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Infection of hematopoietic stem cells by Leishmania infantum increases erythropoiesis and alters the phenotypic and functional profiles of progeny

机译:Leishmania Infantum的造血干细胞感染增加红细胞,并改变了后代的表型和功能性谱

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摘要

Immunosuppression is a well-established risk factor for Visceral Leishmaniasis. Post-immunosuppression leishmaniasis is characterized by an increase of parasite burden, hematopoietic disorders and unusual clinical manifestations. Although there are many reports on bone marrow findings in VL, less is known about the relationship between parasite dynamics in this organ and the function of either hematopoietic stem cells and progenitor cells themselves. In the present study, we tackle these issues using a new approach of infecting human stem cells derived from bone marrow with L. infantum. Using this strategy, we show that human hematopoietic stem cells (hHSC) are able to phagocytize L. infantum promastigotes and release modulatory and pro-inflammatory cytokines, mainly TNF-alpha. Our results demonstrated that L. infantum infection in vitro enhances hematopoiesis, favoring the development of erythrocitic lineage through a mechanism yet unknown. Moreover, we found that L. infantum infection alters the phenotypic profile of the hematopoietic progeny; modifying the surface markers expression of differentiated cells. Thus, our study represents a rare opportunity to monitor the in vitro differentiation of human stem cells experimentally infected by L. infantum to better understand the consequences of the infection on phenotypic and functional profile of the cell progeny.
机译:免疫抑制是内脏LeishManiaisis的良好危险因素。免疫抑制后Leishmaniaisis的特征在于增加寄生虫负担,造血疾病和异常的临床表现。尽管VL中有许多关于骨髓发现的报道,但是关于该器官中寄生虫动力学与造血干细胞和祖细胞本身的功能的含义较少。在本研究中,我们使用用L. Infantum感染源自骨髓的人干细胞的新方法来解决这些问题。使用这种策略,我们表明人造血干细胞(HHSC)能够吞噬L. Infantum Promastigotes和释放调节和促炎细胞因子,主要是TNF-α。我们的研究结果表明,体外Inmantum感染增强了血小痘,通过尚未造成的机制,有利于红细胞谱系的发展。此外,我们发现L. imantum感染改变了造血后代的表型剖面;改变分化细胞的表面标记表达。因此,我们的研究代表了监测由L. Infantum实验感染的人干细胞的体外分化的难以理解的机会,以更好地了解感染对细胞后代的表型和功能概况的后果。

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