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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

4.1K
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...
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Hematopoiesis01:21

Hematopoiesis

5.4K
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...
5.4K
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

3.2K
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...
3.2K
Production of Formed Elements01:34

Production of Formed Elements

1.5K
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...
1.5K
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

3.1K
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...
3.1K
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

1.4K
Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
1.4K

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関連する実験動画

Updated: Jul 16, 2025

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells
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Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

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血液形成に関する理解を深める

Samantha Joubran1, Vijay G Sankaran2

  • 1Division of Hematology/Oncology, Boston Children's Hospital and Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Chemical Biology PhD Program, Harvard Medical School, Boston, MA 02115, USA.

Cell
|September 15, 2023
PubMed
まとめ
この要約は機械生成です。

研究者らは血栓形成複合体の構造を明らかにし,幹細胞の自己再生と血液細胞の分化における機能を分離する方法を提供した.

さらに関連する動画

Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells
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Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells

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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

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関連する実験動画

Last Updated: Jul 16, 2025

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells
14:37

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Published on: November 1, 2017

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Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells
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Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells

Published on: February 25, 2007

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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis
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Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis

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科学分野:

  • 血液学
  • 分子生物学
  • 構造生物学

背景:

  • 血液細胞形成の過程である 血液形成は 幹細胞の自己再生と分化との 微妙なバランスに依存しています
  • トロンボポエチンシグナル伝達はこのバランスを調節する重要な経路です.
  • 血栓形成の分子メカニズムの理解は,血球の生成を制御するために不可欠です.

研究 の 目的:

  • トロンボポエチン リガンド受容体の構造を決定する.
  • 幹細胞の自己再生と血液形成の分化におけるトロンボポエチンの異なる役割の分離の可能性を調査する.

主な方法:

  • トロンボポエチン複合体の構造を明らかにするために,X線結晶学を用いた.
  • 複合体の構造が細胞プロセスに与える影響を評価するために,機能的測定が行われました.

主要な成果:

  • 研究では,その受容体複合体と結合するトロンボポエチンリガンドの高解像度構造が報告されています.
  • 幹細胞の自己再生と分化の両方を調節するメカニズムを示唆している.
  • この発見は,血栓形成シグナル伝達の標的型調節剤の開発の基礎となる.

結論:

  • トロンボポエチン複合体の決定された構造は,血液形成におけるその二重の役割を理解するための新しいプラットフォームを提供します.
  • この研究は,血液疾患の治療のために幹細胞の自己再生または分化を選択的に調節することを目的とした治療戦略の道を開きます.