROS, Giuliana Xavier de; JR, Roberto Carlos Vieira Silva; DURIGON, Edison Luiz; BOSCARDIN, Silvia Beatriz; ROSA, Daniela Santoro; SCHECHTMAN, Deborah; NAKAYA, Helder. I. I.; CUNHA-NETO, Edecio; GADERMAIER, Gabriele; KALIL, Jorge; COELHO, Veronica; SANTOS, Keity SouzaIntroductionConsidering the likely need for the development of novel effective vaccines adapted to emerging relevant CoV-2 variants, the increasing knowledge of epitope recognition profile among convalescents and afterwards vaccinated with identification of immunodominant regions may provide important information. MethodsWe used an RBD peptide microarray to identify IgG and IgA binding regions in serum of 71 COVID-19 convalescents and 18 vaccinated individuals. ResultsWe found a set of immunodominant RBD antibody epitopes, each recognized by more than 30% of the tested cohort, that differ among the two different groups and are within conserved regions among betacoronavirus. Of those, only one peptide, P44 (S415-429), recognized by 68% of convalescents, presented IgG and IgA antibody reactivity that positively correlated with nAb titers, suggesting that this is a relevant RBD region and a potential target of IgG/IgA neutralizing activity. DiscussionThis peptide is localized within the area of contact with ACE-2 and harbors the mutation hotspot site K417 present in gamma (K417T), beta (K417N), and omicron (K417N) variants of concern. The epitope profile of vaccinated individuals differed from convalescents, with a more diverse repertoire of immunodominant peptides, recognized by more than 30% of the cohort. Noteworthy, immunodominant regions of recognition by vaccinated coincide with mutation sites at Omicron BA.1, an important variant emerging after massive vaccination. Together, our data show that immune pressure induced by dominant antibody responses may favor hotspot mutation sites and the selection of variants capable of evading humoral response.
- Follow-up of young adult monozygotic twins after simultaneous critical coronavirus disease 2019: a case report (vol 9, 1008585, 2022)(2023) CASTRO, Mateus V. de; SILVA, Monize V. R.; SOARES, Flavia B.; CORIA, Vivian R.; NASLAVSKY, Michel S.; SCLIAR, Marilia O.; CASTELLI, Erick C.; OLIVEIRA, Jamile R. de; MEDEIROS, Giuliana X. de; SASAHARA, Greyce L.; SANTOS, Keity S.; CUNHA-NETO, Edecio; KALIL, Jorge; ZATZ, Mayana
- Follow-up of young adult monozygotic twins after simultaneous critical coronavirus disease 2019: A case report(2022) V, Mateus de Castro; SILVA, Monize V. R.; SOARES, Flavia B.; CORIA, Vivian R.; NASLAVSKY, Michel S.; SCLIAR, Marilia O.; CASTELLI, Erick C.; OLIVEIRA, Jamile R. de; SASAHARA, Greyce L.; SANTOS, Keity S.; CUNHA-NETO, Edecio; KALIL, Jorge; ZATZ, MayanaBackgroundThe influence of the host genome on coronavirus disease 2019 (COVID-19) susceptibility and severity is supported by reports on monozygotic (MZ) twins where both were infected simultaneously with similar disease outcomes, including several who died due to the SARS-CoV-2 infection within days apart. However, successive exposures to pathogens throughout life along with other environmental factors make the immune response unique for each individual, even among MZ twins. Case presentation and methodsHere we report a case of a young adult monozygotic twin pair, who caught attention since both presented simultaneously severe COVID-19 with the need for oxygen support despite age and good health conditions. One of the twins, who spent more time hospitalized, reported symptoms of long-COVID even 7 months after infection. Immune cell profile and specific responses to SARS-CoV-2 were evaluated as well as whole exome sequencing. ConclusionAlthough the MZ twin brothers shared the same genetic mutations which may be associated with their increased risk of developing severe COVID-19, their clinical progression was different, reinforcing the role of both immune response and genetics in the COVID-19 presentation and course. Besides, post-COVID syndrome was observed in one of them, corroborating an association between the duration of hospitalization and the occurrence of long-COVID symptoms.
