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Microvilli00:55

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Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Renewal of Intestinal Stem Cells01:23

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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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Invadosome is a broad category of cell surface structures with proteolytic activity that  degrades the extracellular matrix (ECM). Invadosomes are present in normal cell types, including macrophages, endothelial cells, and neurons, as well as tumor cells. Although the macrophage podosomes and tumor cell invadopodia are classified as invadosomes, they have different structures, molecular pathways, and functions. Podosomes are short structures that last for a few minutes. However,...
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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Assembly of Complex Microtubule Structures01:32

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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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Conjunto de borde de cepillo intestinal impulsado por la adhesión intermicrovillar basada en protocadherina.

Scott W Crawley1, David A Shifrin1, Nathan E Grega-Larson1

  • 1Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA.

Cell
|April 15, 2014
PubMed
Resumen
Este resumen es generado por máquina.

El ensamblaje del borde del cepillo se basa en enlaces de adhesión dependientes de calcio entre microvilli, mediados por protocadherinas específicas. Los defectos en este proceso, observados en los modelos de síndrome de Usher, resaltan la importancia de estos enlaces para la función intestinal.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología epitelial Biología epitelial.
  • Biología del desarrollo Biología del desarrollo.

Sus antecedentes:

  • Las microvillas apicales aumentan la superficie epitelial para la absorción y la defensa.
  • El borde del cepillo intestinal, compuesto de microvilli, es crucial para la homeostasis.
  • Los mecanismos del montaje del borde del cepillo siguen siendo poco conocidos.

Objetivo del estudio:

  • Para dilucidar los mecanismos moleculares que impulsan el ensamblaje del borde del cepillo intestinal.
  • Identificar las proteínas clave involucradas en la adhesión y organización microvillar.
  • Para investigar el vínculo entre los defectos del borde del cepillo y el síndrome de Usher.

Principales métodos:

  • Se han investigado vínculos de adhesión dependientes de Ca2+ entre microvilli.
  • Caracterizó el papel de la protocadherina-24 y la protocadherina parecida a la mucina en los enlaces intermicrovillares.
  • Utilizó un modelo de ratón con deficiencia de armónica del síndrome de Usher.

Principales resultados:

  • El ensamblaje del borde del cepillo es impulsado por la adhesión dependiente de Ca ((2+) entre microvilli.
  • La protocadherina-24 y la protocadherina parecida a la mucina forman complejos trans-heterófilos en las puntas microvillares.
  • La armonina y la miosina-7b facilitan la localización de la protocadherina microvillar.
  • La deficiencia de armonina causa una mala localización de la protocaherina y graves defectos en el borde del cepillo.

Conclusiones:

  • Reveló un mecanismo basado en la adhesión para el ensamblaje del borde del cepillo.
  • Identificó la adhesión mediada por protocaderina como crítica para la organización microvillar.
  • Estableció un vínculo entre la patología del síndrome de Usher y los defectos en el ensamblaje del borde del cepillo.