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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

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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

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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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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

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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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La generación y el mantenimiento de nichos de células madre hematopoyéticas se distinguen por un programa

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.

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La formación y el mantenimiento del nicho de células madre dependen de diferentes procesos moleculares. La comprensión de estos mecanismos distintos en las células estomales mesenquimales (CSM) podría avanzar en la medicina regenerativa.

Palabras clave:
médula ósearegulación epitranscriptómicaCélulas madre hematopoyéticasCélulas del estroma mesenquimalgeneración de nicho

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Área de la Ciencia:

  • Biología de las células madre
  • La epigenética
  • Biología del desarrollo

Sus antecedentes:

  • El nicho de la célula madre, crucial para la función de la célula madre, a menudo se ve como una estructura estática.
  • La regulación molecular que rige la formación inicial frente al mantenimiento continuo de los nichos de células madre se entiende mal.
  • Las células estromales mesenquimales (MSC) son constituyentes clave del nicho de células madre hematopoyéticas (HSC).

Objetivo del estudio:

  • Investigar si mecanismos moleculares distintos regulan el establecimiento y el mantenimiento del nicho HSC.
  • Comparar las funciones de la metilación del ARNm m6A en las CME perinatales frente a las adultas dentro del nicho de la CME.

Principales métodos:

  • Análisis comparativo de las CME de médula ósea perinatal y adulta.
  • Investigó la expresión y función de Mettl3 (una metiltransferasa m6A) y su objetivo Klf2 en MSC.
  • Se utilizaron estrategias de eliminación genética (Mettl3, Klf2) en células escamosas y osteoblastos en desarrollo y adultos.
  • Se evaluó la formación de nichos de HSC y la diferenciación osteogénica.

Principales resultados:

  • Las CMM perinatales muestran enriquecimiento en genes relacionados con la metilación del ARNm m6A, con la expresión de Mettl3 regulada a la baja después del nacimiento.
  • La deleción de Mettl3 en el desarrollo de MSCs perjudica la formación de nichos de HSC y promueve la diferenciación osteogénica.
  • La deleción de Klf2 rescata el defecto de nicho de HSC causado por la deleción de Mettl3 en el desarrollo de MSC.
  • La deleción de Mettl3 en las MSC postnatales no afecta al nicho de HSC.

Conclusiones:

  • La generación y el mantenimiento del nicho de células madre están controlados por mecanismos moleculares distintos.
  • La metilación del ARNm6A, específicamente la actividad de Mettl3 en el desarrollo de MSC, es crítica para el establecimiento de nichos de HSC.
  • Estos hallazgos ofrecen objetivos potenciales para estrategias de medicina regenerativa dirigidas a modular nichos de células madre.