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Sun R, Feng J, Wang J. Underlying Mechanisms and Treatment of Cellular Senescence-Induced Biological Barrier Interruption and Related Diseases. Aging Dis 2024; 15:612-639. [PMID: 37450933 PMCID: PMC10917536 DOI: 10.14336/ad.2023.0621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/21/2023] [Indexed: 07/18/2023] Open
Abstract
Given its increasing prevalence, aging is of great concern to researchers worldwide. Cellular senescence is a physiological or pathological cellular state caused by aging and a prominent risk factor for the interruption of the integrity and functionality of human biological barriers. Health barriers play an important role in maintaining microenvironmental homeostasis within the body. The senescence of barrier cells leads to barrier dysfunction and age-related diseases. Cellular senescence has been reported to be a key target for the prevention of age-related barrier diseases, including Alzheimer's disease, Parkinson's disease, age-related macular degeneration, diabetic retinopathy, and preeclampsia. Drugs such as metformin, dasatinib, quercetin, BCL-2 inhibitors, and rapamycin have been shown to intervene in cellular senescence and age-related diseases. In this review, we conclude that cellular senescence is involved in age-related biological barrier impairment. We further outline the cellular pathways and mechanisms underlying barrier impairment caused by cellular senescence and describe age-related barrier diseases associated with senescent cells. Finally, we summarize the currently used anti-senescence pharmacological interventions and discuss their therapeutic potential for preventing age-related barrier diseases.
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Affiliation(s)
- Ruize Sun
- Department of Neurology, Shengjing Hospital, Affiliated Hospital of China Medical University, Shenyang, China
| | - Juan Feng
- Department of Neurology, Shengjing Hospital, Affiliated Hospital of China Medical University, Shenyang, China
| | - Jue Wang
- Department of Neurology, Shengjing Hospital, Affiliated Hospital of China Medical University, Shenyang, China
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2
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Kibler A, Seifert M, Budeus B. Age-related changes of the human splenic marginal zone B cell compartment. Immunol Lett 2023; 256-257:59-65. [PMID: 37044264 DOI: 10.1016/j.imlet.2023.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/24/2023] [Accepted: 04/07/2023] [Indexed: 04/14/2023]
Abstract
In this review, we will summarize the growing body of knowledge on the age-related changes of human splenic B cell composition and molecular evidence of immune maturation and discuss the contribution of these changes on splenic protective function. From birth on, the splenic marginal zone (sMZ) contains a specialized B cell subpopulation, which recruits and archives memory B cells from immune responses throughout the organism. The quality of sMZ B cell responses is augmented by germinal center (GC)-dependent maturation of memory B cells during childhood, however, in old age, these mechanisms likely contribute to waning of splenic protective function.
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Affiliation(s)
- Artur Kibler
- Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen, Germany
| | - Marc Seifert
- Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen, Germany; Department of Hematology, Oncology and Clinical Immunology, Heinrich-Heine University, Düsseldorf, Germany.
| | - Bettina Budeus
- Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen, Germany
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3
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Jang H, Jo Y, Lee JH, Choi S. Aging of hair follicle stem cells and their niches. BMB Rep 2023; 56:2-9. [PMID: 36379515 PMCID: PMC9887102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Indexed: 01/28/2023] Open
Abstract
Hair follicles in the skin undergo cyclic rounds of regeneration, degeneration, and rest throughout life. Stem cells residing in hair follicles play a pivotal role in maintaining tissue homeostasis and hair growth cycles. Research on hair follicle aging and age-related hair loss has demonstrated that a decline in hair follicle stem cell (HFSC) activity with aging can decrease the regeneration capacity of hair follicles. This review summarizes our understanding of how age-associated HFSC intrinsic and extrinsic mechanisms can induce HFSC aging and hair loss. In addition, we discuss approaches developed to attenuate ageassociated changes in HFSCs and their niches, thereby promoting hair regrowth. [BMB Reports 2023; 56(1): 2-9].
