101
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Iriyama S, Yasuda M, Nishikawa S, Takai E, Hosoi J, Amano S. Decrease of laminin-511 in the basement membrane due to photoaging reduces epidermal stem/progenitor cells. Sci Rep 2020; 10:12592. [PMID: 32724130 PMCID: PMC7387558 DOI: 10.1038/s41598-020-69558-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 07/14/2020] [Indexed: 02/08/2023] Open
Abstract
Daily sunlight exposure damages the epidermal basement membrane (BM) and disrupts epidermal homeostasis. Inter-follicular epidermal stem cells (IFE-SCs) regulate epidermal proliferation and differentiation, which supports epidermal homeostasis. Here, we examine how photoaging affects the function of IFE-SCs and we identify key components in their cellular environment (niche). We found that sun-exposed skin showed a decrease of MCSP-positive and β1-integrin-positive cells concomitantly with a decrease of laminin-511 at the dermal-epidermal junction (DEJ), as compared with sun-protected skin. Higher levels of laminin-511 were associated with not only increased efficiency of colony formation, but also higher expression levels of MCSP as well as other stem cell markers such as Lrig1, ITGB1, CD44, CD46, DLL1, and K15 in keratinocytes from skin of 12- to 62-year-old subjects. UVB exposure to cultured human skin impaired laminin-511 integrity at the dermal-epidermal junction and reduced MCSP-positive basal epidermal cells as well as K15-positive cells. Combined treatment with matrix metalloproteinase and heparanase inhibitors protected the integrity of laminin-511 and inhibited the reduction of MCSP-positive cells and K15-positive cells. These results suggest that photoaging may reduce the levels of MCSP-positive and K15-positive epidermal stem/progenitor cells in the epidermis via loss of laminin-511 at the dermal-epidermal junction.
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Affiliation(s)
- Shunsuke Iriyama
- Shiseido Global Innovation Center, 1-2-11 Takashima, Nishi-ku, Yokohama, 220-0011, Japan.
| | - Masahito Yasuda
- Department of Dermatology, Gunma University Graduate School of Medicine, 3-39-22 Showa-Machi, Maebashi, Gunma, 371-8511, Japan
| | - Saori Nishikawa
- Shiseido Global Innovation Center, 1-2-11 Takashima, Nishi-ku, Yokohama, 220-0011, Japan
| | - Eisuke Takai
- Shiseido Global Innovation Center, 1-2-11 Takashima, Nishi-ku, Yokohama, 220-0011, Japan
| | - Junichi Hosoi
- Shiseido Global Innovation Center, 1-2-11 Takashima, Nishi-ku, Yokohama, 220-0011, Japan
| | - Satoshi Amano
- Shiseido Global Innovation Center, 1-2-11 Takashima, Nishi-ku, Yokohama, 220-0011, Japan
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102
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Navarro Negredo P, Yeo RW, Brunet A. Aging and Rejuvenation of Neural Stem Cells and Their Niches. Cell Stem Cell 2020; 27:202-223. [PMID: 32726579 DOI: 10.1016/j.stem.2020.07.002] [Citation(s) in RCA: 111] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Aging has a profound and devastating effect on the brain. Old age is accompanied by declining cognitive function and enhanced risk of brain diseases, including cancer and neurodegenerative disorders. A key question is whether cells with regenerative potential contribute to brain health and even brain "rejuvenation." This review discusses mechanisms that regulate neural stem cells (NSCs) during aging, focusing on the effect of metabolism, genetic regulation, and the surrounding niche. We also explore emerging rejuvenating strategies for old NSCs. Finally, we consider how new technologies may help harness NSCs' potential to restore healthy brain function during physiological and pathological aging.
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Affiliation(s)
| | - Robin W Yeo
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
| | - Anne Brunet
- Department of Genetics, Stanford University, Stanford, CA 94305, USA; Glenn Laboratories for the Biology of Aging, Stanford, CA 94305, USA.
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103
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Grison A, Atanasoski S. Cyclins, Cyclin-Dependent Kinases, and Cyclin-Dependent Kinase Inhibitors in the Mouse Nervous System. Mol Neurobiol 2020; 57:3206-3218. [PMID: 32506380 DOI: 10.1007/s12035-020-01958-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Accepted: 05/26/2020] [Indexed: 12/11/2022]
Abstract
Development and normal physiology of the nervous system require proliferation and differentiation of stem and progenitor cells in a strictly controlled manner. The number of cells generated depends on the type of cell division, the cell cycle length, and the fraction of cells that exit the cell cycle to become quiescent or differentiate. The underlying processes are tightly controlled and modulated by cyclin-dependent kinases (Cdks) and their interactions with cyclins and Cdk inhibitors (CKIs). Studies performed in the nervous system with mouse models lacking individual Cdks, cyclins, and CKIs, or combinations thereof, have shown that many of these molecules control proliferation rates in a cell-type specific and time-dependent manner. In this review, we will provide an update on the in vivo studies on cyclins, Cdks, and CKIs in neuronal and glial tissue. The goal is to highlight their impact on proliferation processes during the development of the peripheral and central nervous system, including and comparing normal and pathological conditions in the adult.
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Affiliation(s)
- Alice Grison
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Suzana Atanasoski
- Department of Biomedicine, University of Basel, Basel, Switzerland. .,Faculty of Medicine, University of Zurich, Zurich, Switzerland.
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104
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Linc-FOXD3 knockdown enhances hippocampal NSCs activation through upregulation of the Wnt/β-catenin pathway. Neurosci Lett 2020; 729:134991. [DOI: 10.1016/j.neulet.2020.134991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 03/31/2020] [Accepted: 04/14/2020] [Indexed: 12/12/2022]
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105
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Kimata Y, Leturcq M, Aradhya R. Emerging roles of metazoan cell cycle regulators as coordinators of the cell cycle and differentiation. FEBS Lett 2020; 594:2061-2083. [PMID: 32383482 DOI: 10.1002/1873-3468.13805] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/17/2020] [Accepted: 04/20/2020] [Indexed: 01/10/2023]
Abstract
In multicellular organisms, cell proliferation must be tightly coordinated with other developmental processes to form functional tissues and organs. Despite significant advances in our understanding of how the cell cycle is controlled by conserved cell-cycle regulators (CCRs), how the cell cycle is coordinated with cell differentiation in metazoan organisms and how CCRs contribute to this process remain poorly understood. Here, we review the emerging roles of metazoan CCRs as intracellular proliferation-differentiation coordinators in multicellular organisms. We illustrate how major CCRs regulate cellular events that are required for cell fate acquisition and subsequent differentiation. To this end, CCRs employ diverse mechanisms, some of which are separable from those underpinning the conventional cell-cycle-regulatory functions of CCRs. By controlling cell-type-specific specification/differentiation processes alongside the progression of the cell cycle, CCRs enable spatiotemporal coupling between differentiation and cell proliferation in various developmental contexts in vivo. We discuss the significance and implications of this underappreciated role of metazoan CCRs for development, disease and evolution.
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Affiliation(s)
- Yuu Kimata
- School of Life Science and Technology, ShanghaiTech University, China
| | - Maïté Leturcq
- School of Life Science and Technology, ShanghaiTech University, China
| | - Rajaguru Aradhya
- School of Biotechnology, Amrita Vishwa Vidyapeetham, Kollam, Kerala, India
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106
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Hu G, Xia Y, Zhang J, Chen Y, Yuan J, Niu X, Zhao B, Li Q, Wang Y, Deng Z. ESC-sEVs Rejuvenate Senescent Hippocampal NSCs by Activating Lysosomes to Improve Cognitive Dysfunction in Vascular Dementia. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1903330. [PMID: 32440476 PMCID: PMC7237844 DOI: 10.1002/advs.201903330] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/20/2020] [Accepted: 02/24/2020] [Indexed: 05/05/2023]
Abstract
Vascular dementia (VD) is one of the most common types of dementia, however, the intrinsic mechanism is unclear and there is still lack of effective medications. In this study, the VD rats exhibit a progressive cognitive impairment, as well as a time-related increasing in hippocampal neural stem cells (H-NSCs) senescence, lost and neurogenesis decline. Then, embryonic stem cell-derived small extracellular vesicles (ESC-sEVs) are intravenously injected into VD rats. ESC-sEVs treatment significantly alleviates H-NSCs senescence, recovers compromised proliferation and neuron differentiation capacity, and reverses cognitive impairment. By microarray analysis and RT-qPCR it is identified that several miRNAs including miR-17-5p, miR-18a-5p, miR-21-5p, miR-29a-3p, and let-7a-5p, that can inhibit mTORC1 activation, exist in ESC-sEVs. ESC-sEVs rejuvenate H-NSCs senescence partly by transferring these miRNAs to inhibit mTORC1 activation, promote transcription factor EB (TFEB) nuclear translocation and lysosome resumption. Taken together, these data indicate that H-NSCs senescence cause cell depletion, neurogenesis reduction, and cognitive impairment in VD. ESC-sEVs treatment ameliorates H-NSCs senescence by inhibiting mTORC1 activation, and promoting TFEB nuclear translocation and lysosome resumption, thereby reversing senescence-related neurogenesis dysfunction and cognitive impairment in VD. The application of ESC-sEVs may be a novel cell-free therapeutic tool for patients with VD, as well as other aging-related diseases.
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Affiliation(s)
- Guowen Hu
- Department of NeurosurgeryShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Yuguo Xia
- Department of NeurosurgeryShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Juntao Zhang
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Yu Chen
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Ji Yuan
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Xin Niu
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Bizeng Zhao
- Department of Orthopedic SurgeryShanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai200233China
| | - Qing Li
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Yang Wang
- Institute of Microsurgery on ExtremitiesShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
| | - Zhifeng Deng
- Department of NeurosurgeryShanghai Jiaotong University Affiliated Sixth People's HospitalShanghai200233China
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107
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Criqui M, Qamra A, Chu TW, Sharma M, Tsao J, Henry DA, Barsyte-Lovejoy D, Arrowsmith CH, Winegarden N, Lupien M, Harrington L. Telomere dysfunction cooperates with epigenetic alterations to impair murine embryonic stem cell fate commitment. eLife 2020; 9:47333. [PMID: 32297856 PMCID: PMC7192583 DOI: 10.7554/elife.47333] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 04/06/2020] [Indexed: 12/11/2022] Open
Abstract
The precise relationship between epigenetic alterations and telomere dysfunction is still an extant question. Previously, we showed that eroded telomeres lead to differentiation instability in murine embryonic stem cells (mESCs) via DNA hypomethylation at pluripotency-factor promoters. Here, we uncovered that telomerase reverse transcriptase null (Tert-/-) mESCs exhibit genome-wide alterations in chromatin accessibility and gene expression during differentiation. These changes were accompanied by an increase of H3K27me3 globally, an altered chromatin landscape at the Pou5f1/Oct4 promoter, and a refractory response to differentiation cues. Inhibition of the Polycomb Repressive Complex 2 (PRC2), an H3K27 tri-methyltransferase, exacerbated the impairment in differentiation and pluripotency gene repression in Tert-/-mESCs but not wild-type mESCs, whereas inhibition of H3K27me3 demethylation led to a partial rescue of the Tert-/- phenotype. These data reveal a new interdependent relationship between H3K27me3 and telomere integrity in stem cell lineage commitment that may have implications in aging and cancer.
