1
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Chu Y, Hua Y, He L, He J, Chen Y, Yang J, Mahmoud I, Zeng F, Zeng X, Benavides GA, Darley-Usmar VM, Young ME, Ballinger SW, Prabhu SD, Zhang C, Xie M. β-hydroxybutyrate administered at reperfusion reduces infarct size and preserves cardiac function by improving mitochondrial function through autophagy in male mice. J Mol Cell Cardiol 2024; 186:31-44. [PMID: 37979443 PMCID: PMC11094739 DOI: 10.1016/j.yjmcc.2023.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/20/2023] [Accepted: 11/03/2023] [Indexed: 11/20/2023]
Abstract
Ischemia/reperfusion (I/R) injury after revascularization contributes ∼50% of infarct size and causes heart failure, for which no established clinical treatment exists. β-hydroxybutyrate (β-OHB), which serves as both an energy source and a signaling molecule, has recently been reported to be cardioprotective when administered immediately before I/R and continuously after reperfusion. This study aims to determine whether administering β-OHB at the time of reperfusion with a single dose can alleviate I/R injury and, if so, to define the mechanisms involved. We found plasma β-OHB levels were elevated during ischemia in STEMI patients, albeit not to myocardial protection level, and decreased after revascularization. In mice, compared with normal saline, β-OHB administrated at reperfusion reduced infarct size (by 50%) and preserved cardiac function, as well as activated autophagy and preserved mtDNA levels in the border zone. Our treatment with one dose β-OHB reached a level achievable with fasting and strenuous physical activity. In neonatal rat ventricular myocytes (NRVMs) subjected to I/R, β-OHB at physiologic level reduced cell death, increased autophagy, preserved mitochondrial mass, function, and membrane potential, in addition to attenuating reactive oxygen species (ROS) levels. ATG7 knockdown/knockout abolished the protective effects of β-OHB observed both in vitro and in vivo. Mechanistically, β-OHB's cardioprotective effects were associated with inhibition of mTOR signaling. In conclusion, β-OHB, when administered at reperfusion, reduces infarct size and maintains mitochondrial homeostasis by increasing autophagic flux (potentially through mTOR inhibition). Since β-OHB has been safely tested in heart failure patients, it may be a viable therapeutic to reduce infarct size in STEMI patients.
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Affiliation(s)
- Yuxin Chu
- National Key Laboratory for Innovation and Transformation of Luobing Theory, The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, Department of Cardiology, Qilu Hospital of Shandong University, Jinan, China; Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Yutao Hua
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Lihao He
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Jin He
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Yunxi Chen
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Jing Yang
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Ismail Mahmoud
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Fanfang Zeng
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA; Department of Cardiovascular Disease, Fuwai Hospital Chinese Academy of Medical Sciences Shenzhen, Shenzhen 518020, China
| | - Xiaochang Zeng
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA; Department of Cardiovascular Disease, Fuwai Hospital Chinese Academy of Medical Sciences Shenzhen, Shenzhen 518020, China
| | - Gloria A Benavides
- Department of Pathology, Division of Molecular and Cellular Pathology, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Victor M Darley-Usmar
- Department of Pathology, Division of Molecular and Cellular Pathology, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Martin E Young
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Scott W Ballinger
- Department of Pathology, Division of Molecular and Cellular Pathology, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Sumanth D Prabhu
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Cheng Zhang
- National Key Laboratory for Innovation and Transformation of Luobing Theory, The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, Department of Cardiology, Qilu Hospital of Shandong University, Jinan, China.
| | - Min Xie
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35233, USA.
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2
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Fan J, Chen C, Zhong Y. A cohort study on IVF outcomes in infertile endometriosis patients: the effects of rapamycin treatment. Reprod Biomed Online 2024; 48:103319. [PMID: 37914557 DOI: 10.1016/j.rbmo.2023.103319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/18/2023] [Accepted: 07/25/2023] [Indexed: 11/03/2023]
Abstract
RESEARCH QUESTION Can rapamycin, used as an anti-senescence drug before IVF cycles, improve the IVF outcomes of women with endometriosis by reducing oxidative stress and senescence? DESIGN This retrospective analysis involved 168 endometriosis patients undergoing two successive IVF cycles. The treatment group (n = 80) received 3 months of rapamycin before the second IVF cycle, while the non-treatment group (n = 88) had no adjuvant treatment. The first and second IVF cycles were compared between and within groups. Follicular fluid from both IVF cycles (treatment group n = 28, non-treatment group n = 32) were tested for senescence-associated and oxidative stress-related markers. RESULTS Comparing the follicular fluid from the second cycles, the rapamycin treatment group showed decreased markers of oxidative stress (8-hydroxydesoxyguanosine, malondialdehyde) and increased antioxidant markers (superoxidase dismutase, glutathione peroxidase) (all P < 0.001); the expression of senescence-related markers p16 and p21 was also significantly lower in the treatment group than in the non-treatment group (P < 0.001). Comparing the second IVF cycles, the treatment group needed fewer days of ovarian stimulation, with increased numbers of oocytes obtained and mature oocytes compared with the non-treatment group (all P < 0.001). Furthermore, rates of fertilization, implantation and clinical pregnancy were significantly higher in the treatment group (P = 0.008, 0.034 and 0.038 respectively), as was the live birth rate (P = 0.003). No structural abnormalities were seen in fetuses born to women treated with rapamycin. CONCLUSIONS This study suggested an association between short-term rapamycin treatment and improved pregnancy outcomes via IVF. This result needs to be further investigated in prospective randomized controlled clinical trials.
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Affiliation(s)
- Jiao Fan
- Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
| | - Cuina Chen
- Dongguan Donghua Hospital, Dongguan, China
| | - Yiping Zhong
- The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
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3
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You H, An G, Lee H, Lim W, Song G. Bifenox induces programmed cell death in bovine mammary epithelial cells by impairing calcium homeostasis, triggering ER stress, and altering the signaling cascades of PI3K/AKT and MAPK. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 196:105626. [PMID: 37945260 DOI: 10.1016/j.pestbp.2023.105626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 09/11/2023] [Accepted: 09/14/2023] [Indexed: 11/12/2023]
Abstract
Bifenox (methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate), a nitrophenyl ether herbicide, was first introduced in the 1980s to control broadleaf weeds. As a result of its wide and frequent application in diverse agricultural settings and reports on residual traces, potential adverse effects of bifenox have been studied extensively in rat hepatocytes, bovine peripheral lymphocytes, and mice. Despite the reported risks of bifenox exposure in dairy cows, the toxicity of bifenox on bovine lactation system has not been extensively investigated. Therefore, we used bovine mammary epithelial (MAC-T) cells to study the toxic effects of bifenox on mammary glands. We found that bifenox inhibited MAC-T cells proliferation and disturbed the cell cycle, especially in the sub-G1 and G1 phases. Bifenox also disrupted the calcium homeostasis within the cell and impaired mitochondrial membrane potential. We also examined phosphoinositide 3-kinase/protein kinase B (PI3K/AKT) and mitogen-activated protein kinase (MAPK) signaling cascades. The findings indicated hyperactivation of phosphorylated protein kinase B (AKT), p70 ribosomal S6 kinase (p70S6K), S6, extracellular signal-regulated kinases 1 and 2 (ERK1/2), p38, c-Jun N-terminal kinase (JNK), and c-Jun, as well as endoplasmic reticulum (ER) stress caused by bifenox treatment. In conclusion, based on our in vitro study employing MAC-T cells, we report that bifenox can induce damage to the bovine mammary glands, potentially impacting milk production.
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Affiliation(s)
- Hakyoung You
- Institute of Animal Molecular Biotechnology and Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Garam An
- Institute of Animal Molecular Biotechnology and Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Hojun Lee
- Institute of Animal Molecular Biotechnology and Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Whasun Lim
- Department of Biological Sciences, Sungkyunkwan University, Suwon 16419, Republic of Korea.
| | - Gwonhwa Song
- Institute of Animal Molecular Biotechnology and Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
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4
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Sienkiewicz M, Sroka K, Binienda A, Jurk D, Fichna J. A new face of old cells: An overview about the role of senescence and telomeres in inflammatory bowel diseases. Ageing Res Rev 2023; 91:102083. [PMID: 37802318 DOI: 10.1016/j.arr.2023.102083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 10/01/2023] [Accepted: 10/02/2023] [Indexed: 10/08/2023]
Abstract
Cellular senescence is a pivotal factor contributing to aging and the pathophysiology of age-related diseases. Despite the presence of inflammation and abnormal immune system function in both inflammatory bowel diseases (IBD) and senescence, the relationship between the two remains largely unexplored. Therefore, our study aimed to investigate the intricate connection between cellular senescence, telomeres, and IBD. The review highlights the presence of senescence markers, particularly p16 and p21, in IBD patients, suggesting their potential association with disease progression and mucosal inflammation. We emphasize the critical role of macrophages in eliminating senescent cells and how disturbance in effective clearance may contribute to persistent senescence and inflammation in IBD. Additionally, we shed light on the involvement of telomeres in IBD, as their dysfunction impairs enterocyte function and disrupts colonic barrier integrity, potentially exacerbating the pathogenesis of the disease. Targeting senescence and telomere dysfunctions holds promise for the development of innovative therapeutic approaches to mitigate intestinal inflammation and alleviate symptoms in IBD patients. By unraveling the precise role of senescence in IBD, we can pave the way for the discovery of novel therapeutic interventions that effectively address the underlying mechanisms of intestinal inflammation, offering hope for improved management and treatment of IBD patients.
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Affiliation(s)
- Michał Sienkiewicz
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - Kamila Sroka
- Department of Family Medicine and Public Health, University of Opole, Opole, Poland
| | - Agata Binienda
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - Diana Jurk
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA; Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Jakub Fichna
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland; Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA.
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5
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Witham MD, Granic A, Miwa S, Passos JF, Richardson GD, Sayer AA. New Horizons in cellular senescence for clinicians. Age Ageing 2023; 52:afad127. [PMID: 37466640 PMCID: PMC10355181 DOI: 10.1093/ageing/afad127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Indexed: 07/20/2023] Open
Abstract
Cellular senescence has emerged as a fundamental biological mechanism underpinning the ageing process and has been implicated in the pathogenesis of an increasing number of age-related conditions. Cellular senescence is a cell fate originally defined as an irreversible loss of replicative potential although it is now clear that it can be induced by a variety of mechanisms independent of replication and telomere attrition. The drivers include a persistent DNA damage response causing multiple alterations in cellular function. Senescent cells secrete a range of mediators that drive chronic inflammation and can convert other cells to the senescent state-the senescence-associated secretory phenotype. Much research to date has been conducted in animal models, but it is now clear that senescent cells accompany ageing in humans and their presence is an important driver of disease across systems. Proof-of-concept work suggests that preventing or reversing senescence may be a viable strategy to counteract human ageing and age-related disease. Possible interventions include exercise, nutrition and senolytics/senostatic drugs although there are a number of potential limitations to the use of senotherapeutics. These interventions are generally tested for single-organ conditions, but the real power of this approach is the potential to tackle multiple age-related conditions. The litmus test for this exciting new class of therapies, however, will be whether they can improve healthy life expectancy rather than merely extending lifespan. The outcomes measured in clinical studies need to reflect these aims if senotherapeutics are to gain the trust of clinicians, patients and the public.
