Video Experimental Relacionado
Updated: May 5, 2026
09:18
Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
Published on: December 27, 2016
7.9K
Identificación de dos genes evolutivamente conservados que regulan el procesamiento de las células apoptóticas
Jason M Kinchen1, Kodi S Ravichandran
1Center for Cell Clearance, University of Virginia, Charlottesville, Virginia 22908, USA. kinchen@virginia.edu
Nature
|March 23, 2010
Resumen
Los científicos descubrieron que SAND-1 (Mon1) y CCZ-1 (Ccz1) son cruciales para limpiar las células apoptóticas. Estas proteínas regulan la maduración del fagosoma, previniendo las enfermedades autoinmunes al asegurar la correcta eliminación de cadáveres en organismos multicelulares.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El aclaramiento celular apoptótico es vital para los organismos multicelulares.
- Los defectos en la limpieza de las células apoptóticas pueden conducir a enfermedades autoinmunes.
- La identificación de los reguladores clave de la envoltura celular apoptótica es crucial para comprender los mecanismos de la enfermedad.
Objetivo del estudio:
- Identificar nuevos factores involucrados en las diferentes etapas de la eliminación de cadáveres celulares apoptóticos.
- Aclarar el mecanismo por el cual estos factores regulan la maduración del fagosoma.
- Determinar la conservación evolutiva de estos factores en el aclaramiento celular.
Principales métodos:
- Estudios genéticos en el Caenorhabditis elegans.
- Análisis celulares biológicos y moleculares en células de mamíferos.
- Investigó el papel de SAND-1 y CCZ-1 en la maduración del fagosoma utilizando ensayos de reclutamiento RAB-5 y RAB-7.
Principales resultados:
- SAND-1 y CCZ-1 son esenciales para la progresión de los fagosomas desde el estadio RAB-5 al RAB-7.
- Los ortólogos de mamíferos Mon1a y Mon1b también son necesarios para la maduración del fagosoma.
- Mon1 actúa como un efector Rab5, y el complejo Mon1-Ccz1 enlaza las vías Rab5 y Rab7 en la maduración del fagosoma.
Conclusiones:
- SAND-1 (Mon1) y CCZ-1 (Ccz1) son componentes críticos y evolutivamente conservados que regulan el procesamiento de cadáveres celulares apoptóticos.
- Estas proteínas son esenciales para la maduración adecuada del fagosoma, vinculando las etapas temprana y tardía.
- Es probable que los defectos en la función SAND-1/Mon1 y CCZ-1/Ccz1 contribuyan a las enfermedades autoinmunes debido al deterioro del aclaramiento celular apoptótico.
Videos de Conceptos Relacionados
01:30Apoptosis
12.2K
Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
12.2K
01:24Caspases
8.7K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
8.7K
01:17The Extrinsic Apoptotic Pathway
6.2K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.2K
01:31The Intrinsic Apoptotic Pathway
6.2K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.2K
01:17Phagocytosis of Apoptotic Cells
3.9K
Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or immature dendritic cells. Non-professional phagocytes such as epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes.
Normal cells contain receptors that prevent them from being recognized...
Normal cells contain receptors that prevent them from being recognized...
3.9K
01:22Cellular Injury V: Apoptosis and Autophagy
121
Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
121