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Affiliation(s)
- Mélanie Criqui
- Institut de Recherche en Immunologie et Cancérologie (IRIC), Département de biologie moléculaire, Faculté de Médecine, Université de Montréal, Montréal, Canada
| | - Aditi Qamra
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Tsz Wai Chu
- Institut de Recherche en Immunologie et Cancérologie (IRIC), Département de biologie moléculaire, Faculté de Médecine, Université de Montréal, Montréal, Canada
| | - Monika Sharma
- Princess Margaret Genomics Centre, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Julissa Tsao
- Princess Margaret Genomics Centre, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Danielle A Henry
- Institut de Recherche en Immunologie et Cancérologie (IRIC), Département de biologie moléculaire, Faculté de Médecine, Université de Montréal, Montréal, Canada
| | - Dalia Barsyte-Lovejoy
- Structural Genomics Consortium, Princess Margaret Cancer Centre, University of Toronto, Department of Medical Biophysics, Toronto, Canada
| | - Cheryl H Arrowsmith
- Structural Genomics Consortium, Princess Margaret Cancer Centre, University of Toronto, Department of Medical Biophysics, Toronto, Canada
| | - Neil Winegarden
- Princess Margaret Genomics Centre, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Mathieu Lupien
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Lea Harrington
- Institut de Recherche en Immunologie et Cancérologie (IRIC), Département de biologie moléculaire, Faculté de Médecine, Université de Montréal, Montréal, Canada
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108
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Larrick JW, Mendelsohn AR. Roads to the Fountain of Youth? Rejuvenating Intestinal Stem Cells. Rejuvenation Res 2020; 22:342-347. [PMID: 31364468 DOI: 10.1089/rej.2019.2251] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The intestinal stem cells (ISCs) of old mice and humans exhibit a reduced capacity for regeneration and repair. Compromised intestinal function may play a key role in systemic aging-related changes: not only in the affected gut, but also in the nervous and cardiovascular systems. For example, progression of age-related neurodegenerative diseases such as Alzheimer's and Parkinson's has been linked to increased inflammation from gut microbiota in old mammals, which, in turn, may be linked bidirectionally with reduced ISC function. Intestinal organoid formation has been used to dissect the mechanisms of decline of ISC function. Alterations of the Wnt pathway, including downregulation of Wnt ligands in ISCs and upregulation of Wnt ligand inhibitor Notum in Paneth cells, and dysregulation of mTORC1 contribute to the observed age-related decline. Short-term fasting, caloric restriction, and peroxisome proliferator-activated receptor delta agonists have been reported to increase ISC function in adult mice. Moreover, the mTOR inhibitor rapamycin, NAD+ precursor nicotinamide riboside, and ABC99, a small molecule Notum inhibitor, have all been reported to rejuvenate ISC function in old mice and thus may have promise in humans. However, there is some controversy over the key mechanisms involved in loss of function of ISCs, which likely results, in part, from differences in how the in vitro organoid assays are performed. Moreover, how the microbiome modulates the function of ISCs and vice versa remains to be elucidated.
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Affiliation(s)
- James W Larrick
- 1Panorama Research Institute, Sunnyvale, California.,2Regenerative Sciences Institute, Sunnyvale, California
| | - Andrew R Mendelsohn
- 1Panorama Research Institute, Sunnyvale, California.,2Regenerative Sciences Institute, Sunnyvale, California
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109
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Ceccarelli M, D’Andrea G, Micheli L, Tirone F. Interaction Between Neurogenic Stimuli and the Gene Network Controlling the Activation of Stem Cells of the Adult Neurogenic Niches, in Physiological and Pathological Conditions. Front Cell Dev Biol 2020; 8:211. [PMID: 32318568 PMCID: PMC7154047 DOI: 10.3389/fcell.2020.00211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 03/11/2020] [Indexed: 12/26/2022] Open
Abstract
In the adult mammalian brain new neurons are continuously generated throughout life in two niches, the dentate gyrus of the hippocampus and the subventricular zone. This process, called adult neurogenesis, starts from stem cells, which are activated and enter the cell cycle. The proliferative capability of stem cells progressively decreases during aging. The population of stem cells is generally quiescent, and it is not clear whether the potential for stem cells to expand is limited, or whether they can expand and then return to quiescence, remaining available for further activation. Certain conditions may deregulate stem cells quiescence and self-renewal. In fact we discuss the possibility of activation of stem cells by neurogenic stimuli as a function of the intensity of the stimulus (i.e., whether this is physiological or pathological), and of the deregulation of the system (i.e., whether the model is aged or carrying genetic mutations in the gene network controlling quiescence). It appears that when the system is aged and/or carrying mutations of quiescence-maintaining genes, preservation of the quiescent state of stem cells is more critical and stem cells can be activated by a neurogenic stimulus which is ineffective in normal conditions. Moreover, when a neurogenic stimulus is in itself a cause of brain damage (e.g., kainic acid treatment) the activation of stem cells occurs bypassing any inhibitory control. Plausibly, with strong neurogenic stimuli, such as kainic acid injected into the dentate gyrus, the self-renewal capacity of stem cells may undergo rapid exhaustion. However, the self-renewal capability of stem cells persists when normal stimuli are elicited in the presence of a mutation of one of the quiescence-maintaining genes, such as p16Ink4a, p21Cip1 or Btg1. In this case, stem cells become promptly activated by a neurogenic stimulus even during aging. This indicates that stem cells retain a high proliferative capability and plasticity, and suggests that stem cells are protected against the response to stimulus and are resilient to exhaustion. It will be interesting to assess at which functional degree of deregulation of the quiescence-maintaining system, stem cells will remain responsive to repeated neurogenic stimuli without undergoing exhaustion of their pool.
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Affiliation(s)
| | | | | | - Felice Tirone
- Institute of Biochemistry and Cell Biology, National Research Council (IBBC-CNR), Rome, Italy
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110
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D’Andrea G, Ceccarelli M, Bernini R, Clemente M, Santi L, Caruso C, Micheli L, Tirone F. Hydroxytyrosol stimulates neurogenesis in aged dentate gyrus by enhancing stem and progenitor cell proliferation and neuron survival. FASEB J 2020; 34:4512-4526. [DOI: 10.1096/fj.201902643r] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 12/31/2019] [Accepted: 01/16/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Giorgio D’Andrea
- Institute of Biochemistry and Cell Biology National Research Council (IBBC‐CNR) Monterotondo, Rome Italy
- Department of Ecological and Biological Sciences University of Tuscia Viterbo Italy
| | - Manuela Ceccarelli
- Institute of Biochemistry and Cell Biology National Research Council (IBBC‐CNR) Monterotondo, Rome Italy
| | - Roberta Bernini
- Department of Agriculture and Forest Sciences (DAFNE) University of Tuscia Viterbo Italy
| | - Mariangela Clemente
- Department of Agriculture and Forest Sciences (DAFNE) University of Tuscia Viterbo Italy
| | - Luca Santi
- Department of Agriculture and Forest Sciences (DAFNE) University of Tuscia Viterbo Italy
| | - Carla Caruso
- Department of Ecological and Biological Sciences University of Tuscia Viterbo Italy
| | - Laura Micheli
- Institute of Biochemistry and Cell Biology National Research Council (IBBC‐CNR) Monterotondo, Rome Italy
| | - Felice Tirone
- Institute of Biochemistry and Cell Biology National Research Council (IBBC‐CNR) Monterotondo, Rome Italy
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111
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Zambusi A, Pelin Burhan Ö, Di Giaimo R, Schmid B, Ninkovic J. Granulins Regulate Aging Kinetics in the Adult Zebrafish Telencephalon. Cells 2020; 9:E350. [PMID: 32028681 PMCID: PMC7072227 DOI: 10.3390/cells9020350] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/31/2020] [Accepted: 01/31/2020] [Indexed: 12/26/2022] Open
Abstract
Granulins (GRN) are secreted factors that promote neuronal survival and regulate inflammation in various pathological conditions. However, their roles in physiological conditions in the brain remain poorly understood. To address this knowledge gap, we analysed the telencephalon in Grn-deficient zebrafish and identified morphological and transcriptional changes in microglial cells, indicative of a pro-inflammatory phenotype in the absence of any insult. Unexpectedly, activated mutant microglia shared part of their transcriptional signature with aged human microglia. Furthermore, transcriptome profiles of the entire telencephali isolated from young Grn-deficient animals showed remarkable similarities with the profiles of the telencephali isolated from aged wildtype animals. Additionally, 50% of differentially regulated genes during aging were regulated in the telencephalon of young Grn-deficient animals compared to their wildtype littermates. Importantly, the telencephalon transcriptome in young Grn-deficent animals changed only mildly with aging, further suggesting premature aging of Grn-deficient brain. Indeed, Grn loss led to decreased neurogenesis and oligodendrogenesis, and to shortening of telomeres at young ages, to an extent comparable to that observed during aging. Altogether, our data demonstrate a role of Grn in regulating aging kinetics in the zebrafish telencephalon, thus providing a valuable tool for the development of new therapeutic approaches to treat age-associated pathologies.
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Affiliation(s)
- Alessandro Zambusi
- Institute of Stem Cell Research, Helmholtz Center Munich, 85764 Neuherberg, Germany
- Graduate School of Systemic Neuroscience; Biomedical Center, Faculty of Medicine, LMU Munich, 82152 Planegg, Germany
| | - Özge Pelin Burhan
- German Center for Neurodegenerative Diseases (DZNE), 81377 München, Germany; (Ö.P.B.); (B.S.)
| | - Rossella Di Giaimo
- Department of Biology, University of Naples Federico II, 80134 Naples, Italy;
| | - Bettina Schmid
- German Center for Neurodegenerative Diseases (DZNE), 81377 München, Germany; (Ö.P.B.); (B.S.)
| | - Jovica Ninkovic
- Institute of Stem Cell Research, Helmholtz Center Munich, 85764 Neuherberg, Germany
- Graduate School of Systemic Neuroscience; Biomedical Center, Faculty of Medicine, LMU Munich, 82152 Planegg, Germany
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112
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Petr MA, Tulika T, Carmona-Marin LM, Scheibye-Knudsen M. Protecting the Aging Genome. Trends Cell Biol 2020; 30:117-132. [DOI: 10.1016/j.tcb.2019.12.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/27/2019] [Accepted: 12/02/2019] [Indexed: 12/15/2022]
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113
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Lui PPY, Wong CM. Biology of Tendon Stem Cells and Tendon in Aging. Front Genet 2020; 10:1338. [PMID: 32010194 PMCID: PMC6976534 DOI: 10.3389/fgene.2019.01338] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 12/09/2019] [Indexed: 12/22/2022] Open
Abstract
Both tendon injuries and tendinopathies, particularly rotator cuff tears, increase with tendon aging. Tendon stem cells play important roles in promoting tendon growth, maintenance, and repair. Aged tendons show a decline in regenerative potential coupled with a loss of stem cell function. Recent studies draw attention to aging primarily a disorder of stem cells. The micro-environment (“niche”) where stem cells resided in vivo provides signals that direct them to metabolize, self-renew, differentiate, or remain quiescent. These signals include receptors and secreted soluble factors for cell-cell communication, extracellular matrix, oxidative stress, and vascularity. Both intrinsic cellular deficits and aged niche, coupled with age-associated systemic changes of hormonal and metabolic signals can inhibit or alter the functions of tendon stem cells, resulting in reduced fitness of these primitive cells and hence more frequent injuries and poor outcomes of tendon repair. This review aims to summarize the biological changes of aged tendons. The biological changes of tendon stem cells in aging are reviewed after a systematic search of the PubMed. Relevant factors of stem cell aging including cell-intrinsic factors, changes of microenvironment, and age-associated systemic changes of hormonal and metabolic signals are examined, with findings related to tendon stem cells highlighted when literature is available. Future research directions on the aging mechanisms of tendon stem cells are discussed. Better understanding of the molecular mechanisms underlying the functional decline of aged tendon stem cells would provide insight for the rational design of rejuvenating therapies.
