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Bone Marrow Sampling and Transplants01:22

Bone Marrow Sampling and Transplants

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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
The transplant begins with high doses of chemotherapy and radiation treatment, which aim to destroy...
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The Tumor Microenvironment02:17

The Tumor Microenvironment

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Bone Cells and Tissue01:30

Bone Cells and Tissue

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the...
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Chromatographic Resolution01:15

Chromatographic Resolution

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In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...
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Spongy Bone01:09

Spongy Bone

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Compact Bone01:27

Compact Bone

16.3K
Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Video Experimental Relacionado

Updated: Jan 26, 2026

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging
10:03

Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging

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El microambiente de la médula ósea en resolución de una sola célula

Anastasia N Tikhonova1,2, Igor Dolgalev3,4,5, Hai Hu3,4

  • 1Department of Pathology, NYU School of Medicine, New York, NY, USA. Anastasia.Tikhonova@nyumc.org.

Nature
|April 12, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio mapea las células de la médula ósea del ratón con una resolución de una sola célula, revelando interacciones celulares complejas que regulan la formación de células sanguíneas (hematopoyesis). El estrés altera significativamente este microambiente, afectando el desarrollo de las células madre.

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Área de la Ciencia:

  • Hematología
  • Biología de las células madre
  • Biología molecular

Sus antecedentes:

  • El microambiente de la médula ósea es crucial para regular la hematopoyesis, pero su complejidad molecular y respuesta al estrés siguen siendo poco conocidas.
  • Comprender la dinámica celular y molecular del nicho de la médula ósea es esencial para descifrar los procesos de formación de células sanguíneas.

Objetivo del estudio:

  • Mapear el paisaje transcripcional de las poblaciones de células vasculares, perivasculares y osteoblásticas de médula ósea de ratón con resolución de una sola célula.
  • Investigar cómo estas poblaciones celulares responden transcripcionalmente a la homeostasis y a la hematopoyesis inducida por el estrés.
  • Identificar las fuentes celulares de los factores reguladores clave y comprender su papel en la hematopoyesis.

Principales métodos:

  • Se empleó la secuenciación de ARN unicelular (scRNA-seq) para analizar los perfiles transcripcionales.
  • Se realizó un análisis comparativo de células de médula ósea en condiciones homeostáticas y de estrés.
  • Centrarse en las poblaciones de células vasculares, perivasculares y osteoblásticas dentro del nicho de la médula ósea.

Principales resultados:

  • Reveló una heterogeneidad celular significativa dentro del nicho de la médula ósea.
  • Se han identificado poblaciones celulares específicas como fuentes de factores pro-hematopoyéticos.
  • Se ha demostrado una remodelación sustancial de la transcripción de elementos de nicho bajo estrés, incluido el sesgo adipocítico de las células perivasculares.
  • Se observó una regulación a la baja de los ligandos del tipo delta de Notch (Dll1 y Dll4) vasculares bajo estrés.
  • Se encontró que la ausencia de Dll4 vascular condujo a la diferenciación mieloide prematura en las células madre hematopoyéticas.

Conclusiones:

  • Comprensión refinada de la arquitectura celular y el paisaje molecular del nicho de la médula ósea.
  • Destacó la naturaleza dinámica y heterogénea del nicho, que es sensible al estrés.
  • Ilustró la utilidad de la transcriptómica de una sola célula en la disección de la regulación de la hematopoyesis por poblaciones de nicho discretas.