Category: Moms

Autophagy and cell death

Autophagy and cell death

Auhophagy Cell Sci 15 September ; 18 : jcs Autophagy and cell death are also examples in primary and transformed cells with functional apoptotic machinery where the induction of autophagy can lead to cell death. Neurol Res. N Engl J Med.

Autophagy and cell death -

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Pharmacol Res. Zhou Q, Chen B, Wang X et al Sulforaphane protects against rotenone-induced neurotoxicity in vivo: Involvement of the mTOR, Nrf2, and autophagy pathways. Download references. The authors would like to thank the senior management of Delhi Technological University for their constant support and guidance.

Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Mechanical Engineering Building, Delhi Technological University Formerly Delhi College of Engineering , Room FW4TF3, Shahbad Daulatpur, Bawana Road, Delhi, , India.

Rohan Gupta, Rashmi K. You can also search for this author in PubMed Google Scholar. RG, RK and PK conceived and designed this project. Data collected and analyzed by RG and RK. Art work is done by RG and PK. Manuscript has been written by RG and PK. Correspondence to Pravir Kumar. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Abstract Autophagy and apoptosis are two crucial self-destructive processes that maintain cellular homeostasis, which are characterized by their morphology and regulated through signal transduction mechanisms. Graphical abstract Mounting evidence demonstrated that under stress conditions, such as calcium efflux, endoplasmic reticulum stress, the ubiquitin—proteasome system, and oxidative stress intermediate molecules, namely p53 and VEGF, activate and cause cell death.

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As examples: Does autophagy directly kill cells and if so how? Is ADCD activated concurrently when cells are triggered to die via apoptosis? And is ADCD essentially a more protracted version of autosis or a distinct pathway?

The goal of this mini-review is to summarize the field and to identify some of the major gaps in our knowledge. Understanding the molecular mechanisms that mediate ADCD will not only provide new insights into development, they may facilitate the creation of better tools for both the diagnostics and treatment of disease.

The term programmed cell death PCD was coined by Lockshin and Williams to describe the precisely timed loss of skeletal muscles at the end of metamorphosis in moths. PCD plays many essential roles during both development and homeostasis.

First, it can insure the presence of the appropriate number of cells within each tissue. A general rule of embryogenesis is that many more cells are produced in each lineage than are ultimately needed to support organogenesis Raff, Cells that make a connection with appropriate partners receive a retrograde signal referred to as a trophic factor.

These cells then upregulate survival programs and persist, while their unsuccessful neighbors die during a discrete window of development. The classical example of this process is the matching of motor neurons to the muscles they innervate Hamburger, Second, targeted cell death can help sculpt the body, such as interdigital cell death in the developing limb bud to form the fingers Saunders et al.

Third, cell death can target tissues that have served an important function at one stage of development but are then no longer needed at a later stage, such as regression of the tadpole tail during amphibian metamorphosis Smith and Tata, Fourth, PCD can be used to remove deleterious cells, such as the loss of self-reactive thymocytes during negative selection in the thymus Surh and Sprent, Lastly, PCD functions as a normal component of homeostasis.

For example, we lose approximately one million cells per minute throughout life, primarily in the hematopoietic system Levine and Ucker, These cells are typically replaced by the products of stem cells, thus maintaining tissue homeostasis.

In some cases, inappropriate activation of PCD results in the loss of valuable and irreplaceable cells, thus compromising the tissue. In contrast, the failure to delete defective but mitotically-competent cells allows for their clonal expansion, which serves as the basis of most cancers and all autoimmune diseases.

Consequently, one of the major drivers of the field is the desire to identify interventions that rescue valuable but condemned cells, or alternatively, selectively target defective ones. During development, the molecules or cell-cell interactions that trigger PCD typically are not inherently toxic but instead are physiological signals that can activate a range of downstream responses, one of which may be death.

This is illustrated in amphibian metamorphosis, where a dramatic increase in the circulating levels of thyroxine simultaneously induces proliferation and differentiation in the developing limb anlagen and cell death in the tail Yaoita, However, cell death can also be provoked by external signals that do not normally function during development, such as ionizing radiation or toxins.