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Affiliation(s)
- Hansaem Jang
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea
| | - Yemin Jo
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea
| | - Jung Hyun Lee
- Division of Dermatology, Department of Medicine, University of Washington, Seattle, WA 98109, Korea,Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, USA, Incheon 21983, Korea
| | - Sekyu Choi
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea,School of Medical Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea,School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea,Institute for Convergence Research and Education in Advanced Technology (I_CREATE), Yonsei University, Incheon 21983, Korea,Corresponding author. Tel: +82-54-279-2359; Fax: +82-54-279-2199; E-mail:
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4
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Jang H, Jo Y, Lee JH, Choi S. Aging of hair follicle stem cells and their niches. BMB Rep 2023; 56:2-9. [PMID: 36379515 PMCID: PMC9887102 DOI: 10.5483/bmbrep.2022-0183] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/14/2022] [Accepted: 11/14/2022] [Indexed: 09/06/2023] Open
Abstract
Hair follicles in the skin undergo cyclic rounds of regeneration, degeneration, and rest throughout life. Stem cells residing in hair follicles play a pivotal role in maintaining tissue homeostasis and hair growth cycles. Research on hair follicle aging and age-related hair loss has demonstrated that a decline in hair follicle stem cell (HFSC) activity with aging can decrease the regeneration capacity of hair follicles. This review summarizes our understanding of how age-associated HFSC intrinsic and extrinsic mechanisms can induce HFSC aging and hair loss. In addition, we discuss approaches developed to attenuate ageassociated changes in HFSCs and their niches, thereby promoting hair regrowth. [BMB Reports 2023; 56(1): 2-9].
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Affiliation(s)
- Hansaem Jang
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea
| | - Yemin Jo
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea
| | - Jung Hyun Lee
- Division of Dermatology, Department of Medicine, University of Washington, Seattle, WA 98109, Korea
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, USA, Incheon 21983, Korea
| | - Sekyu Choi
- Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea, Incheon 21983, Korea
- School of Medical Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
- School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
- Institute for Convergence Research and Education in Advanced Technology (I_CREATE), Yonsei University, Incheon 21983, Korea
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5
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Marrella V, Facoetti A, Cassani B. Cellular Senescence in Immunity against Infections. Int J Mol Sci 2022; 23:ijms231911845. [PMID: 36233146 PMCID: PMC9570409 DOI: 10.3390/ijms231911845] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/26/2022] [Accepted: 09/29/2022] [Indexed: 11/16/2022] Open
Abstract
Cellular senescence is characterized by irreversible cell cycle arrest in response to different triggers and an inflammatory secretome. Although originally described in fibroblasts and cell types of solid organs, cellular senescence affects most tissues with advancing age, including the lymphoid tissue, causing chronic inflammation and dysregulation of both innate and adaptive immune functions. Besides its normal occurrence, persistent microbial challenge or pathogenic microorganisms might also accelerate the activation of cellular aging, inducing the premature senescence of immune cells. Therapeutic strategies counteracting the detrimental effects of cellular senescence are being developed. Their application to target immune cells might have the potential to improve immune dysfunctions during aging and reduce the age-dependent susceptibility to infections. In this review, we discuss how immune senescence influences the host’s ability to resolve more common infections in the elderly and detail the different markers proposed to identify such senescent cells; the mechanisms by which infectious agents increase the extent of immune senescence are also reviewed. Finally, available senescence therapeutics are discussed in the context of their effects on immunity and against infections.
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Affiliation(s)
- Veronica Marrella
- UOS Milan Unit, Istituto di Ricerca Genetica e Biomedica (IRGB), CNR, 20138 Milan, Italy
- IRCCS Humanitas Research Hospital, 20089 Milan, Italy
| | - Amanda Facoetti
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy
| | - Barbara Cassani
- IRCCS Humanitas Research Hospital, 20089 Milan, Italy
- Department of Medical Biotechnologies and Translational Medicine, Università Degli Studi di Milano, 20089 Milan, Italy
- Correspondence:
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6
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Kulkarni R. Early Growth Response Factor 1 in Aging Hematopoietic Stem Cells and Leukemia. Front Cell Dev Biol 2022; 10:925761. [PMID: 35923847 PMCID: PMC9340249 DOI: 10.3389/fcell.2022.925761] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 06/14/2022] [Indexed: 11/13/2022] Open
Abstract
Aging is associated with various hematological disorders and a higher risk of myeloproliferative disorders. An aged hematopoietic system can be characterized by decreased immune function and increased myeloid cell production. Hematopoietic stem cells (HSCs) regulate the production of blood cells throughout life. The self-renewal and regenerative potential of HSCs determine the quality and quantity of the peripheral blood cells. External signals from the microenvironment under different conditions determine the fate of the HSCs to proliferate, self-renew, differentiate, or remain quiescent. HSCs respond impromptu to a vast array of extracellular signaling cascades such as cytokines, growth factors, or nutrients, which are crucial in the regulation of HSCs. Early growth response factor 1 (EGR1) is one of the key transcription factors controlling HSC proliferation and their localization in the bone marrow (BM) niche. Downregulation of Egr1 activates and recruits HSCs for their proliferation and differentiation to produce mature blood cells. Increased expression of Egr1 is implicated in immuno-aging of HSCs. However, dysregulation of Egr1 is associated with hematological malignancies such as acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), and chronic myelogenous leukemia (CML). Here, we summarize the current understanding of the role of EGR1 in the regulation of HSC functionality and the manifestation of leukemia. We also discuss the alternative strategies to rejuvenate the aged HSCs by targeting EGR1 in different settings.