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Affiliation(s)
- Miles D Witham
- AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle upon Tyne Hospitals NHS Foundation Trust, Cumbria, Northumberland, Tyne and Wear NHS Foundation Trust and Newcastle University, Newcastle, UK
| | - Antoneta Granic
- AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle upon Tyne Hospitals NHS Foundation Trust, Cumbria, Northumberland, Tyne and Wear NHS Foundation Trust and Newcastle University, Newcastle, UK
| | - Satomi Miwa
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Joao F Passos
- Department of Physiology and Biomedical Engineering and Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Gavin D Richardson
- Vascular Medicine and Biology Theme, Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Avan A Sayer
- AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle upon Tyne Hospitals NHS Foundation Trust, Cumbria, Northumberland, Tyne and Wear NHS Foundation Trust and Newcastle University, Newcastle, UK
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6
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Liu L, Yue X, Sun Z, Hambright WS, Wei J, Li Y, Matre P, Cui Y, Wang Z, Rodney G, Huard J, Robbins PD, Mu X. Reduction of senescent fibro-adipogenic progenitors in progeria-aged muscle by senolytics rescues the function of muscle stem cells. J Cachexia Sarcopenia Muscle 2022; 13:3137-3148. [PMID: 36218080 PMCID: PMC9745459 DOI: 10.1002/jcsm.13101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 08/22/2022] [Accepted: 09/10/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Fibro-adipogenic progenitors (FAPs) in the muscles have been found to interact closely with muscle progenitor/stem cells (MPCs) and facilitate muscle regeneration at normal conditions. However, it is not clear how FAPs may interact with MPCs in aged muscles. Senolytics have been demonstrated to selectively eliminate senescent cells and generate therapeutic benefits on ageing and multiple age-related disease models. METHODS By studying the muscles and primary cells of age matched WT mice and Zmpste24-/- (Z24-/- ) mice, an accelerated ageing model for Hutchinson-Gilford progeria syndrome (HGPS), we examined the interaction between FAPs and MPCs in progeria-aged muscle, and the potential effect of senolytic drug fisetin in removing senescent FAPs and improving the function of MPCs. RESULTS We observed that, compared with muscles of WT mice, muscles of Z24-/- mice contained a significantly increased number of FAPs (2.4-fold; n > =6, P < 0.05) and decreased number of MPCs (2.8-fold; n > =6, P < 0.05). FAPs isolated from Z24-/- muscle contained about 44% SA-β-gal+ senescent cells, in contrast to about 3.5% senescent cells in FAPs isolated from WT muscle (n > =6, P < 0.001). The co-culture of Z24-/- FAPs with WT MPCs resulted in impaired proliferation and myogenesis potential of WT MPCs, with the number of BrdU positive proliferative cells being reduced for 3.3 times (n > =6, P < 0.001) and the number of myosin heavy chain (MHC)-positive myotubes being reduced for 4.5 times (n > =6, P < 0.001). The treatment of the in vitro co-culture system of Z24-/- FAPs and WT MPCs with the senolytic drug fisetin led to increased apoptosis of Z24-/- FAPs (14.5-fold; n > =6, P < 0.001) and rescued the impaired function of MPCs by increasing the number of MHC-positive myotubes for 3.1 times (n > =6, P < 0.001). Treatment of Z24-/- mice with fisetin in vivo was effective in reducing the number of senescent FAPs (2.2-fold, n > =6, P < 0.05) and restoring the number of muscle stem cells (2.6-fold, n > =6, P < 0.05), leading to improved muscle pathology in Z24-/- mice. CONCLUSIONS These results indicate that the application of senolytics in the progeria-aged muscles can be an efficient strategy to remove senescent cells, including senescent FAPs, which results in improved function of muscle progenitor/stem cells. The senescent FAPs can be a potential novel target for therapeutic treatment of progeria ageing related muscle diseases.
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Affiliation(s)
- Lei Liu
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - Xianlin Yue
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - Zewei Sun
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - William S. Hambright
- Center for Regenerative Sports MedicineSteadman Philippon Research InstituteVailCOUSA
| | - Jianming Wei
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - Ying Li
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - Polina Matre
- University of Texas Health Science Center at HoustonHoustonTXUSA
| | - Yan Cui
- University of Texas Health Science Center at HoustonHoustonTXUSA
| | - Zhihui Wang
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
| | - George Rodney
- Department of Molecular Physiology and BiophysicsBaylor College of MedicineHoustonTXUSA
| | - Johnny Huard
- Center for Regenerative Sports MedicineSteadman Philippon Research InstituteVailCOUSA
| | - Paul D. Robbins
- Department of Biochemistry, Molecular Biology and Biophysics, Institute on the Biology of Aging and MetabolismUniversity of MinnesotaMinneapolisMNUSA
| | - Xiaodong Mu
- School of Pharmacy and Pharmaceutical ScienceShandong First Medical University & Shandong Academy of Medical SciencesJinanShandongChina
- Center for Regenerative Sports MedicineSteadman Philippon Research InstituteVailCOUSA
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7
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Feng W, Liu Z, Xia L, Chen M, Dai X, Huang H, Dong C, He Y, Chen Y. A Sonication‐Activated Valence‐Variable Sono‐Sensitizer/Catalyst for Autography Inhibition/Ferroptosis‐Induced Tumor Nanotherapy. Angew Chem Int Ed Engl 2022; 61:e202212021. [DOI: 10.1002/anie.202212021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Wei Feng
- Materdicine Lab School of Life Sciences Shanghai University Shanghai 200444 P. R. China
- School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China
| | - Zhonglong Liu
- Department of Oral Maxillofacial & Head and Neck Oncology Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine National Center of Stomatology National Clinical Research Center for Oral Disease 200023 Shanghai P. R. China
| | - Lili Xia
- School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China
| | - Meng Chen
- Materdicine Lab School of Life Sciences Shanghai University Shanghai 200444 P. R. China
| | - Xinyue Dai
- Materdicine Lab School of Life Sciences Shanghai University Shanghai 200444 P. R. China
| | - Hui Huang
- School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China
| | - Caihong Dong
- Department of Ultrasound Zhongshan Hospital Fudan University, and Shanghai Institute of Medical Imaging Shanghai 200032 P. R. China
| | - Yue He
- Department of Oral Maxillofacial & Head and Neck Oncology Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine National Center of Stomatology National Clinical Research Center for Oral Disease 200023 Shanghai P. R. China
| | - Yu Chen
- Materdicine Lab School of Life Sciences Shanghai University Shanghai 200444 P. R. China
- School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China
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8
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Primmer SR, Liao CY, Kummert OMP, Kennedy BK. Lamin A to Z in normal aging. Aging (Albany NY) 2022; 14:8150-8166. [PMID: 36260869 DOI: 10.18632/aging.204342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 08/31/2022] [Indexed: 11/25/2022]
Abstract
Almost since the discovery that mutations in the LMNA gene, encoding the nuclear structure components lamin A and C, lead to Hutchinson-Gilford progeria syndrome, people have speculated that lamins may have a role in normal aging. The most common HPGS mutation creates a splice variant of lamin A, progerin, which promotes accelerated aging pathology. While some evidence exists that progerin accumulates with normal aging, an increasing body of work indicates that prelamin A, a precursor of lamin A prior to C-terminal proteolytic processing, accumulates with age and may be a driver of normal aging. Prelamin A shares properties with progerin and is also linked to a rare progeroid disease, restrictive dermopathy. Here, we describe mechanisms underlying changes in prelamin A with aging and lay out the case that this unprocessed protein impacts normative aging. This is important since intervention strategies can be developed to modify this pathway as a means to extend healthspan and lifespan.
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Affiliation(s)
| | - Chen-Yu Liao
- The Buck Institute for Research on Aging, Novato, CA 94945, USA
| | | | - Brian K Kennedy
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Centre for Healthy Longevity, National University Health System, Singapore.,Departments of Biochemistry and Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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9
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Doolittle WKL, Park S, Lee SG, Jeong S, Lee G, Ryu D, Schoonjans K, Auwerx J, Lee J, Jo YS. Non-genomic activation of the AKT-mTOR pathway by the mitochondrial stress response in thyroid cancer. Oncogene 2022; 41:4893-4904. [PMID: 36195659 DOI: 10.1038/s41388-022-02484-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 09/18/2022] [Accepted: 09/22/2022] [Indexed: 11/09/2022]
Abstract
Cancer progression is associated with metabolic reprogramming and causes significant intracellular stress; however, the mechanisms that link cellular stress and growth signalling are not fully understood. Here, we identified a mechanism that couples the mitochondrial stress response (MSR) with tumour progression. We demonstrated that the MSR is activated in a significant proportion of human thyroid cancers via the upregulation of heat shock protein D family members and the mitokine, growth differentiation factor 15. Our study also revealed that MSR triggered AKT/S6K signalling by activating mTORC2 via activating transcription factor 4/sestrin 2 activation whilst promoting leucine transporter and nutrient-induced mTORC1 activation. Importantly, we found that an increase in mtDNA played an essential role in MSR-induced mTOR activation and that crosstalk between MYC and MSR potentiated mTOR activation. Together, these findings suggest that the MSR could be a predictive marker for aggressive human thyroid cancer as well as a useful therapeutic target.
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Affiliation(s)
- Woo Kyung Lee Doolittle
- Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA.,Department of Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Sunmi Park
- Department of Internal Medicine, Open NBI Convergence Technology Research Laboratory, Yonsei University College of Medicine, Seoul, 03722, South Korea
| | - Seul Gi Lee
- Department of Surgery, Eulji University School of Medicine, Daejeon, 34824, South Korea
| | - Seonhyang Jeong
- Department of Internal Medicine, Open NBI Convergence Technology Research Laboratory, Yonsei University College of Medicine, Seoul, 03722, South Korea
| | - Gibbeum Lee
- Department of Surgery, Open NBI Convergence Technology Research Laboratory, Yonsei Cancer Center, Severance Hospital, Yonsei University College of Medicine, Seoul, 03722, South Korea
| | - Dongryeol Ryu
- Laboratory of Molecular and Integrative Biology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Kristina Schoonjans
- Laboratory of Metabolic Signaling, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Johan Auwerx
- Laboratory of Integrative Systems Physiology, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Jandee Lee
- Department of Surgery, Open NBI Convergence Technology Research Laboratory, Yonsei Cancer Center, Severance Hospital, Yonsei University College of Medicine, Seoul, 03722, South Korea.
| | - Young Suk Jo
- Department of Internal Medicine, Open NBI Convergence Technology Research Laboratory, Yonsei University College of Medicine, Seoul, 03722, South Korea.
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10
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Gu X, Wang W, Yang Y, Lei Y, Liu D, Wang X, Wu T. The Effect of Metabolites on Mitochondrial Functions in the Pathogenesis of Skeletal Muscle Aging. Clin Interv Aging 2022; 17:1275-1295. [PMID: 36033236 PMCID: PMC9416380 DOI: 10.2147/cia.s376668] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 08/11/2022] [Indexed: 11/23/2022] Open
Abstract
Sarcopenia is an age-related systemic disease characterized by skeletal muscle aging that generally severely affects the quality of life of elderly patients. Metabolomics analysis is a powerful tool for qualitatively and quantitatively characterizing the small molecule metabolomics of various biological matrices in order to clarify all key scientific problems concerning cell metabolism. The discovery of optimal therapy requires a thorough understanding of the cellular metabolic mechanism of skeletal muscle aging. In this review, the relationship between skeletal muscle mitochondria, amino acid, vitamin, lipid, adipokines, intestinal microbiota and vascular microenvironment has been separately reviewed from the perspective of metabolomics, and a new therapeutic direction has been suggested.
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Affiliation(s)
- Xuchao Gu
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Wenhao Wang
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Yijing Yang
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Yiming Lei
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Dehua Liu
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Xiaojun Wang
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
| | - Tao Wu
- Department of Traditional Chinese Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, People's Republic of China
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11
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Miwa S, Kashyap S, Chini E, von Zglinicki T. Mitochondrial dysfunction in cell senescence and aging. J Clin Invest 2022; 132:158447. [PMID: 35775483 PMCID: PMC9246372 DOI: 10.1172/jci158447] [Citation(s) in RCA: 256] [Impact Index Per Article: 128.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Mitochondrial dysfunction and cell senescence are hallmarks of aging and are closely interconnected. Mitochondrial dysfunction, operationally defined as a decreased respiratory capacity per mitochondrion together with a decreased mitochondrial membrane potential, typically accompanied by increased production of oxygen free radicals, is a cause and a consequence of cellular senescence and figures prominently in multiple feedback loops that induce and maintain the senescent phenotype. Here, we summarize pathways that cause mitochondrial dysfunction in senescence and aging and discuss the major consequences of mitochondrial dysfunction and how these consequences contribute to senescence and aging. We also highlight the potential of senescence-associated mitochondrial dysfunction as an antiaging and antisenescence intervention target, proposing the combination of multiple interventions converging onto mitochondrial dysfunction as novel, potent senolytics.
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Affiliation(s)
- Satomi Miwa
- Newcastle University Biosciences Institute, Ageing Biology Laboratories, Newcastle upon Tyne, United Kingdom
| | - Sonu Kashyap
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, Florida, USA.,Signal Transduction and Molecular Nutrition Laboratory, Kogod Aging Center, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota, USA
| | - Eduardo Chini
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, Florida, USA.,Signal Transduction and Molecular Nutrition Laboratory, Kogod Aging Center, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota, USA
| | - Thomas von Zglinicki
- Newcastle University Biosciences Institute, Ageing Biology Laboratories, Newcastle upon Tyne, United Kingdom
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12
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Guerrero-Navarro L, Jansen-Dürr P, Cavinato M. Age-Related Lysosomal Dysfunctions. Cells 2022; 11:cells11121977. [PMID: 35741106 PMCID: PMC9221958 DOI: 10.3390/cells11121977] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/10/2022] [Accepted: 06/16/2022] [Indexed: 12/10/2022] Open
Abstract
Organismal aging is normally accompanied by an increase in the number of senescent cells, growth-arrested metabolic active cells that affect normal tissue function. These cells present a series of characteristics that have been studied over the last few decades. The damage in cellular organelles disbalances the cellular homeostatic processes, altering the behavior of these cells. Lysosomal dysfunction is emerging as an important factor that could regulate the production of inflammatory molecules, metabolic cellular state, or mitochondrial function.
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Affiliation(s)
- Lena Guerrero-Navarro
- Institute for Biomedical Aging Research, Universität Innsbruck, 6020 Innsbruck, Austria; (L.G.-N.); (P.J.-D.)
- Center for Molecular Biosciences Innsbruck, Innrain 58, 6020 Innsbruck, Austria
| | - Pidder Jansen-Dürr
- Institute for Biomedical Aging Research, Universität Innsbruck, 6020 Innsbruck, Austria; (L.G.-N.); (P.J.-D.)
