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- W3092968215 abstract "The thymus is responsible for thymocyte differentiation into immunocompetent T lymphocytes. Different cell types in the thymic microenvironment actively cooperate in this process, interacting with the developing thymocytes through soluble factors, extracellular matrix (ECM) molecules, and receptors. In addition, this microenvironment can be influenced by several factors, such as semaphorin-3A (Sema3A), which is a multifunctional protein involved in cell migration. We evaluated the Sema3A effects on the cellular parameters and functional features of thymic stromal cells.Thymic stromal cells were obtained by enzymatic digestion of the murine thymus. These cells were treated with Sema3A and evaluated as follows: cell morphology by scanning electron microscope, F-actin cytoskeleton and deposition of ECM molecules by fluorescence microscopy, and adhesion assays with freshly obtained thymocytes.The obtained thymic stroma was composed of 67% of thymic epithelial cells (TECs), and 90% of the TECs were positive for the Sema3A receptor neuropilin-1. These cells secreted CXCL12, IL-7 and extended thymocyte survival. Sema3A changed the morphology of thymic stromal cells and promoted F-actin reorganization. In addition, the fibronectin fibers were reoriented, and the laminin production was increased in Sema3A-treated thymic stromal cells. In the adhesion assays, there was an increase in the number of adhered thymocytes when thymic stromal cells were pretreated with Sema3A.Our data strongly suggest the active participation of Sema3A in thymic physiology, highlighting its role as an immunomodulatory molecule. This may provide important knowledge for understanding the interactions of thymic cells." @default.
- W3092968215 created "2020-10-22" @default.
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- W3092968215 date "2020-10-19" @default.
- W3092968215 modified "2023-09-26" @default.
- W3092968215 title "The Responsiveness of Thymic Stromal Cells to semaphorin-3A" @default.
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- W3092968215 doi "https://doi.org/10.1080/08820139.2020.1834578" @default.
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