関連する実験動画
Updated: Jul 25, 2026

09:58
RhoC GTPase Activation Assay
Published on: August 22, 2010
腫瘍維持における腫瘍性Rasの重要な役割
1Adult Oncology, Dana Farber Cancer Institute, Boston, Massachusetts 02115, USA. lynda_chin@dfci.harvard.edu
Nature
|August 10, 1999
まとめ
この研究は,腫瘍遺伝子のH-RasV12Gが,メラノーマ腫瘍の発達と継続的な成長の両方にとって重要であることを示しています. H-RasV12Gの発現を阻害すると,腫瘍が著しく後退し,がんの維持に不可欠な役割を強調します.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 腫瘍発生は,腫瘍遺伝子と腫瘍抑制剤に影響を与える遺伝的変異を伴う.
- 確立された腫瘍は,血管新生と免疫回避を含む維持のための複雑な宿主-腫瘍相互作用に依存しています.
- 腫瘍の維持期間中の初期がん促進突然変異の関連性は不明である.
研究 の 目的:
- メラノーマの発生と維持におけるH-RasV12Gの役割を調査する.
- H-RasV12Gが確立した腫瘍の維持に不可欠かどうかを判断する.
- 活性化されたRasが腫瘍を in vivo 維持するメカニズムを探求する.
主な方法:
- INK4a腫瘍抑制剤が欠けているドキシサイクリン誘導性H-RasV12Gマウスメラノーマモデルを使用しました.
- H-RasV12Gの発現を誘発するためにドキシサイクリンを投与し,その後,効果を観察するためにそれを撤回しました.
- 腫瘍の回帰,アポプトシス,および血管内皮成長因子 (VEGF) 調節をインビトロおよびインビボで分析した.
主要な成果:
- ドキシサイクリンの離脱後にH-RasV12Gのダウンレギュレーションは,メラノーマの有意な臨床的および組織学的回帰を引き起こしました.
- 腫瘍の回帰は,腫瘍と内皮細胞の両方でアポトーシスと関連していました.
- 活性化されたRasの腫瘍維持機能は,VEGFの調節を超えて広がり,VEGFが腫瘍活性を維持できないことが示されています.
結論:
- H-RasV12Gは,固体腫瘍,特にメラノーマの発症 (発生) と継続的な成長 (維持) に不可欠です.
- H-RasV12Gをターゲットにすることは,既成のメラノーマに対する潜在的な治療戦略です.
- この研究は,腫瘍の発達と進行における腫瘍遺伝子の二重の役割に関する重要な遺伝的証拠を提供します.
関連する概念動画
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...
Rous Sarcoma Virus (RSV) and Cancer
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...
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:
Rous Sarcoma Virus (RSV) and Cancer
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...
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...

