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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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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

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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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Fetal Circulation01:14

Fetal Circulation

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
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Development of Blood Vessels01:07

Development of Blood Vessels

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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
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Production of Formed Elements01:34

Production of Formed Elements

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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...
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Updated: Jan 6, 2026

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
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Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis

Published on: September 9, 2014

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人間の胎児肝臓の血液形成の解読

Dorin-Mirel Popescu1, Rachel A Botting1, Emily Stephenson1

  • 1Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK.

Nature
|October 11, 2019
PubMed
まとめ

この研究では,ヒトの胎児の血液細胞の発達を単細胞プロファイリングでマッピングしています. 血液形成幹と多能原始体 (HSC/MPP) の分化と組織微環境の影響に関する新しい洞察を明らかにしています.

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Identification and Analysis of Mouse Erythroid Progenitors using the CD71/TER119 Flow-cytometric Assay
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Identification and Analysis of Mouse Erythroid Progenitors using the CD71/TER119 Flow-cytometric Assay

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Identification and Analysis of Mouse Erythroid Progenitors using the CD71/TER119 Flow-cytometric Assay
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Identification Of Erythromyeloid Progenitors And Their Progeny In The Mouse Embryo By Flow Cytometry
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科学分野:

  • 発達生物学
  • 血液学
  • 免疫学

背景:

  • 胎児の肝臓の血液形成は 血液と免疫細胞の生成に不可欠です
  • 人間の胎児の肝血形成,特に血液形成幹と多能原産体の行動 (HSC/MPP) はよく理解されていません.
  • 早期の血液細胞発達の理解は 小児の血液疾患の治療の鍵です

研究 の 目的:

  • ヒトの血液と免疫細胞の全範囲を 特定する
  • HSC/MPPの分化経路と組織マイクロ環境の影響をマッピングする.
  • 胎児の肝臓の血液形成に関する 総合的なアトラスを作成する

主な方法:

  • 約14万個の胎児の肝細胞と7万4000個の皮膚,腎臓,卵黄の細胞の単細胞トランスクリプトームプロファイリング.
  • HSC/MPPから差異化軌道を推論する.
  • HSC/MPPの差異化ポテンシャルの変化の機能的検証

主要な成果:

  • 発達中のヒトの血液と免疫細胞の完全なレパートリーを特定する.
  • 胎児の皮膚における生理学的エリトポエーシスの発見
  • マスト細胞と天然キラー/先天性リンパ性細胞の前駆体の検出
  • 赤血球の優位性から胎児の肝臓の血液生成組成の妊娠期の変化の観察,それに伴うHSC/MPPポテンシャルの変化.

結論:

  • この研究は,ヒト胎児の肝臓の血液形成の統合図を示しています.
  • この地図は,小児の血液と免疫障害の研究のための青写真として機能します.
  • これらの発見は,HSC/MPPの治療の可能性を活用するための基準となる.