Apoptosis Regulation
Apoptosis Regulation - Related Videos
08:34
Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
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Cited by 5 •
2016
Adipose tissue (AT) can influence whole body homeostasis, therefore understanding the molecular mechanisms of adipocyte differentiation and function is of importance. We provide a protocol for gaining new insights into these processes by analyzing adipocyte homeostasis, differentiation and hypoxia exposure as a model for induced adipocyte apoptosis.
07:42
Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
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Cited by 15 •
2011
In this protocol, we describe the direct cytoplasmic microinjection of cytochrome c protein into fibroblasts and primary sympathetic neurons. This technique allows for the introduction of cytochrome c protein into the cytoplasm of cells and mimics the release of cytochrome c from mitochondria, which occurs during apoptosis.
01:30
Apoptosis
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2023
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 reduction of the tissue.
01:23
Negative Regulator Molecules
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2019
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria. Three of the best-understood negative regulators are p53, p21, and retinoblastoma protein (Rb). The regulatory roles of each of these proteins were discovered after faulty copies were found in cells with uncontrolled replication (i.e., cancer). These...
06:58
Synthesis of an In vivo MRI-detectable Apoptosis Probe
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Cited by 3 •
2012
Early detection of apoptosis may identify at-risk cell populations in a variety of diseases. Here we demonstrate a method to link an early apoptosis-detection protein (Annexin V) to a MRI-detectable iron oxide nanoparticle (SPIO). This method may be extended to other proteins of interest to generate MRI-detectable molecular imaging probes.
FAQs
Intrinsic signals arise from stresses associated with mitochondria, whereas extrinsic signals begin with activation of death receptors. Despite these different starting points, both routes converge on initiator caspases, which then activate executioner caspases. This convergence allows diverse cellular conditions to engage a shared downstream dismantling process while retaining distinct upstream controls.
BCL-2 family proteins help determine whether mitochondria release apoptogenic factors, making them an important decision point in the intrinsic pathway. Their activity links mitochondrial stress to downstream caspase activation. Because this checkpoint influences whether a cell proceeds toward death, it helps preserve tissue balance and limits inappropriate survival of abnormal cells.
The separation between initiator and executioner caspases creates a controlled signaling sequence. Initiator caspases receive converging signals from the intrinsic and extrinsic pathways, then activate executioner caspases that carry out the downstream cell-death program. This arrangement helps prevent isolated upstream signals from producing uncontrolled cell loss and supports precise responses to cellular conditions.
Insufficient control can allow abnormal cells to survive, while excessive or inappropriate activation can cause unnecessary cell loss. Maintaining the correct balance is therefore essential for tissue homeostasis. This principle explains why altered apoptosis regulation is relevant to both cancer research, which examines abnormal survival, and conditions involving excessive cell loss.
Research on apoptosis regulation helps examine how tissues remove unnecessary cells during development and how immune responses eliminate cells when appropriate. The same regulatory framework can be considered across these contexts because mitochondrial stress, death-receptor signals, BCL-2 family proteins, and caspases connect cellular decisions with broader tissue balance.
These fields examine opposite or disrupted outcomes of cell-death control. Neurodegeneration research can focus on the consequences of excessive cell loss, whereas cancer research often considers the persistence of abnormal cells that evade death. Understanding pathway signals and mitochondrial decision points supports strategies intended either to restore cell death or to inhibit it when preservation is appropriate.