How are death receptors involved in the extrinsic pathway of apoptosis?

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In the context of apoptosis, the extrinsic pathway is a mechanism of programmed cell death initiated by external signals. Death receptors are transmembrane proteins that serve as the primary mediators of this pathway.1

When specific external ligands bind to these death receptors on the surface of a cell, they trigger a signaling cascade that leads to the activation of caspase proteolytic enzymes. Once activated, these enzymes initiate the execution phase of apoptosis, resulting in the orderly dismantling of the cell's cytoskeleton, organelles, and DNA. This process ensures that damaged or unnecessary cells are removed without releasing their contents into the surrounding tissue, allowing the remnants to be safely engulfed by scavenger cells.1