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Affiliation(s)
| | - Chi Ming Wong
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, Hong Kong
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114
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He D, Wu H, Xiang J, Ruan X, Peng P, Ruan Y, Chen YG, Wang Y, Yu Q, Zhang H, Habib SL, De Pinho RA, Liu H, Li B. Gut stem cell aging is driven by mTORC1 via a p38 MAPK-p53 pathway. Nat Commun 2020; 11:37. [PMID: 31896747 PMCID: PMC6940394 DOI: 10.1038/s41467-019-13911-x] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 12/01/2019] [Indexed: 12/25/2022] Open
Abstract
Nutrients are absorbed solely by the intestinal villi. Aging of this organ causes malabsorption and associated illnesses, yet its aging mechanisms remain unclear. Here, we show that aging-caused intestinal villus structural and functional decline is regulated by mTORC1, a sensor of nutrients and growth factors, which is highly activated in intestinal stem and progenitor cells in geriatric mice. These aging phenotypes are recapitulated in intestinal stem cell-specific Tsc1 knockout mice. Mechanistically, mTORC1 activation increases protein synthesis of MKK6 and augments activation of the p38 MAPK-p53 pathway, leading to decreases in the number and activity of intestinal stem cells as well as villus size and density. Targeting p38 MAPK or p53 prevents or rescues ISC and villus aging and nutrient absorption defects. These findings reveal that mTORC1 drives aging by augmenting a prominent stress response pathway in gut stem cells and identify p38 MAPK as an anti-aging target downstream of mTORC1. Intestinal aging is associated with declines in structure and absorption of nutrients. Here, the authors show that aging related intestinal decline is mediated by activation of the mTORC1-p38MAPK-p53 pathway in intestinal stem cells and can be ameliorated by abrogating mTORC1 or p38MAPK activity.
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Affiliation(s)
- Dan He
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Hongguang Wu
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jinnan Xiang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xinsen Ruan
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Peike Peng
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China
| | - Yuanyuan Ruan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China
| | - Ye-Guang Chen
- State Key Laboratory of Membrane Biology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yibin Wang
- Department of Anesthesiology, Cardiovascular Research Laboratories, David Geffen School of Medicine, University of California, Los Angeles, CA, 90095, USA
| | - Qiang Yu
- A-STAR Genome Institute of Singapore, Singapore, 138648, Singapore
| | - Hongbing Zhang
- State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Samy L Habib
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX78229, USA
| | - Ronald A De Pinho
- Department of Cancer Biology, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Huijuan Liu
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Baojie Li
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China. .,Institute of Traditional Chinese Medicine and Stem Cell Research, School of Basic Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
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115
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Song S, Perez JV, Svitko W, Ricketts MD, Dean E, Schultz D, Marmorstein R, Johnson FB. Rap1-mediated nucleosome displacement can regulate gene expression in senescent cells without impacting the pace of senescence. Aging Cell 2020; 19:e13061. [PMID: 31742863 PMCID: PMC6974733 DOI: 10.1111/acel.13061] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 09/19/2019] [Accepted: 10/13/2019] [Indexed: 01/18/2023] Open
Abstract
Cell senescence is accompanied, and in part mediated, by changes in chromatin, including histone losses, but underlying mechanisms are not well understood. We reported previously that during yeast cell senescence driven by telomere shortening, the telomeric protein Rap1 plays a major role in reprogramming gene expression by relocalizing hundreds of new target genes (called NRTS, for new Rap1 targets at senescence) to the promoters. This leads to two types of histone loss: Rap1 lowers histone level globally by repressing histone gene expression, and it also causes local nucleosome displacement at the promoters of upregulated NRTS. Here, we present evidence of direct binding between Rap1 and histone H3/H4 heterotetramers, and map amino acids involved in the interaction within the Rap1 SANT domain to amino acids 392-394 (SHY). Introduction of a point mutation within the native RAP1 locus that converts these residues to alanines (RAP1SHY ), and thus disrupts Rap1-H3/H4 interaction, does not interfere with Rap1 relocalization to NRTS at senescence, but prevents full nucleosome displacement and gene upregulation, indicating direct Rap1-H3/H4 contacts are involved in nucleosome displacement. Consistent with this, the histone H3/H4 chaperone Asf1 is similarly unnecessary for Rap1 localization to NRTS but is required for full Rap1-mediated nucleosome displacement and gene activation. Remarkably, RAP1SHY does not affect the pace of senescence-related cell cycle arrest, indicating that some changes in gene expression at senescence are not coupled to this arrest.
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Affiliation(s)
- Shufei Song
- Department of Biochemistry and Molecular Biophysics University of Pennsylvania Philadelphia PA USA
- Graduate Group in Biochemistry and Molecular Biophysics University of Pennsylvania Philadelphia PA USA
- Department of Pathology and Laboratory Medicine University of Pennsylvania Philadelphia PA USA
| | - Javier V. Perez
- Department of Pathology and Laboratory Medicine University of Pennsylvania Philadelphia PA USA
| | - William Svitko
- Department of Pathology and Laboratory Medicine University of Pennsylvania Philadelphia PA USA
| | - M. Daniel Ricketts
- Department of Biochemistry and Molecular Biophysics University of Pennsylvania Philadelphia PA USA
- Abramson Family Cancer Research Institute University of Pennsylvania Philadelphia PA USA
| | - Elliot Dean
- High‐Throughput Screening Core University of Pennsylvania Philadelphia PA USA
| | - David Schultz
- High‐Throughput Screening Core University of Pennsylvania Philadelphia PA USA
| | - Ronen Marmorstein
- Department of Biochemistry and Molecular Biophysics University of Pennsylvania Philadelphia PA USA
- Abramson Family Cancer Research Institute University of Pennsylvania Philadelphia PA USA
| | - F. Brad Johnson
- Department of Biochemistry and Molecular Biophysics University of Pennsylvania Philadelphia PA USA
- Department of Pathology and Laboratory Medicine University of Pennsylvania Philadelphia PA USA
- Institute on Aging University of Pennsylvania Philadelphia PA USA
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116
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Zhang Y, Hyle J, Wright S, Shao Y, Zhao X, Zhang H, Li C. A cis-element within the ARF locus mediates repression of p16INK4A expression via long-range chromatin interactions. Proc Natl Acad Sci U S A 2019; 116:26644-26652. [PMID: 31818950 PMCID: PMC6936709 DOI: 10.1073/pnas.1909720116] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Loss of function of CDKN2A/B, also known as INK4/ARF [encoding p16INK4A, p15INK4B, and p14ARF (mouse p19Arf)], confers susceptibility to cancers, whereas its up-regulation during organismal aging provokes cellular senescence and tissue degenerative disorders. To better understand the transcriptional regulation of p16INK4A, a CRISPR screen targeting open, noncoding chromatin regions adjacent to p16INK4A was performed in a human p16INK4A-P2A-mCherry reporter cell line. We identified a repressive element located in the 3' region adjacent to the ARF promoter that controls p16INK4A expression via long-distance chromatin interactions. Coinfection of lentiviral dCas9-KRAB with selected single-guide RNAs against the repressive element abrogated the ARF/p16INK4A chromatin contacts, thus reactivating p16INK4A expression. Genetic CRISPR screening identified candidate transcription factors inhibiting p16INK4A regulation, including ZNF217, which was confirmed to bind the ARF/p16INK4A interaction loop. In summary, direct physical interactions between p16INK4A and ARF genes provide mechanistic insights into their cross-regulation.
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Affiliation(s)
- Yang Zhang
- Department of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105
| | - Judith Hyle
- Department of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105
| | - Shaela Wright
- Department of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105
| | - Ying Shao
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105
| | - Xujie Zhao
- Department of Pharmaceutical Sciences, St. Jude Children’s Research Hospital, Memphis, TN 38105
| | - Hui Zhang
- Department of Hematology and Oncology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, 510623 Guangdong, People’s Republic of China
| | - Chunliang Li
- Department of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105
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117
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Bacigaluppi M, Sferruzza G, Butti E, Ottoboni L, Martino G. Endogenous neural precursor cells in health and disease. Brain Res 2019; 1730:146619. [PMID: 31874148 DOI: 10.1016/j.brainres.2019.146619] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 11/25/2019] [Accepted: 12/19/2019] [Indexed: 12/15/2022]
Abstract
Neurogenesis persists in the adult brain of mammals in the subventricular zone (SVZ) of the lateral ventricles and in the subgranular zone (SGZ) of the dentate gyrus (DG). The complex interactions between intrinsic and extrinsic signals provided by cells in the niche but also from distant sources regulate the fate of neural stem/progenitor cells (NPCs) in these sites. This fine regulation is perturbed in aging and in pathological conditions leading to a different NPC behavior, tailored to the specific physio-pathological features. Indeed, NPCs exert in physiological and pathological conditions important neurogenic and non-neurogenic regulatory functions and participate in maintaining and protecting brain tissue homeostasis. In this review, we discuss intrinsic and extrinsic signals that regulate NPC activation and NPC functional role in various homeostatic and non-homeostatic conditions.
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Affiliation(s)
- Marco Bacigaluppi
- Neuroimmunology Unit and Department of Neurology, Institute of Experimental Neurology, San Raffaele Hospital and Università Vita- Salute San Raffaele, Via Olgettina 60, 20132 Milano, Italy.
| | - Giacomo Sferruzza
- Neuroimmunology Unit and Department of Neurology, Institute of Experimental Neurology, San Raffaele Hospital and Università Vita- Salute San Raffaele, Via Olgettina 60, 20132 Milano, Italy
| | - Erica Butti
- Neuroimmunology Unit and Department of Neurology, Institute of Experimental Neurology, San Raffaele Hospital and Università Vita- Salute San Raffaele, Via Olgettina 60, 20132 Milano, Italy
| | - Linda Ottoboni
- Neuroimmunology Unit and Department of Neurology, Institute of Experimental Neurology, San Raffaele Hospital and Università Vita- Salute San Raffaele, Via Olgettina 60, 20132 Milano, Italy
| | - Gianvito Martino
- Neuroimmunology Unit and Department of Neurology, Institute of Experimental Neurology, San Raffaele Hospital and Università Vita- Salute San Raffaele, Via Olgettina 60, 20132 Milano, Italy
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118
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New Insights for Cellular and Molecular Mechanisms of Aging and Aging-Related Diseases: Herbal Medicine as Potential Therapeutic Approach. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:4598167. [PMID: 31915506 PMCID: PMC6930799 DOI: 10.1155/2019/4598167] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 09/28/2019] [Accepted: 10/16/2019] [Indexed: 02/07/2023]
Abstract
Aging is a progressive disease affecting around 900 million people worldwide, and in recent years, the mechanism of aging and aging-related diseases has been well studied. Treatments for aging-related diseases have also made progress. For the long-term treatment of aging-related diseases, herbal medicine is particularly suitable for drug discovery. In this review, we discuss cellular and molecular mechanisms of aging and aging-related diseases, including oxidative stress, inflammatory response, autophagy and exosome interactions, mitochondrial injury, and telomerase damage, and summarize commonly used herbals and compounds concerned with the development of aging-related diseases, including Ginkgo biloba, ginseng, Panax notoginseng, Radix astragali, Lycium barbarum, Rhodiola rosea, Angelica sinensis, Ligusticum chuanxiong, resveratrol, curcumin, and flavonoids. We also summarize key randomized controlled trials of herbal medicine for aging-related diseases during the past ten years. Adverse reactions of herbs were also described. It is expected to provide new insights for slowing aging and treating aging-related diseases with herbal medicine.
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119
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Bast L, Calzolari F, Strasser MK, Hasenauer J, Theis FJ, Ninkovic J, Marr C. Increasing Neural Stem Cell Division Asymmetry and Quiescence Are Predicted to Contribute to the Age-Related Decline in Neurogenesis. Cell Rep 2019; 25:3231-3240.e8. [PMID: 30566852 DOI: 10.1016/j.celrep.2018.11.088] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 07/31/2018] [Accepted: 11/21/2018] [Indexed: 02/06/2023] Open
Abstract
Adult murine neural stem cells (NSCs) generate neurons in drastically declining numbers with age. How cellular dynamics sustain neurogenesis and how alterations with age may result in this decline are unresolved issues. We therefore clonally traced NSC lineages using confetti reporters in young and middle-aged adult mice. To understand the underlying mechanisms, we derived mathematical models that explain observed clonal cell type abundances. The best models consistently show self-renewal of transit-amplifying progenitors and rapid neuroblast cell cycle exit. In middle-aged mice, we identified an increased probability of asymmetric stem cell divisions at the expense of symmetric differentiation, accompanied by an extended persistence of quiescence between activation phases. Our model explains existing longitudinal population data and identifies particular cellular properties underlying adult NSC homeostasis and the aging of this stem cell compartment.
