MIRIAN NACAGAMI SOTTO
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Patologia, Faculdade de Medicina - Docente
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
107 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 107
- Immunology of leprosy(2022) FROES JR., Luis Alberto Ribeiro; TRINDADE, Maria Angela Bianconcini; SOTTO, Mirian NacagamiLeprosy is a disease caused by Mycobacterium leprae (ML) with diverse clinical manifestations, which are strongly correlated with the host's immune response. Skin lesions may be accompanied by peripheral neural damage, leading to sensory and motor losses, as well as deformities of the hands and feet. Both innate and acquired immune responses are involved, but the disease has been classically described along a Th1/Th2 spectrum, where the Th1 pole corresponds to the most limited presentations and the Th2 to the most disseminated ones. We discuss this dichotomy in the light of current knowledge of cytokines, Th subpopulations and regulatory T cells taking part in each leprosy presentation. Leprosy reactions are associated with an increase in inflammatory activity both in limited and disseminated presentations, leading to a worsening of previous symptoms or the development of new symptoms. Despite the efforts of many research groups around the world, there is still no adequate serological test for diagnosis in endemic areas, hindering the eradication of leprosy in these regions.
- Mutational signatures and increased retrotransposon insertions in xeroderma pigmentosum variant skin tumors(2023) CORRADI, Camila; VILAR, Juliana B.; BUZATTO, Vanessa C.; SOUZA, Tiago A. de; CASTRO, Ligia P.; MUNFORD, Veridiana; VECCHI, Rodrigo De; GALANTE, Pedro A. F.; ORPINELLI, Fernanda; MILLER, Thiago L. A.; BUZZO, Jose L.; SOTTO, Mirian N.; SALDIVA, Paulo; OLIVEIRA, Jocelanio W. de; CHAIBUB, Sulamita C. W.; SARASIN, Alain; MENCK, Carlos F. M.This manuscript describes the genetic alterations found in the skin tumors of XP-V patients deficient in translesion synthesis. The alterations include mutation signatures and retrotransposition insertions, which provide mechanistic information about DNA polymerase eta functions. Xeroderma pigmentosum variant (XP-V) is an autosomal recessive disease with an increased risk of developing cutaneous neoplasms in sunlight-exposed regions. These cells are deficient in the translesion synthesis (TLS) DNA polymerase eta, responsible for bypassing different types of DNA lesions. From the exome sequencing of 11 skin tumors of a genetic XP-V patients' cluster, classical mutational signatures related to sunlight exposure, such as C>T transitions targeted to pyrimidine dimers, were identified. However, basal cell carcinomas also showed distinct C>A mutation spectra reflecting a mutational signature possibly related to sunlight-induced oxidative stress. Moreover, four samples carry different mutational signatures, with C>A mutations associated with tobacco chewing or smoking usage. Thus, XP-V patients should be warned of the risk of these habits. Surprisingly, higher levels of retrotransposon somatic insertions were also detected when the tumors were compared with non-XP skin tumors, revealing other possible causes for XP-V tumors and novel functions for the TLS polymerase eta in suppressing retrotransposition. Finally, the expected high mutation burden found in most of these tumors renders these XP patients good candidates for checkpoint blockade immunotherapy.
- Leprosy As a Complex infection: Breakdown of the Th1 and Th2 immune Paradigm in the immunopathogenesis of the Disease(2017) SOUSA, Jorge Rodrigues de; SOTTO, Mirian Nacagami; QUARESMA, Juarez Antonio SimoesLeprosy is a chronic infectious disease whose evolution involves complex immune mechanisms of the host that influence the clinical presentation of the disease. For many years, the main interpretation of the host defense response was based on characterization of the established immune paradigm between T helper (Th) 1 and Th2 lymphocytes. However, with advances in the knowledge of immunology, new approaches have emerged along with the development of new immunological pathways that have changed the interpretation of the long-established paradigm of the polar forms of the disease, especially with the identification of new subtypes of T lymphocytes such as Th9, Th17, Th22, and Tregs. Thus, this review discusses the role of these new subtypes of T helper lymphocytes and how the development of the immune response of these cells modifies the pattern of the Th1/Th2 response in the immunopathogenesis of leprosy.
- Amantadine-Induced Livedo Racemosa(2016) CRIADO, Paulo Ricardo; ALAVI, Afsaneh; VALENTE, Neusa Yuriko Sakai; SOTTO, Mirian NacagamiAlthough livedo reticularis is a known adverse effect of amantadine, only limited studies have addressed this association. Livedo racemosa in contrast to livedo reticularis is characterized by a striking violaceous netlike pattern of the skin similar to livedo reticularis with a different histopathology and morphology (irregular, broken circular segments). In this case report, we present 2 cases of livedo racemosa and edema of lower extremities following amantadine treatment. The cutaneous biopsies in both cases showed intraluminal thrombi in subcutaneous blood vessels without evidence of vasculitis, which is consistent with livedo racemosa.