To address this issue, the term Accidental Cell Death ACD was introduced to identify deaths that are induced by exogenous insults, while the term Regulated Cell Death RCD was coined to capture those cell deaths that employ specific cellular machinery, independent of the upstream trigger Galluzzi et al.

Thus, while the loss of immature T cells during negative selection is a traditional example of RCD, the killing of these same cells with ionizing radiation represents ACD, even though they both lead to apoptosis Lowe et al.

PCD is still an acceptable term for those deaths that occur as a normal component of development. In addition to the three listed above, other programs include: ferroptosis, pyroptosis, necroptosis, parthanatos, entosis, mitochondrial permeability transition MPT -driven necrosis, lysosome-dependent cell death, NETotic cell death, oxytosis, and mitotic catastrophe reviewed in Galluzzi et al.

More recently, several regulated forms of necrosis have been identified, including necroptosis, pyroptosis, parthanoptosis, NETosis, MPT-driven necrosis, oxytosis, and ferroptosis, which are all dependent upon specific signaling pathways within the cell Degterev et al.

Since cytoplasmic and nuclear constituents are highly inflammatory collectively known as damage-associated molecular patterns or DAMPS , these deaths can play valuable roles by mobilizing the immune system to respond to an acute injury or infection Zindel and Kubes, In contrast, as membrane integrity is maintained during apoptosis, dying cells are typically phagocytosed and degraded by neighboring cells or macrophages, thereby precluding immunological responses.

This is obviously beneficial given the massive numbers of cells that die during development and homeostasis, since it would be disastrous for the organism to be in a chronic hyper-inflammatory state.

The discarded apoptotic bodies run out of the ATP required to maintain membrane pumps and undergo necrosis]. The best understood cell death program is apoptosis formerly type I degeneration.

This is due in part to outstanding genetic models like the nematode Caenorhabditis elegans , where the key components of the program were identified via mutational analysis Malin and Shaham, In addition, the availability of highly sensitive and reliable assays like TUNEL DNA fragmentation and Annexin V staining phosphatidylserine externalization allow for the easy detection of apoptotic cells both in vitro and in vivo Galluzzi et al.

Apoptosis is typically driven by the activation of pro-caspases, a family of cysteine-aspartic proteases that cleave a vast range of cellular proteins Julien and Wells, There are two main pathways for caspase activation- extrinsic and intrinsic reviewed in Bedoui et al.

Ligand binding to membrane death receptors like TRAIL and FAS lead to the formation of the Death-Inducing Signaling Complex DISC , and the subsequent activation of pro-caspase-8, which then activates the downstream executioner pro-caspases-3 and The intrinsic pathway is initiated when developmental or pathological signals lead to a shift in the balance between pro- and anti-apoptotic Bcl-2 family members that regulate the oligomerization of BAX and BAK.

Cytochrome c and dATP bind to apoptotic protease activating factor 1 APAF-1 to facilitate the formation of the apoptosome and the subsequent activation of the initiator caspase-9, and ultimately, the activation of executioner caspases.

The extrinsic and intrinsic pathways can be coupled via caspase-8 cleavage of the BH3-only protein Bid to form truncated Bid tBid Li et al. The best characterized form of autophagy is macroautophagy, and the two terms are often used interchangeably Other autophagic mechanisms also include microautophagy and chaperone-mediated autophagy.

Autophagy is an evolutionarily ancient process that allows cells to survive starvation and other stresses by facilitating the sequestration and degradation of bulk cytoplasm, damaged organelles like mitochondria and protein aggregates Hughes and Rusten, ; Ohsumi, ; Wanderoy et al.

The recycled amino acids and fatty acids facilitate ATP production and other essential processes. The basal levels of autophagy can be upregulated under conditions of nutrient deprivation or loss of growth factors Figure 1 ; reviewed in Cicchini et al.

These drive the formation of the phagophore, a crescent shaped double membrane structure generated from intracellular membranes. The phagophore then circularizes to form the autophagosome, which then fuses with lysosomes, resulting in the creation of the autolysosomes, where the trapped contents are degraded.

Figure 1. Signal transduction cascade regulating autophagy. Loss of growth factor stimulation or nutritional inputs like glucose lead to the activation of the ULK complex and the subsequent activation of the Class III PI3 Kinase complex.