- Center for Molecular Biosciences Innsbruck, Innrain 58, 6020 Innsbruck, Austria
| | - Maria Cavinato
- Institute for Biomedical Aging Research, Universität Innsbruck, 6020 Innsbruck, Austria; (L.G.-N.); (P.J.-D.)
- Center for Molecular Biosciences Innsbruck, Innrain 58, 6020 Innsbruck, Austria
- Correspondence:
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13
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Nacarelli T, Azar A, Potnis M, Johannes G, Mell J, Johnson FB, Brown-Borg H, Nogouchi E, Sell C. The methyltransferase enzymes, KMT2D, SETD1B, and ASH1L, are key mediators of both metabolic and epigenetic changes during cellular senescence. Mol Biol Cell 2022; 33:ar36. [PMID: 35196069 PMCID: PMC9282020 DOI: 10.1091/mbc.e20-08-0523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Cellular senescence is a terminal cell fate characterized by growth arrest and a metabolically active state characterized by high glycolytic activity. Human fibroblasts were placed in a unique metabolic state using a combination of methionine restriction (MetR) and rapamycin (Rapa). This combination induced a metabolic reprogramming that prevented the glycolytic shift associated with senescence. Surprisingly, cells treated in this manner did not undergo senescence but continued to divide at a slow rate even at high passage, in contrast with either Rapa treatment or MetR, both of which extended life span but eventually resulted in growth arrest. Transcriptome-wide analysis revealed a coordinated regulation of metabolic enzymes related to one-carbon metabolism including three methyltransferase enzymes (KMT2D, SETD1B, and ASH1L), key enzymes for both carnitine synthesis and histone modification. These enzymes appear to be involved in both the metabolic phenotype of senescent cells and the chromatin changes required for establishing the senescence arrest. Targeting one of these enzymes, ASH1L, produced both a glycolytic shift and senescence, providing proof of concept. These findings reveal a mechanistic link between a major metabolic hallmark of senescence and nuclear events required for senescence.
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Affiliation(s)
- Timothy Nacarelli
- Glaxosmithkline, Oncology Synthetic Lethal Research Unit, Collegeville PA
| | | | - Manali Potnis
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA
| | | | - Joshua Mell
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA
| | - F Brad Johnson
- Department of Pathology, University of Pennsylvania, Philadelphia, PA 19104
| | - Holly Brown-Borg
- Department of Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND
| | - Eishi Nogouchi
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA
| | - Christian Sell
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA
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14
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Nieto-Torres JL, Hansen M. Macroautophagy and aging: The impact of cellular recycling on health and longevity. Mol Aspects Med 2021; 82:101020. [PMID: 34507801 PMCID: PMC8671213 DOI: 10.1016/j.mam.2021.101020] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/11/2021] [Accepted: 08/31/2021] [Indexed: 02/08/2023]
Abstract
Aging is associated with many deleterious changes at the cellular level, including the accumulation of potentially toxic components that can have devastating effects on health. A key protective mechanism to this end is the cellular recycling process called autophagy. During autophagy, damaged or surplus cellular components are delivered to acidic vesicles called lysosomes, that secure degradation and recycling of the components. Numerous links between autophagy and aging exist. Autophagy declines with age, and increasing evidence suggests that this reduction plays important roles in both physiological aging and the development of age-associated disorders. Studies in pharmacologically and genetically manipulated model organisms indicate that defects in autophagy promote age-related diseases, and conversely, that enhancement of autophagy has beneficial effects on both healthspan and lifespan. Here, we review our current understanding of the role of autophagy in different physiological processes and their molecular links with aging and age-related diseases. We also highlight some recent advances in the field that could accelerate the development of autophagy-based therapeutic interventions.
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Affiliation(s)
- Jose L Nieto-Torres
- Sanford Burnham Prebys Medical Discovery Institute. Program of Development, Aging, and Regeneration, La Jolla, CA, USA
| | - Malene Hansen
- Sanford Burnham Prebys Medical Discovery Institute. Program of Development, Aging, and Regeneration, La Jolla, CA, USA.
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15
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Mosejová E, Bosnjakovic R, Kubala L, Vašíček O. Pseurotin D Induces Apoptosis through Targeting Redox Sensitive Pathways in Human Lymphoid Leukemia Cells. Antioxidants (Basel) 2021; 10:antiox10101576. [PMID: 34679711 PMCID: PMC8533295 DOI: 10.3390/antiox10101576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/23/2021] [Accepted: 10/01/2021] [Indexed: 01/23/2023] Open
Abstract
Chronic lymphocytic leukemia (CLL) is the most prevalent lymphoid malignancy in many geographical regions of the world. Pseurotin D, a secondary metabolite of fungi, represents a group of bioactive natural products with a newly ascribed range of interesting biological activities. The purpose of this study was to bring new insights into the mechanism behind the effects of pseurotin D on MEC-1 cells as a representative CLL cell line, with a particular focus on selected signaling pathways important in the proliferation of cells and targeting mitochondrial metabolism. Our results showed that pseurotin D was able to significantly inhibit the proliferation of MEC-1 cells and arrested them in the G2/M cell cycle phase. In addition, pseurotin D was able to induce apoptosis. We found that all of these effects were associated with a change in mitochondrial membrane potential and the production of mitochondrial reactive oxygen species (ROS). We showed for the first time that pseurotin D suppresses MEC-1 cell proliferation and induces apoptotic cell death via induction of the collapse of the mitochondria respiratory chain and the ROS-related caspase pathway. Our results show the pseurotins family as promising compounds which could serve as a basis for the development of new compounds in the treatment of lymphoma.
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Affiliation(s)
- Eva Mosejová
- Institute of Biophysics of the Czech Academy of Sciences, 612 65 Brno, Czech Republic; (E.M.); (R.B.); (L.K.)
| | - Rebeka Bosnjakovic
- Institute of Biophysics of the Czech Academy of Sciences, 612 65 Brno, Czech Republic; (E.M.); (R.B.); (L.K.)
| | - Lukáš Kubala
- Institute of Biophysics of the Czech Academy of Sciences, 612 65 Brno, Czech Republic; (E.M.); (R.B.); (L.K.)
- Institute of Experimental Biology, Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
- International Clinical Research Center, St. Anne’s University Hospital, 656 91 Brno, Czech Republic
| | - Ondřej Vašíček
- Institute of Biophysics of the Czech Academy of Sciences, 612 65 Brno, Czech Republic; (E.M.); (R.B.); (L.K.)
- Institute of Experimental Biology, Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
- Correspondence: ; Tel.: +420-541-517-207
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16
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Zhang Y, Zhang J, Wang S. The Role of Rapamycin in Healthspan Extension via the Delay of Organ Aging. Ageing Res Rev 2021; 70:101376. [PMID: 34089901 DOI: 10.1016/j.arr.2021.101376] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 05/07/2021] [Accepted: 05/30/2021] [Indexed: 12/17/2022]
Abstract
Aging can not only shorten a healthy lifespan, but can also lead to multi-organ dysfunction and failure. Anti-aging is a complex and worldwide conundrum for eliminating the various pathologies of senility. The past decade has seen great progress in the understanding of the aging-associated signaling pathways and their application for developing anti-aging approaches. Currently, some drugs can improve quality of life. The activation of mammalian target of rapamycin (mTOR) signaling is one of the core and detrimental mechanisms related to aging; rapamycin can reduce the rate of aging, improve age-related diseases by inhibiting the mTOR pathway, and prolong lifespan and healthspan effectively. However, the current evidence for rapamycin in lifespan extension and organ aging is fragmented and scattered. In this review, we summarize the efficacy and safety of rapamycin in prolonging a healthy lifespan by systematically alleviating aging in multiple organ systems, i.e., the nervous, urinary, digestive, circulatory, motor, respiratory, endocrine, reproductive, integumentary and immune systems, to provide a theoretical basis for the future clinical application of rapamycin in anti-aging.
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Affiliation(s)
- Yan Zhang
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China; National Clinical Research Center for Obstetrical and Gynecological Diseases, Huazhong University of Science and Technology, Wuhan, 430030, China; Key Laboratory of Cancer Invasion and Metastasis, Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Jinjin Zhang
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China; National Clinical Research Center for Obstetrical and Gynecological Diseases, Huazhong University of Science and Technology, Wuhan, 430030, China; Key Laboratory of Cancer Invasion and Metastasis, Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Shixuan Wang
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China; National Clinical Research Center for Obstetrical and Gynecological Diseases, Huazhong University of Science and Technology, Wuhan, 430030, China; Key Laboratory of Cancer Invasion and Metastasis, Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430030, China.
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17
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Cell-Free Culture Supernatant of Probiotic Lactobacillus fermentum Protects Against H 2O 2-Induced Premature Senescence by Suppressing ROS-Akt-mTOR Axis in Murine Preadipocytes. Probiotics Antimicrob Proteins 2021; 12:563-576. [PMID: 31332650 DOI: 10.1007/s12602-019-09576-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Information regarding cellular anti-senescence attributes of probiotic bacteria vis-à-vis modulation of senescence-associated secretory phenotype (SASP) and mTOR signaling is very limited. The present study assessed anti-senescence potential of secretory metabolites of probiotic Lactobacillus fermentum (Lact. fermentum) using H2O2-induced model of senescence in 3T3-L1 preadipocytes. Application of H2O2-induced cellular senescence characterized by increased cell size and SA-β-gal activity, activation of SASP and reactive oxygen species (ROS), DNA damage response and induction of cell cycle inhibitors (p53/p21WAF1/p16INK4a). Further, a robust stimulation of the PI3K/Akt/mTOR pathway and AMPK signaling was also observed in H2O2-treated cells. However, exposure of cells to cell-free supernatant of Lact. fermentum significantly attenuated phosphorylation of PI3K/Akt/mTOR pathway and alleviated senescence markers p53, p21WAF1, SA-β-gal, p38MAPK, iNOS, cox-2, ROS, NF-κB, and DNA damage response. These results provide evidence that secretory metabolites of Lact. fermentum can mitigate the development as well as severity of stress-induced senescence thereby indicating its utility for use as anti-aging or age-delaying agent.
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18
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Zia A, Pourbagher-Shahri AM, Farkhondeh T, Samarghandian S. Molecular and cellular pathways contributing to brain aging. BEHAVIORAL AND BRAIN FUNCTIONS : BBF 2021; 17:6. [PMID: 34118939 PMCID: PMC8199306 DOI: 10.1186/s12993-021-00179-9] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/27/2021] [Indexed: 12/12/2022]
Abstract
Aging is the leading risk factor for several age-associated diseases such as neurodegenerative diseases. Understanding the biology of aging mechanisms is essential to the pursuit of brain health. In this regard, brain aging is defined by a gradual decrease in neurophysiological functions, impaired adaptive neuroplasticity, dysregulation of neuronal Ca2+ homeostasis, neuroinflammation, and oxidatively modified molecules and organelles. Numerous pathways lead to brain aging, including increased oxidative stress, inflammation, disturbances in energy metabolism such as deregulated autophagy, mitochondrial dysfunction, and IGF-1, mTOR, ROS, AMPK, SIRTs, and p53 as central modulators of the metabolic control, connecting aging to the pathways, which lead to neurodegenerative disorders. Also, calorie restriction (CR), physical exercise, and mental activities can extend lifespan and increase nervous system resistance to age-associated neurodegenerative diseases. The neuroprotective effect of CR involves increased protection against ROS generation, maintenance of cellular Ca2+ homeostasis, and inhibition of apoptosis. The recent evidence about the modem molecular and cellular methods in neurobiology to brain aging is exhibiting a significant potential in brain cells for adaptation to aging and resistance to neurodegenerative disorders.
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Affiliation(s)
- Aliabbas Zia
- Department of Biochemistry, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Ali Mohammad Pourbagher-Shahri
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Birjand University of Medical Sciences (BUMS), 9717853577 Birjand, Iran
| | - Tahereh Farkhondeh
- Cardiovascular Diseases Research Center, Birjand University of Medical Sciences, Birjand, Iran
- Faculty of Pharmacy, Birjand University of Medical Sciences, Birjand, Iran
| | - Saeed Samarghandian
- Noncommunicable Diseases Research Center, Neyshabur University of Medical Sciences, Neyshabur, Iran
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19
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Xi Z, Xu C, Chen X, Wang B, Zhong Z, Sun Q, Sun Y, Bian L. Protocatechuic Acid Suppresses Microglia Activation and Facilitates M1 to M2 Phenotype Switching in Intracerebral Hemorrhage Mice. J Stroke Cerebrovasc Dis 2021; 30:105765. [PMID: 33813082 DOI: 10.1016/j.jstrokecerebrovasdis.2021.105765] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 03/12/2021] [Accepted: 03/14/2021] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVES Microglia activation, a key process in secondary injury following intracerebral hemorrhage (ICH), is divided to M1 and M2 phenotype. Protocatechuic acid (PCA) is a phenolic acid been proved neuroprotection in ICH without understanding of details. Thus, this study aimed to observe the influence of PCA on microglia activation and explore underlying mechanisms. MATERIALS AND METHODS To assess PCA affected microglia activation in vivo, an experimental ICH mice model was established and then treated with PCA intraperitoneal injection. Immunofluorescence staining was performed in brain slices at day 3 post ICH. BV2 cells were stimulated with hemin for activation, then M1 and M2 biomarkers were analyzed using Western Blot and qPCR. At last, we detected the expression of mTOR and its downstream molecules to discuss possible mechanisms. RESULTS At day 3 post ICH, less activated microglia gathering around hematoma after PCA treatment. Furtherly, in hemin treated BV2 cells, PCA downregulated M1 and promoted M2 biomarkers expression in both mRNA and protein level. PCA inhibited the phosphorylation of mTOR, S6K1 and 4E-BP1, while the inhibition was disappeared after supplemented with mTOR activator. CONCLUSIONS PCA impacted microglia activation by suppressing the mTOR signaling pathway, thereby improving M1/M2 switch and attenuated neuroinflammation.
