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Tregub PP, Averchuk AS, Baranich TI, Ryazanova MV, Salmina AB. Physiological and Pathological Remodeling of Cerebral Microvessels. Int J Mol Sci 2022; 23:ijms232012683. [PMID: 36293539 PMCID: PMC9603917 DOI: 10.3390/ijms232012683] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/10/2022] [Accepted: 10/18/2022] [Indexed: 11/13/2022] Open
Abstract
There is growing evidence that the remodeling of cerebral microvessels plays an important role in plastic changes in the brain associated with development, experience, learning, and memory consolidation. At the same time, abnormal neoangiogenesis, and deregulated regulation of microvascular regression, or pruning, could contribute to the pathogenesis of neurodevelopmental diseases, stroke, and neurodegeneration. Aberrant remodeling of microvesselsis associated with blood-brain barrier breakdown, development of neuroinflammation, inadequate microcirculation in active brain regions, and leads to the dysfunction of the neurovascular unit and progressive neurological deficits. In this review, we summarize current data on the mechanisms of blood vessel regression and pruning in brain plasticity and in Alzheimer's-type neurodegeneration. We discuss some novel approaches to modulating cerebral remodeling and preventing degeneration-coupled aberrant microvascular activity in chronic neurodegeneration.
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Kulbay M, Paimboeuf A, Ozdemir D, Bernier J. Review of cancer cell resistance mechanisms to apoptosis and actual targeted therapies. J Cell Biochem 2021; 123:1736-1761. [PMID: 34791699 DOI: 10.1002/jcb.30173] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 10/04/2021] [Accepted: 10/22/2021] [Indexed: 11/11/2022]
Abstract
The apoptosis pathway is a programmed cell death mechanism that is crucial for cellular and tissue homeostasis and organ development. There are three major caspase-dependent pathways of apoptosis that ultimately lead to DNA fragmentation. Cancerous cells are known to highly regulate the apoptotic pathway and its role in cancer hallmark acquisition has been discussed over the past decades. Numerous mutations in cancer cell types have been reported to be implicated in chemoresistance and treatment outcome. In this review, we summarize the mutations of the caspase-dependant apoptotic pathways that are the source of cancer development and the targeted therapies currently available or in trial.
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Affiliation(s)
- Merve Kulbay
- INRS - Centre Armand-Frappier Santé Biotechnologie, Laval, Quebec, Canada.,Department of Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - Adeline Paimboeuf
- INRS - Centre Armand-Frappier Santé Biotechnologie, Laval, Quebec, Canada
| | - Derman Ozdemir
- Department of Medicine, One Brooklyn Health-Brookdale Hospital Medical Center, Brooklyn, New York, USA
| | - Jacques Bernier
- INRS - Centre Armand-Frappier Santé Biotechnologie, Laval, Quebec, Canada
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Kulbay M, Bernier-Parker N, Bernier J. The role of the DFF40/CAD endonuclease in genomic stability. Apoptosis 2021; 26:9-23. [PMID: 33387146 DOI: 10.1007/s10495-020-01649-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2020] [Indexed: 12/18/2022]
Abstract
Maintenance of genomic stability in cells is primordial for cellular integrity and protection against tumor progression. Many factors such as ultraviolet light, oxidative stress, exposure to chemical reagents, particularly mutagens and radiation, can alter the integrity of the genome. Thus, human cells are equipped with many mechanisms that prevent these irreversible lesions in the genome, as DNA repair pathways, cell cycle checkpoints, and telomeric function. These mechanisms activate cellular apoptosis to maintain DNA stability. Emerging studies have proposed a new protein in the maintenance of genomic stability: the DNA fragmentation factor (DFF). The DFF40 is an endonuclease responsible of the oligonucleosomal fragmentation of the DNA during apoptosis. The lack of DFF in renal carcinoma cells induces apoptosis without oligonucleosomal fragmentation, which poses a threat to genetic information transfer between cancerous and healthy cells. In this review, we expose the link between the DFF and genomic instability as the source of disease development.
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Affiliation(s)
- Merve Kulbay
- INRS - Centre Armand-Frappier-Santé-Biotechnologie, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada.,Department of Medicine, Université de Montréal, 2900 Blvd. Edouard Montpetit, Montreal, QC, Canada
| | - Nathan Bernier-Parker
- Toronto Animal Health Partners Emergency and Specialty Hospital, 1 Scarsdale Road, North York, ON, M3B 2R2, Canada
| | - Jacques Bernier
- INRS - Centre Armand-Frappier-Santé-Biotechnologie, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada.