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Affiliation(s)
- Lisa Bast
- Institute of Computational Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Department of Mathematics, Chair of Mathematical Modeling of Biological Systems, Technische Universität München, Garching, Germany
| | - Filippo Calzolari
- Institute for Physiological Chemistry, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany; Institute of Stem Cell Research, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Department of Physiological Genomics, Ludwig-Maximilians University Munich, Munich, Germany.
| | - Michael K Strasser
- Institute of Computational Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Jan Hasenauer
- Institute of Computational Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Department of Mathematics, Chair of Mathematical Modeling of Biological Systems, Technische Universität München, Garching, Germany
| | - Fabian J Theis
- Institute of Computational Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Department of Mathematics, Chair of Mathematical Modeling of Biological Systems, Technische Universität München, Garching, Germany
| | - Jovica Ninkovic
- Institute of Stem Cell Research, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Department of Physiological Genomics, Ludwig-Maximilians University Munich, Munich, Germany; Department for Cell Biology and Anatomy, Biomedical Center of LMU, Ludwig-Maximilians University Munich, Munich, Germany.
| | - Carsten Marr
- Institute of Computational Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany.
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120
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ANRIL Variants Are Associated with Risk of Neuropsychiatric Conditions. J Mol Neurosci 2019; 70:212-218. [PMID: 31773399 DOI: 10.1007/s12031-019-01447-0] [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: 08/20/2019] [Accepted: 11/13/2019] [Indexed: 12/26/2022]
Abstract
The antisense non-coding RNA in the INK4 locus (ANRIL) is a long non-coding RNA (lncRNA) whose contribution in several human disorders has been verified. In the current projects, we genotyped two single nucleotide polymorphisms (SNPs) in this lncRNA (rs1333045 and rs1333048) in a population of Iranian patients with bipolar disorder (BP), major depressive disorder (MDD), and methamphetamine addiction. The rs1333045 was associated with methamphetamine addiction in recessive and multiplicative models (OR (95% CI) = 1.867 (1.211-2.877), adjusted p value = 8.75E-03 and OR (95% CI) = 1.415 (1.089-1.839), adjusted p value = 1.87E-02 respectively). The rs1333048 was associated with methamphetamine addiction in co-dominant model (A/A vs. C/C: OR (95% CI) = 0.195 (0.114-0.336), adjusted p value = 2.44E-09) and in other inheritance models. The rs1333045 was not associated with risk of BP I in any inheritance model. However, the rs1333048 was associated with BP I in co-dominant model (A/A vs. C/C: OR (95% CI) = 0.499 (0.286-0.870), adjusted p value = 2.53E-07) and in other inheritance models. In BP II cohort, we detected significant associations between both SNPs and risk of disorder in all inheritance models. In co-dominant model, these associations were detected just between homozygotes (T/T vs. C/C (rs1333045); A/A vs. C/C and (rs1333048)). The rs1333045 was associated with MDD in recessive model (OR (95% CI) = 2.221 (1.173-4.207), adjusted p value = 0.026). The rs1333048 was associated with MDDs in dominant, recessive, and multiplicative models. The selected SNPs were not in linkage disequilibrium (D' statistic = 0.23, r2 = 0.05). Haplotype analyses have shown that T A haplotype block (rs1333045 and rs1333048 respectively) significantly decreases risk of addiction, BP I, BP II, and MDD. Besides, the C C haplotype decreases risk of addiction, BP II and MDD. Finally, the T C haplotype increases risk of BP I, BP II, and MDD. Based on the above-mentioned data, the selected ANRIL SNPs or other SNPs in linkage disequilibrium with them might confer risk of neuropsychiatric disorders. Taken together, ANRIL can be regarded as a risk locus for these conditions.
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121
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Cutler RR, Kokovay E. Rejuvenating subventricular zone neurogenesis in the aging brain. Curr Opin Pharmacol 2019; 50:1-8. [PMID: 31756641 DOI: 10.1016/j.coph.2019.10.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 09/27/2019] [Accepted: 10/18/2019] [Indexed: 01/17/2023]
Abstract
Neural stem cells exist in specialized regions of the brain and have the capacity to give rise to neurons and glia over the lifespan. The process of giving rise to new neurons, also known as neurogenesis, is thought to be important in cognition and certain types of brain repair. However, during aging, neural stem cell number and function is reduced resulting in fewer new neurons and declines in learning, memory and repair. Recently, research has approached this problem through the lens of rejuvenation that now has produced several strategies, from dietary to pharmacological interventions, to restore functional neurogenesis that resembles the youthful brain. Here, we outline aging in the subventricular zone neurogenic niche, review the multiple modalities of rejuvenation strategies, and propose next steps for future studies to approach translational outcomes.
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Affiliation(s)
- Ronald R Cutler
- Department of Cell Systems and Anatomy, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, United States
| | - Erzsebet Kokovay
- Department of Cell Systems and Anatomy, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, United States; The Barshop Institute on Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, United States.
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122
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Li H, Chen Q, Li C, Zhong R, Zhao Y, Zhang Q, Tong W, Zhu D, Zhang Y. Muscle-secreted granulocyte colony-stimulating factor functions as metabolic niche factor ameliorating loss of muscle stem cells in aged mice. EMBO J 2019; 38:e102154. [PMID: 31736098 DOI: 10.15252/embj.2019102154] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 09/18/2019] [Accepted: 10/07/2019] [Indexed: 01/14/2023] Open
Abstract
The function and number of muscle stem cells (satellite cells, SCs) decline with muscle aging. Although SCs are heterogeneous and different subpopulations have been identified, it remains unknown whether a specific subpopulation of muscle SCs selectively decreases during aging. Here, we find that the number of SCs expressing high level of transcription factor Pax7 (Pax7Hi ) is dramatically reduced in aged mice. Myofiber-secreted granulocyte colony-stimulating factor (G-CSF) regulates age-dependent loss of Pax7Hi cells, as the Pax7Hi SCs are replenished by exercise-induced G-CSF in aged mice. Mechanistically, we show that transcription of G-CSF (Csf3) gene in myofibers is regulated by MyoD in a metabolism-dependent manner. Furthermore, myofiber-secreted G-CSF acts as a metabolic niche factor required for establishing and maintaining the Pax7Hi SC subpopulation in adult and physiological aged mice by promoting the asymmetric division of Pax7Hi and Pax7Mi SCs. Together, our findings uncover that muscles provide a metabolic niche regulating Pax7 SC heterogeneity in mice.
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Affiliation(s)
- Hu Li
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Qian Chen
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Changyin Li
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Ran Zhong
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Yixia Zhao
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Qianying Zhang
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Weimin Tong
- Department of Pathology, Institute of Basic Medical Sciences Chinese Academy of Medical Science, School of Basic Medicine, Peking Union Medical College, Beijing, China.,Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
| | - Dahai Zhu
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China.,Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Yong Zhang
- The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
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123
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Schmeer C, Kretz A, Wengerodt D, Stojiljkovic M, Witte OW. Dissecting Aging and Senescence-Current Concepts and Open Lessons. Cells 2019; 8:cells8111446. [PMID: 31731770 PMCID: PMC6912776 DOI: 10.3390/cells8111446] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 01/10/2023] Open
Abstract
In contrast to the programmed nature of development, it is still a matter of debate whether aging is an adaptive and regulated process, or merely a consequence arising from a stochastic accumulation of harmful events that culminate in a global state of reduced fitness, risk for disease acquisition, and death. Similarly unanswered are the questions of whether aging is reversible and can be turned into rejuvenation as well as how aging is distinguishable from and influenced by cellular senescence. With the discovery of beneficial aspects of cellular senescence and evidence of senescence being not limited to replicative cellular states, a redefinition of our comprehension of aging and senescence appears scientifically overdue. Here, we provide a factor-based comparison of current knowledge on aging and senescence, which we converge on four suggested concepts, thereby implementing the newly emerging cellular and molecular aspects of geroconversion and amitosenescence, and the signatures of a genetic state termed genosenium. We also address the possibility of an aging-associated secretory phenotype in analogy to the well-characterized senescence-associated secretory phenotype and delineate the impact of epigenetic regulation in aging and senescence. Future advances will elucidate the biological and molecular fingerprints intrinsic to either process.
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Affiliation(s)
- Christian Schmeer
- Hans-Berger Department of Neurology, Jena University Hospital, 07747 Jena, Thuringia, Germany; (A.K.); (D.W.); (M.S.); (O.W.W.)
- Jena Center for Healthy Ageing, Jena University Hospital, 07747 Jena, Thuringia, Germany
- Correspondence:
| | - Alexandra Kretz
- Hans-Berger Department of Neurology, Jena University Hospital, 07747 Jena, Thuringia, Germany; (A.K.); (D.W.); (M.S.); (O.W.W.)
- Jena Center for Healthy Ageing, Jena University Hospital, 07747 Jena, Thuringia, Germany
| | - Diane Wengerodt
- Hans-Berger Department of Neurology, Jena University Hospital, 07747 Jena, Thuringia, Germany; (A.K.); (D.W.); (M.S.); (O.W.W.)
| | - Milan Stojiljkovic
- Hans-Berger Department of Neurology, Jena University Hospital, 07747 Jena, Thuringia, Germany; (A.K.); (D.W.); (M.S.); (O.W.W.)
- Jena Center for Healthy Ageing, Jena University Hospital, 07747 Jena, Thuringia, Germany
| | - Otto W. Witte
- Hans-Berger Department of Neurology, Jena University Hospital, 07747 Jena, Thuringia, Germany; (A.K.); (D.W.); (M.S.); (O.W.W.)
- Jena Center for Healthy Ageing, Jena University Hospital, 07747 Jena, Thuringia, Germany
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124
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Pibiri M. Liver regeneration in aged mice: new insights. Aging (Albany NY) 2019; 10:1801-1824. [PMID: 30157472 PMCID: PMC6128415 DOI: 10.18632/aging.101524] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 08/10/2018] [Indexed: 02/06/2023]
Abstract
The regenerative capacity of the liver after resection is reduced with aging. Recent studies on rodents revealed that both intracellular and extracellular factors are involved in the impairment of liver mass recovery during aging. Among the intracellular factors, age-dependent decrease of BubR1 (budding uninhibited by benzimidazole-related 1), YAP (Yes-associated protein) and SIRT1 (Sirtuin-1) have been associated to dampening of tissue reconstitution and inhibition of cell cycle genes following partial hepatectomy. Extra-cellular factors, such as age-dependent changes in hepatic stellate cells affect liver regeneration through inhibition of progenitor cells and reduction of liver perfusion. Furthermore, chronic release of pro-inflammatory proteins by senescent cells (SASP) affects cell proliferation suggesting that senescent cell clearance might improve tissue regeneration. Accordingly, young plasma restores liver regeneration in aged animals through autophagy re-establishment. This review will discuss how intracellular and extracellular factors cooperate to guarantee a proper liver regeneration and the possible causes of its impairment during aging. The possibility that an improvement of the liver regenerative capacity in elderly might be achieved through elimination of senescent cells via autophagy or by administration of direct mitogenic agents devoid of cytotoxicity will also be entertained.
