在Ras转化纤维细胞中由氧化剂介导的线粒体信号传递
1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
概括
构成性活跃的H-RasV12转化细胞,增加像超氧化物这样的反应性氧物种 (ROS). 针对Ras通路,黄蛋白和Rac1的抗氧化剂和抑制剂抑制了ROS和细胞生长,表明ROS在Ras诱导的转化中介.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 在瘤学瘤学.
背景情况:
- 拉斯蛋白是细胞信号通路的关键调节者.
- 异常的Ras信号与各种癌症有关.
- 活性氧物种 (ROS) 在细胞增殖和转化中起着复杂的作用.
研究的目的:
- 研究反应性氧物种 (ROS) 在H-RasV12诱导的纤维细胞转化中的作用.
- 为了确定参与H-RasV12.12下游ROS生产的信号通路.
- 探索针对ROS通路作为对抗Ras驱动癌症的治疗策略的潜力.
主要方法:
- 在NIH 3T3纤维细胞中,H-RasV12.12稳定转化.
- 测量了超氧化物 (.O2-) 的产生.
- 表达了主导负的Ras和Rac1异型.
- 细胞被用法纳西转移酶抑制剂和二治疗.
- 在N-乙-L-氨酸治疗后评估了线粒生成活性.
- 分析了基激活蛋白激酶 (MAPK) 和c-Jun N-终端激酶 (JNK) 的活动.
主要成果:
- 转化H-RasV12的细胞显著增加了超氧化物 (.O2-) 的产生.
- .O2 - 产量被主导负Ras/Rac1,法纳西转移酶抑制剂和二降低.
- 抗氧化剂治疗 (N-乙-L-氨酸) 抑制了H-RasV12细胞的代活性.
- 在H-RasV12转化细胞中,MAPK活性下降,JNK没有被激活.
结论:
- 由H-RasV12诱导的细胞转化与ROS产量的增加有关,特别是超氧化物 (.O2-).
- 在H-RasV12介导的ROS生成中,Rac1和黄蛋白依赖性通路参与其中.
- 拉斯诱导的细胞循环进展可能由ROS独立于MAPK和JNK通路调解,这表明了拉斯驱动癌症的新治疗标.
相关概念视频
Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Abnormal Proliferation
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 daughter...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
mTOR Signaling and Cancer Progression
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...
Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...