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Affiliation(s)
- Zhiyu Xi
- Department of Neurosurgery, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230001, Anhui, China; Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Canxin Xu
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Xiao Chen
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Baofeng Wang
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Zhihong Zhong
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Qingfang Sun
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Yuhao Sun
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China
| | - Liuguan Bian
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, China.
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20
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Cao L, Lee SG, Park SH, Kim HR. Sargahydroquinoic acid (SHQA) suppresses cellular senescence through Akt/mTOR signaling pathway. Exp Gerontol 2021; 151:111406. [PMID: 34022274 DOI: 10.1016/j.exger.2021.111406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 05/13/2021] [Accepted: 05/17/2021] [Indexed: 01/10/2023]
Abstract
AIM The effects of sargahydroquinoic acid (SHQA) on cellular senescence and the underlying mechanisms were investigated using human umbilical vascular endothelial cells (HUVECs). METHODS SHQA or DMSO was supplemented into the medium. Low dose of H2O2 was used to induce premature senescence. Replicative senescence was achieved by continuously culturing cells until they reached a plateau phase. Senescence biomarkers, including p53, p21, and p16 proteins, and SA-β-Gal activity were measured. RESULTS Pretreatment of SHQA significantly suppressed the oxidative stress-induced protein expression of p53, p21, and p16, as well as the activity of SA-β-Gal. Additionally, SHQA also delayed the replicative senescence as indicated by an increased population doubling number, reduced protein expression of p53, p21, and p16, as well as a decreased SA-β-Gal activity. SHQA inhibited the phosphorylation of Akt, mTOR, and downstream targets of mTOR, such as p-S6K, which was elevated by premature senescence and replicative senescence. In the absence of senescence stimuli, SHQA also inhibited the Akt/mTOR signaling pathway and promoted autophagy. CONCLUSIONS SHQA suppressed senescence induced by oxidative stress and replication through inhibiting the Akt/mTOR pathway. With the potential of acting as an Akt/mTOR inhibitor, SHQA might be useful for developing anti-ageing therapy.
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Affiliation(s)
- Lei Cao
- Institute of Marine Life Science, Pukyong National University, Daeyeon 3-dong, Nam-gu, Busan 608-737, South Korea.
| | - Sang Gil Lee
- Department of Food Science and Nutrition, Pukyong National University, Daeyeon 3-dong, Nam-gu, Busan 608-737, South Korea.
| | - Sang-Hyug Park
- Department of Biomedical Engineering, Pukyong National University, Daeyeon 3-dong, Nam-gu, Busan 608-737, South Korea.
| | - Hyeung-Rak Kim
- Department of Food Science and Nutrition, Pukyong National University, Daeyeon 3-dong, Nam-gu, Busan 608-737, South Korea.
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21
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Packer M. Longevity genes, cardiac ageing, and the pathogenesis of cardiomyopathy: implications for understanding the effects of current and future treatments for heart failure. Eur Heart J 2021; 41:3856-3861. [PMID: 32460327 PMCID: PMC7599035 DOI: 10.1093/eurheartj/ehaa360] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 03/26/2020] [Accepted: 04/17/2020] [Indexed: 12/11/2022] Open
Abstract
The two primary molecular regulators of lifespan are sirtuin-1 (SIRT1) and mammalian target of rapamycin complex 1 (mTORC1). Each plays a central role in two highly interconnected pathways that modulate the balance between cellular growth and survival. The activation of SIRT1 [along with peroxisome proliferator-activated receptor-gamma coactivator (PGC-1α) and adenosine monophosphate-activated protein kinase (AMPK)] and the suppression of mTORC1 (along with its upstream regulator, Akt) act to prolong organismal longevity and retard cardiac ageing. Both activation of SIRT1/PGC-1α and inhibition of mTORC1 shifts the balance of cellular priorities so as to promote cardiomyocyte survival over growth, leading to cardioprotective effects in experimental models. These benefits may be related to direct actions to modulate oxidative stress, organellar function, proinflammatory pathways, and maladaptive hypertrophy. In addition, a primary shared benefit of both SIRT1/PGC-1α/AMPK activation and Akt/mTORC1 inhibition is the enhancement of autophagy, a lysosome-dependent degradative pathway, which clears the cytosol of dysfunctional organelles and misfolded proteins that drive the ageing process by increasing oxidative and endoplasmic reticulum stress. Autophagy underlies the ability of SIRT1/PGC-1α/AMPK activation and Akt/mTORC1 suppression to extend lifespan, mitigate cardiac ageing, alleviate cellular stress, and ameliorate the development and progression of cardiomyopathy; silencing of autophagy genes abolishes these benefits. Loss of SIRT1/PGC-1α/AMPK function or hyperactivation of Akt/mTORC1 is a consistent feature of experimental cardiomyopathy, and reversal of these abnormalities mitigates the development of heart failure. Interestingly, most treatments that have been shown to be clinically effective in the treatment of chronic heart failure with a reduced ejection fraction have been reported experimentally to exert favourable effects to activate SIRT1/PGC-1α/AMPK and/or suppress Akt/mTORC1, and thereby, to promote autophagic flux. Therefore, the impairment of autophagy resulting from derangements in longevity gene signalling is likely to represent a seminal event in the evolution and progression of cardiomyopathy. ![]()
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Affiliation(s)
- Milton Packer
- Baylor Heart and Vascular Institute, Baylor University Medical Center, 621 N. Hall Street, Dallas, TX 75226, USA.,Imperial College, London, UK
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22
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Rackova L, Mach M, Brnoliakova Z. An update in toxicology of ageing. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 84:103611. [PMID: 33581363 DOI: 10.1016/j.etap.2021.103611] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/17/2021] [Accepted: 02/03/2021] [Indexed: 06/12/2023]
Abstract
The field of ageing research has been rapidly advancing in recent decades and it had provided insight into the complexity of ageing phenomenon. However, as the organism-environment interaction appears to significantly affect the organismal pace of ageing, the systematic approach for gerontogenic risk assessment of environmental factors has yet to be established. This puts demand on development of effective biomarker of ageing, as a relevant tool to quantify effects of gerontogenic exposures, contingent on multidisciplinary research approach. Here we review the current knowledge regarding the main endogenous gerontogenic pathways involved in acceleration of ageing through environmental exposures. These include inflammatory and oxidative stress-triggered processes, dysregulation of maintenance of cellular anabolism and catabolism and loss of protein homeostasis. The most effective biomarkers showing specificity and relevancy to ageing phenotypes are summarized, as well. The crucial part of this review was dedicated to the comprehensive overview of environmental gerontogens including various types of radiation, certain types of pesticides, heavy metals, drugs and addictive substances, unhealthy dietary patterns, and sedentary life as well as psychosocial stress. The reported effects in vitro and in vivo of both recognized and potential gerontogens are described with respect to the up-to-date knowledge in geroscience. Finally, hormetic and ageing decelerating effects of environmental factors are briefly discussed, as well.
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Affiliation(s)
- Lucia Rackova
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine, Slovak Academy of Sciences, Dubravska cesta 9, 841 04 Bratislava, Slovakia.
| | - Mojmir Mach
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine, Slovak Academy of Sciences, Dubravska cesta 9, 841 04 Bratislava, Slovakia
| | - Zuzana Brnoliakova
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine, Slovak Academy of Sciences, Dubravska cesta 9, 841 04 Bratislava, Slovakia
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23
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Abstract
Significance: Cell senescence was originally defined by an acute loss of replicative capacity and thus believed to be restricted to proliferation-competent cells. More recently, senescence has been recognized as a cellular stress and damage response encompassing multiple pathways or senescence domains, namely DNA damage response, cell cycle arrest, senescence-associated secretory phenotype, senescence-associated mitochondrial dysfunction, autophagy/mitophagy dysfunction, nutrient and stress signaling, and epigenetic reprogramming. Each of these domains is activated during senescence, and all appear to interact with each other. Cell senescence has been identified as an important driver of mammalian aging. Recent Advances: Activation of all these senescence domains has now also been observed in a wide range of post-mitotic cells, suggesting that senescence as a stress response can occur in nondividing cells temporally uncoupled from cell cycle arrest. Here, we review recent evidence for post-mitotic cell senescence and speculate about its possible relevance for mammalian aging. Critical Issues: Although a majority of senescence domains has been found to be activated in a range of post-mitotic cells during aging, independent confirmation of these results is still lacking for most of them. Future Directions: To define whether post-mitotic senescence plays a significant role as a driver of aging phenotypes in tissues such as brain, muscle, heart, and others. Antioxid. Redox Signal. 34, 308-323.
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Affiliation(s)
- Thomas von Zglinicki
- Ageing Research Laboratories, Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom.,Molecular Biology and Genetics, Arts and Sciences Faculty, Near East University, Nicosia, Turkey
| | - Tengfei Wan
- Ageing Research Laboratories, Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Satomi Miwa
- Ageing Research Laboratories, Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
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24
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Rackow AR, Nagel DJ, McCarthy C, Judge J, Lacy S, Freeberg MAT, Thatcher TH, Kottmann RM, Sime PJ. The self-fulfilling prophecy of pulmonary fibrosis: a selective inspection of pathological signalling loops. Eur Respir J 2020; 56:13993003.00075-2020. [PMID: 32943406 PMCID: PMC7931159 DOI: 10.1183/13993003.00075-2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 07/01/2020] [Indexed: 12/28/2022]
Abstract
Pulmonary fibrosis is a devastating, progressive disease and carries a prognosis worse than most cancers. Despite ongoing research, the mechanisms that underlie disease pathogenesis remain only partially understood. However, the self-perpetuating nature of pulmonary fibrosis has led several researchers to propose the existence of pathological signalling loops. According to this hypothesis, the normal wound-healing process becomes corrupted and results in the progressive accumulation of scar tissue in the lung. In addition, several negative regulators of pulmonary fibrosis are downregulated and, therefore, are no longer capable of inhibiting these feed-forward loops. The combination of pathological signalling loops and loss of a checks and balances system ultimately culminates in a process of unregulated scar formation. This review details specific signalling pathways demonstrated to play a role in the pathogenesis of pulmonary fibrosis. The evidence of detrimental signalling loops is elucidated with regard to epithelial cell injury, cellular senescence and the activation of developmental and ageing pathways. We demonstrate where these loops intersect each other, as well as common mediators that may drive these responses and how the loss of pro-resolving mediators may contribute to the propagation of disease. By focusing on the overlapping signalling mediators among the many pro-fibrotic pathways, it is our hope that the pulmonary fibrosis community will be better equipped to design future trials that incorporate the redundant nature of these pathways as we move towards finding a cure for this unrelenting disease.
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Affiliation(s)
- Ashley R Rackow
- Dept of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, USA.,Authors contributed equally to this work
| | - David J Nagel
- Division of Pulmonary Diseases and Critical Care, University of Rochester Medical Center, Rochester, NY, USA.,Authors contributed equally to this work
| | | | | | - Shannon Lacy
- US Army of Veterinary Corps, Fort Campbell, KY, USA
| | | | - Thomas H Thatcher
- Department of Medicine, Virginia Commonwealth University, Richmond, VA, USA
| | - R Matthew Kottmann
- Division of Pulmonary Diseases and Critical Care, University of Rochester Medical Center, Rochester, NY, USA
| | - Patricia J Sime
- Division of Pulmonary Diseases and Critical Care, University of Rochester Medical Center, Rochester, NY, USA.,Department of Medicine, Virginia Commonwealth University, Richmond, VA, USA
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25
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Yin Z, Park R, Choi BM. Isoparvifuran isolated from Dalbergia odorifera attenuates H 2O 2-induced senescence of BJ cells through SIRT1 activation and AKT/mTOR pathway inhibition. Biochem Biophys Res Commun 2020; 533:925-931. [PMID: 33010892 DOI: 10.1016/j.bbrc.2020.09.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 09/22/2020] [Indexed: 01/08/2023]
Abstract
Isoparvifuran is a benzofuran compound isolated from the heartwood of Dalbergia odorifera. Related research reported that isoparvifuran has antioxidant property. However, it is unclear whether isoparvifuran has anti-aging effects. In this research, we established an aging model, hydrogen peroxide (H2O2)-induced BJ cell senescence, to explore the protective effect of isoparvifuran on cell senescence and its related mechanisms. Our results revealed that isoparvifuran obviously attenuated H2O2-induced cell senescence, increased the cell proliferation rate,and reversed senescence-associated molecular markers expression such as cyclin D1, pRb, caveolin-1, ace-p53, p21 and p16. Moreover, isoparvifuran dose and time dependently increased the expression level of Sirtuin 1 (SIRT1) in BJ cells. The inhibition of SIRT1 obviously reversed the reduction of SA-β-gal activity and the alteration of senescence-associated molecular markers induced by isoparvifuran. Additionally, isoparvifuran also inhibited H2O2-induced AKT and S6 phosphorylation and increase of SA-β-gal activity. In summary, isoparvifuran protects BJ cells from H2O2-induced premature senescence, the anti-senescence effect of isoparvifuran is associated with the activation of SIRT1 and the suppression of AKT/mTOR signaling pathway.
