エリトロポエチンはDNAの分解を遅らせ,赤色素原始細胞のプログラム死亡を防ぐ
1Division of Hematology, Vanderbilt University Medical Center, Nashville, TN.
まとめ
エリトロポエチンというホルモンは,赤血球の発達におけるプログラム細胞死 (アポトーシス) を防ぐ. このホルモンは,原始細胞のDNA分解を減らし,赤血球の産生を制御する.
科学分野:
- 血液学 ヘマトロジ
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- 哺乳類の赤血球産生に対するエリトロポエチンの制御の正確なメカニズムは不明である.
- 赤血球形成のプロセスであるエリソポエーシスには,複雑な細胞調節が含まれています.
研究 の 目的:
- エリトロポエチンの作用を明らかにし,エリトロイド原始細胞の生存と分化を調節する.
- エリソポエチンがエリソポエチンのDNA分裂とエリソポエシス中のプログラム細胞死への影響を調査する.
主な方法:
- [3H]チミジンによるin vitroラベリング実験で,赤色素原体細胞におけるDNA分裂と修復を評価するために利用されました.
- DNA分裂率に対するエリトロポエチンの効果を定量化した.
- エリトロポエチンの存在と欠如における赤色素原始細胞の生存能力と分化をモニターした.
主要な成果:
- DNA分裂は,赤色素原始細胞で観察され,DNA修復と合成が伴いました.
- エリソポエチンはDNAの分裂を2.6.の因数で著しく減少させた.
- エリトロポエチンなしでは,原始細胞はアポトーシスを示すDNA分裂の断片を示し,16時間以内に細胞死を経験しました.
- エリソポエチンの治療は,原始細胞の生存と,網膜細胞への分化を促進しました.
結論:
- プログラムされた細胞死 (アポプトーシス) は,正常なエリソポエシスの重要な要因です.
- エリトロポエチンは,DNAの分解を阻害し,赤色素原細胞におけるアポトーシスを防止することによって,赤色素細胞の生成を制御します.
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.
Replicative Cell Senescence
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Erythropoiesis
Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia, and...
Replicative Cell Senescence
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Erythropoiesis
Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia, and...
Factors Affecting Erythropoiesis
The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...


