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恶性疟原虫感染人红细胞诱导与红细胞生成障碍相关的转录变化。

Plasmodium falciparum infection of human erythroblasts induces transcriptional changes associated with dyserythropoiesis.

机构信息

Department of Pediatrics, Stanford University School of Medicine, Stanford, CA.

Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA.

出版信息

Blood Adv. 2023 Sep 26;7(18):5496-5509. doi: 10.1182/bloodadvances.2023010844.

Abstract

During development down the erythroid lineage, hematopoietic stem cells undergo dramatic changes to cellular morphology and function in response to a complex and tightly regulated program of gene expression. In malaria infection, Plasmodium spp parasites accumulate in the bone marrow parenchyma, and emerging evidence suggests erythroblastic islands are a protective site for parasite development into gametocytes. Although it has been observed that Plasmodium falciparum infection in late-stage erythroblasts can delay terminal erythroid differentiation and enucleation, the mechanism(s) underlying this phenomenon are unknown. Here, we apply RNA sequencing after fluorescence-activated cell sorting of infected erythroblasts to identify transcriptional responses to direct and indirect interaction with P falciparum. Four developmental stages of erythroid cells were analyzed: proerythroblast, basophilic erythroblast, polychromatic erythroblast, and orthochromatic erythroblast. We found extensive transcriptional changes in infected erythroblasts compared with that in uninfected cells in the same culture, including dysregulation of genes involved in erythroid proliferation and developmental processes. Although some indicators of cellular oxidative and proteotoxic stress were common across all stages of erythropoiesis, many responses were specific to cellular processes associated with developmental stage. Together, our results evidence multiple possible avenues by which parasite infection can induce dyserythropoiesis at specific points along the erythroid continuum, advancing our understanding of the molecular determinants of malaria anemia.

摘要

在红细胞谱系的发育过程中,造血干细胞经历了细胞形态和功能的巨大变化,以响应复杂而严格调控的基因表达程序。在疟疾感染中,疟原虫属寄生虫在骨髓实质中积累,新出现的证据表明成红细胞岛是寄生虫发育为配子体的保护性部位。尽管已经观察到晚期红细胞内的疟原虫感染可以延迟终末红细胞分化和去核,但这种现象的机制尚不清楚。在这里,我们应用荧光激活细胞分选感染的红细胞后进行 RNA 测序,以鉴定与疟原虫直接和间接相互作用的转录反应。分析了红细胞发育的四个阶段:原红细胞、嗜碱性红细胞、多色性红细胞和正红细胞。与同一培养物中未感染的细胞相比,我们发现感染的红细胞中存在广泛的转录变化,包括与红细胞增殖和发育过程相关的基因失调。尽管所有红细胞生成阶段都存在一些细胞氧化和蛋白毒性应激的指标,但许多反应是与发育阶段相关的细胞过程特异性的。总之,我们的研究结果表明寄生虫感染可以通过多种可能的途径在红细胞连续体的特定点诱导红细胞发育异常,从而加深我们对疟疾贫血分子决定因素的理解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef05/10515311/62e1ee7f06b5/BLOODA_ADV-2023-010844-ga1.jpg

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