The Nox2-ROS-Nlrp3 Inflammasome Signaling Stimulates in the Hematopoietic Stem/Progenitor Cells Lipogenesis to Facilitate Membrane Lipid Raft Formation.

The Nox2-ROS-Nlrp3 Inflammasome Signaling Stimulates in the Hematopoietic Stem/Progenitor Cells Lipogenesis to Facilitate Membrane Lipid Raft Formation.
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DOI:
10.1007/s12015-022-10481-2
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发表时间:
2023-01
影响因子:
4.8
通讯作者:
Ratajczak, Mariusz Z.
Ratajczak, Mariusz Z.
中科院分区:
医学3区
文献类型:
--
作者:
Abdelbaset-Ismail, Ahmed;Ciechanowicz, Andrzej K.;Bujko, Kamila;Ratajczak, Janina;Kucia, Magdalena;Ratajczak, Mariusz Z.

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造血干细胞/祖细胞 (HSPC) 的增殖、代谢和迁移由外细胞膜上表达的受体协调,这些受体整合到微域(称为膜脂筏 (MLR))中。这些结构自由漂浮在细胞膜双层中,并富含胆固醇和鞘脂,以保证其功能完整性。如果受体在 MLR 中表达,则可以延长在细胞表面的占据时间并增强信号传导能力。基于此,我们对 HSPC 中 MLR 成分的合成调控产生了兴趣。为了解决这个问题,我们测试了促进增殖或迁移的选定因子的作用及其在 HSPC 中 MLR 成分合成中的潜在参与。基于我们之前的研究表明,Nox2-KO 和 Nlrp3-KO 小鼠的 HSPC 在 MLR 形成方面表现出严重缺陷,因此我们重点关注 Nox2-ROS-Nlrp3 炎症小体在调节 HSPC 脂肪生成中的作用。我们发现,在稳态条件下,Nox2 衍生的 ROS 是调节脂肪生成酶的正确表达所必需的,但在炎症过程中,Nlrp3 炎性体增强了这种作用。因此,我们的数据为 HSPC 中脂肪生成的调节以及 Nox2-ROS-Nlrp3 炎性体轴的参与提供了新的线索,该轴在稳态条件下不同地调节脂肪生成并响​​应炎症,调节 MLR 介导的这些细胞对外部刺激的反应。在线版本包含可在 10.1007/s12015-022-10481-2 获取的补充材料。
Proliferation, metabolism, and migration of hematopoietic stem/progenitor cells (HSPCs) are coordinated by receptors expressed on outer cell membranes that are integrated into microdomains, known as membrane lipid rafts (MLRs). These structures float freely in the cell membrane bilayer and are enriched in cholesterol and sphingolipids for their functional integrity. Receptors, if expressed in MLRs, have prolonged occupancy on the cell surface and enhanced signaling power. Based on this, we have become interested in the regulation of synthesis of MLRs components in HSPCs. To address this, we tested the effect of selected factors that promote proliferation or migration and their potential involvement in the synthesis of MLRs components in HSPCs. Based on our previous research showing that HSPCs from Nox2-KO and Nlrp3-KO mice display a profound defect in MLRs formation, we focused on the role of Nox2-ROS-Nlrp3 inflammasome in regulating lipogenesis in HSPCs. We found that while at steady state conditions, Nox2-derived ROS is required for a proper expression of enzymes regulating lipogenesis, during inflammation, this effect is augmented by Nlrp3 inflammasome. Thus, our data sheds new light on the regulation of lipogenesis in HSPCs and the involvement of the Nox2-ROS-Nlrp3 inflammasome axis that differently regulates lipogenesis at steady state conditions and in response to inflammation, modulating MLRs-mediated responsiveness of these cells to external stimuli. The online version contains supplementary material available at 10.1007/s12015-022-10481-2.
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