- MUC22, HLA-A, and HLA-DOB variants and COVID-19 in resilient super-agers from Brazil(2022) CASTELLI, Erick C.; CASTRO, Mateus V. de; NASLAVSKY, Michel S.; SCLIAR, Marilia O.; SILVA, Nayane S. B.; PEREIRA, Raphaela N.; CIRIACO, Viviane A. O.; CASTRO, Camila F. B.; MENDES-JUNIOR, Celso T.; SILVEIRA, Etiele de S.; OLIVEIRA, Iuri M. de; ANTONIO, Eduardo C.; VIEIRA, Gustavo F.; MEYER, Diogo; NUNES, Kelly; MATOS, Larissa R. B.; SILVA, Monize V. R.; WANG, Jaqueline Y. T.; ESPOSITO, Joyce; CORIA, Vivian R.; MAGAWA, Jhosiene Y.; SANTOS, Keity S.; CUNHA-NETO, Edecio; KALIL, Jorge; BORTOLIN, Raul H.; HIRATA, Mario Hiroyuki; DELL'AQUILA, Luiz P.; RAZUK-FILHO, Alvaro; BATISTA-JUNIOR, Pedro B.; DUARTE-NETO, Amaro N.; DOLHNIKOFF, Marisa; SALDIVA, Paulo H. N.; PASSOS-BUENO, Maria Rita; ZATZ, MayanaBackgroundAlthough aging correlates with a worse prognosis for Covid-19, super elderly still unvaccinated individuals presenting mild or no symptoms have been reported worldwide. Most of the reported genetic variants responsible for increased disease susceptibility are associated with immune response, involving type I IFN immunity and modulation; HLA cluster genes; inflammasome activation; genes of interleukins; and chemokines receptors. On the other hand, little is known about the resistance mechanisms against SARS-CoV-2 infection. Here, we addressed polymorphisms in the MHC region associated with Covid-19 outcome in super elderly resilient patients as compared to younger patients with a severe outcome. MethodsSARS-CoV-2 infection was confirmed by RT-PCR test. Aiming to identify candidate genes associated with host resistance, we investigated 87 individuals older than 90 years who recovered from Covid-19 with mild symptoms or who remained asymptomatic following positive test for SARS-CoV-2 as compared to 55 individuals younger than 60 years who had a severe disease or died due to Covid-19, as well as to the general elderly population from the same city. Whole-exome sequencing and an in-depth analysis of the MHC region was performed. All samples were collected in early 2020 and before the local vaccination programs started. ResultsWe found that the resilient super elderly group displayed a higher frequency of some missense variants in the MUC22 gene (a member of the mucins' family) as one of the strongest signals in the MHC region as compared to the severe Covid-19 group and the general elderly control population. For example, the missense variant rs62399430 at MUC22 is two times more frequent among the resilient super elderly (p = 0.00002, OR = 2.24). ConclusionSince the pro-inflammatory basal state in the elderly may enhance the susceptibility to severe Covid-19, we hypothesized that MUC22 might play an important protective role against severe Covid-19, by reducing overactive immune responses in the senior population.
- Cashew Tree Pollen: An Unknown Source of IgE-Reactive Molecules(2019) FIGO, Daniele Danella; AMICIS, Karine De; AQUINO, Denise Neiva Santos de; POMIECINSKI, Fabiane; GADERMAIER, Gabriele; BRIZA, Peter; GALVAO, Clovis Eduardo Santos; AMARAL, Jonatas Bussador do; MARTINS, Carlo de Oliveira; CASTRO, Fabio Fernandes Morato; KALIL, Jorge; SANTOS, Keity SouzaPollinosis is sub-diagnosed and rarely studied in tropical countries. Cashew tree pollen has been reported as an allergen source although the knowledge of its immunoglobulin E (IgE)-reactive molecules is lacking. Therefore, this work aimed to identify IgE-reactive molecules and provide a proteomic profile of this pollen. From the 830 proteins identified by shotgun analysis, 163 were annotated to gene ontology, and a list of 39 proteins filtered for high confidence was submitted to the Allfam database where nine were assigned to allergenic families. Thus, 12 patients from the northeast of Brazil with persistent allergic rhinitis and aggravation of symptoms during cashew flowering season were selected. Using a 2D-based approach, we identified 20 IgE-reactive proteins, four already recognized as allergens, including a homolog of the birch isoflavone-reductase (Bet v 6). IgE-reactivity against the extract in native form was confirmed for five patients in ELISA, with three being positive for Bet v 6. Herein, we present a group of patients with rhinitis exposed to cashew tree pollen with the first description of IgE-binding proteins and a proteomic profile of the whole pollen. Cashew tree pollen is considered an important trigger of rhinitis symptoms in clinical practice in the northeast of Brazil, and the elucidation of its allergenic molecules can improve the diagnostics and treatment for allergic patients.
- «
- 1 (current)
- 2
- 3
- »