探索宏分子拥挤和TNFR1在细胞体积控制中的作用
Parijat Biswas1, Priyanka Roy1, Subhamoy Jana1
1School of Biological Sciences, Indian Association for the Cultivation of Science, Kolkata, India.
eLife
|September 19, 2024
概括
大分子拥挤 (MMC) 影响细胞体积调节. 高的MMC会破坏细胞过程,但细胞使用调节体积增加 (RVI) 来恢复平衡,涉及TNFR1-NFkB信号传递.
科学领域:
- 细胞生物物理学 细胞生物物理学
- 分子细胞生物学 分子细胞生物学
- 生理学 生理学 生理学
背景情况:
- 宏分子拥挤 (MMC) 是一个细胞内状况,由高的cosolute密度引起.
- MMC 影响生化反应和运输,维持细胞平衡.
- 细胞体积的变化,特别是高度的收缩,改变了MMC,并可能导致细胞死亡.
研究的目的:
- 确定EGFP的光异构性,作为测量细胞MMC的工具.
- 在细胞体积变化期间调查MMC的时空动态.
- 阐明MMC在细胞对高压和调节体积增加 (RVI) 的反应中的作用.
主要方法:
- 利用EGFP光异构来量化细胞内MMC.
- 在不同的细胞外超性条件下研究了各种细胞系中的MMC动态.
- 使用药理抑制和基因淘汰 (TNFR1,RIPK1) 来研究信号通路.
主要成果:
- 动蛋白细胞骨会影响附着细胞内的空间MMC分布.
- 细胞MMC与DNA含量没有相关性,但与细胞传播面积有抗相关性.
- 超性下RVI能力与核因子卡帕β (NFkB) 激活相关,由瘤亡因子受体1 (TNFR1) 启动.
- 严重的高性增加了MMC,提高了细胞质微粘度,抑制了TNFR1-NFkB信号传递,从而损害了RVI.
结论:
- MMC在细胞透适应性中起着至关重要的作用.
- TNFR1-NFkB信号传递参与在高血压压力期间调节RVI.
- 升高的MMC可以阻碍细胞在压力下生存所需的基本信号通路.
相关概念视频
Cells Coordinate Growth and Proliferation
4.5K
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
4.5K
Cell-matrix's Response to Mechanical Forces
2.6K
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
2.6K
Receptor Downregulation in MVBs
2.0K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.0K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
Regulation of Angiogenesis and Blood Supply
2.5K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.5K
Intracellular Signaling Affects Focal Adhesions
2.6K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.6K