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Affiliation(s)
- Monica Pibiri
- Department of Biomedical Sciences, Oncology and Molecular Pathology Unit, University of Cagliari, Cagliari 09124, Italy
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125
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Folgueras AR, Freitas-Rodríguez S, Velasco G, López-Otín C. Mouse Models to Disentangle the Hallmarks of Human Aging. Circ Res 2019; 123:905-924. [PMID: 30355076 DOI: 10.1161/circresaha.118.312204] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Model organisms have provided fundamental evidence that aging can be delayed and longevity extended. These findings gave rise to a new era in aging research aimed at elucidating the pathways and networks controlling this complex biological process. The identification of 9 hallmarks of aging has established a framework to evaluate the relative contribution of each hallmark and the interconnections among them. In this review, we revisit these hallmarks with the information obtained exclusively through the generation of genetically modified mouse models that have a significant impact on the aging process. We discuss within each hallmark those interventions that accelerate aging or that have been successful at increasing lifespan, with the final goal of identifying the most promising antiaging avenues based on the current knowledge provided by in vivo models.
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Affiliation(s)
- Alicia R Folgueras
- From the Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, Spain
| | - Sandra Freitas-Rodríguez
- From the Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, Spain
| | - Gloria Velasco
- From the Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, Spain
| | - Carlos López-Otín
- From the Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, Spain
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126
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Abstract
Gliomas are heterogeneous tumours derived from glial cells and remain the deadliest form of brain cancer. Although the glioma stem cell sits at the apex of the cellular hierarchy, how it produces the vast cellular constituency associated with frank glioma remains poorly defined. We explore glioma tumorigenesis through the lens of glial development, starting with the neurogenic-gliogenic switch and progressing through oligodendrocyte and astrocyte differentiation. Beginning with the factors that influence normal glial linage progression and diversity, a pattern emerges that has useful parallels in the development of glioma and may ultimately provide targetable pathways for much-needed new therapeutics.
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127
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Yousefzadeh MJ, Melos KI, Angelini L, Burd CE, Robbins PD, Niedernhofer LJ. Mouse Models of Accelerated Cellular Senescence. Methods Mol Biol 2019; 1896:203-230. [PMID: 30474850 DOI: 10.1007/978-1-4939-8931-7_17] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Senescent cells accumulate in multiple tissues as virtually all vertebrate organisms age. Senescence is a highly conserved response to many forms of cellular stress intended to block the propagation of damaged cells. Senescent cells have been demonstrated to play a causal role in aging via their senescence-associated secretory phenotype and by impeding tissue regeneration. Depletion of senescent cells either through genetic or pharmacologic methods has been demonstrated to extend murine lifespan and delay the onset of age-related diseases. Measuring the burden and location of senescent cells in vivo remains challenging, as there is no marker unique to senescent cells. Here, we describe multiple methods to detect the presence and extent of cellular senescence in preclinical models, with a special emphasis on murine models of accelerated aging that exhibit a more rapid onset of cellular senescence.
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Affiliation(s)
- Matthew J Yousefzadeh
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, MN, USA
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, USA
- Department of Molecular Medicine, The Scripps Research Institute, Jupiter, FL, USA
| | - Kendra I Melos
- Department of Molecular Medicine, The Scripps Research Institute, Jupiter, FL, USA
| | - Luise Angelini
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, MN, USA
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, USA
- Department of Molecular Medicine, The Scripps Research Institute, Jupiter, FL, USA
| | - Christin E Burd
- Department of Molecular Genetics, The Ohio State University, Columbus, OH, USA
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, OH, USA
| | - Paul D Robbins
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, MN, USA
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, USA
- Department of Molecular Medicine, The Scripps Research Institute, Jupiter, FL, USA
| | - Laura J Niedernhofer
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, MN, USA.
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128
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Mehdipour M, Etienne J, Chen CC, Gathwala R, Rehman M, Kato C, Liu C, Liu Y, Zuo Y, Conboy MJ, Conboy IM. Rejuvenation of brain, liver and muscle by simultaneous pharmacological modulation of two signaling determinants, that change in opposite directions with age. Aging (Albany NY) 2019; 11:5628-5645. [PMID: 31422380 PMCID: PMC6710051 DOI: 10.18632/aging.102148] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 07/31/2019] [Indexed: 12/11/2022]
Abstract
We hypothesize that altered intensities of a few morphogenic pathways account for most/all the phenotypes of aging. Investigating this has revealed a novel approach to rejuvenate multiple mammalian tissues by defined pharmacology. Specifically, we pursued the simultaneous youthful in vivo calibration of two determinants: TGF-beta which activates ALK5/pSmad 2,3 and goes up with age, and oxytocin (OT) which activates MAPK and diminishes with age. The dose of Alk5 inhibitor (Alk5i) was reduced by 10-fold and the duration of treatment was shortened (to minimize overt skewing of cell-signaling pathways), yet the positive outcomes were broadened, as compared with our previous studies. Alk5i plus OT quickly and robustly enhanced neurogenesis, reduced neuro-inflammation, improved cognitive performance, and rejuvenated livers and muscle in old mice. Interestingly, the combination also diminished the numbers of cells that express the CDK inhibitor and marker of senescence p16 in vivo. Summarily, simultaneously re-normalizing two pathways that change with age in opposite ways (up vs. down) synergistically reverses multiple symptoms of aging.
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Affiliation(s)
- Melod Mehdipour
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Jessy Etienne
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Chia-Chien Chen
- Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Ranveer Gathwala
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Maryam Rehman
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Cameron Kato
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Chao Liu
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Yutong Liu
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Yi Zuo
- Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Michael J Conboy
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Irina M Conboy
- Department of Bioengineering and QB3 Institute, University of California, Berkeley, Berkeley, CA 94720, USA
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129
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Wang MJ, Chen J, Chen F, Liu Q, Sun Y, Yan C, Yang T, Bao Y, Hu YP. Rejuvenating Strategies of Tissue-specific Stem Cells for Healthy Aging. Aging Dis 2019; 10:871-882. [PMID: 31440391 PMCID: PMC6675530 DOI: 10.14336/ad.2018.1119] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 11/19/2018] [Indexed: 12/22/2022] Open
Abstract
Although aging is a physiological process, it has raised interest in the science of aging and rejuvenation because of the increasing burden on the rapidly aging global population. With advanced age, there is a decline in homeostatic maintenance and regenerative responsiveness to the injury of various tissues, thereby contributing to the incidence of age-related diseases. The primary cause of the functional declines that occur along with aging is considered to be the exhaustion of stem cell functions in their corresponding tissues. Age-related changes in the systemic environment, the niche, and stem cells contribute to this loss. Thus, the reversal of stem cell aging at the cellular level might lead to the rejuvenation of the animal at an organismic level and the prevention of aging, which would be critical for developing new therapies for age-related dysfunction and diseases. Here, we will explore the effects of aging on stem cells in different tissues. The focus of this discussion is on pro-youth interventions that target intrinsic stem cell properties, environmental niche component, systemic factors, and senescent cellular clearance, which are promising for developing strategies related to the reversal of aged stem cell function and optimizing tissue repair processes.
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Affiliation(s)
- Min-Jun Wang
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Jiajia Chen
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Fei Chen
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Qinggui Liu
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Yu Sun
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Chen Yan
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Tao Yang
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
| | - Yiwen Bao
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China.,2Department of Diagnostic radiology, University of Hong Kong, Hong Kong 999077, China
| | - Yi-Ping Hu
- 1Department of Cell Biology, Center for Stem Cell and Medicine, Second Military Medical University, Shanghai 200433, China
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130
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Kim KH, Cho Y, Lee J, Jeong H, Lee Y, Kim SI, Kim CH, Lee HW, Nam KT. Sexually dimorphic leanness and hypermobility in p16 Ink4a/CDKN2A-deficient mice coincides with phenotypic changes in the cerebellum. Sci Rep 2019; 9:11167. [PMID: 31371816 PMCID: PMC6671985 DOI: 10.1038/s41598-019-47676-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 07/22/2019] [Indexed: 12/31/2022] Open
Abstract
p16Ink4a/CDKN2A is a tumor suppressor that critically regulates the cell cycle. Indeed, p16Ink4a deficiency promotes tumor formation in various tissues. We now report that p16Ink4a deficiency in female mice, but not male mice, induces leanness especially in old age, as indicated by lower body weight and smaller white adipose tissue, although other major organs are unaffected. Unexpectedly, the integrity, number, and sizes of adipocytes in white adipose tissue were unaffected, as was macrophage infiltration. Hence, hypermobility appeared to be accountable for the phenotype, since food consumption was not altered. Histological analysis of the cerebellum and deep cerebellar nuclei, a vital sensorimotor control center, revealed increased proliferation of neuronal cells and improved cerebellum integrity. Expression of estrogen receptor β (ERβ) and PCNA also increased in deep cerebellar nuclei, implying crosstalk between p16Ink4a and ERβ. Furthermore, p16Ink4a deficiency expands LC3B+ cells and GFAP+ astrocytes in response to estrogen. Collectively, the data suggest that loss of p16INK4a induces sexually dimorphic leanness in female mice, which appears to be due to protection against cerebellar senescence by promoting neuronal proliferation and homeostasis via ERβ.
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Affiliation(s)
- Kwang H Kim
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Yejin Cho
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jaehoon Lee
- Department of Biochemistry, College of Life Science and Biotechnology and Yonsei Laboratory Animal Research Center, Yonsei University, Seoul, 03722, Republic of Korea
| | - Haengdueng Jeong
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Yura Lee
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Soo In Kim
- Department of Otorhinolaryngology, Korea Mouse Sensory Phenotyping Center, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Chang-Hoon Kim
- Department of Otorhinolaryngology, Korea Mouse Sensory Phenotyping Center, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Han-Woong Lee
- Department of Biochemistry, College of Life Science and Biotechnology and Yonsei Laboratory Animal Research Center, Yonsei University, Seoul, 03722, Republic of Korea
| | - Ki Taek Nam
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.
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131
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Pentinmikko N, Iqbal S, Mana M, Andersson S, Cognetta AB, Suciu RM, Roper J, Luopajärvi K, Markelin E, Gopalakrishnan S, Smolander OP, Naranjo S, Saarinen T, Juuti A, Pietiläinen K, Auvinen P, Ristimäki A, Gupta N, Tammela T, Jacks T, Sabatini DM, Cravatt BF, Yilmaz ÖH, Katajisto P. Notum produced by Paneth cells attenuates regeneration of aged intestinal epithelium. Nature 2019; 571:398-402. [PMID: 31292548 DOI: 10.1038/s41586-019-1383-0] [Citation(s) in RCA: 140] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/10/2019] [Indexed: 12/12/2022]
Abstract
A decline in stem cell function impairs tissue regeneration during ageing, but the role of the stem-cell-supporting niche in ageing is not well understood. The small intestine is maintained by actively cycling intestinal stem cells that are regulated by the Paneth cell niche1,2. Here we show that the regenerative potential of human and mouse intestinal epithelium diminishes with age owing to defects in both stem cells and their niche. The functional decline was caused by a decrease in stemness-maintaining Wnt signalling due to production of Notum, an extracellular Wnt inhibitor, in aged Paneth cells. Mechanistically, high activity of mammalian target of rapamycin complex 1 (mTORC1) in aged Paneth cells inhibits activity of peroxisome proliferator activated receptor α (PPAR-α)3, and lowered PPAR-α activity increased Notum expression. Genetic targeting of Notum or Wnt supplementation restored function of aged intestinal organoids. Moreover, pharmacological inhibition of Notum in mice enhanced the regenerative capacity of aged stem cells and promoted recovery from chemotherapy-induced damage. Our results reveal a role of the stem cell niche in ageing and demonstrate that targeting of Notum can promote regeneration of aged tissues.