This drives phagophore assembly and the subsequent recruitment of cellular constituents like damaged mitochondria, protein aggregates and bulk cytoplasm. The phagophore elongates and circularizes to form the autophagosome, which then docks with lysosomes. The fusion of these two organelles leads to autolysosome formation and the destruction of the enclosed cargo via lysosomal hydrolases.

Several inhibitors or genetic interventions are available that can block autophagy at key regulatory points labeled red in boxes Vakifahmetoglu-Norberg et al. Given that autophagy can be an adaptive response that helps cells survive adverse conditions, there is still a lack of clarity of if and how autophagy is part of a directed killing program.

Consequently, in order to determine that cells die via autophagy-dependent cell death ADCD , it has been proposed that three criteria must be met: 1 other forms of cell death have been excluded; 2 there is an increase in autophagic flux; and 3 genetic or pharmacological blockade of autophagy rescues the cell Shen and Codogno, ; Galluzzi et al.

Nevertheless, there are several genetic models where an absolute requirement for the autophagic machinery has been shown to be essential for cell death. From a phylogenetic perspective, perhaps the most ancient example is found in the free-living social ameba Dictyostelium discoideum Cornillon et al.

As differentiation proceeds, the stalk cells die by an autophagy-dependent pathway. Indeed, targeting the autophagy-related gene-1 Atg1 blocks death and the cells instead default to necrosis Kosta et al. The fruit fly Drosophila melanogaster also provides several well-characterized examples of autophagic cell death during metamorphosis.

The loss of the salivary glands is dependent on both apoptosis and autophagy, as genetic interference with either of these pathways represses but does not prevent cell death Martin and Baehrecke, ; Berry and Baehrecke, In contrast, the death of the gut appears to require just autophagy, as genetic inactivation or knockdown Atg1 , Atg2 or Atg18 severely delays these deaths Denton et al.

Midgut death in flies is recognized as the clearest and most convincing example of ADCD during development. There are a number of studies supporting the existence of ADCD in mammals, most notably in terminally differentiated cells like muscles and neurons, and some cancers Linder and Kögel, Perhaps the best supported examples have focused on the death of hippocampal stem cells following insulin withdrawal in vitro Yu et al.

Cells that are null for the pro-apoptotic proteins BAK and BAX, and thus incapable of initiating apoptosis provide intriguing insights into ADCD Shimizu et al. This led to the retention of otherwise condemned cells, including interdigital cells in the limb buds, thymocytes, and some neurons Arakawa et al.

These data provide strong evidence autophagy is required for PCD during normal mammalian development. Autotic cells display a dramatic increase in the number of autophagic vesicles and empty vesicles within the cytoplasm. Over time the mitochondria become electron dense, the perinuclear space balloons as the inner and outer nuclear membranes separate, and the nucleus displays concavity.

Autosis can be inhibited genetically by inactivating essential autophagy genes e. While the data presented in this review provides an overview of cell death in general, and ADCD during development in particular, there are still several major gaps in our fundamental understanding of this process Lindqvist et al.

Some of the key questions that remain unresolved are discussed below. Is ADCD widespread but masked by apoptosis? There are two possible interpretations of these data. The first is that apoptosis and ADCD are triggered concurrently, but ADCD is masked by the much faster apoptosis program Figure 2A.

Alternatively, when cells are unable to activate their primary cell death program, there is compensatory initiation of another one to ensure that condemned cells are removed.

Given the complicated cross-talk between autophagic and apoptotic proteins, such as Beclin 1 and Bcl-2 Xu and Qin, , this process is feasible but challenging to resolve reviewed in Tsapras and Nezis, Does autophagy trigger cell death indirectly? Autophagy can selectively target the destruction of key survival proteins like the inhibitor of apoptosis protein IAP BRUCE which prevents pro-caspase activation Nezis et al.

Loss of these survival proteins subsequently facilitates cell death Figure 2B. However, instead of dying with an autophagic morphology, these condemned cells die by apoptosis, necrosis, or ferroptosis respectively.

Consequently, while autophagy can derepress cell death, it does not meet the three requirements of ADCD in that the actual death process is mediated by a different program. Is ADCD a less aggressive form of autosis? A number of studies have shown a direct correlation between autosis and cell death.

