SILVIA VANESSA LOURENCO
Projetos de Pesquisa
Unidades Organizacionais
ODE, FO - Docente
LIM/06 - Laboratório de Imunopatologia da Esquistossomose e outras Parasitoses, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/06 - Laboratório de Imunopatologia da Esquistossomose e outras Parasitoses, Hospital das Clínicas, Faculdade de Medicina - Líder
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- CD24 and CD44 in salivary gland pleomorphic adenoma and in human salivary gland morphogenesis: differential markers of glandular structure or stem cell indicators?(2013) IANEZ, Renata C. F.; COUTINHO-CAMILLO, Claudia M.; BUIM, Marcilei E.; PINTO, Clovis A. L.; SOARES, Fernando A.; LOURENCO, Silvia V.Aims Salivary gland neoplasms originate from salivary gland compartments, to which they are histologically related. Pleomorphic adenoma (PA) is a benign salivary gland neoplasm that comprises epithelial and myoepithelial cells and a complex stroma, whose structure, architecture and origin (from intercalated ducts) suggest stem cell participation. We compared the expression of CD24 and CD44 in PA and in developing human salivary glands to investigate whether these markers can be considered as cancer stem cell markers. Methods and results One hundred and one cases of PA and salivary gland specimens from 20 human fetuses were examined by immunohistochemistry and real-time reverse transcription polymerase chain reaction (RT-PCR). All PAs were positive for CD24 and CD44 by immunohistochemistry: neoplastic luminal structures were positive for CD24; modified myoepithelial cells were positive for CD44. In fetal salivary glands, these markers were restricted to the intercalated duct region. Real-time RT-PCR assays detected increased expression of CD44, but not CD24, in PA specimens in comparison with normal salivary gland controls. Conclusions PA and stem cells share the expression of CD24 and CD44; their value as markers of neoplastic cell multipotency and the implications of their expression for tumour behaviour are yet to be determined.
conferenceObject Fibrous dysplasia vs ossifying fibroma of the jaw: Immunological characterization performing osteoprotegerin, RANK and RANKL proteins(2012) LASCANE, N.; COUTINHO-CAMILLO, C. M.; CARVALHO, A. d. Moraes; SOARES, F. A.; LOURENCO, S. V.conferenceObject Contribution of apoptosis to human salivary gland lumen formation: Importance of basic science(2014) TESHIMA, T.; COUTINHO-CAMILLO, C.; IANEZ, R.; TUCKER, A.; LOURENCO, S. V.article 14 Citação(ões) na Scopus MAP Kinase Pathways: Molecular Roads to Primary Acral Lentiginous Melanoma(2015) FERNANDES, Juliana D.; HSIEH, Ricardo; FREITAS, Luiz A. R. de; BRANDAO, Miguel A. R.; LOURENCO, Silvia V.; SANGUEZA, Martin; NICO, Marcello M. S.The etiology and pathogenesis of lentiginous acral melanomas are poorly understood. Recent studies have postulated that DNA repair mechanisms and cell growth pathways are involved in the development of melanoma, particularly changes in the MAPK pathways (RAS, BRAF, MEK 1/2, and ERK 1/2). The aim of this study is to assess the status of the MAP kinase pathways in the pathogenesis of acral melanomas. The authors examined the components of the RAS-RAF-MEK-ERK cascades by immunohistochemistry in a series of 16 primary acral melanomas by tissue microarray. The expression of MAP kinase cascade proteins changed in most cases. The authors observed that 57.14% of cases were BRAF positive and that 61.53%, 71.42%, and 71.42% of cases were positive for MEK2, ERK1, and ERK2, respectively; RAS was not expressed in 92.31%, and all cases were negative for MEK1. The absence of RAS and positivity for MEK2, ERK1, and ERK2 were most seen in invasive cases with high thickness. These aspects of the MAPK pathway require further examination in acral melanomas between different populations. Nevertheless, the results highlight significant alterations in the MAP kinase cascades that are related to histological indicators of prognosis in primary acral melanomas.conferenceObject Caspases involvement with ductal lumen formation during human salivary gland morphogenesis(2013) TESHIMA, T.; BOLOGNA, S.; IANEZ, R.; COUTINHO-CAMILLO, C.; LOURENCO, S.conferenceObject Preliminary Proteomic Analysis of Saliva from Patients with Sjogren's Syndrome(2015) BOLOGNA, S. B.; SOUZA, M. M.; NUNES, T. B.; NICO, M. M. S.; PASOTO, S. G.; LOURENCO, S. V.