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Affiliation(s)
- Zengsheng Yin
- Department of Anesthesiology, Affiliated Hospital of Jiujiang University, Jiujiang, 332000, China; Department of Biochemistry, School of Medicine, Wonkwang University, Iksan, 54538, Republic of Korea
| | - Raekil Park
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Byung-Min Choi
- Department of Biochemistry, School of Medicine, Wonkwang University, Iksan, 54538, Republic of Korea.
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26
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Chaput C, Sirard MA. Embryonic response to high beta-hydroxybutyrate (BHB) levels in postpartum dairy cows. Domest Anim Endocrinol 2020; 72:106431. [PMID: 32325411 DOI: 10.1016/j.domaniend.2019.106431] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 10/21/2019] [Accepted: 12/27/2019] [Indexed: 12/11/2022]
Abstract
Cows at the beginning of lactation often do not meet their energy needs by feeding and therefore mobilize body fat, which produces ketone bodies, including β-hydroxybutyrate (BHB). They are nevertheless usually inseminated around 60 d postpartum, when they are still in this characteristic period of energy deficit. The aim of this study was to observe the effects of negative energy balance on embryo quality and to identify ways to improve the fertility of dairy cows. Holstein cows (n = 18) grouped as high or low BHB based on blood measurement at day 45 postpartum were estrus-synchronized and treated with follicle-stimulating hormone to obtain multiple follicle development, induced to ovulate and inseminated with sexed semen around day 60 postpartum. Of the 290 embryos collected over 16 mo, 159 were of quality I to IV. Based on microarray analysis of gene expression, exposure to an energy deficit metabolic environment (high BHB) during early development appeared to modify signaling by the mTOR and sirtuins pathways in the embryo, implying mitochondrial dysfunction and inhibition of transcription, leading to slower cell division, thus programming the embryo to be more energy efficient. Altered methylation markers suggested that such coping mechanisms might persist into adulthood.
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Affiliation(s)
- C Chaput
- Centre de recherche en reproduction, développement et santé intergénérationnelle, Faculté des sciences de l'Agriculture et de l'Alimentation, Département des Sciences Animales, Pavillon INAF, Université Laval, Québec, Québec, Canada
| | - M A Sirard
- Centre de recherche en reproduction, développement et santé intergénérationnelle, Faculté des sciences de l'Agriculture et de l'Alimentation, Département des Sciences Animales, Pavillon INAF, Université Laval, Québec, Québec, Canada.
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27
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Shao Z, Koh W, Ni Y, Li W, Agatisa-Boyle B, Merkurjev D, Tang WHW. RNA Sequence Analyses throughout the Course of Mouse Cardiac Laminopathy Identify Differentially Expressed Genes for Cell Cycle Control and Mitochondrial Function. Sci Rep 2020; 10:6632. [PMID: 32313136 PMCID: PMC7170950 DOI: 10.1038/s41598-020-63563-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Accepted: 03/30/2020] [Indexed: 12/03/2022] Open
Abstract
Lamin A/C (LMNA) gene mutations are a known cause of familial dilated cardiomyopathy, but the precise mechanisms triggering disease progression remain unknown. We hypothesize that analysis of differentially expressed genes (DEGs) throughout the course of Lmna knockout (Lmna-/-)-induced cardiomyopathy may reveal novel Lmna-mediated alterations of signaling pathways leading to dilated cardiomyopathy. Although Lmna was the only DEG down-regulated at 1 week of age, we identified 730 and 1004 DEGs in Lmna-/- mice at 2 weeks and 1 month of age, respectively. At 2 weeks, Lmna-/- mice demonstrated both down- and up-regulation of the key genes involving cell cycle control, mitochondrial dysfunction, and oxidative phosphorylation, as well as down-regulated genes governing DNA damage repair and up-regulated genes involved in oxidative stress response, cell survival, and cardiac hypertrophy. At 1 month, the down-regulated genes included those involved in oxidative phosphorylation, mitochondrial dysfunction, nutrient metabolism, cardiac β-adrenergic signaling, action potential generation, and cell survival. We also found 96 overlapping DEGs at both ages involved in oxidative phosphorylation, mitochondrial function, and calcium signaling. Impaired oxidative phosphorylation was observed at early disease stage, even before the appearance of disease phenotypes, and worsened with disease progression, suggesting its importance in the pathogenesis and progression of LMNA cardiomyopathy. Reduction of oxidative stress might therefore prevent or delay the development from Lmna mutation to LMNA cardiomyopathy.
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Affiliation(s)
- Zhili Shao
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Wonshill Koh
- Department of Cardiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Ying Ni
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Wei Li
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | - Brendan Agatisa-Boyle
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Daria Merkurjev
- Division of Cardiology, Department of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
| | - Wai Hong Wilson Tang
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA.
- Kaufman Center for Heart Failure Treatment and Recovery, Department of Cardiovascular Medicine, Heart, Vascular & Thoracic Institute, Cleveland Clinic, Cleveland, OH, USA.
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28
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Systems Biology Analysis of the Antagonizing Effects of HIV-1 Tat Expression in the Brain over Transcriptional Changes Caused by Methamphetamine Sensitization. Viruses 2020; 12:v12040426. [PMID: 32283831 PMCID: PMC7232389 DOI: 10.3390/v12040426] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 03/27/2020] [Accepted: 04/01/2020] [Indexed: 01/06/2023] Open
Abstract
Methamphetamine (Meth) abuse is common among humans with immunodeficiency virus (HIV). The HIV-1 regulatory protein, trans-activator of transcription (Tat), has been described to induce changes in brain gene transcription that can result in impaired reward circuitry, as well as in inflammatory processes. In transgenic mice with doxycycline-induced Tat protein expression in the brain, i.e., a mouse model of neuroHIV, we tested global gene expression patterns induced by Meth sensitization. Meth-induced locomotor sensitization included repeated daily Meth or saline injections for seven days and Meth challenge after a seven-day abstinence period. Brain samples were collected 30 min after the Meth challenge. We investigated global gene expression changes in the caudate putamen, an area with relevance in behavior and HIV pathogenesis, and performed pathway and transcriptional factor usage predictions using systems biology strategies. We found that Tat expression alone had a very limited impact in gene transcription after the Meth challenge. In contrast, Meth-induced sensitization in the absence of Tat induced a global suppression of gene transcription. Interestingly, the interaction between Tat and Meth broadly prevented the Meth-induced global transcriptional suppression, by maintaining regulation pathways, and resulting in gene expression profiles that were more similar to the controls. Pathways associated with mitochondrial health, initiation of transcription and translation, as well as with epigenetic control, were heavily affected by Meth, and by its interaction with Tat in anti-directional ways. A series of systems strategies have predicted several components impacted by these interactions, including mitochondrial pathways, mTOR/RICTOR, AP-1 transcription factor, and eukaryotic initiation factors involved in transcription and translation. In spite of the antagonizing effects of Tat, a few genes identified in relevant gene networks remained downregulated, such as sirtuin 1, and the amyloid precursor protein (APP). In conclusion, Tat expression in the brain had a low acute transcriptional impact but strongly interacted with Meth sensitization, to modify effects in the global transcriptome.
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29
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Al-Azab M, Wang B, Elkhider A, Walana W, Li W, Yuan B, Ye Y, Tang Y, Almoiliqy M, Adlat S, Wei J, Zhang Y, Li X. Indian Hedgehog regulates senescence in bone marrow-derived mesenchymal stem cell through modulation of ROS/mTOR/4EBP1, p70S6K1/2 pathway. Aging (Albany NY) 2020; 12:5693-5715. [PMID: 32235006 PMCID: PMC7185126 DOI: 10.18632/aging.102958] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 02/19/2020] [Indexed: 12/12/2022]
Abstract
Premature senescence of bone marrow-derived mesenchymal stem cells (BMSC) remains a major concern for their application clinically. Hedgehog signaling has been reported to regulate aging-associated markers and MSC skewed differentiation. Indian Hedgehog (IHH) is a ligand of Hedgehog intracellular pathway considered as an inducer in chondrogenesis of human BMSC. However, the role of IHH in the aging of BMSC is still unclear. This study explored the role IHH in the senescence of BMSC obtained from human samples and senescent mice. Isolated BMSC were transfected with IHH siRNA or incubated with exogenous IHH protein and the mechanisms of aging and differentiation investigated. Moreover, the interactions between IHH, and mammalian target of rapamycin (mTOR) and reactive oxygen species (ROS) were evaluated using the corresponding inhibitors and antioxidants. BMSC transfected with IHH siRNA showed characteristics of senescence-associated features including increased senescence-associated β-galactosidase activity (SA-β-gal), induction of cell cycle inhibitors (p53/p16), development of senescence-associated secretory phenotype (SASP), activation of ROS and mTOR pathways as well as the promotion of skewed differentiation. Interestingly, BMSC treatment with IHH protein reversed the senescence markers and corrected biased differentiation. Moreover, IHH shortage-induced senescence signs were compromised after mTOR and ROS inhibition. Our findings presented anti-aging activity for IHH in BMSC through down-regulation of ROS/mTOR pathways. This discovery might contribute to increasing the therapeutic, immunomodulatory and regenerative potency of BMSC and introduce a novel remedy in the management of aging-related diseases.
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Affiliation(s)
- Mahmoud Al-Azab
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China.,Department of Immunology, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Bing Wang
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Abdalkhalig Elkhider
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Williams Walana
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China.,Department of Clinical Microbiology, University for Development Studies, Tamale, Ghana
| | - Weiping Li
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Bo Yuan
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Yunshan Ye
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Yawei Tang
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Marwan Almoiliqy
- Department of Pharmacology, College of Pharmacy, Dalian Medical University, Liaoning, China
| | - Salah Adlat
- Key Laboratory of Molecular Epigenetics of MOE, School of Life Science, Northeast Normal University, Changchun, Jilin Province, China
| | - Jing Wei
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
| | - Yan Zhang
- Department of Rheumatology and Immunology, The Second Affiliated Hospital of Dalian Medical University, Liaoning, China
| | - Xia Li
- Department of Immunology, College of Basic Medical Science, Dalian Medical University, Liaoning, China
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30
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Sharma R, Padwad Y. Perspectives of the potential implications of polyphenols in influencing the interrelationship between oxi-inflammatory stress, cellular senescence and immunosenescence during aging. Trends Food Sci Technol 2020. [DOI: 10.1016/j.tifs.2020.02.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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31
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Zhang F, Peng W, Zhang J, Dong W, Wu J, Wang T, Xie Z. P53 and Parkin co-regulate mitophagy in bone marrow mesenchymal stem cells to promote the repair of early steroid-induced osteonecrosis of the femoral head. Cell Death Dis 2020; 11:42. [PMID: 31959744 PMCID: PMC6971291 DOI: 10.1038/s41419-020-2238-1] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 12/20/2019] [Accepted: 12/20/2019] [Indexed: 12/26/2022]
Abstract
Survival and stemness of bone marrow mesenchymal stem cells (BMSCs) in osteonecrotic areas are especially important in the treatment of early steroid-induced osteonecrosis of the femoral head (ONFH). We had previously used BMSCs to repair early steroid-induced ONFH, but the transplanted BMSCs underwent a great deal of stress-induced apoptosis and aging in the oxidative-stress (OS) microenvironment of the femoral-head necrotic area, which limited their efficacy. Our subsequent studies have shown that under OS, massive accumulation of damaged mitochondria in cells is an important factor leading to stress-induced apoptosis and senescence of BMSCs. The main reason for this accumulation is that OS leads to upregulation of protein 53 (P53), which inhibits mitochondrial translocation of Parkin and activation of Parkin’s E3 ubiquitin ligase, which decreases the level of mitophagy and leads to failure of cells to effectively remove damaged mitochondria. However, P53 downregulation can effectively reverse this process. Therefore, we upregulated Parkin and downregulated P53 in BMSCs. We found that this significantly enhanced mitophagy in BMSCs, decreased the accumulation of damaged mitochondria in cells, effectively resisted stress-induced BMSCs apoptosis and senescence, and improved the effect of BMSCs transplantation on early steroid-induced ONFH.
