p38 ミトゲン活性化タンパク質キナーゼは,内皮原始細胞をダウンレギュレーションします
Florian H Seeger1, Judith Haendeler, Dirk H Walter
1Molecular Cardiology, Department of Internal Medicine III, University of Frankfurt, Theodor-Stern-Kai 7, Frankfurt, Germany.
Circulation
|March 9, 2005
まとめ
p38 グルコースとTNF-αによるMAPキナーゼの活性化により,内皮原始細胞 (EPC) 数は減少する. SB203580でp38キナーゼを阻害すると,EPCが増加し,新血管化が改善され,細胞治療の可能性がある.
科学分野:
- 心血管生物学 心血管生物学
- 細胞シグナル伝達 細胞信号伝達
- 再生医学は,再生医療である.
背景:
- 内皮原生細胞 (EPC) は,新血管化に不可欠ですが,冠動脈疾患 (CAD) または糖尿病の患者では減少し,機能が低下しています.
- グルコースやTNF-αなどのリスク因子のEPCへの影響を調査することは,これらの障害を理解するために不可欠です.
研究 の 目的:
- グルコースとTNF-αがEPCの数と機能に影響を与えるメカニズムを解明する.
- EPCsの調節におけるp38 MAPキナーゼシグナル伝達の役割を決定する.
主な方法:
- 健康な被験者とCAD患者から分離されたEPC.
- 治療されたEPCには,グルコースとTNF-alphaの濃度が異なる.
- 分析されたp38 MAPキナーゼ経路の活性化 (p38,MSK1,CREBのリン酸化).
- 使用したp38キナーゼ阻害剤 (SB203580) と支配的陰性p38アデノウイルス.
- 評価されたEPC数,アポトーシス,増殖,分化マーカー (CD14,CD64) および体内新血管化能力.
主要な成果:
- グルコースとTNF-αは,アポトーシスを誘導することなく,EPCの数を減少させた.
- この2つの要因は,下流キナーゼと転写因子を含むp38 MAP キナーゼ経路を活性化させた.
- CAD患者では,基礎p38リン酸化がより高かった.
- p38キナーゼの抑制により,EPCの数と増殖が著しく増加しました.
- SB203580の治療は,CAD患者によるEPCsの新血管化能力を部分的に回復させました.
- 増加したEPCsは,単細胞マーカー発現の減少と相関しており,変異した分化を示唆しています.
結論:
- p38 MAPキナーゼは,EPC数と機能の重要な調節因子である.
- p38キナーゼを阻害することで,EPCに対するグルコースとTNF-αの有害な効果を相殺することができます.
- SB203580は,心血管疾患における細胞ベースの治療のためのEPC数を改善する可能性を秘めています.
関連する概念動画
Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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 Intrinsic Apoptotic Pathway
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...


