通过MAP激酶通路的重新激活,COT驱动对RAF抑制的抗性
Cory M Johannessen1, Jesse S Boehm, So Young Kim
1Broad Institute of Harvard and Massachusetts Institute of Technology, 7 Cambridge Center, Cambridge, Massachusetts 02142, USA.
Nature
|November 26, 2010
概括
通过向MAP3K8 (COT/Tpl2) 可以克服黑色素瘤对RAF抑制剂的抵抗. 这种激酶独立于RAF激活MAPK通路,为BRAF突变黑色素瘤患者提供新的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 遗传学是一种遗传学.
背景情况:
- BRAF突变驱动50-70%的黑色素瘤,产生对MAPK通路的依赖.
- RAF和MEK抑制剂显示临床成功,但受到耐药性的限制.
- 识别耐药机制对于开发持久治疗策略至关重要.
研究的目的:
- 在BRAF突变黑色素瘤中识别新的标和驱动RAF激酶抑制剂耐药性的机制.
- 探索克服针对性黑色素瘤疗法耐药性的治疗策略.
主要方法:
- 表达了大约600个激酶和相关的开放读取框架 (ORF) 来选抗性机制.
- 使用了BRAF (V600E) 黑色素瘤细胞系和来自患者的样本.
- 研究了确定目标在MAPK通路激活和药物耐药性中的作用.
主要成果:
- 确定了MAP3K8 (COT/Tpl2) 作为一个关键的MAPK通路激动剂,赋予RAF抑制的抵抗力.
- COT通过依赖MEK的,独立于RAF的信号来激活ERK.
- 在黑色素瘤细胞和患者组织中,COT表达与新生和获得的耐药性相关.
结论:
- 在BRAF突变黑色素瘤中,MAP3K8 (COT/Tpl2) 是抗RAF抑制剂的关键介质.
- 向COT激酶活性或使用组合MAPK通路抑制是潜在的治疗策略.
- 高通量功能屏幕可以有效地识别耐药机制,并为新的治疗方法提供信息.
相关概念视频
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...
Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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...
PI3K/mTOR/AKT Signaling Pathway
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 rapamycin-insensitive companion...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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...