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Affiliation(s)
- Fei Zhang
- Department of Orthopedics, The Affliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550004, China.,Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Wuxun Peng
- Department of Orthopedics, The Affliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550004, China. .,Guizhou Medical University, Guiyang, Guizhou, 550004, China.
| | - Jian Zhang
- Department of Orthopedics, The Affliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550004, China.,Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Wentao Dong
- Department of Orthopedics, The Affliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550004, China.,Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Jianhua Wu
- Department of Orthopedics, The Affliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550004, China.,Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Tao Wang
- Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Zhihong Xie
- Guizhou Medical University, Guiyang, Guizhou, 550004, China
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32
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Guo D, Shen Y, Li W, Li Q, Miao Y, Zhong Y. Upregulation of flavin-containing monooxygenase 3 mimics calorie restriction to retard liver aging by inducing autophagy. Aging (Albany NY) 2020; 12:931-944. [PMID: 31927537 PMCID: PMC6977670 DOI: 10.18632/aging.102666] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 12/24/2019] [Indexed: 02/06/2023]
Abstract
Flavin-containing monooxygenase 3 (FMO3) gene expression is often upregulated in long-lived murine models. However, the specific relationship between FMO3 and aging remains unknown. Here, we show that 40% calorie restriction (CR), which is considered to be one of the most robust interventions to delay aging progression, markedly upregulates FMO3. Most importantly, upregulation of hepatocyte FMO3 in murine models prevented or reversed hepatic aging. Accordingly, the upregulation of FMO3 mimicked the effects of CR: reduced serum levels of pro-inflammatory cytokine interleukin-6 and fasting insulin; relief of oxidative stress, with lower hepatic malondialdehyde levels and higher superoxide dismutase activity; reduced serum and hepatic levels of total cholesterol and triglyceride, as well as reduced lipid deposition in the liver; and diminished levels of aging-related markers β-gal and p16. There were also synergistic effects between FMO3 upregulation and CR. Inhibition of autophagy blocked the anti-aging effects of upregulation of hepatocyte FMO3, including reversing the amelioration of the serum and hepatic parameters related to inflammation, oxidative stress, lipid metabolism, liver function, and hepatocyte senescence. Our results suggest that the upregulation of FMO3 mimics CR to prevent or reverse hepatic aging by promoting autophagy.
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Affiliation(s)
- Donghao Guo
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong
| | - Yun Shen
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Wei Li
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Qinjie Li
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Ya Miao
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Yuan Zhong
- Department of Geriatrics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
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33
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Chung CL, Lawrence I, Hoffman M, Elgindi D, Nadhan K, Potnis M, Jin A, Sershon C, Binnebose R, Lorenzini A, Sell C. Topical rapamycin reduces markers of senescence and aging in human skin: an exploratory, prospective, randomized trial. GeroScience 2019; 41:861-869. [PMID: 31761958 PMCID: PMC6925069 DOI: 10.1007/s11357-019-00113-y] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 10/09/2019] [Indexed: 01/07/2023] Open
Abstract
Aging is a major risk factor for the majority of human diseases, and the development of interventions to reduce the intrinsic rate of aging is expected to reduce the risk for age-related diseases including cardiovascular disease, cancer, and dementia. In the skin, aging manifests itself in photodamage and dermal atrophy, with underlying tissue reduction and impaired barrier function. To determine whether rapamycin, an FDA-approved drug targeting the mechanistic target of rapamycin (mTOR) complex, can reduce senescence and markers of aging in human skin, an exploratory, placebo-controlled, interventional trial was conducted in a clinical dermatology setting. Participants were greater than 40 years of age with evidence of age-related photoaging and dermal volume loss and no major morbidities. Thirty-six participants were enrolled in the study, and nineteen discontinued or were lost to follow-up. A significant (P = 0.008) reduction in p16INK4A protein levels and an increase in collagen VII protein levels (P = 0.0077) were observed among participants at the end of the study. Clinical improvement in skin appearance was noted in multiple participants, and immunohistochemical analysis revealed improvement in histological appearance of skin tissue. Topical rapamycin reduced the expression of the p16INK4A protein consistent with a reduction in cellular senescence. This change was accompanied by relative improvement in clinical appearance of the skin and histological markers of aging and by an increase in collagen VII, which is critical to the integrity of the basement membrane. These results indicate that rapamycin treatment is a potential anti-aging therapy with efficacy in humans.Trial registration ClinicalTrials.gov Identifier: NCT03103893.
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Affiliation(s)
- Christina Lee Chung
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Ibiyonu Lawrence
- Department of Medicine, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Melissa Hoffman
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Dareen Elgindi
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Kumar Nadhan
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Manali Potnis
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, 245 N 15th Street, Philadelphia, PA, 19102, USA
| | - Annie Jin
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Catlin Sershon
- Department of Dermatology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Rhonda Binnebose
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, 245 N 15th Street, Philadelphia, PA, 19102, USA
| | - Antonello Lorenzini
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Christian Sell
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, 245 N 15th Street, Philadelphia, PA, 19102, USA. .,Department of Biochemistry, Drexel University College of Medicine, Philadelphia, PA, USA.
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34
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Sharma R, Padwad Y. In search of nutritional anti-aging targets: TOR inhibitors, SASP modulators, and BCL-2 family suppressors. Nutrition 2019; 65:33-38. [DOI: 10.1016/j.nut.2019.01.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 12/26/2018] [Accepted: 01/25/2019] [Indexed: 02/07/2023]
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35
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Li JQ, Duan DD, Zhang JQ, Zhou YZ, Qin XM, Du GH, Gao L. Bioinformatic prediction of critical genes and pathways involved in longevity in Drosophila melanogaster. Mol Genet Genomics 2019; 294:1463-1475. [PMID: 31327054 DOI: 10.1007/s00438-019-01589-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 06/21/2019] [Indexed: 01/08/2023]
Abstract
The pursuit of longevity has been the goal of humanity since ancient times. Genetic alterations have been demonstrated to affect lifespan. As increasing numbers of pro-longevity genes and anti-longevity genes have been discovered in Drosophila, screening for functionally important genes among the large number of genes has become difficult. The aim of the present study was to explore critical genes and pathways affecting longevity in Drosophila melanogaster. In this study, 168 genes associated with longevity in D. melanogaster were collected from the Human Ageing Genomic Resources (HAGR) database. Network clustering analysis, network topological analysis, and pathway analysis were integrated to identify key genes and pathways. Quantitative real-time PCR (qRT-PCR) was applied to verify the expression of genes in representative pathways and of predicted genes derived from the gene-gene sub-network. Our results revealed that six key pathways might be associated with longevity, including the longevity-regulating pathway, the peroxisome pathway, the mTOR-signalling pathway, the FOXO-signalling pathway, the AGE-RAGE-signalling pathway in diabetic complications, and the TGF-beta-signalling pathway. Moreover, the results revealed that six key genes in representative pathways, including Cat, Ry, S6k, Sod, Tor, and Tsc1, and the predicted genes Jra, Kay, and Rheb exhibited significant expression changes in ageing D. melanogaster strain w1118 compared to young ones. Overall, our results revealed that six pathways and six key genes might play pivotal roles in regulating longevity, and three interacting genes might be implicated in longevity. The results will not only provide new insight into the mechanisms of longevity, but also provide novel ideas for network-based approaches for longevity-related research.
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Affiliation(s)
- Jia-Qi Li
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China.,College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, People's Republic of China
| | - Dan-Dan Duan
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China.,College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, People's Republic of China
| | - Jian-Qin Zhang
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China
| | - Yu-Zhi Zhou
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China
| | - Xue-Mei Qin
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China
| | - Guan-Hua Du
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China. .,Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Xian Nong Tan Street, Beijing, 100050, People's Republic of China.
| | - Li Gao
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, No. 92 Wu Cheng Road, Taiyuan, 030006, People's Republic of China.
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Fu C, Cao Y, Li B, Xu R, Sun Y, Yao Y. Bradykinin protects cardiac c-kit positive cells from high-glucose-induced senescence through B2 receptor signaling pathway. J Cell Biochem 2019; 120:17731-17743. [PMID: 31119778 DOI: 10.1002/jcb.29039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 05/01/2019] [Accepted: 05/03/2019] [Indexed: 12/12/2022]
Abstract
Cardiac c-kit positive cells are cardiac-derived cells that exist within the heart and have a great many protective effects. The senescence of cardiac c-kit positive cells probably leads to cell dysfunction. Bradykinin plays a key role in cell protection. However, whether bradykinin prevents cardiac c-kit positive cells from high-glucose-induced senescence is unknown. Here, we found that glucose treatment causes the premature senescence of cardiac c-kit positive cells. Bradykinin B2 receptor (B2R) expression was declined by glucose-induced senescence. Bradykinin treatment inhibited senescence and reduced intracellular oxygen radicals according to senescence-associated β-galactosidase staining and 2',7'-dichlorodihydrofluorescein diacetate staining. Moreover, the mitochondrial membrane potential was damaged, as measured by JC-1 staining. The mitochondrial membrane potential was preserved under bradykinin treatment. The concentration of superoxide was decreased, and the concentration of intracellular adenosine triphosphate was increased after bradykinin treatment. Western blot showed that bradykinin leads to AKT and mammalian target of rapamycin (mTOR) phosphorylation and decreased levels of P53 and P16 when compared with glucose treatment alone. Antagonists of B2R, phosphoinositide 3-kinase (PI3K), mTOR, and B2R small interfering RNA prevented the protective effect of bradykinin. P53 antagonist also inhibited the glucose-induced senescence of cardiac c-kit positive cells. In conclusion, bradykinin prevents the glucose-induced premature senescence of cardiac c-kit positive cells through the B2R/PI3K/AKT/mTOR/P53 signal pathways.
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Affiliation(s)
- Cong Fu
- Department of Cardiology, Yi Ji Shan hospital affiliated to Wan Nan Medical College, Wuhu, AnHui, China.,Department of Cardiology, Zhong Da hospital affiliated to Southeast University, Nanjing, JiangSu, China.,Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wann Nan Medical College, Wuhu, AnHui, China
| | - Yuhan Cao
- Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wann Nan Medical College, Wuhu, AnHui, China.,Department of Nephrology, Yi Ji Shan Hospital affiliated to Wan Nan Medical College, Wuhu, Anhui, China
| | - Bing Li
- Department of Cardiology, Zhong Da hospital affiliated to Southeast University, Nanjing, JiangSu, China
| | - Rongfeng Xu
- Department of Cardiology, Zhong Da hospital affiliated to Southeast University, Nanjing, JiangSu, China
| | - Yuning Sun
- Department of Cardiology, Zhong Da hospital affiliated to Southeast University, Nanjing, JiangSu, China
| | - Yuyu Yao
- Department of Cardiology, Zhong Da hospital affiliated to Southeast University, Nanjing, JiangSu, China
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Abstract
Organismal aging is accompanied by a host of progressive metabolic alterations and an accumulation of senescent cells, along with functional decline and the appearance of multiple diseases. This implies that the metabolic features of cell senescence may contribute to the organism’s metabolic changes and be closely linked to age-associated diseases, especially metabolic syndromes. However, there is no clear understanding of senescent metabolic characteristics. Here, we review key metabolic features and regulators of cellular senescence, focusing on mitochondrial dysfunction and anabolic deregulation, and their link to other senescence phenotypes and aging. We further discuss the mechanistic involvement of the metabolic regulators mTOR, AMPK, and GSK3, proposing them as key metabolic switches for modulating senescence.
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Affiliation(s)
- So Mee Kwon
- Departments of Biochemistry, Ajou University School of Medicine, Suwon 16499, Korea
| | - Sun Mi Hong
- Departments of Biochemistry and Biomedical Sciences (BK21 Plus), Ajou University School of Medicine, Suwon 16499, Korea
| | - Young-Kyoung Lee
- Departments of Biochemistry, Ajou University School of Medicine, Suwon 16499, Korea
| | - Seongki Min
- Departments of Biochemistry and Biomedical Sciences (BK21 Plus), Ajou University School of Medicine, Suwon 16499, Korea
| | - Gyesoon Yoon
- Departments of Biochemistry and Biomedical Sciences (BK21 Plus), Ajou University School of Medicine, Suwon 16499, Korea
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38
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Metformin Delays Satellite Cell Activation and Maintains Quiescence. Stem Cells Int 2019; 2019:5980465. [PMID: 31249600 PMCID: PMC6561664 DOI: 10.1155/2019/5980465] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 10/29/2018] [Accepted: 12/25/2018] [Indexed: 02/07/2023] Open
Abstract
The regeneration of the muscle tissue relies on the capacity of the satellite stem cell (SC) population to exit quiescence, divide asymmetrically, proliferate, and differentiate. In age-related muscle atrophy (sarcopenia) and several dystrophies, regeneration cannot compensate for the loss of muscle tissue. These disorders are associated with the depletion of the satellite cell pool or with the loss of satellite cell functionality. Recently, the establishment and maintenance of quiescence in satellite cells have been linked to their metabolic state. In this work, we aimed to modulate metabolism in order to preserve the satellite cell pool. We made use of metformin, a calorie restriction mimicking drug, to ask whether metformin has an effect on quiescence, proliferation, and differentiation of satellite cells. We report that satellite cells, when treated with metformin in vitro, ex vivo, or in vivo, delay activation, Pax7 downregulation, and terminal myogenic differentiation. We correlate the metformin-induced delay in satellite cell activation with the inhibition of the ribosome protein RPS6, one of the downstream effectors of the mTOR pathway. Moreover, in vivo administration of metformin induces a belated regeneration of cardiotoxin- (CTX-) damaged skeletal muscle. Interestingly, satellite cells treated with metformin immediately after isolation are smaller in size and exhibit reduced pyronin Y levels, which suggests that metformin-treated satellite cells are transcriptionally less active. Thus, our study suggests that metformin delays satellite cell activation and differentiation by favoring a quiescent, low metabolic state.
