SMAD3和PINK1构成了调节线粒的新正反循环
Mingzhu Tang1, Guang Lu2, Han-Ming Shen1
1Faculty of Healthy Sciences, Ministry of Education Frontiers Science Center for Precision Oncology, University of Macau, Macau, China.
Autophagy
|April 25, 2025
概括
一项新的研究显示,SMAD3蛋白调节PINK1 (PTEN诱导激酶1) 基因转录,在细胞应激期间增强线粒. 这一发现揭示了一种新的促生存途径,涉及SMAD3和PINK1,这对维持细胞平衡至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 线粒体,选择性去除受损的线粒体,对于细胞健康至关重要.
- PINK1 (PTEN诱导的激酶1) -PRKN/帕金通路是一种已知的正反循环,调节了线粒.
- 在线粒体应激期间PINK1的转录调节在很大程度上仍然没有表征.
研究的目的:
- 在线粒体应激条件下阐明PINK1的转录控制.
- 研究SMAD3在调节PINK1表达和线粒细胞衰变中的作用.
- 了解TGF-β/SMAD信号传递和线粒之间的相互作用.
主要方法:
- 研究了PINK1.1的转录调节.
- 利用技术研究蛋白质酸化和无处不在.
- 检查了SMAD3-PINK1调节轴对线粒体脱极化的反应.
主要成果:
- 确定了SMAD3作为PINK1转录的新型调节剂.
- 在Serine 423/425中证明了PINK1-介导的SMAD3酸化,独立于正规的TGF-β信号传递.
- 在SMAD3和PINK1之间建立了积极的前循环,促进了线粒和细胞存活.
结论:
- 通过PINK1酸化激活SMAD3,增强PINK1的转录,创建一个前循环.
- 这种SMAD3-PINK1轴代表了一种针对线粒体压力的新型亲存活机制.
- 需要进一步的研究来探索TGF-β/SMAD信号传输和线粒之间的交叉声.
相关概念视频
PI3K/mTOR/AKT Signaling Pathway
3.3K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.3K
mTOR Signaling and Cancer Progression
3.6K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.6K
Abnormal Proliferation
4.3K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.3K
TGF - β Signaling Pathway
7.2K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.2K
Translocation of Proteins into the Mitochondria
3.0K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.0K
Negative Regulator Molecules
35.0K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.0K


