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冷休克蛋白在中心体中积累,其表达和初级纤毛形态受低温和切应力的调节。

Cold-shock proteins accumulate in centrosomes and their expression and primary cilium morphology are regulated by hypothermia and shear stress.

机构信息

Angiogenesis Unit, Oncology Area, Center for Biomedical Research of La Rioja (CIBIR), Logroño, Spain.

Tissue Microenvironment Lab (TMELab), University of Zaragoza, Aragón Institute of Engineering Research (I3A), Institute for Health Research Aragon (IIS Aragón), Zaragoza, Spain.

出版信息

Histol Histopathol. 2024 Apr;39(4):447-462. doi: 10.14670/HH-18-656. Epub 2023 Aug 3.

Abstract

Primary cilia act as cellular sensors for multiple extracellular stimuli and regulate many intracellular signaling pathways in response. Here we investigate whether the cold-shock proteins (CSPs), CIRP and RBM3, are present in the primary cilia and the physiological consequences of such a relationship. R28, an immortalized retinal precursor cell line, was stained with antibodies against CIRP, RBM3, and ciliary markers. Both CSPs were found in intimate contact with the basal body of the cilium during all stages of the cell cycle, including migrating with the centrosome during mitosis. In addition, the morphological and physiological manifestations of exposing the cells to hypothermia and shear stress were investigated. Exposure to moderately cold (32°C) temperatures, the hypothermia mimetic small molecule zr17-2, or to shear stress resulted in a significant reduction in the number and length of primary cilia. In addition, shear stress induced expression of CIRP and RBM3 in a complex pattern depending on the specific protein, flow intensity, and type of flow (laminar oscillatory). Flow-mediated CSP overexpression was detected by qRT-PCR and confirmed by Western blot, at least for CIRP. Furthermore, analysis of public RNA Seq databases on flow experiments confirmed an increase of CIRP and RBM3 expression following exposure to shear stress in renal cell lines. In conclusion, we found that CSPs are integral components of the centrosome and that they participate in cold and shear stress sensing.

摘要

初级纤毛作为细胞对外界多种刺激的传感器,通过响应这些刺激调节许多细胞内信号通路。在这里,我们研究了冷休克蛋白 (CSPs)、CIRP 和 RBM3 是否存在于初级纤毛中,以及这种关系的生理后果。R28 是一种永生化的视网膜前体细胞系,用针对 CIRP、RBM3 和纤毛标记物的抗体进行染色。在细胞周期的所有阶段,包括有丝分裂期间与中心体一起迁移时,两种 CSP 都被发现与纤毛的基体密切接触。此外,还研究了使细胞暴露于低温和切应力下的形态和生理表现。将细胞暴露于适度低温(32°C)、低温模拟小分子 zr17-2 或切应力下,会导致初级纤毛的数量和长度显著减少。此外,根据特定蛋白质、流强和流动类型(层流 振荡),切应力以复杂的模式诱导 CIRP 和 RBM3 的表达。通过 qRT-PCR 检测到 CSP 过表达,并通过 Western blot 进行了验证,至少对于 CIRP 是如此。此外,对肾细胞系暴露于切应力后的 RNA Seq 数据库的分析证实,CIRP 和 RBM3 的表达在暴露于切应力后增加。总之,我们发现 CSPs 是中心体的组成部分,它们参与了冷和切应力的感知。

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