- Metastasis to the Oral Cavity: Report of 12 Cases(2022) V, Silvia Lourenco; FLOREZI, Giovanna P.; SMITTER, Anabel S.; BOLOGNA, Sheyla B.; NICO, Marcello M. S.Oral cavity is not a common route for metastatic dissemination; metastasis to the oral region may affect soft tissues and jawbones, accounting for approximately 1% of all oral malignant neoplasms. The diagnosis of metastatic lesions to the oral cavity is usually challenging to clinicians and pathologists because of their complexity and rarity. We present a series of 12 metastatic neoplasms to the oral cavity that were detected previously or after the diagnosis of the primary tumor. All tumors were of epithelial origin with primary sites in the esophagus (2 cases), colon (2 cases), bladder, lungs, liver, larynx, skin, uterus, prostate, and adrenal gland, each with one case. The commonest site of the metastatic masses in the oral cavity was the gingiva, frequently presented as a vegetating, friable mass. The clinical examination and histopathologic analysis of the lesions were central to establishing the final diagnosis of the tumors. Metastatic masses to the oral cavity should always be considered as differential diagnosis of benign-looking lesions, especially in patients with previous history of a malignant disease. Biopsy is mandatory to establish an accurate diagnosis.
- miR-221 ans miR-222 expression in salivary gland tumors(2015) IANEZ, Renata Carolina Fraga; COUTINHO-CAMILLO, Claudia; PINTO, Clovis; SOARES, Fernando; LOURENCO, Silvia
- The CDKN2A and MAP Kinase Pathways: Molecular Roads to Primary Oral Mucosal Melanoma(2013) HSIEH, Ricardo; NICO, Marcello M. S.; COUTINHO-CAMILLO, Claudia M.; BUIM, Marcilei E.; SANGUEZA, Martin; LOURENCO, Silvia V.The etiology and pathogenesis of oral mucosal melanomas are poorly understood, and no intraoral risk factors have been identified. Recent studies have postulated that DNA repair mechanisms and cell growth pathways are involved in the development of melanoma-particularly changes in the CDKN2A (p16-cyclinD-Cdk-pRb) and MAPK pathways (RAS, BRAF, MEK 1/2, and ERK 1/2 proteins). We examined the central components of the CDKN2A and RAS-RAF-MEK-ERK cascades by immunohistochemistry in a series of 35 primary oral melanomas by tissue microarray (TMA). We noted altered expression of the CDKN2A cascade proteins, although these modulations did not correlate significantly with clinical and pathological parameters. The expression of MAP kinase cascade proteins changed in most cases. We observed that 28.57% of cases were RAS-positive and that 82.85% and 74.28% of cases were positive for BRAF and ERK2, respectively; MEK2 and ERK1 were not expressed in 48.57% and 80% of cases, and all cases were negative for MEK1. The absence of RAS and ERK1 and positivity for BRAF and ERK2 were associated with higher histological grade, vascular invasion, and metastasis. Expression of MEK2 was significantly linked to vascular invasion (P = 0.043). The CDKN2A and MAPK pathways require further study in mucosal melanomas, but our results highlight the significance of important alterations, particularly with regard to histological indicators of poor prognosis in primary oral mucosal melanomas, independent of UV exposure.
conferenceObject Actinic Prurigo Cheilitis: A Clinicopathologic Review of 75 Cases of Lip Lesions in Actinic Prurigo(2015) BATDORF, Bjorn; PRIETO, Victor; MERCADILLO, Patricia; MEDINA, Juan Carlos Diez de; LOURENCO, Silvia; SANGUEZA, Martin; PLAZA, Jose