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Videos de Conceptos Relacionados

Nervous Tissue: Myelin01:25

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...
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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Video Experimental Relacionado

Updated: May 3, 2026

Preparation and Immunostaining of Myelinating Organotypic Cerebellar Slice Cultures
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Formación y remodelación de la mielina.

R Douglas Fields1

  • 1National Institutes of Health, NICHD, Bldg. 35, Room 2A211, Bethesda, MD 20892, USA.

Cell
|January 21, 2014
PubMed
Resumen
Este resumen es generado por máquina.

Las células gliales forman mielina, aislamiento esencial para la transmisión de impulsos nerviosos. Este estudio revela nuevos conocimientos sobre los mecanismos de formación y remodelación de la mielina.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología celular Biología celular.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • La mielina, un aislamiento derivado de las células gliales para los axones, es fundamental para la rápida conducción de los impulsos nerviosos.
  • El intrincado proceso de formación de mielina y su posterior remodelación por las células gliales sigue siendo incompletamente entendido.
  • Comprender estos mecanismos es crucial para abordar los trastornos neurológicos asociados con el daño de la mielina.

Objetivo del estudio:

  • Para dilucidar los mecanismos moleculares que rigen la formación de mielina por las células gliales.
  • Para investigar los procesos dinámicos involucrados en la remodelación de la mielina.
  • Proporcionar nuevos conocimientos sobre la coreografía celular de la mielinización.

Principales métodos:

  • Técnicas avanzadas de imagen para visualizar la dinámica de la vaina de mielina.
  • Manipulación genética de células gliales para estudiar las funciones genéticas relacionadas con la mielina.
  • Ensayos bioquímicos para analizar la composición de la proteína mielina y su rotación.

Principales resultados:

  • Identificación de proteínas y vías clave que regulan el envolvimiento de la mielina.
  • Observación de cambios dinámicos en la estructura de la mielina durante el desarrollo y la plasticidad.
  • Caracterización de las interacciones de las células gliales durante el mantenimiento y la reparación de la mielina.

Conclusiones:

  • El estudio proporciona una comprensión más profunda de las bases celulares y moleculares de la mielinización.
  • Estos hallazgos arrojan luz sobre cómo las células gliales orquestan la formación y remodelación de la mielina.
  • La investigación abre nuevas vías para estrategias terapéuticas dirigidas a enfermedades relacionadas con la mielina.