Video Experimental Relacionado
Updated: Dec 25, 2025

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
9.0K
Los metabolitos liberados por las células apoptóticas actúan como mensajeros de tejido
Christopher B Medina1,2, Parul Mehrotra3, Sanja Arandjelovic1,2
1Center for Cell Clearance, University of Virginia, Charlottesville, VA, USA.
Nature
|April 3, 2020
Resumen
Las células apoptóticas liberan activamente metabolitos específicos, no pasivamente, para señalar a las células vecinas. Esto regulado
Área de la Ciencia:
- Biología celular
- Inmunología
- Metabolomía
Sus antecedentes:
- La apoptosis dependiente de la caspasa es crucial para la homeostasis de los tejidos, la regulación de la inflamación, la proliferación y la regeneración.
- Los mecanismos precisos por los cuales las células apoptóticas ejercen diversos efectos en su entorno tisular siguen siendo incompletamente entendidos.
Objetivo del estudio:
- Para perfilar el secretoma del metabolito de las células apoptóticas.
- Investigar el impacto funcional de estos metabolitos liberados en células vecinas y en modelos de enfermedades.
Principales métodos:
- Perfilamiento del secretoma del metabolito apoptótico de varios tipos de células.
- Investigando el papel de la apertura del canal 1 de la pannexina mediada por la caspasa en la liberación de metabolitos.
- Evaluación de los efectos del secretoma apoptótico en la expresión génica en células sanas.
- Evaluación del potencial terapéutico de los metabolitos apoptóticos en modelos de ratón de artritis inflamatoria y rechazo de injerto pulmonar.
Principales resultados:
- Las células apoptóticas, mientras mantienen la integridad de la membrana, liberan subconjuntos específicos y regulados de metabolitos.
- La liberación del metabolito es facilitada por la apertura del canal 1 de la pannexina mediada por la caspasa, con actividad metabólica en curso.
- El secretoma apoptótico suprime la inflamación, la proliferación celular y promueve la curación de heridas en las células receptoras.
- Un cóctel de metabolitos apoptóticos redujo significativamente la gravedad de la enfermedad en modelos de artritis inflamatoria y rechazo de injerto pulmonar.
Conclusiones:
- Las células apoptóticas se comunican activamente con su entorno a través de una liberación regulada de metabolitos, denominados "secreto apoptótico".
- Este secretoma actúa como una señal de "adiós", modulando activamente las respuestas de los tejidos para promover la resolución y la homeostasis.
- Estos hallazgos redefinen el papel de las células apoptóticas de entidades pasivas a reguladores activos de microambientes tisulares y resultados de enfermedades.
Videos de Conceptos Relacionados
Phagocytosis of Apoptotic Cells
4.8K
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...
4.8K
Apoptosis
13.6K
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...
13.6K
The Extrinsic Apoptotic Pathway
7.8K
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...
7.8K
The Intrinsic Apoptotic Pathway
8.0K
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...
8.0K
Overview of Cell Death
9.1K
Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the...
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the...
9.1K
Necrosis
6.1K
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
6.1K

