関連する実験動画
Updated: Jul 9, 2026

11:50
Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
Published on: April 10, 2012
まとめ
研究者は,真の多能性を持つユニークなリンパ球群を特定しました. これらの細胞は増殖し,様々な種類の血液細胞に微分化することができ,潜在的に最も初期のヒトの祖先の血液細胞を表しています.
科学分野:
- 血液学 ヘマトロジ
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
背景:
- リンパ球は,多様な機能を持つ重要な免疫細胞です.
- 現在の理解では,胸腺に依存するリンパ球と,胸腺に相当するリンパ球を区別している.
- ヒトの原始的で多能な血元細胞の存在は,依然として活発な調査の分野です.
研究 の 目的:
- 多能性を示す独特のリンパ球群を特定し,特徴づけること.
- これらのユニークな細胞の分化能力をin vitroで実証する.
- ヒトにおける原始的な血球の祖先の証拠を提供するために.
主な方法:
- サイズと特定の表面マーカーの欠如に基づいて,明確なリンパ球集団の分離.
- これらの孤立したリンパ球のインビトロ培養.
- 細胞の増殖と分化を様々な血球系統に分析する.
主要な成果:
- 甲状腺に依存する細胞と甲状腺に相当する細胞とは異なる,より大きなリンパ球の集団が特定されました.
- これらのリンパ球は,インビトロ培養で真の多能性を示した.
- 細胞は成功裏に増殖し,赤血球,粒状細胞,および大核細胞の子孫に分化しました.
結論:
- ヒトでは,真の多能性を持つユニークなリンパ球群が特定されています.
- この細胞集団は,複数の血統に微分化できる原始的な血細胞の祖先を表しています.
- この発見は,ヒトの血液形成と早期の血液細胞発達の理解に大きな進歩をもたらします.
関連する概念動画
Hematopoiesis
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...
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...
Overview of Hematopoiesis
Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
Production of Formed Elements
Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...
Most HSCs commit to...
Lifecycle of Erythrocytes
Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups.
Structure and Function of Platelets
The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...

