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- ItemAcesso aberto (Open Access)Comparação das características in vitro e perfil de expressão gênica entre células-tronco mesenquimais derivadas de pólipos nasais e da medula óssea(Universidade Federal de São Paulo (UNIFESP), 2018-11-07) Oliveira, Pedro Wey Barbosa De [UNIFESP]; Gregorio, Luis Carlos [UNIFESP]; http://lattes.cnpq.br/0512614520137100; http://lattes.cnpq.br/6030505570897126; Universidade Federal de São Paulo (UNIFESP)Introduction: Chronic rhinosinusitis (CRS) is clinically defined as persistent inflammation of the nasal mucosa and paranasal sinuses lasting at least 12 weeks;; Chronic rhinosinusitis with nasal polyposis is a disease with its pathophysiological mechanism not yet fully known;; it is believed that nasal polyps are formed by an imbalance in the inflammatory response and an imbalance of tissue remodeling. Classically, we observe a decrease in TGF beta and Treg determining a low immune response and an intense inflammatory response, especially an eosinophilic TH2 response. At the same time, we have an altered tissue repair mechanism with decreased fibrosis formation and intense mucosal edema, resulting in an altered extracellular matrix with elevation of hydrostatic pressure and possibly the formation of polyps. Mesenchymal stem cells (MSCs) are progenitor adult stem cells with the primary goal of supporting the tissue function in which they are in, but they also exhibit immunomodulation and tissue repair characteristics in the healing process. Therefore, we believe that it is fundamental to understand the behavior of the MSCs, especially the the MSC of the nasal polyp, in an attempt to elucidate the mechanism of its formation. Objective: To compare the in vitro characteristics and gene expression profile of mesenchymal stem cells of the nasal polyp (PO-MSC) with the mesenchymal stem cells of the bone marrow (BM-MSC). Materials and methods: We isolated the PO-MSC and BM-MSC and submitted the two groups to in vitro cell differentiation, immunophenotyping, proliferation and co-culture with lymphocytes and finally gene expression profile analysis of the two groups. Results and Discussion: The two groups showed fibroblastoid morphology and a similar potential for osteogenic / adipogenic differentiation, immunophenotyping showed that CTM-PN had a lack of molecules associated with the immune system. Co-cultures of peripheral blood and CTMs also showed a lower ability of CTM-PN to modulate the immune response. We detected in CTM-PN a distinct gene expression profile compared to CTM-MO. CTM- PN expressed higher levels of specific markers of progenitor stem cells (eg, CD133 and ABCB1), whereas the CTM-MO showed high expression of cytokines and growth factors (eg, FGF10, KDR and GDF6). Gene ontology analysis showed that the most expressed genes in the CTM-PN were related to the matrix remodeling process, hexose and glucose transport. CTM-MO showed highly expressed genes related to a distinct biological behavior such as angiogenesis, blood vessel morphogenesis, cell-cell signaling, and regulation of response to external stimuli. Conclusion: CTM-PN and CTM-MO are different sub-populations of CTMs, with distinct transcription profiles that reflect specific biological properties, compatible with the anatomical location of the tissue from which they were extracted. CTM-PN clearly has a lower immunomodulation capacity when compared to CTM-MO;; resulting in a reduced ability to control the local inflammatory process. The genes most significantly expressed in the CTM-PN are partially related to the process of tissue remodeling, extracellular matrix metabolism and tissue regeneration process;; physiopathological basis of RSCcPN. CTM-PN plays an important role in the development of nasal polyps.