致癌RAB蛋白的鉴定
Douglas B Wheeler1, Roberto Zoncu2, David E Root3
1Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center (MSKCC), New York, NY 10065, USA. Weill Cornell/Rockefeller University/Sloan Kettering Tri-Institutional MD-PhD Program, New York, NY 10021, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
概括
RAB35小瓜诺辛三酸酶 (GTPase) 调节PI3K/AKT通路. 在瘤中失调的RAB35激活了这种途径,促进了细胞的生存和转化.
科学领域:
- 分子生物学
- 细胞生物学
- 癌症学
背景情况:
- 酸3'-OH激酶 (PI3K) /AKT通路对于细胞生长,存活和新陈代谢至关重要.
- 在人类癌症中,PI3K/ AKT通路的调节失调是常见的.
- 内膜贩运在细胞信号传递中起作用,但其与PI3K/AKT通路的联系尚未完全理解.
研究的目的:
- 通过短毛RNA选,识别AKT酸化的新型调节剂.
- 研究RAB35小酸酶 (GTPase) 在PI3K/AKT通路中的作用.
- 探索RAB35突变在人类瘤中的致癌潜力.
主要方法:
- 短毛针RNA (shRNA) 查以确定影响AKT酸化的基因.
- 主导活性RAB35突变体的表达
- 免疫沉测试以评估蛋白质相互作用.
- 细胞转化试验和细胞亡抑制研究.
主要成果:
- RAB35被确定为PI3K/ AKT通路的调节者.
- RAB35的消耗抑制了AKT的酸化,而其活性突变物则主动激活了该途径.
- RAB35在增长因子受体下游和PDK1和mTORC2上游发挥作用.
- 来自人类瘤的体内RAB35突变构成性地激活了PI3K/ AKT信号,抑制了细胞亡和转化细胞.
- 致癌的RAB35诱导受体转移到内膜.
结论:
- RAB35是PI3K/AKT通路的关键调节者.
- RAB35中的突变可以通过构成性激活PI3K/AKT信号来促进癌症发生.
- 通过RAB35调节的内膜贩运可能是潜在的致癌机制.
相关概念视频
Rab Proteins
5.4K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
5.4K
Rab Cascades
3.8K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
3.8K
Small GTPases - Ras and Rho
5.7K
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:
5.7K
The Ras Gene
7.5K
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...
Ras is a...
7.5K
Rous Sarcoma Virus (RSV) and Cancer
6.6K
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
6.6K
Rous Sarcoma Virus (RSV) and Cancer
6.0K
6.0K


