Related Experiment Video
Updated: Jun 4, 2026
09:10
siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
Published on: October 28, 2019
The Beclin 1 network regulates autophagy and apoptosis
1Department of Surgery, Hillman Cancer Center, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA, USA.
Cell Death and Differentiation
|February 12, 2011
Summary
Beclin 1 is crucial for autophagy, a cell survival process. Its regulation by interactions and modifications influences cellular homeostasis and disease, impacting cancer and neurodegeneration.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Beclin 1 is a key regulator of autophagy, a cellular process vital for survival during stress.
- It forms complexes with cofactors to modulate the Vps-34 lipid kinase, initiating autophagy.
- Beclin 1's function is also controlled by interactions with Bcl-2/Bcl-XL and post-translational modifications.
Purpose of the Study:
- To review recent findings on the Beclin 1 network.
- To elucidate the role of Beclin 1 in maintaining cellular homeostasis.
- To focus on the interplay between apoptosis and autophagy regulated by Beclin 1.
Main Methods:
- Literature review of Beclin 1 interactions and functions.
- Analysis of Beclin 1's role in cellular homeostasis.
- Examination of the cross-regulation between apoptosis and autophagy pathways.
Main Results:
- Beclin 1 orchestrates autophagy through interactions with multiple cofactors and regulation of the Vps-34 complex.
- Inhibitory binding by Bcl-2/Bcl-XL and regulatory modifications like phosphorylation and ubiquitination fine-tune Beclin 1 activity.
- Caspase-mediated cleavage of Beclin 1 links autophagy and apoptosis, suggesting a crosstalk mechanism.
Conclusions:
- The Beclin 1 network is central to cellular homeostasis, integrating signals for autophagy.
- Dysregulation of Beclin 1 is implicated in diseases such as cancer and neurodegeneration.
- Understanding Beclin 1's regulatory network offers insights into therapeutic strategies for related disorders.
Related Concept Videos
01:31The Intrinsic Apoptotic Pathway
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...
01:18Autophagic Cell Death
Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
01:22Cellular Injury V: Apoptosis and Autophagy
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...
01:17The Extrinsic Apoptotic Pathway
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...
01:36Delivery Pathways to the Lysosome
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
01:27Autophagy
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...