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Affiliation(s)
- Nalle Pentinmikko
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Sharif Iqbal
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Miyeko Mana
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, MA, USA
| | - Simon Andersson
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Armand B Cognetta
- The Skaggs Institute for Chemical Biology, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA, USA
| | - Radu M Suciu
- The Skaggs Institute for Chemical Biology, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA, USA
| | - Jatin Roper
- Department of Medicine, Division of Gastroenterology, Duke University, Durham, NC, USA
| | - Kalle Luopajärvi
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Eino Markelin
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | | | | | - Santiago Naranjo
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, MA, USA
| | - Tuure Saarinen
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki, Finland.,Abdominal Center, Department of Gastrointestinal Surgery, Helsinki University Hospital, Helsinki, Finland
| | - Anne Juuti
- Abdominal Center, Department of Gastrointestinal Surgery, Helsinki University Hospital, Helsinki, Finland
| | - Kirsi Pietiläinen
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki, Finland
| | - Petri Auvinen
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Ari Ristimäki
- Department of Pathology, Research Programs Unit and HUSLAB, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Nitin Gupta
- Atlanta Gastroenterology Associates, Atlanta, GA, USA
| | - Tuomas Tammela
- Cancer Biology and Genetics, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Tyler Jacks
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, MA, USA.,Howard Hughes Medical Institute, MIT, Cambridge, MA, USA
| | - David M Sabatini
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, MA, USA.,Howard Hughes Medical Institute, MIT, Cambridge, MA, USA.,Whitehead Institute for Biomedical Research, Howard Hughes Medical Institute, Department of Biology, MIT, Cambridge, MA, USA
| | - Benjamin F Cravatt
- The Skaggs Institute for Chemical Biology, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA, USA
| | - Ömer H Yilmaz
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, MA, USA
| | - Pekka Katajisto
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki, Finland. .,Molecular and Integrative Bioscience Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland. .,Department of Biosciences and Nutrition, Karolinska Institutet, Stockholm, Sweden.
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132
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Single-cell analysis reveals T cell infiltration in old neurogenic niches. Nature 2019; 571:205-210. [PMID: 31270459 PMCID: PMC7111535 DOI: 10.1038/s41586-019-1362-5] [Citation(s) in RCA: 317] [Impact Index Per Article: 63.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 06/04/2019] [Indexed: 02/06/2023]
Abstract
The mammalian brain contains neurogenic niches comprising neural stem cells (NSCs) and other cell types. Neurogenic niches become less functional with age, but how they change during aging remains unclear. Here we perform single cell RNA-sequencing of young and old neurogenic niches in mice. Analysis of 14,685 single cell transcriptomes reveals a decrease in activated NSCs, changes in endothelial cells and microglia, and infiltration of T cells in old neurogenic niches. Surprisingly, T cells in old brains are clonally expanded and generally distinct from those in old blood, suggesting they may experience specific antigens. T cells from old brains express interferon γ, and the subset of NSCs with a high interferon response shows decreased proliferation in vivo. Interestingly, T cells can inhibit NSC proliferation in co-cultures and in vivo, in part by secreting interferon. Our study reveals an interaction between T cells and NSCs in old brains, opening potential avenues to counter age-related decline in brain function.
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133
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Álvarez-Satta M, Moreno-Cugnon L, Matheu A. Primary cilium and brain aging: role in neural stem cells, neurodegenerative diseases and glioblastoma. Ageing Res Rev 2019; 52:53-63. [PMID: 31004829 DOI: 10.1016/j.arr.2019.04.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 03/14/2019] [Accepted: 04/15/2019] [Indexed: 01/28/2023]
Abstract
Brain aging is characterized by a progressive loss of tissue integrity and function as a consequence of impaired homeostasis and regeneration capacities. The primary cilium is a highly conserved organelle that projects from the cell surface in a single copy in virtually all mammalian cell types including neural stem/progenitors cells and neurons. Increasing evidence in the last decade points out that primary cilium could be a relevant mediator of neural stem cell activity, neurogenesis, neuronal maturation and maintenance, and brain tumorigenesis. In this review, we summarize the current knowledge about primary cilia roles in these processes. There is currently sufficient background to propose that defective primary cilia contribute to age-related cognitive decline and brain tumor development due to their critical roles in cell cycle control and signaling transduction. This might have potential applications on therapy against age-associated brain diseases.
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134
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Morante-Redolat JM, Porlan E. Neural Stem Cell Regulation by Adhesion Molecules Within the Subependymal Niche. Front Cell Dev Biol 2019; 7:102. [PMID: 31245371 PMCID: PMC6581678 DOI: 10.3389/fcell.2019.00102] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 05/27/2019] [Indexed: 12/14/2022] Open
Abstract
In the mammalian adult brain, neural stem cells persist in neurogenic niches. The subependymal zone is the most prolific neurogenic niche in adult rodents, where residing stem cells generate large numbers of immature neurons that migrate into the olfactory bulb, where they differentiate into different types of interneurons. Subependymal neural stem cells derive from embryonic radial glia and retain some of their features like apico-basal polarity, with apical processes piercing the ependymal layer, and a basal process contacting blood vessels, constituting an epithelial niche. Conservation of the cytoarchitecture of the niche is of crucial importance for the maintenance of stem cells and for their neurogenic potential. In this minireview we will focus on extracellular matrix and adhesion molecules in the adult subependymal zone, showing their involvement not only as structural elements sustaining the niche architecture and topology, but also in the maintenance of stemness and regulation of the quiescence-proliferation balance.
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Affiliation(s)
- Jose Manuel Morante-Redolat
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universitat de València, Burjassot, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III (ISCIII), Madrid, Spain.,Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Burjassot, Spain
| | - Eva Porlan
- Departamento de Neuropatología Molecular, Centro de Biología Molecular Severo Ochoa Consejo Superior de Investigaciones Científicas - Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain.,Departamento de Biología Molecular, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain.,Hospital La Paz Institute for Health Research (IdiPAZ), Instituto de Salud Carlos III (ISCIII), Madrid, Spain
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135
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Chromosomal instability and pro-inflammatory response in aging. Mech Ageing Dev 2019; 182:111118. [PMID: 31102604 DOI: 10.1016/j.mad.2019.111118] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 04/25/2019] [Accepted: 05/14/2019] [Indexed: 01/10/2023]
Abstract
Aging refers to the progressive deterioration of tissue and organ function over time. Increasing evidence points to the accumulation of highly damaged cell cycle-arrested cells with age (cellular senescence) as major reason for the development of certain aging-associated diseases. Recent studies have independently shown that aneuploidy, an abnormal chromosome set, occurs in senescent cells, and that the accumulation of cytoplasmic DNA driven by faulty chromosome segregation during mitosis aids in the establishment of senescence and its associated secretory phenotype known as SASP. Here we review the emerging link between chromosomal instability (CIN) and senescence in the context of aging, with emphasis on the cGAS-STING pathway activation and its role in the development of the SASP. Based on current evidence, we propose that age-associated CIN in mitotically active cells contributes to aging and its associated diseases, and we discuss the inhibition of CIN as a potential strategy to prevent the generation of aneuploid senescent cells and thereby to delay aging.
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136
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Abstract
Senescent cells accumulate with age but tissue-based studies of senescent cells are limited to selected organs from humans, mice, and primates. Cell culture and xenograft studies have indicated that senescent cells in the microenvironment may play a role in tumor proliferation via paracrine activities. Dogs develop age-related conditions, including in the testis, but cellular senescence has not been confirmed. We hypothesized that senescent cells accumulate with age in canine testes and in the microenvironment of testicular tumors. We tested the expression of the established senescence markers γH2AX and p21 on normal formalin-fixed, paraffin-embedded testes from 15 young dogs (<18 months of age) and 15 old dogs (7-15 years of age) and correlated the findings with age-dependent morphological changes. A statistically significant age-dependent increase in the percentage of p21-expressing cells was observed for testicular fibroblasts (4-fold) and Leydig cells (8-fold). However, p21-expressing cells were still a rare event. In contrast, the percentage of γH2AX-positive cells did not increase with age. P21- and γH2AX-expressing cells were rare in the microenvironments of tumors. Age-dependent morphological changes included an increased mean number of Leydig cells per intertubular triangle (2.95-fold) and a decreased spermatogenesis score. To our surprise, no age-related changes were recorded for interstitial collagen content, mean tubular diameter, and epithelial area. Opposed to our expectations based on previous in vitro data, we did not identify evidence of a correlation between age-associated accumulation of senescent cells and testicular tumor development. Understanding the role of the microenvironment in senescence obviously remains a challenging task.
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Affiliation(s)
- Sophie E Merz
- 1 Institute of Veterinary Pathology, Freie Universität, Berlin, Germany
| | | | - Angele Breithaupt
- 1 Institute of Veterinary Pathology, Freie Universität, Berlin, Germany
| | - Achim D Gruber
- 1 Institute of Veterinary Pathology, Freie Universität, Berlin, Germany
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137
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Ritzel RM, Doran SJ, Glaser EP, Meadows VE, Faden AI, Stoica BA, Loane DJ. Old age increases microglial senescence, exacerbates secondary neuroinflammation, and worsens neurological outcomes after acute traumatic brain injury in mice. Neurobiol Aging 2019; 77:194-206. [PMID: 30904769 PMCID: PMC6486858 DOI: 10.1016/j.neurobiolaging.2019.02.010] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 01/31/2019] [Accepted: 02/09/2019] [Indexed: 01/10/2023]
Abstract
After traumatic brain injury (TBI), individuals aged over 65 years show increased mortality and worse functional outcomes compared with younger persons. As neuroinflammation is a key pathobiological mechanism of secondary injury after TBI, we examined how aging affects post-traumatic microglial responses and functional outcomes. Young (3-month-old) and aged (18-month-old) male C57Bl/6 mice were subjected to moderate-level controlled cortical impact or sham surgery, and neurological function was evaluated. At 72 hours after injury, brain, blood, and spleen leukocyte counts were assessed ex vivo using flow cytometry. Aged mice demonstrated more severe deficits in forelimb grip strength, balance and motor coordination, spontaneous locomotor activity, and anxiety-like behavior. These animals also exhibited more robust microglial proliferation and significantly higher numbers of brain-infiltrating leukocytes. Microglia in aged mice showed impairments in phagocytic activity and higher production of interleukin-1β (IL-1β). Infiltrating myeloid cells in aged TBI mice also had deficits in phagocytosis but showed diminished proinflammatory cytokine production and greater reactive oxygen species production. Expression of several senescence markers (Bcl-2, p16ink4a, p21cip1a, lipofuscin, and H2AX [pS139]) was increased with age and/or TBI in both microglia and injured cortex. Although there was no difference in the number of circulating blood neutrophils as a function of age, young mice exhibited more pronounced TBI-induced splenomegaly and splenic myeloid cell expansion. Thus, worse post-traumatic behavioral outcomes in aged animals are associated with exaggerated microglial responses, increased leukocyte invasion, and upregulation of senescence markers.
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Affiliation(s)
- Rodney M Ritzel
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - Sarah J Doran
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - Ethan P Glaser
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - Victoria E Meadows
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - Alan I Faden
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - Bogdan A Stoica
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA
| | - David J Loane
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD, USA.
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138
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Lin H, Sohn J, Shen H, Langhans MT, Tuan RS. Bone marrow mesenchymal stem cells: Aging and tissue engineering applications to enhance bone healing. Biomaterials 2019; 203:96-110. [PMID: 29980291 PMCID: PMC6733253 DOI: 10.1016/j.biomaterials.2018.06.026] [Citation(s) in RCA: 213] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/18/2018] [Accepted: 06/19/2018] [Indexed: 12/11/2022]
Abstract
Bone has well documented natural healing capacity that normally is sufficient to repair fractures and other common injuries. However, the properties of bone change throughout life, and aging is accompanied by increased incidence of bone diseases and compromised fracture healing capacity, which necessitate effective therapies capable of enhancing bone regeneration. The therapeutic potential of adult mesenchymal stem cells (MSCs) for bone repair has been long proposed and examined. Actions of MSCs may include direct differentiation to become bone cells, attraction and recruitment of other cells, or creation of a regenerative environment via production of trophic growth factors. With systemic aging, MSCs also undergo functional decline, which has been well investigated in a number of recent studies. In this review, we first describe the changes in MSCs during aging and discuss how these alterations can affect bone regeneration. We next review current research findings on bone tissue engineering, which is considered a promising and viable therapeutic solution for structural and functional restoration of bone. In particular, the importance of MSCs and bioscaffolds is highlighted. Finally, potential approaches for the prevention of MSC aging and the rejuvenation of aged MSC are discussed.
