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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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    科学领域:

    • 血液学 血液学 血液学
    • 分子生物学分子生物学
    • 老年学是指老年学的学科.

    背景情况:

    • 状细胞疾病 (SCD) 与髓状细胞恶性瘤和造血干细胞 (HSC) 功能障碍有关.
    • 对骨髓的病理性压力是疑似导致SCD相关的HSC问题的原因.

    研究的目的:

    • 研究SCD对骨髓造血干细胞和原生细胞 (HSPC) 的影响.
    • 探索老化剂作为SCD诱导的骨髓功能障碍的治疗策略.

    主要方法:

    • 来自小鼠和患有SCD的个体的骨髓HSPC的分析.
    • 在HSPC中评估细胞循环,氧化应激,DNA损伤和衰老.
    • 人类SCDHSPCs的造血潜力的评估ex vivo.
    • 用老化剂ABT-263 (navitoclax) 对SCD小鼠的治疗.

    主要成果:

    • SCD HSPCs表现出延长细胞周期时间,氧化应激,DNA损伤和衰老.
    • 人类SCDHSPCs表现出出体外血液形成潜能受损.
    • SCD小鼠经历了可移植骨髓HSPCs的显著损失.
    • 用ABT-263治疗逆转了SCD小鼠中HSPCs的损失.

    结论:

    • SCD导致显著的骨髓HSPC功能障碍,其特征是细胞应激和衰老.
    • 高龄化药物,特别是ABT-263,可以在SCD的小鼠模型中恢复骨髓功能.
    • 老化剂代表了一种有前途的治疗方法,可以改善SCD患者的骨髓健康,并提高基因疗法的安全性.