TIMP-2による血管新生抑制:MMPから独立したメカニズム
Dong-Wan Seo1, Hongmei Li, Liliana Guedez
1National Cancer Institute, Center for Cancer Research, Vascular Biology Faculty and Laboratory of Pathology, Extracellular Matrix Pathology Section, National Institutes of Health, Bethesda, MD 20892, USA.
Cell
|July 31, 2003
まとめ
メタロプロテアゼの組織阻害剤 (TIMPs) は,マトリックスメタロプロテアゼ (MMP) 活性とは無関係に,内皮細胞の増殖と血管新生を阻害する. TIMP-2はインテグリン結合を利用して,タンパク質チロシンフォスファタゼの活性を調節し,新しい抗血管新生機構を明らかにします.
科学分野:
- バイオケミストリー バイオケミストリー
- 細胞生物学 細胞生物学
- 分子医学は分子医学である.
背景:
- メタロプロテインアゼの組織阻害剤 (TIMPs) は,マトリックスメタロプロテインアゼ (MMP) の活動を抑制することによって細胞外マトリックス改造を調節する.
- 生理学的および病理学的組織改造プロセスは,MMP活動に決定的に依存しています.
研究 の 目的:
- 内皮細胞増殖と血管新生におけるTIMP-2の役割を調査する.
- MMP阻害とは独立して,TIMP-2の血管新生抑制効果のメカニズムを解明する.
主な方法:
- インビトロ内皮細胞増殖アッセイ.
- インビヴォ血管新生モデル.
- インテグリン結合,タンパク質チロシンフォスファターゼ (PTP) 活性,受容体チロシンキナーゼシグナル伝達の分析.
主要な成果:
- TIMP-2は,MMP抑制とは無関係に,血管新生因子誘発の内皮細胞増殖と血管新生を廃止した.
- TIMP-2の効果は,アルファ3β1インテグリン媒介による内皮細胞への結合に依存していた.
- TIMP-2は,β1インテグリンサブユニットとSHP-1解離に関連したPTP活性を低下させ,FGFR-1とKDRのPTP活性を増加させました.
結論:
- TIMP-2は,MMPから独立したメカニズムを通じて,血管新生抑制効果を発揮する.
- TIMP-2は,インテグリン結合経由で内皮細胞のシグナル伝達を調節し,タンパク質チロシンフォスファタゼの活性に影響を与えます.
- これらの発見は,血管新生を制御するTIMP-2のための新しい経路を明らかにしています.
関連する概念動画
The Tumor Microenvironment
6.3K
Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
6.3K
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
Mechanism of Angiogenesis
6.4K
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
6.4K
Regulation of Angiogenesis and Blood Supply
2.9K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.9K
PI3K/mTOR/AKT Signaling Pathway
5.1K
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...
5.1K
Role of Matrix Metalloproteases in Degradation of ECM
2.9K
Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
2.9K