Indeed, inhibition of autosis with cardiac glycosides can rescue these otherwise condemned cells Liu et al. One possibility is that autosis is just a more aggressive version of the same program that mediates ADCD during development Figure 2C.

In support of this hypothesis, knockdown of upstream autophagy regulators beclin1 , Atg13 , and Atg14 can block Tat-Beclin 1-induced cell death Liu et al.

An overlap between autosis and ADCD would offer mechanistic insights into the cell death process since autosis is accompanied by damage to organelles like mitochondria and the nucleus Liu et al. In addition, the aggressive production of intracellular vacuoles during autosis is associated with the breakdown of the Golgi complex and the endoplasmic reticulum, which depletes intracellular membranes, something that is seen in some examples of ADCD Liu and Levine, This may explain why Bafilomycin A1, which blocks lysosome fusion to autophagosomes, does not inhibit autosis Liu et al.

Collectively, these insults likely bring about the demise of the cell. However the relationship between ADCD and autosis is unclear.

It should also be noted that the morphologies associated with ADCD and autosis are distinct, although this may reflect the faster kinetics or intensity of autosis relative to the more protracted time course of ADCD.

Clearly this is an area that warrants further investigation. Figure 2. Proposed ADCD pathways. A Both apoptosis and ADCD are triggered concurrently but the speed of apoptosis masks the involvement of ADCD. B Autophagy derepresses other cell death programs.

By selectively targeting key survival proteins, compromised cells are able to activate non-autophagic cell death programs. If a cell is subjected to mild stresses, it transiently upregulates autophagy, which helps it survive the insult. However, when the cell is exposed to a cell death inducer during development, autophagy is driven past the point of no return and the cell dies.

While it has not been demonstrated unambiguously that autophagy drives cell death during development Kroemer and Levine, , there is increasing evidence that ADCD is a bonafide cell death program. Nevertheless, there are still major gaps in our understanding of this mechanism in development and pathogenesis.

In particular, ADCD appears to be an important process in neurodegeneration, cancer, and cardiology. The field will benefit greatly from the identification of the kinds of markers and inhibitors that have propelled the study of apoptosis.

The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The author would like to thank Drs. Amanda Woerman and Rachid Skouta for a critical reading of the manuscript, Ms.

Christine Brown for technical assistance, and the Eugene M. and Ronnie Isenberg Professorship Endowment for support.

The figures were created with BioRender. Alu, A. The role of lysosome in regulated necrosis. Acta Pharm. doi: PubMed Abstract CrossRef Full Text Google Scholar.

Arakawa, S. Cell Death Differ. Bedoui, S. Emerging connectivity of programmed cell death pathways and its physiological implications. Cell Biol. Berry, D. Growth arrest and autophagy are required for salivary gland cell degradation in drosophila.

Cell , — Bialik, S. Autophagy-dependent cell death - where, how and why a cell eats itself to death. Cell Sci. Bredesen, D. Programmed cell death mechanisms in neurological disease. Cicchini, M. Molecular pathways: autophagy in cancer—a matter of timing and context. Cancer Res. Clarke, P. Developmental cell death: morphological diversity and multiple mechanisms.

Google Scholar. Cornillon, S. Programmed cell death in dictyostelium. Degterev, A. Chemical inhibitor of nonapoptotic cell death with therapeutic potential for ischemic brain injury. Denton, D. Relationship between growth arrest and autophagy in midgut programmed cell death in drosophila.

Autophagy, not apoptosis, is essential for midgut cell death in drosophila.

Open access peer-reviewed deth. Submitted: 09 May Reviewed: 14 June Published: 02 August com Auutophagy Matcha green tea for relaxation. Autophagy, a degradation mechanism conserved among eukaryotes, plays an important role in cellular homeostasis by maintaining nutrients and energy balance. It is not surprising that autophagy has been associated with various pathological conditions such as neurodegeneration, aging, infection, and cancer. Lentils and Gluten-free recipes Carbohydrate metabolism and blood sugar levels Growth Andd. Autophagy and cell death are fundamental cellular processes that play critical roles in the anc and pathology of multicellular Auotphagy. Autophagy is Autophagy and cell death conserved housekeeping Autophafy utilized an cells to Augophagy homeostasis Autophagy and cell death conveying intracellular components to lysosomal compartments for degradation and recycling. Cell death can either be regulated, proceeding through precise signaling pathways or accidental resulting from unexpected cellular injury. While apoptosis is the earliest discovered regulated cell death pathway, several non-apoptotic regulated cell death pathways including pyroptosis, ferroptosis and necroptosis have gained prominence more recently. Learn more about autophagy, apoptotic cell death, and non-apoptotic cell death pathways and discover how Proteintech products can accelerate your autophagy and cell death research. Autophagy and cell death