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Summer R, Shaghaghi H, Schriner D, Roque W, Sales D, Cuevas-Mora K, Desai V, Bhushan A, Ramirez MI, Romero F. Activation of the mTORC1/PGC-1 axis promotes mitochondrial biogenesis and induces cellular senescence in the lung epithelium. Am J Physiol Lung Cell Mol Physiol 2019; 316:L1049-L1060. [PMID: 30892080 DOI: 10.1152/ajplung.00244.2018] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Cellular senescence is a biological process by which cells lose their capacity to proliferate yet remain metabolically active. Although originally considered a protective mechanism to limit the formation of cancer, it is now appreciated that cellular senescence also contributes to the development of disease, including common respiratory ailments such as chronic obstructive pulmonary disease and idiopathic pulmonary fibrosis. While many factors have been linked to the development of cellular senescence, mitochondrial dysfunction has emerged as an important causative factor. In this study, we uncovered that the mitochondrial biogenesis pathway driven by the mammalian target of rapamycin/peroxisome proliferator-activated receptor-γ complex 1α/β (mTOR/PGC-1α/β) axis is markedly upregulated in senescent lung epithelial cells. Using two different models, we show that activation of this pathway is associated with other features characteristic of enhanced mitochondrial biogenesis, including elevated number of mitochondrion per cell, increased oxidative phosphorylation, and augmented mitochondrial reactive oxygen species (ROS) production. Furthermore, we found that pharmacological inhibition of the mTORC1 complex with rapamycin not only restored mitochondrial homeostasis but also reduced cellular senescence to bleomycin in lung epithelial cells. Likewise, mitochondrial-specific antioxidant therapy also effectively inhibited mTORC1 activation in these cells while concomitantly reducing mitochondrial biogenesis and cellular senescence. In summary, this study provides a mechanistic link between mitochondrial biogenesis and cellular senescence in lung epithelium and suggests that strategies aimed at blocking the mTORC1/PGC-1α/β axis or reducing ROS-induced molecular damage could be effective in the treatment of senescence-associated lung diseases.
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Affiliation(s)
- Ross Summer
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Hoora Shaghaghi
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - DeLeila Schriner
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Willy Roque
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Dominic Sales
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Karina Cuevas-Mora
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Vilas Desai
- Department of Pharmaceutical Sciences, Jefferson College of Pharmacy, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Alok Bhushan
- Department of Pharmaceutical Sciences, Jefferson College of Pharmacy, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Maria I Ramirez
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
| | - Freddy Romero
- Center for Translational Medicine and Jane and Leonard Korman Lung Center, Thomas Jefferson University , Philadelphia, Pennsylvania
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Shi J, Surma M, Yang Y, Wei L. Disruption of both ROCK1 and ROCK2 genes in cardiomyocytes promotes autophagy and reduces cardiac fibrosis during aging. FASEB J 2019; 33:7348-7362. [PMID: 30848941 DOI: 10.1096/fj.201802510r] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this study, we investigated the pathophysiological impact of Rho-associated coiled-coil-containing protein kinase (ROCK)1 and ROCK2 double deletion vs. single deletion on cardiac remodeling. Utilizing a cardiomyocyte-specific and tamoxifen-inducible MerCreMer recombinase (MCM), 3 mouse lines (MCM/ROCK1fl/fl/ROCK2fl/fl, MCM/ROCK1fl/fl, and MCM/ROCK2fl/fl) were generated. As early as 5 d after inducible deletion, the double ROCK knockout hearts exhibited reduced phosphorylation of myosin light chain (MLC) and focal adhesion kinase (FAK), supporting a role for ROCK activity in regulating the nonsarcomeric cytoskeleton. Moreover, the autophagy marker microtubule-associated proteins 1A-1B light chain 3B was increased in the double ROCK knockout, and these early molecular features persisted throughout aging. Mechanistically, the double ROCK knockout promoted age-associated or starvation-induced autophagy concomitant with reduced protein kinase B (AKT), mammalian target of rapamycin (mTOR), Unc-51-like kinase signaling, and cardiac fibrosis. In contrast, ROCK2 knockout hearts showed increased phosphorylated (p)-MLC and p-FAK levels, which were mostly attributable to a compensatory ROCK1 overactivation. Autophagy was inhibited at the baseline accompanying increased mTOR activity, leading to increased cardiac fibrosis in the ROCK2 knockout hearts. Finally, the loss of ROCK1 had no significant effect on p-MLC and p-FAK levels, mTOR signaling, or autophagy at baseline. In summary, deletions of ROCK isoforms in cardiomyocytes have different, even opposite, effects on endogenous ROCK activity and the MLC/FAK/AKT/mTOR signaling pathway, which is involved in autophagy and fibrosis of the heart.-Shi, J., Surma, M., Yang, Y., Wei, L. Disruption of both ROCK1 and ROCK2 genes in cardiomyocytes promotes autophagy and reduces cardiac fibrosis during aging.
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Affiliation(s)
- Jianjian Shi
- Herman B. Wells Center for Pediatric Research, Department of Pediatrics, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Michelle Surma
- Herman B. Wells Center for Pediatric Research, Department of Pediatrics, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Yang Yang
- Herman B. Wells Center for Pediatric Research, Department of Pediatrics, School of Medicine, Indiana University, Indianapolis, Indiana, USA.,Department of Cardiovascular Surgery, Xiangya Hospital, Central South University School of Medicine, Changsha, China; and
| | - Lei Wei
- Herman B. Wells Center for Pediatric Research, Department of Pediatrics, School of Medicine, Indiana University, Indianapolis, Indiana, USA.,Department of Cellular and Integrative Physiology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
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Epigallocatechin gallate suppresses premature senescence of preadipocytes by inhibition of PI3K/Akt/mTOR pathway and induces senescent cell death by regulation of Bax/Bcl-2 pathway. Biogerontology 2018; 20:171-189. [PMID: 30456590 DOI: 10.1007/s10522-018-9785-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 11/13/2018] [Indexed: 01/05/2023]
Abstract
The phytochemical epigallocatechin gallate (EGCG) has been reported to alleviate age-associated immune disorders and organ dysfunction. However, information regarding the mechanistic role of EGCG in the suppression of cellular senescence is limited. The present study thus assessed the effects and underlying mechanisms of EGCG in the inhibition of senescence as well as its potential to selectively eliminate senescent cells (senolytics) using 3T3-L1 preadipocytes. Premature senescence was established in cells by repeated exposure of H2O2 at a sub-lethal concentration (150 μM). H2O2 treated cells showed characteristic senescence-associated features including increased cell size, senescence-associated β-galactosidase activity (SA-β-gal), development of senescence-associated secretory phenotype (SASP), activation of reactive oxygen species (ROS) and pathways, DNA damage as well as induction of cell cycle inhibitors (p53/p21WAF1/p16INK4a). In addition, a robust activation of PI3K/Akt/mTOR and AMPK pathways was also observed in H2O2 treated cells. Presence of EGCG (50 and 100 μM) showed significant downregulation of PI3K/Akt/mTOR and AMPK signaling along with the suppression of ROS, iNOS, Cox-2, NF-κB, SASP and p53 mediated cell cycle inhibition in preadipocytes. In addition, EGCG treatment also suppressed the accumulation of anti-apoptotic protein Bcl-2 in senescent cells thereby promoting apoptosis mediated cell death. Our results collectively show that EGCG acts as an mTOR inhibitor, SASP modulator as well as a potential senolytic agent thereby indicating its multi-faceted attributes that could be useful for developing anti-aging or age-delaying therapies.
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Wilkinson D, Piasecki M, Atherton P. The age-related loss of skeletal muscle mass and function: Measurement and physiology of muscle fibre atrophy and muscle fibre loss in humans. Ageing Res Rev 2018; 47:123-132. [PMID: 30048806 PMCID: PMC6202460 DOI: 10.1016/j.arr.2018.07.005] [Citation(s) in RCA: 357] [Impact Index Per Article: 59.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/20/2018] [Accepted: 07/18/2018] [Indexed: 12/11/2022]
Abstract
Loss of muscle mass with age is due to atrophy and loss of individual muscle fibres. Anabolic resistance is fundamental in age-related fibre atrophy. Fibre loss is associated with denervation and remodelling of motor units. The plasticity of both factors should be considered in future research.
Age-related loss of skeletal muscle mass and function, sarcopenia, is associated with physical frailty and increased risk of morbidity (chronic diseases), in addition to all-cause mortality. The loss of muscle mass occurs incipiently from middle-age (∼1%/year), and in severe instances can lead to a loss of ∼50% by the 8–9th decade of life. This review will focus on muscle deterioration with ageing and highlight the two underpinning mechanisms regulating declines in muscle mass and function: muscle fibre atrophy and muscle fibre loss (hypoplasia) – and their measurement. The mechanisms of muscle fibre atrophy in humans relate to imbalances in muscle protein synthesis (MPS) and breakdown (MPB); however, since there is limited evidence for basal alterations in muscle protein turnover, it would appear that “anabolic resistance” to fundamental environmental cues regulating diurnal muscle homeostasis (namely physical activity and nutrition), underlie age-related catabolic perturbations in muscle proteostasis. While the ‘upstream’ drivers of the desensitization of aged muscle to anabolic stimuli are poorly defined, they most likely relate to impaired efficiency of the conversion of nutritional/exercise stimuli into signalling impacting mRNA translation and proteolysis. Additionally, loss of muscle fibres has been shown in cadaveric studies using anatomical fibre counts, and from iEMG studies demonstrating motor unit loss, albeit with few molecular investigations of this in humans. We suggest that defining countermeasures against sarcopenia requires improved understandings of the co-ordinated regulation of muscle fibre atrophy and fibre loss, which are likely to be inextricably linked.
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Manzella N, Santin Y, Maggiorani D, Martini H, Douin-Echinard V, Passos JF, Lezoualc'h F, Binda C, Parini A, Mialet-Perez J. Monoamine oxidase-A is a novel driver of stress-induced premature senescence through inhibition of parkin-mediated mitophagy. Aging Cell 2018; 17:e12811. [PMID: 30003648 PMCID: PMC6156293 DOI: 10.1111/acel.12811] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 05/23/2018] [Accepted: 05/28/2018] [Indexed: 12/21/2022] Open
Abstract
Cellular senescence, the irreversible cell cycle arrest observed in somatic cells, is an important driver of age‐associated diseases. Mitochondria have been implicated in the process of senescence, primarily because they are both sources and targets of reactive oxygen species (ROS). In the heart, oxidative stress contributes to pathological cardiac ageing, but the mechanisms underlying ROS production are still not completely understood. The mitochondrial enzyme monoamine oxidase‐A (MAO‐A) is a relevant source of ROS in the heart through the formation of H2O2 derived from the degradation of its main substrates, norepinephrine (NE) and serotonin. However, the potential link between MAO‐A and senescence has not been previously investigated. Using cardiomyoblasts and primary cardiomyocytes, we demonstrate that chronic MAO‐A activation mediated by synthetic (tyramine) and physiological (NE) substrates induces ROS‐dependent DNA damage response, activation of cyclin‐dependent kinase inhibitors p21cip, p16ink4a, and p15ink4b and typical features of senescence such as cell flattening and SA‐β‐gal activity. Moreover, we observe that ROS produced by MAO‐A lead to the accumulation of p53 in the cytosol where it inhibits parkin, an important regulator of mitophagy, resulting in mitochondrial dysfunction. Additionally, we show that the mTOR kinase contributes to mitophagy dysfunction by enhancing p53 cytoplasmic accumulation. Importantly, restoration of mitophagy, either by overexpression of parkin or inhibition of mTOR, prevents mitochondrial dysfunction and induction of senescence. Altogether, our data demonstrate a novel link between MAO‐A and senescence in cardiomyocytes and provides mechanistic insights into the potential role of MAO‐dependent oxidative stress in age‐related pathologies.