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Affiliation(s)
- Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Jihee Sohn
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - He Shen
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Division of Nanobiomedicine, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, China
| | - Mark T Langhans
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Rocky S Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; The Chinese University of Hong Kong, Hong Kong SAR, China.
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139
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Urbach A, Witte OW. Divide or Commit - Revisiting the Role of Cell Cycle Regulators in Adult Hippocampal Neurogenesis. Front Cell Dev Biol 2019; 7:55. [PMID: 31069222 PMCID: PMC6491688 DOI: 10.3389/fcell.2019.00055] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 03/28/2019] [Indexed: 12/21/2022] Open
Abstract
The adult dentate gyrus continuously generates new neurons that endow the brain with increased plasticity, helping to cope with changing environmental and cognitive demands. The process leading to the birth of new neurons spans several precursor stages and is the result of a coordinated series of fate decisions, which are tightly controlled by extrinsic signals. Many of these signals act through modulation of cell cycle (CC) components, not only to drive proliferation, but also for linage commitment and differentiation. In this review, we provide a comprehensive overview on key CC components and regulators, with emphasis on G1 phase, and analyze their specific functions in precursor cells of the adult hippocampus. We explore their role for balancing quiescence versus self-renewal, which is essential to maintain a lifelong pool of neural stem cells while producing new neurons “on demand.” Finally, we discuss available evidence and controversies on the impact of CC/G1 length on proliferation versus differentiation decisions.
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Affiliation(s)
- Anja Urbach
- Hans Berger Department of Neurology, Jena University Hospital, Jena, Germany
| | - Otto W Witte
- Hans Berger Department of Neurology, Jena University Hospital, Jena, Germany
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140
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Zou J, Wang W, Kratz K, Xu X, Nie Y, Ma N, Lendlein A. Evaluation of human mesenchymal stem cell senescence, differentiation and secretion behavior cultured on polycarbonate cell culture inserts. Clin Hemorheol Microcirc 2019; 70:573-583. [PMID: 30372670 DOI: 10.3233/ch-189322] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Polycarbonate (PC) substrate is well suited for culturing human mesenchymal stem cells (MSCs) with high proliferation rate, low cell apoptosis rate and negligible cytotoxic effects. However, little is known about the influence of PC on MSC activity including senescence, differentiation and secretion. In this study, the PC cell culture insert was applied for human MSC culture and was compared with polystyrene (PS) and standard tissue culture plate (TCP). The results showed that MSCs were able to adhere on PC surface, exhibiting a spindle-shaped morphology. The size and distribution of focal adhesions of MSCs were similar on PC and TCP. The senescence level of MSCs on PC was comparable to that on TCP, but was significantly lower than that on PS. MSCs on PC were capable of self-renewal and differentiation into multiple cell lineages, including osteogenic and adipogenic lineages. MSCs cultured on PC secreted a higher level inflammatory cytokines and pro-angiogenic factors including FGF2 and VEGF. Conclusively, PC represents a promising cell culture material for human MSCs.
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141
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Shrestha KR, Yoo SY. Phage-Based Artificial Niche: The Recent Progress and Future Opportunities in Stem Cell Therapy. Stem Cells Int 2019; 2019:4038560. [PMID: 31073312 PMCID: PMC6470417 DOI: 10.1155/2019/4038560] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 02/02/2019] [Accepted: 03/10/2019] [Indexed: 12/11/2022] Open
Abstract
Self-renewal and differentiation of stem cells can be the best option for treating intractable diseases in regenerative medicine, and they occur when these cells reside in a special microenvironment, called the "stem cell niche." Thus, the niche is crucial for the effective performance of the stem cells in both in vivo and in vitro since the niche provides its functional cues by interacting with stem cells chemically, physically, or topologically. This review provides a perspective on the different types of artificial niches including engineered phage and how they could be used to recapitulate or manipulate stem cell niches. Phage-based artificial niche engineering as a promising therapeutic strategy for repair and regeneration of tissues is also discussed.
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Affiliation(s)
- Kshitiz Raj Shrestha
- BIO-IT Foundry Technology Institute, Pusan National University, Busan 46241, Republic of Korea
| | - So Young Yoo
- BIO-IT Foundry Technology Institute, Pusan National University, Busan 46241, Republic of Korea
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan 50612, Republic of Korea
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142
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Lupo G, Gioia R, Nisi PS, Biagioni S, Cacci E. Molecular Mechanisms of Neurogenic Aging in the Adult Mouse Subventricular Zone. J Exp Neurosci 2019; 13:1179069519829040. [PMID: 30814846 PMCID: PMC6381424 DOI: 10.1177/1179069519829040] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 01/10/2019] [Indexed: 12/31/2022] Open
Abstract
In the adult rodent brain, the continuous production of new neurons by neural stem/progenitor cells (NSPCs) residing in specialized neurogenic niches and their subsequent integration into pre-existing cerebral circuitries supports odour discrimination, spatial learning, and contextual memory capabilities. Aging is recognized as the most potent negative regulator of adult neurogenesis. The neurogenic process markedly declines in the aged brain, due to the reduction of the NSPC pool and the functional impairment of the remaining NSPCs. This decline has been linked to the progressive cognitive deficits of elderly individuals and it may also be involved in the onset/progression of neurological disorders. Since the human lifespan has been dramatically extended, the incidence of age-associated neuropsychiatric conditions in the human population has increased. This has prompted efforts to shed light on the mechanisms underpinning the age-related decline of adult neurogenesis, whose knowledge may foster therapeutic approaches to prevent or delay cognitive alterations in elderly patients. In this review, we summarize recent progress in elucidating the molecular causes of neurogenic aging in the most abundant NSPC niche of the adult mouse brain: the subventricular zone (SVZ). We discuss the age-associated changes occurring both in the intrinsic NSPC molecular networks and in the extrinsic signalling pathways acting in the complex environment of the SVZ niche, and how all these changes may steer young NSPCs towards an aged phenotype.
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Affiliation(s)
- Giuseppe Lupo
- Department of Chemistry, Sapienza University of Rome, Rome, Italy
| | - Roberta Gioia
- Department of Biology and Biotechnology "Charles Darwin", Sapienza University of Rome, Rome, Italy
| | - Paola Serena Nisi
- Department of Biology and Biotechnology "Charles Darwin", Sapienza University of Rome, Rome, Italy
| | - Stefano Biagioni
- Department of Biology and Biotechnology "Charles Darwin", Sapienza University of Rome, Rome, Italy
| | - Emanuele Cacci
- Department of Biology and Biotechnology "Charles Darwin", Sapienza University of Rome, Rome, Italy
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143
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Micheli L, D'Andrea G, Ceccarelli M, Ferri A, Scardigli R, Tirone F. p16Ink4a Prevents the Activation of Aged Quiescent Dentate Gyrus Stem Cells by Physical Exercise. Front Cell Neurosci 2019; 13:10. [PMID: 30792628 PMCID: PMC6374340 DOI: 10.3389/fncel.2019.00010] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 01/11/2019] [Indexed: 12/19/2022] Open
Abstract
In the neurogenic niches—the dentate gyrus of the hippocampus and the subventricular zone (SVZ) adjacent to lateral ventricles—stem cells continue to divide during adulthood, generating progenitor cells and new neurons, and to self-renew, thus maintaining the stem cell pool. During aging, the numbers of stem/progenitor cells in the neurogenic niches are reduced. The preservation of the neurogenic pool is committed to a number of antiproliferative genes, with the role of maintaining the quiescence of neural cells. The cyclin-dependent kinase inhibitor p16Ink4a, whose expression increases with age, controls the expansion of SVZ aging stem cells, since in mice its deficiency prevents the decline of neurogenesis in SVZ. No change of neurogenesis is however observed in the p16Ink4a-null dentate gyrus. Here, we hypothesized that p16Ink4a plays a role as a regulator of the self-renewal of the stem cell pool also in the dentate gyrus, and to test this possibility we stimulated the dentate gyrus neural cells of p16Ink4a-null aging mice with physical exercise, a powerful neurogenic activator. We observed that running highly induced the generation of new stem cells in the p16Ink4a-null dentate gyrus, forcing them to exit from quiescence. Stem cells, notably, are not induced to proliferate by running in wild-type (WT) mice. Moreover, p16Ink4a-null progenitor cells were increased by running significantly above the number observed in WT mice. The new stem and progenitor cells generated new neurons, and continued to actively proliferate in p16Ink4a-null mice longer than in the WT after cessation of exercise. Thus, p16Ink4a prevents aging dentate gyrus stem cells from being activated by exercise. Therefore, p16Ink4a may play a role in the maintenance of dentate gyrus stem cells after stimulus, by keeping a reserve of their self-renewal capacity during aging.
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Affiliation(s)
- Laura Micheli
- Institute of Cell Biology and Neurobiology, National Research Council, Foundation Santa Lucia, Rome, Italy
| | - Giorgio D'Andrea
- Institute of Cell Biology and Neurobiology, National Research Council, Foundation Santa Lucia, Rome, Italy.,Department of Ecological and Biological Sciences, University of Tuscia, Viterbo, Italy
| | - Manuela Ceccarelli
- Institute of Cell Biology and Neurobiology, National Research Council, Foundation Santa Lucia, Rome, Italy
| | - Alessandra Ferri
- Institute of Cell Biology and Neurobiology, National Research Council, Foundation Santa Lucia, Rome, Italy
| | - Raffaella Scardigli
- Institute of Translational Pharmacology (IFT), National Research Council, Rome, Italy
| | - Felice Tirone
- Institute of Cell Biology and Neurobiology, National Research Council, Foundation Santa Lucia, Rome, Italy
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144
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Takei Y. Age-dependent decline in neurogenesis of the hippocampus and extracellular nucleotides. Hum Cell 2019; 32:88-94. [PMID: 30730038 DOI: 10.1007/s13577-019-00241-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 01/30/2019] [Indexed: 01/01/2023]
Abstract
New neurons are continuously generated in the adult brain. This generation primarily occurs in the subventricular zone (SVZ) of the lateral ventricles and the subgranular zone (SGZ) of the hippocampal dentate gyrus. In the SGZ, neural stem cells (NSCs) give rise to glutamatergic granule cells that integrate into the hippocampal circuitry. Reduction of neurogenesis in the hippocampus impairs learning and memory, which suggests that this process is important for adult hippocampal function. Indeed, the neurogenesis is reduced in the progression of aging, which is thought to contribute to age-related cognitive impairment. Although the mechanism of age-dependent decline in neurogenesis remains largely obscure, astrocytes are thought to play a vital role in regulating NSC proliferation and differentiation. Both astrocytes and NSCs secrete nucleotides to the extracellular space and extracellular nucleotides bind to their receptors on the surface of target cells. In this review, the recent knowledge on adult neurogenesis in the hippocampus is summarized briefly, and possible role of extracellular nucleotides in the age-dependent changes of the adult neurogenesis is discussed.
