SAMAR FRESCHI DE BARROS

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Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina
LIM/19 - Laboratório de Histocompatibilidade e Imunidade Celular, Hospital das Clínicas, Faculdade de Medicina

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  • article 0 Citação(ões) na Scopus
    Distinct Microbial Communities in Dilated Cardiomyopathy Explanted Hearts Are Associated With Different Myocardial Rejection Outcomes
    (2021) PEREIRA, Jaqueline de Jesus; IKEGAMI, Renata Nishiyama; KAWAKAMI, Joyce Tiyeko; GARAVELO, Sherrira Menezes; REIS, Marcia Martins; PALOMINO, Suely Aparecida Pinheiro; MANGINI, Sandrigo; MORENO, Camila Rodrigues; BARROS, Samar Freschi de; SOUZA, Aline Rodrigues; HIGUCHI, Maria de Lourdes
    BackgroundIdiopathic dilated cardiomyopathy (IDCM) myocardial inflammation may be associated with external triggering factors such as infectious agents. Here, we searched if moderate/severe heart transplantation rejection is related to the presence of myocardial inflammation in IDCM explanted hearts, associated with microbial communities. MethodReceptor myocardial samples from 18 explanted hearts were separated into groups according to post-transplant outcome: persistent moderate rejection (PMR; n = 6), moderate rejection (MR; n = 7) that regressed after pulse therapy, and no rejection (NR; n = 5)/light intensity rejection. Inflammation was quantified through immunohistochemistry (IHC), and infectious agents were evaluated by IHC, molecular biology, in situ hybridization technique, and transmission electron microscopy (TEM). ResultsNR presented lower numbers of macrophages, as well as B cells (p = 0.0001), and higher HLA class II expression (p <= 0.0001). PMR and MR showed higher levels of Mycoplasma pneumoniae (p = 0.003) and hepatitis B core (p = 0.0009) antigens. NR presented higher levels of parvovirus B19 (PVB19) and human herpes virus 6 (HHV6) and a positive correlation between Borrelia burgdorferi (Bb) and enterovirus genes. Molecular biology demonstrated the presence of M. pneumoniae, Bb, HHV6, and PVB19 genes in all studied groups. TEM revealed structures compatible with the cited microorganisms. ConclusionsThis initial study investigating on infectious agents and inflammation in the IDCM explanted hearts showed that the association between M. pneumoniae and hepatitis B core was associated with a worse outcome after HT, represented by MR and PMR, suggesting that different IDCM microbial communities may be contributing to post-transplant myocardial rejection.
  • article 3 Citação(ões) na Scopus
    Immunological repertoire linked to PSTPIP1-associated myeloid-related inflammatory (PAMI) syndrome
    (2021) MENDONCA, Leonardo Oliveira; TERRERI, Maria Teresa; OSAKU, Fabiane Mitie; BARROS, Samar Freschi; KOHLER, Karen Francine; PRADO, Alex Isidoro; BARROS, Myrthes Toledo; KALIL, Jorge; CASTRO, Fabio Fernandes Morato
    Background Mutations along PSTPIP1 gene are associated to two specific conditions, PAPA syndrome and PAMI syndrome, both autoinflammatory disorders associated to disturbances in cytoskeleton formation. Immunological aspects of PAMI syndrome has not yet been reported neither the clinical impact on therapeutical decisions. Methods Clinical data of patients records were retrospectively accessed. Genomic DNA were extracted and sequenced following standard procedures. Peripheral lymphocytes were quantified in T, B e FOXP3 phenotypes. Results We describe two related patients with PAMI syndrome harboring the usual E250K mutation. Anti-IL1 therapy could partially control the disease in the index patient. A broad spectrum of immunological effects as well as an aberrant expression of FOXP3 could be observed. Conclusions Here we report two related brazilian patients with PAMI syndromes harboring the E250K mutation in PSTPIP1, their immunological aspects and the therapeutical response to canakinumab.
  • article 7 Citação(ões) na Scopus
    Case Report: Expanding Clinical, Immunological and Genetic Findings in Sideroblastic Anemia With Immunodeficiency, Fevers and Development Delay (SIFD) Syndrome
    (2021) MENDONCA, Leonardo Oliveira; PRADO, Alex Isidoro; COSTA, Izelda Maria Carvalho; BANDEIRA, Marcia; DYER, Rafael; BARROS, Samar Freschi; KHOLER, Karen Francine; FONSECA, Luiz Augusto Marcondes; KALIL, Jorge; CASTRO, Fabio Morato; TOLEDO-BARROS, Myrthes Anna Maragna
    Since the first description of the syndrome of sideroblastic anemia with immunodeficiency, fevers and development delay (SIFD), clinical pictures lacking both neurological and hematological manifestations have been reported. Moreover, prominent skin involvement, such as with relapsing erythema nodosum, is not a common finding. Up to this moment, no genotype and phenotype correlation could be done, but mild phenotypes seem to be located in the N or C part. B-cell deficiency is a hallmark of SIFD syndrome, and multiple others immunological defects have been reported, but not high levels of double negative T cells. Here we report a Brazilian patient with a novel phenotype of SFID syndrome, carrying multiple immune defects and harboring a novel mutation on TRNT1 gene.