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SDC1-dependent TGM2 Autophahy radiosensitivity in glioblastoma Joint health conditions coordinating EPG5-mediated dfath of abd with lysosomes. BNC1 Pre-workout fueling strategies ferroptosis through the NF2-YAP pathway induces primary ovarian insufficiency.

Apolipoprotein A-1 protected hepatic ischemia-reperfusion injury through suppressing macrophages pyroptosis via TLR4- NF-κB pathway. Destabilization of TP53 by USP10 is essential for neonatal autophagy and survival. Suppression of ACE2 SUMOylation protects against SARS-CoV-2 infection through TOLLIP-mediated selective autophagy.

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: Autophagy and cell death

Autophagy as a decisive process for cell death | Experimental & Molecular Medicine Nat Rev Mol Cell Biol. Developmental cell death: morphological Matcha green tea for relaxation and Autophgy mechanisms. Regulation of Nutrient-rich ingredient list by Autophaby Matcha green tea for relaxation protein celk during 1-methylphenylpyridinium-induced cell death. CAS PubMed Google Scholar Ellis HM, Horvitz HR. Mol Biol Cell Western Blot Cell Separation. This concept was first proposed in 26 and considered radical 8 but now is supported by studies demonstrating increased death in cells or organisms lacking gene products essential for autophagy Table 2.
Apoptosis, autophagy, necroptosis, and cancer metastasis | Molecular Cancer | Full Text In addition, cell death subroutines have been recently classified on the basis of mechanical and molecular aspects of cell death processes 5. CAS PubMed PubMed Central Google Scholar Geng J, Klionsky DJ. Atg1 allows second-signaled autophagic cell death in Dictyostelium. Anyone you share the following link with will be able to read this content:. This suggests the possibility that either cell survival or death may be regulated by selective autophagic clearance of cytoplasmic material. Lu JV, Walsh CM.
Autophagy and Cell Death Provided by the Springer Nature SharedIt content-sharing initiative. Table of contents alert. Shedding of NG2 by MMP Attenuates Anoikis. Bcl-2 can directly bind to Beclin Wei MC, Zong W-X, Cheng EH-Y et al Proapoptotic BAX and BAK: a requisite gateway to mitochondrial dysfunction and death.
Access this article Nat Commun — Google Scholar Suresh SN, Chakravorty A, Giridharan M et al Pharmacological tools to modulate autophagy in neurodegenerative diseases. View Metrics. The genetic signatures of noncoding RNAs. In addition, PEITC enables p53RH tumor cells to be sensitive to proteasome and autophagy-mediated degradation processes. Antitumor drugs that target cancer stem cells by regulating autophagy. CAS PubMed Google Scholar Yuan K, Xie K, Fox J, Zeng H, Gao H, Huang C, et al.
MINI REVIEW article Autophagy involves the sequestration of cytoplasmic seath by an isolation Autophagy and cell death derived from the preautophagosomal structure to Lentils and Gluten-free recipes Natural blood sugar control double-membrane vacuole, the autophagosome. Celp A, Neininger A, Aitophagy C Autoohagy al MAPKAP kinase Auto;hagy is ddath for LPS-induced TNF-α biosynthesis. JCI Insight. Yang S, Wang X, Contino G, Liesa M, Sahin E, Ying H, et al. High levels of corticosterone CORT induced by CRS cause ACD via SGK3, which has a PX domain for binding to PI3P and the initiation of autophagy. Moreover, it has been proposed that a virulence protein, SipB, of the intracellular pathogen Salmonella enterica causes macrophage death by inducing autophagy, perhaps by triggering mitochondrial fusion with autophagosomes

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