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Affiliation(s)
- Nicola Manzella
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
- Department of Biology and Biotechnology; University of Pavia; Pavia Italy
| | - Yohan Santin
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Damien Maggiorani
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Hélène Martini
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Victorine Douin-Echinard
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Joao F. Passos
- Ageing Research Laboratories; Newcastle University Institute for Ageing, Newcastle University; Newcastle upon Tyne UK
| | - Frank Lezoualc'h
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Claudia Binda
- Department of Biology and Biotechnology; University of Pavia; Pavia Italy
| | - Angelo Parini
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
| | - Jeanne Mialet-Perez
- Institute of Metabolic and Cardiovascular Diseases (I2MC); Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse; Toulouse France
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Nacarelli T, Azar A, Altinok O, Orynbayeva Z, Sell C. Rapamycin increases oxidative metabolism and enhances metabolic flexibility in human cardiac fibroblasts. GeroScience 2018; 40:10.1007/s11357-018-0030-2. [PMID: 29931650 PMCID: PMC6060207 DOI: 10.1007/s11357-018-0030-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 06/14/2018] [Indexed: 01/07/2023] Open
Abstract
Inhibition of mTOR signaling using rapamycin has been shown to increase lifespan and healthspan in multiple model organisms; however, the precise mechanisms for the beneficial effects of rapamycin remain uncertain. We have previously reported that rapamycin delays senescence in human cells and that enhanced mitochondrial biogenesis and protection from mitochondrial stress is one component of the benefit provided by rapamycin treatment. Here, using two models of senescence, replicative senescence and senescence induced by the presence of the Hutchinson-Gilford progeria lamin A mutation, we report that senescence is accompanied by elevated glycolysis and increased oxidative phosphorylation, which are both reduced by rapamycin. Measurements of mitochondrial function indicate that direct mitochondria targets of rapamycin are succinate dehydrogenase and matrix alanine aminotransferase. Elevated activity of these enzymes could be part of complex mechanisms that enable mitochondria to resume their optimal oxidative phosphorylation and resist senescence. This interpretation is supported by the fact that rapamycin-treated cultures do not undergo a premature senescence in response to the replacement of glucose with galactose in the culture medium, which forces a greater reliance on oxidative phosphorylation. Additionally, long-term treatment with rapamycin increases expression of the mitochondrial carrier protein UCP2, which facilitates the movement of metabolic intermediates across the mitochondrial membrane. The results suggest that rapamycin impacts mitochondrial function both through direct interaction with the mitochondria and through altered gene expression of mitochondrial carrier proteins.
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Affiliation(s)
| | - Ashley Azar
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA, 19102, USA
| | - Oya Altinok
- Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA, 19102, USA
| | - Zulfiya Orynbayeva
- Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA, 19102, USA
| | - Christian Sell
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA, 19102, USA.
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Carroll B, Korolchuk VI. Nutrient sensing, growth and senescence. FEBS J 2018; 285:1948-1958. [PMID: 29405586 PMCID: PMC6001427 DOI: 10.1111/febs.14400] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 01/15/2018] [Accepted: 01/30/2018] [Indexed: 12/19/2022]
Abstract
Cell growth is dictated by a wide range of mitogenic signals, the amplitude and relative contribution of which vary throughout development, differentiation and in a tissue-specific manner. The ability to sense and appropriately respond to changes in mitogens is fundamental to control cell growth, and reduced responsiveness of nutrient sensing pathways is widely associated with human disease and ageing. Cellular senescence is an important tumour suppressor mechanism that is characterised by an irreversible exit from the cell cycle in response to replicative exhaustion or excessive DNA damage. Despite the fact that senescent cells can no longer divide, they remain metabolically active and display a range of pro-growth phenotypes that are supported in part by the mTORC1-autophagy signalling axis. As our understanding of the basic mechanisms of controlling mTORC1-autophagy activity and cell growth continues to expand, we are able to explore how changes in nutrient sensing contribute to the acquisition and maintenance of cellular senescence. Furthermore, while the protective effect of senescence to limit cellular transformation is clear, more recently, the age-related accumulation of these pro-inflammatory senescent cells has been shown to contribute to a decline in organismal fitness. We will further discuss whether dysregulation of nutrient sensing pathways can be targeted to promote senescent cell death which would have important implications for healthy ageing.
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Accelerated aging in schizophrenia and related disorders: Future research. Schizophr Res 2018; 196:4-8. [PMID: 28689755 DOI: 10.1016/j.schres.2017.06.034] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 06/15/2017] [Accepted: 06/19/2017] [Indexed: 01/17/2023]
Abstract
Several lines of evidence suggest schizophrenia is a segmental progeria, that is, some but not all aspects of accelerated aging may be present. However, the evidence has not been consistent. Problems with matching and confounding may account for some of these discrepancies. Given the etiopathophysiological heterogeneity of schizophrenia, it is possible that only a specific pathophysiological group within schizophrenia is associated with progeroid features, while others are not, or that one group is associated with a particular segment of aging features, while other progeroid features are found in another pathophysiological subgroup. In the aging research field, significant progress has been made in identifying the molecular pathways that confer aging: epigenetic changes, inflammation, proteostasis, adult stem cell function, metabolic changes, and adaptation to stress, and macromolecular damage. In addition to replication and clarification of existing kinds of evidence, examining these aging pathways would improve our understanding of progeria in schizophrenia.
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Maher P, Conti B. Deciphering the pathways that protect from IL-13-mediated potentiation of oxidative stress-induced dopaminergic nerve cell death. Cytokine 2018; 103:114-120. [PMID: 28969943 PMCID: PMC5808859 DOI: 10.1016/j.cyto.2017.09.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 08/31/2017] [Accepted: 09/18/2017] [Indexed: 01/27/2023]
Abstract
The majority of Parkinson's disease (PD) cases are sporadic with only about 10% of PD patients having a family history of the disease suggesting that this neurodegenerative disorder is the result of both environmental and genetic factors. Both oxidative stress and neuroinflammation are thought to contribute to PD. Previously, we showed that the activation of interleukin 13 receptor alpha 1 (IL-13Rα1) increases the sensitivity of dopaminergic neurons to oxidative damage both in cultured cells and in animals. In this study, we investigated the pathways involved in the IL-13-mediated potentiation of oxidative stress-induced dopaminergic cell death using a combination of cell survival assays and Western blotting with appropriate antibodies. In addition, siRNA was used to examine the role of 4E-BP1 in this cell toxicity paradigm. We show that activation of both the Jak-Stat and PI3 kinase-mTOR pathways play key roles in the promotion of cell death by IL-13 in the presence of mild oxidative stress. The Jak 1/2 inhibitor ruxolitinib, the mTOR inhibitor rapamycin and the PI3 kinase inhibitor LY294002 all prevented the potentiation of cell death by IL-13. Moreover, 4E-BP1, a target of mTOR, appeared to mediate the protective effects of rapamycin. Together, these results indicate that multiple signaling pathways downstream of IL-13Rα1 activation play a role in the toxic effects of IL-13 in dopaminergic neurons in the presence of mild oxidative stress and suggest that any of these pathways might provide potential targets for the treatment of PD.
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Affiliation(s)
- Pamela Maher
- The Salk Institute for Biological Studies, 10010 N. Torrey Pines Rd., La Jolla, CA 92037, United States.
| | - Bruno Conti
- The Scripps Research Institute, 10550 N. Torrey Pines Rd., La Jolla, CA 92037, United States
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Epigenetic alterations in longevity regulators, reduced life span, and exacerbated aging-related pathology in old father offspring mice. Proc Natl Acad Sci U S A 2018; 115:E2348-E2357. [PMID: 29467291 PMCID: PMC5877957 DOI: 10.1073/pnas.1707337115] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Advanced age is not only a major risk factor for a range of disorders within an aging individual but may also enhance susceptibility for disease in the next generation. In humans, advanced paternal age has been associated with increased risk for a number of diseases. Experiments in rodent models have provided initial evidence that paternal age can influence behavioral traits in offspring animals, but the overall scope and extent of paternal age effects on health and disease across the life span remain underexplored. Here, we report that old father offspring mice showed a reduced life span and an exacerbated development of aging traits compared with young father offspring mice. Genome-wide epigenetic analyses of sperm from aging males and old father offspring tissue identified differentially methylated promoters, enriched for genes involved in the regulation of evolutionarily conserved longevity pathways. Gene expression analyses, biochemical experiments, and functional studies revealed evidence for an overactive mTORC1 signaling pathway in old father offspring mice. Pharmacological mTOR inhibition during the course of normal aging ameliorated many of the aging traits that were exacerbated in old father offspring mice. These findings raise the possibility that inherited alterations in longevity pathways contribute to intergenerational effects of aging in old father offspring mice.
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Nacarelli T, Sell C. Targeting metabolism in cellular senescence, a role for intervention. Mol Cell Endocrinol 2017; 455:83-92. [PMID: 27591812 DOI: 10.1016/j.mce.2016.08.049] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 07/29/2016] [Accepted: 08/30/2016] [Indexed: 01/06/2023]
Abstract
Cellular senescence has gained much attention as a contributor to aging and susceptibility to disease. Senescent cells undergo a stable cell cycle arrest and produce pro-inflammatory cytokines. However, an additional feature of the senescence phenotype is an altered metabolic state. Despite maintaining a non-dividing state, senescent cells display a high metabolic rate. Metabolic changes characteristic of replicative senescence include altered mitochondrial function and perturbations in growth signaling pathways, such as the mTORC1-signaling pathway. Recent evidence has raised the possibility that these metabolic changes may be essential for the induction and maintenance of the senescent state. Interventions such as rapamycin treatment and methionine restriction impact key aspects of metabolism and delay cellular senescence to extend cellular lifespan. Here, we review the metabolic changes and potential metabolic regulators of the senescence program. In addition, we will discuss how lifespan-extending regimens prevent metabolic stress that accompanies and potentially regulates the senescence program.
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Affiliation(s)
- Timothy Nacarelli
- Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA 19102, USA
| | - Christian Sell
- Drexel University College of Medicine, 245 North 15th Street, Philadelphia, PA 19102, USA.
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Tan WJT, Song L, Graham M, Schettino A, Navaratnam D, Yarbrough WG, Santos-Sacchi J, Ivanova AV. Novel Role of the Mitochondrial Protein Fus1 in Protection from Premature Hearing Loss via Regulation of Oxidative Stress and Nutrient and Energy Sensing Pathways in the Inner Ear. Antioxid Redox Signal 2017; 27:489-509. [PMID: 28135838 PMCID: PMC5564041 DOI: 10.1089/ars.2016.6851] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
AIMS Acquired hearing loss is a worldwide epidemic that affects all ages. It is multifactorial in etiology with poorly characterized molecular mechanisms. Mitochondria are critical components in hearing. Here, we aimed to identify the mechanisms of mitochondria-dependent hearing loss using Fus1 KO mice, our novel model of mitochondrial dysfunction/oxidative stress. RESULTS Using auditory brainstem responses (ABRs), we characterized the Fus1 KO mouse as a novel, clinically relevant model of age-related hearing loss (ARHL) of metabolic etiology. We demonstrated early decline of the endocochlear potential (EP) that may occur due to severe mitochondrial and vascular pathologies in the Fus1 KO cochlear stria vascularis. We showed that pathological alterations in antioxidant (AO) and nutrient and energy sensing pathways (mTOR and PTEN/AKT) occur in cochleae of young Fus1 KO mice before major hearing loss. Importantly, short-term AO treatment corrected pathological molecular changes, while longer AO treatment restored EP, improved ABR parameters, restored mitochondrial structure, and delayed the development of hearing loss in the aging mouse. INNOVATION Currently, no molecular mechanisms linked to metabolic ARHL have been identified. We established pathological and molecular mechanisms that link the disease to mitochondrial dysfunction and oxidative stress. CONCLUSION Since chronic mitochondrial dysfunction is common in many patients, it could lead to developing hearing loss that can be alleviated/rescued by AO treatment. Our study creates a framework for clinical trials and introduces the Fus1 KO model as a powerful platform for developing novel therapeutic strategies to prevent/delay hearing loss associated with mitochondrial dysfunction. Antioxid. Redox Signal. 27, 489-509.
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Affiliation(s)
- Winston J T Tan
- 1 Department of Surgery, Section of Otolaryngology, Yale University School of Medicine , New Haven, Connecticut
| | - Lei Song
- 2 Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai, China .,3 Ear Institute, Shanghai Jiao Tong University School of Medicine , Shanghai, China .,4 Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases , Shanghai, China
| | - Morven Graham
- 5 CCMI EM Core Facility, Yale University School of Medicine , New Haven, Connecticut
| | | | - Dhasakumar Navaratnam
- 7 Department of Neurology, Yale University School of Medicine , New Haven, Connecticut.,8 Department of Neuroscience, Yale University School of Medicine , New Haven, Connecticut
| | - Wendell G Yarbrough
- 1 Department of Surgery, Section of Otolaryngology, Yale University School of Medicine , New Haven, Connecticut.,9 Department of Pathology, Yale University School of Medicine , New Haven, Connecticut
| | - Joseph Santos-Sacchi
- 1 Department of Surgery, Section of Otolaryngology, Yale University School of Medicine , New Haven, Connecticut.,8 Department of Neuroscience, Yale University School of Medicine , New Haven, Connecticut.,10 Department of Cellular and Molecular Physiology, Yale University School of Medicine , New Haven, Connecticut
| | - Alla V Ivanova
- 1 Department of Surgery, Section of Otolaryngology, Yale University School of Medicine , New Haven, Connecticut
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