- Lacaziosis: immunohistochemical evaluation of elements of the humoral response in cutaneous lesions(2020) KANASHIRO-GALO, Luciane; ALEXANDRE, Ariane Fernandes; TAFURI, Wagner Luiz; BARBOZA, Tania Cristina; QUARESMA, Juarez Antonio Simoes; BRITO, Arival Cardoso de; NASCIMENTO, Gabriela Yasmin Francisca da Silva do; SANTOS FILHO, Antonio Marques dos; SOTTO, Mirian Nacagami; PAGLIARI, CarlaLacaziosis is a cutaneous mycosis caused by the fungus Lacazia loboi, described in different countries of Latin America and prevalent in the Amazon region. The ineffective immune response against the agent seems to be related to a Th2 pattern of cytokines. There are few reports exploring elements of the humoral response in these lesions. Our aim was to investigate some elements focusing on 13 cells, plasma cells and local expression of IgG and IgM antibodies. Forty skin biopsies of lower limbs were selected. The diagnosis of lacaziosis was based on direct mycological examination and histological analysis. The visualization of fungal cells was improved by using Gridley's staining. An immunohistochemical protocol was performed to detect the expression of B cells, plasma cells. IgG and IgM. A double staining was performed to explore the presence of yeasts in the cytoplasm of keratinocytes, using an anti-AE1 AE3 antibody over Gridley's staining. The inflammatory infiltrate consisted of macrophages, multinucleated giant cells, lymphocytes, and fibrosis. Fungal cells were frequent in the stratum corneum and in both, the dermis and, in 50% of the specimens, also in the epidermis. Cells expressing IgG were more abundant when compared to cells expressing IgM. B cells and the presence of IgG might indicate that the humoral response promotes a Th2 immune response resulting in an anti-inflammatory phenotype. Our results lead us to suggest a possible role of B cells and immunoglobulins in the mechanisms of lacaziosis pathogenesis.
- Inter- and intra-patient heterogeneity of PD-L1 expression in metastatic melanomas: A retrospective study(2021) GIAVINA-BIANCHI, Mara; SOTTO, Mirian Nacagamo; GIAVINA-BIANCHI, Pedro; MUNHOZ, Rodrigo; NETO, Cyro Festa; KALIL, Jorge
- Evidence for lymphocytic inflammation in non-lesional scalp of folliculitis decalvans: an observational study of 25 patients(2022) DOCHE, I.; HORDINSKY, M. K.; VALENTE, N. S.; SOTTO, M. N.; MIOTTO, I.; REBEIS, M.; RIVITTI-MACHADO, M. C.
- Unilateral Livedoid Vasculopathy Associated With Involutional Phase of Cutaneous Infantile Hemangioma: The Connection to Coagulation Disorders(2013) CRIADO, Paulo Ricardo; ALAVI, Afsaneh; HALPERN, Ilana; SOTTO, Mirian Nacagami; KIRSNER, Robert S.Livedoid vasculopathy is a bilateral painful and recurrent cutaneous ulcerative disorder of the legs that leads to atrophie blanche, atrophic white-porcelain scars, and is associated with disorders of fibrinolysis and/or coagulation. We present a young boy with an association between livedoid vasculopathy in the area of a previous involuted cutaneous hemangioma. We found 4 uncommon abnormalities associated with thrombo-occlusive events: heterozygous 20210 AG genotype of prothrombin, reduced activity of anticoagulation proteins C and S, and elevated lipoprotein (a).
conferenceObject Necrotisans erythema nodosum leprosum with systemic manifestations(2018) ISHIY, Patricia; TRINDADE, Maria Angela; AVANCINI, Joao; PAZZINI, Renato; JORGE, Lecticia; SOTTO, Mirian- Macrophage subtypes in recurrent nodular basal cell carcinoma after Mohs micrographic surgery(2017) PADOVEZE, Emerson H.; CHIACCHIO, Nilton Di; OCAMPO-GARZA, Jorge; CERNEA, Selma S.; BELDA, Walter; SOTTO, Mirian N.BackgroundThe macrophages associated with solid tumors are related to the progression or regression of tumors, depending on the differentiation in M1 or M2. M2 subtype promotes angiogenesis, remodeling, and tissue repair (tumor proliferation). In contrast, M1 produces toxic mediators and presents antigens, destroying microorganisms and tumor cells. The microenvironment of most aggressive forms of basal cell carcinoma (BCC) shows an increase in macrophages due to M2 phenotype compared to noninvasive forms. The treatment of nodular BCC by Mohs micrographic surgery (MMS) provides high cure rates, but relapses can occur. AimsTo compare the total population of macrophages and their subpopulations M1 and M2 in cases of recurrent and nonrecurrent nodular BCC after excision by MMS. Materials & MethodsHistological sections obtained from paraffin blocks of nine cases of recurrent nodular BCC after MMS and 18 cases of nonrecurrent nodular BCC operated by MMS were immunostained for iNOS, CD204, CD163, and CD68. The expression of these markers was analyzed by image analysis. ResultsNo significant differences were found between the groups in relation to the average percentage of M1 cells, M2 cells, and total cells. Discussion and ConclusionA relationship was not seen between tumor-associated macrophages (TAM) and tumor recurrence.