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Affiliation(s)
- Yoshinori Takei
- Department of Nanobio Drug Discovery, Graduate School of Pharmaceutical Science, Kyoto University, 46-29, Shimo-adachi-cho, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
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145
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Antonioli E, Torres N, Ferretti M, Piccinato CDA, Sertie AL. Individual response to mTOR inhibition in delaying replicative senescence of mesenchymal stromal cells. PLoS One 2019; 14:e0204784. [PMID: 30703123 PMCID: PMC6354956 DOI: 10.1371/journal.pone.0204784] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/06/2019] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AIMS Delaying replicative senescence and extending lifespan of human mesenchymal stromal cells (MSCs) may enhance their potential for tissue engineering and cell based therapies. Accumulating evidence suggests that inhibitors of the mTOR signaling pathway, such as rapamycin, constitute promising pharmacological agents to retard senescence and extend stemness properties of various progenitor cell types. Here, we investigated whether the ability of rapamycin to postpone replicative senescence varies among bone marrow MSC samples (BM-MSCs) derived from different healthy donors, and explored the molecular mechanisms that drive rapamycin-mediated lifespan increment. METHODS BM-MSCs at early passages were serially passaged either in absence or continuous presence of rapamycin and the number of cell population doublings until growth arrest was measured. The inhibition of mTOR signaling was assessed by the phosphorylation status of the downstream target RPS6. The expression levels of several senescence and pluripotency markers at early and late/senescent passages were analyzed by RT-qPCR, flow cytometry and western blot. RESULTS We found that the lifespan extension in response to the continuous rapamycin treatment was highly variable among samples, but effective in most BM-MSCs. Despite all rapamycin-treated cells secreted significantly reduced levels of IL6, a major SASP cytokine, and expressed significantly higher levels of the pluripotency marker NANOG, the expression patterns of these markers were not correlated with the rapamycin-mediated increase in lifespan. Interestingly, rapamycin-mediated life-span extension was significantly associated only with repression of p16INK4A protein accumulation. CONCLUSIONS Taken together, our results suggest that some, but not all, BM-MSC samples would benefit from using rapamycin to postpone replicative arrest and reinforce a critical role of p16INK4A protein downregulation in this process.
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Affiliation(s)
- Eliane Antonioli
- Hospital Israelita Albert Einstein, São Paulo, São Paulo, Brazil
| | - Natália Torres
- Hospital Israelita Albert Einstein, São Paulo, São Paulo, Brazil
| | - Mario Ferretti
- Hospital Israelita Albert Einstein, São Paulo, São Paulo, Brazil
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146
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Plausible Links Between Metabolic Networks, Stem Cells, and Longevity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1201:355-388. [PMID: 31898793 DOI: 10.1007/978-3-030-31206-0_15] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Aging is an inevitable consequence of life, and all multicellular organisms undergo a decline in tissue and organ functions as they age. Several well-known risk factors, such as obesity, diabetes, and lack of physical activity that lead to the cardiovascular system, decline and impede the function of vital organs, ultimately limit overall life span. Over recent years, aging research has experienced an unparalleled growth, particularly with the discovery and recognition of genetic pathways and biochemical processes that control to some extent the rate of aging.In this chapter, we focus on several aspects of stem cell biology and aging, beginning with major cellular hallmarks of aging, endocrine regulation of aging and its impact on stem cell compartment, and mechanisms of increased longevity. We then discuss the role of epigenetic modifications associated with aging and provide an overview on a most recent search of antiaging modalities.
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147
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Skop NB, Singh S, Antikainen H, Saqcena C, Calderon F, Rothbard DE, Cho CH, Gandhi CD, Levison SW, Dobrowolski R. Subacute Transplantation of Native and Genetically Engineered Neural Progenitors Seeded on Microsphere Scaffolds Promote Repair and Functional Recovery After Traumatic Brain Injury. ASN Neuro 2019; 11:1759091419830186. [PMID: 30818968 PMCID: PMC6399762 DOI: 10.1177/1759091419830186] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 12/11/2018] [Accepted: 12/18/2018] [Indexed: 01/09/2023] Open
Abstract
There is intense interest and effort toward regenerating the brain after severe injury. Stem cell transplantation after insult to the central nervous system has been regarded as the most promising approach for repair; however, engrafting cells alone might not be sufficient for effective regeneration. In this study, we have compared neural progenitors (NPs) from the fetal ventricular zone (VZ), the postnatal subventricular zone, and an immortalized radial glia (RG) cell line engineered to conditionally secrete the trophic factor insulin-like growth factor 1 (IGF-1). Upon differentiation in vitro, the VZ cells were able to generate a greater number of neurons than subventricular zone cells. Furthermore, differentiated VZ cells generated pyramidal neurons . In vitro, doxycycline-driven secretion of IGF-1 strongly promoted neuronal differentiation of cells with hippocampal, interneuron and cortical specificity. Accordingly, VZ and engineered RG-IGF-1-hemagglutinin (HA) cells were selected for subsequent in vivo experiments. To increase cell survival, we delivered the NPs attached to a multifunctional chitosan-based scaffold. The microspheres containing adherent NPs were injected subacutely into the lesion cavity of adult rat brains that had sustained controlled cortical impact injury. At 2 weeks posttransplantation, the exogenously introduced cells showed a reduction in stem cell or progenitor markers and acquired mature neuronal and glial markers. In beam walking tests assessing sensorimotor recovery, transplanted RG cells secreting IGF-1 contributed significantly to functional improvement while native VZ or RG cells did not promote significant recovery. Altogether, these results support the therapeutic potential of chitosan-based multifunctional microsphere scaffolds seeded with genetically modified NPs expressing IGF-1 to promote repair and functional recovery after traumatic brain injuries.
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Affiliation(s)
- Nolan B. Skop
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Newark, NJ, USA
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, USA
| | - Sweta Singh
- Department of Biological Sciences, Rutgers University, Newark, NJ, USA
- Stem Cell and Gene Therapy Research Group, Institute of Nuclear Medicine and Allied Sciences, Delhi, India
| | - Henri Antikainen
- Department of Biological Sciences, Rutgers University, Newark, NJ, USA
| | - Chaitali Saqcena
- Department of Biological Sciences, Rutgers University, Newark, NJ, USA
| | - Frances Calderon
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Newark, NJ, USA
| | - Deborah E. Rothbard
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Newark, NJ, USA
| | - Cheul H. Cho
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, USA
| | - Chirag D. Gandhi
- Department of Neurosurgery, Westchester Medical Center at NY Medical College, Valhalla, NY, USA
| | - Steven W. Levison
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Newark, NJ, USA
| | - Radek Dobrowolski
- Department of Biological Sciences, Rutgers University, Newark, NJ, USA
- Department of Cell Systems and Anatomy, University of Texas Health San Antonio, TX, USA
- Glenn Biggs Institute for Alzheimer’s & Neurodegenerative Diseases, University of Texas Health Science Center at San Antonio, TX, USA
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148
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Ovadya Y, Landsberger T, Leins H, Vadai E, Gal H, Biran A, Yosef R, Sagiv A, Agrawal A, Shapira A, Windheim J, Tsoory M, Schirmbeck R, Amit I, Geiger H, Krizhanovsky V. Impaired immune surveillance accelerates accumulation of senescent cells and aging. Nat Commun 2018; 9:5435. [PMID: 30575733 PMCID: PMC6303397 DOI: 10.1038/s41467-018-07825-3] [Citation(s) in RCA: 304] [Impact Index Per Article: 50.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 11/26/2018] [Indexed: 02/06/2023] Open
Abstract
Cellular senescence is a stress response that imposes stable cell-cycle arrest in damaged cells, preventing their propagation in tissues. However, senescent cells accumulate in tissues in advanced age, where they might promote tissue degeneration and malignant transformation. The extent of immune-system involvement in regulating age-related accumulation of senescent cells, and its consequences, are unknown. Here we show that Prf1-/- mice with impaired cell cytotoxicity exhibit both higher senescent-cell tissue burden and chronic inflammation. They suffer from multiple age-related disorders and lower survival. Strikingly, pharmacological elimination of senescent-cells by ABT-737 partially alleviates accelerated aging phenotype in these mice. In LMNA+/G609G progeroid mice, impaired cell cytotoxicity further promotes senescent-cell accumulation and shortens lifespan. ABT-737 administration during the second half of life of these progeroid mice abrogates senescence signature and increases median survival. Our findings shed new light on mechanisms governing senescent-cell presence in aging, and could motivate new strategies for regenerative medicine.
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Affiliation(s)
- Yossi Ovadya
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Tomer Landsberger
- Department of Immunology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Hanna Leins
- Institute of Molecular Medicine, Stem Cell and Aging, Ulm University, Ulm, 89081, Germany.,Department of Internal Medicine I, University Hospital of Ulm, Ulm, 89081, Germany
| | - Ezra Vadai
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Hilah Gal
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Anat Biran
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Reut Yosef
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Adi Sagiv
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Amit Agrawal
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Alon Shapira
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Joseph Windheim
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Michael Tsoory
- Department of Veterinary Resources, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Reinhold Schirmbeck
- Department of Internal Medicine I, University Hospital of Ulm, Ulm, 89081, Germany
| | - Ido Amit
- Department of Immunology, The Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Hartmut Geiger
- Institute of Molecular Medicine, Stem Cell and Aging, Ulm University, Ulm, 89081, Germany.,Experimental Hematology and Cancer Biology Cincinnati Children's Hospital Medical Center, 45229, Cincinnati, OH, USA
| | - Valery Krizhanovsky
- Department of Molecular Cell Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel.
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149
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Adult Hippocampal Neurogenesis: A Coming-of-Age Story. J Neurosci 2018; 38:10401-10410. [PMID: 30381404 DOI: 10.1523/jneurosci.2144-18.2018] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/21/2018] [Accepted: 10/23/2018] [Indexed: 12/20/2022] Open
Abstract
What has become standard textbook knowledge over the last decade was a hotly debated matter a decade earlier: the proposition that new neurons are generated in the adult mammalian CNS. The early discovery by Altman and colleagues in the 1960s was vulnerable to criticism due to the lack of technical strategies for unequivocal demonstration, quantification, and physiological analysis of newly generated neurons in adult brain tissue. After several technological advancements had been made in the field, we published a paper in 1996 describing the generation of new neurons in the adult rat brain and the decline of hippocampal neurogenesis during aging. The paper coincided with the publication of several other studies that together established neurogenesis as a cellular mechanism in the adult mammalian brain. In this Progressions article, which is by no means a comprehensive review, we recount our personal view of the initial setting that led to our study and we discuss some of its implications and developments that followed. We also address questions that remain regarding the regulation and function of neurogenesis in the adult mammalian brain, in particular the existence of neurogenesis in the adult human brain.
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150
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Kulkarni S, Ganz J, Bayrer J, Becker L, Bogunovic M, Rao M. Advances in Enteric Neurobiology: The "Brain" in the Gut in Health and Disease. J Neurosci 2018; 38:9346-9354. [PMID: 30381426 PMCID: PMC6209840 DOI: 10.1523/jneurosci.1663-18.2018] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 09/20/2018] [Accepted: 09/22/2018] [Indexed: 12/14/2022] Open
Abstract
The enteric nervous system (ENS) is a large, complex division of the peripheral nervous system that regulates many digestive, immune, hormonal, and metabolic functions. Recent advances have elucidated the dynamic nature of the mature ENS, as well as the complex, bidirectional interactions among enteric neurons, glia, and the many other cell types that are important for mediating gut behaviors. Here, we provide an overview of ENS development and maintenance, and focus on the latest insights gained from the use of novel model systems and live-imaging techniques. We discuss major advances in the understanding of enteric glia, and the functional interactions among enteric neurons, glia, and enteroendocrine cells, a large class of sensory epithelial cells. We conclude by highlighting recent work on muscularis macrophages, a group of immune cells that closely interact with the ENS in the gut wall, and the importance of neurological-immune system communication in digestive health and disease.
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Affiliation(s)
- Subhash Kulkarni
- Department of Medicine, The John Hopkins University School of Medicine, Baltimore, Maryland 21205,
| | - Julia Ganz
- Department of Integrative Biology, Michigan State University, East Lansing, Michigan 48824
| | - James Bayrer
- Department of Pediatrics, University of California, San Francisco, San Francisco, California 94143
| | - Laren Becker
- Department of Medicine, Stanford University, Stanford, California 94305
| | - Milena Bogunovic
- Department of Microbiology and Immunology, Penn State College of Medicine, Hershey, Pennsylvania 17033, and
| | - Meenakshi Rao
- Division of Gastroenterology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115
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