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Mahajan SD, Tutino VM, Redae Y, Meng H, Siddiqui A, Woodruff TM, Jarvis JN, Hennon T, Schwartz S, Quigg RJ, Alexander JJ. C5a induces caspase-dependent apoptosis in brain vascular endothelial cells in experimental lupus. Immunology 2016; 148:407-19. [PMID: 27213693 DOI: 10.1111/imm.12619] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 05/06/2016] [Accepted: 05/10/2016] [Indexed: 12/18/2022] Open
Abstract
Blood-brain barrier (BBB) dysfunction complicates central nervous system lupus, an important aspect of systemic lupus erythematosus. To gain insight into the underlying mechanism, vascular corrosion casts of brain were generated from the lupus mouse model, MRL/lpr mice and the MRL/MpJ congenic controls. Scanning electron microscopy of the casts showed loss of vascular endothelial cells in lupus mice compared with controls. Immunostaining revealed a significant increase in caspase 3 expression in the brain vascular endothelial cells, which suggests that apoptosis could be an important mechanism causing cell loss, and thereby loss of BBB integrity. Complement activation occurs in lupus resulting in increased generation of circulating C5a, which caused the endothelial layer to become 'leaky'. In this study, we show that C5a and lupus serum induced apoptosis in cultured human brain microvascular endothelial cells (HBMVECs), whereas selective C5a receptor 1 (C5aR1) antagonist reduced apoptosis in these cells, demonstrating C5a/C5aR1-dependence. Gene expression of initiator caspases, caspase 1 and caspase 8, and pro-apoptotic proteins death-associated protein kinase 1, Fas-associated protein (FADD), cell death-inducing DNA fragmentation factor 45 000 MW subunit A-like effector B (CIDEB) and BCL2-associated X protein were increased in HBMVECs treated with lupus serum or C5a, indicating that both the intrinsic and extrinsic apoptotic pathways could be critical mediators of brain endothelial cell apoptosis in this setting. Overall, our findings suggest that C5a/C5aR1 signalling induces apoptosis through activation of FADD, caspase 8/3 and CIDEB in brain endothelial cells in lupus. Further elucidation of the underlying apoptotic mechanisms mediating the reduced endothelial cell number is important in establishing the potential therapeutic effectiveness of C5aR1 inhibition that could prevent and/or reduce BBB alterations and preserve the physiological function of BBB in central nervous system lupus.
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Affiliation(s)
| | - Vincent M Tutino
- Toshiba Vascular Stroke Center, Biomedical Engineering Department, University at Buffalo, Buffalo, NY, USA
| | - Yonas Redae
- Department of Medicine, University at Buffalo, Buffalo, NY, USA
| | - Hui Meng
- Toshiba Vascular Stroke Center, Biomedical Engineering Department, University at Buffalo, Buffalo, NY, USA
| | - Adnan Siddiqui
- Toshiba Vascular Stroke Center, Biomedical Engineering Department, University at Buffalo, Buffalo, NY, USA
| | - Trent M Woodruff
- School of Biomedical Sciences, University of Queensland, St Lucia, QLD, Australia
| | - James N Jarvis
- Department of Pediatrics, University at Buffalo, Buffalo, NY, USA
| | - Teresa Hennon
- Department of Pediatrics, University at Buffalo, Buffalo, NY, USA
| | | | - Richard J Quigg
- Department of Medicine, University at Buffalo, Buffalo, NY, USA
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Iglesias-Guimarais V, Gil-Guiñon E, Sánchez-Osuna M, Casanelles E, García-Belinchón M, Comella JX, Yuste VJ. Chromatin collapse during caspase-dependent apoptotic cell death requires DNA fragmentation factor, 40-kDa subunit-/caspase-activated deoxyribonuclease-mediated 3'-OH single-strand DNA breaks. J Biol Chem 2013; 288:9200-15. [PMID: 23430749 DOI: 10.1074/jbc.m112.411371] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Apoptotic nuclear morphology and oligonucleosomal double-strand DNA fragments (also known as DNA ladder) are considered the hallmarks of apoptotic cell death. From a classic point of view, these two processes occur concomitantly. Once activated, DNA fragmentation factor, 40-kDa subunit (DFF40)/caspase-activated DNase (CAD) endonuclease hydrolyzes the DNA into oligonucleosomal-size pieces, facilitating the chromatin package. However, the dogma that the apoptotic nuclear morphology depends on DNA fragmentation has been questioned. Here, we use different cellular models, including MEF CAD(-/-) cells, to unravel the mechanism by which DFF40/CAD influences chromatin condensation and nuclear collapse during apoptosis. Upon apoptotic insult, SK-N-AS cells display caspase-dependent apoptotic nuclear alterations in the absence of internucleosomal DNA degradation. The overexpression of a wild-type form of DFF40/CAD endonuclease, but not of different catalytic-null mutants, restores the cellular ability to degrade the chromatin into oligonucleosomal-length fragments. We show that apoptotic nuclear collapse requires a 3'-OH endonucleolytic activity even though the internucleosomal DNA degradation is impaired. Moreover, alkaline unwinding electrophoresis and In Situ End-Labeling (ISEL)/In Situ Nick Translation (ISNT) assays reveal that the apoptotic DNA damage observed in the DNA ladder-deficient SK-N-AS cells is characterized by the presence of single-strand nicks/breaks. Apoptotic single-strand breaks can be impaired by DFF40/CAD knockdown, abrogating nuclear collapse and disassembly. In conclusion, the highest order of chromatin compaction observed in the later steps of caspase-dependent apoptosis relies on DFF40/CAD-mediated DNA damage by generating 3'-OH ends in single-strand rather than double-strand DNA nicks/breaks.
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Affiliation(s)
- Victoria Iglesias-Guimarais
- Cell Death, Senescence, and Survival Group, Departament de Bioquímica i Biologia Molecular and Institut de Neurociències, Facultat de Medicina, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
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