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Stem Cell Niche01:26

Stem Cell Niche

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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

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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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Maintenance of the ES Cell State01:14

Maintenance of the ES Cell State

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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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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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem 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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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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血液形成幹細胞のニッチ生成と維持は,表表表記プログラムによって区別される.

Longfei Gao1, Heather Lee1, Joshua H Goodman1

  • 1Columbia Stem Cell Initiative, Department of Rehabilitation and Regenerative Medicine, Department of Microbiology and Immunology, Columbia University Irving Medical Center, New York, NY 10032, USA.

Cell
|April 24, 2024
PubMed
まとめ

幹細胞のニッチ形成と維持は 異なる分子プロセスに依存しています メゼンキマ・ストロマ細胞 (MSC) のこの独特なメカニズムを理解することで,再生医療が進歩する可能性があります.

キーワード:
骨髄エピトランスクリプトミックの調節造血幹細胞メゼンキマ・ストロマ細胞ニッチ世代

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科学分野:

  • 幹細胞生物学
  • エピジェネティクス
  • 発達生物学

背景:

  • 幹細胞の機能に欠かせない幹細胞のニッチは 静的な構造と見なされることが多い.
  • 幹細胞のニッチの初期形成と継続的な維持を制御する分子調節は十分に理解されていません.
  • メセンキマル・ストロマル細胞 (MSC) は,血液形成幹細胞 (HSC) の重要な構成要素である.

研究 の 目的:

  • 異なる分子メカニズムがHSCニッチの確立と維持を制御するかどうかを調査する.
  • HSCのニッチ内での m6A mRNAメチル化と成人MSCの役割を比較する.

主な方法:

  • 胎児と成人の骨髄MSCの比較分析
  • Mettl3 (m6Aメチルトランスフェラーゼ) とその標的Klf2のMSCにおける発現と機能を調査した.
  • 発達期および成人期MSCおよびオステオブラストにおいて,遺伝子消去戦略 (Mettl3,Klf2) を利用した.
  • HSCのニッチ形成と骨質分化が評価された.

主要な成果:

  • 産後MSCは,m6A mRNAメチル化に関連する遺伝子の濃縮を示し,Mettl3発現は産後低下している.
  • 発達中のMSCにおけるMettl3の消去は,HSCのニッチ形成を阻害し,骨質的分化を促進する.
  • Klf2 削除は,開発中の MSC での Mettl3 削除によって引き起こされる HSC ニッチ 欠陥を救済します.
  • 産後MSCにおけるMettl3の削除はHSCのニッチに影響を与えない.

結論:

  • 幹細胞のニッチ生成と維持は 異なる分子メカニズムによって制御されます
  • m6A mRNAのメチル化,特にMSCの発達におけるMettl3の活動は,HSCのニッチ確立に不可欠である.
  • これらの発見は,幹細胞のニッチを調節することを目的とした再生医療戦略の潜在的なターゲットを提供します.