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7
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Hematopoiesis, Inflammation and Aging-The Biological Background and Clinical Impact of Anemia and Increased C-Reactive Protein Levels on Elderly Individuals. J Clin Med 2022; 11:jcm11030706. [PMID: 35160156 PMCID: PMC8836692 DOI: 10.3390/jcm11030706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/21/2022] [Accepted: 01/24/2022] [Indexed: 01/27/2023] Open
Abstract
Anemia and systemic signs of inflammation are common in elderly individuals and are associated with decreased survival. The common biological context for these two states is then the hallmarks of aging, i.e., genomic instability, telomere shortening, epigenetic alterations, loss of proteostasis, deregulated nutrient sensing, mitochondrial dysfunction, cellular senescence, stem cell exhaustion and altered intercellular communication. Such aging-associated alterations of hematopoietic stem cells are probably caused by complex mechanisms and depend on both the aging of hematopoietic (stem) cells and on the supporting stromal cells. The function of inflammatory or immunocompetent cells is also altered by aging. The intracellular signaling initiated by soluble proinflammatory mediators (e.g., IL1, IL6 and TNFα) is altered during aging and contributes to the development of both the inhibition of erythropoiesis with anemia as well as to the development of the acute-phase reaction as a systemic sign of inflammation with increased CRP levels. Both anemia and increased CRP levels are associated with decreased overall survival and increased cardiovascular mortality. The handling of elderly patients with inflammation and/or anemia should in our opinion be individualized; all of them should have a limited evaluation with regard to the cause of the abnormalities, but the extent of additional and especially invasive diagnostic evaluation should be based on an overall clinical evaluation and the possible therapeutic consequences.
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Modeling of human T cell development in vitro as a read-out for hematopoietic stem cell multipotency. Biochem Soc Trans 2021; 49:2113-2122. [PMID: 34643218 PMCID: PMC8589437 DOI: 10.1042/bst20210144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 12/24/2022]
Abstract
Hematopoietic stem cells (HSCs) reside in distinct sites throughout fetal and adult life and give rise to all cells of the hematopoietic system. Because of their multipotency, HSCs are capable of curing a wide variety of blood disorders through hematopoietic stem cell transplantation (HSCT). However, due to HSC heterogeneity, site-specific ontogeny and current limitations in generating and expanding HSCs in vitro, their broad use in clinical practice remains challenging. To assess HSC multipotency, evaluation of their capacity to generate T lymphocytes has been regarded as a valid read-out. Several in vitro models of T cell development have been established which are able to induce T-lineage differentiation from different hematopoietic precursors, although with variable efficiency. Here, we review the potential of human HSCs from various sources to generate T-lineage cells using these different models in order to address the use of both HSCs and T cell precursors in the clinic.
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Luan J, Xu H, Jin Z, Guan H, Gao X, Gou X, Xu L. Analysis of the dynamic changes in the proportion of immune cells and the proportion of cells with stem cell characteristics in the corresponding immune cell population of C57 mice during the natural aging process. Immunol Res 2021; 69:520-532. [PMID: 34415527 DOI: 10.1007/s12026-021-09229-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Accepted: 08/14/2021] [Indexed: 01/17/2023]
Abstract
The aging of the immune system is not only an inevitable result but also an important cause of physical aging. The aging of the immune system is rooted in the aging of hematopoietic cells (HSCs), which manifests as decreasing functionality of the adaptive immune system and the innate immune system. C57BL/6 mice of different ages were collected in this study to better understand the changes in the structures of the innate and adaptive immune systems in individuals of different ages and the distribution and changes in immune cells with stem cell properties. The immune cells of the innate and adaptive immune systems, including DCs, monocytes, macrophages, CD4+ T lymphocytes, CD8+ T lymphocytes, and B lymphocytes, were assessed, and the proportions of cells with stem cell properties among these immune cell populations were also tested. Overall, immune cells in the peripheral blood, spleen, and bone marrow of mice exhibit certain regular properties with increasing age. The trend of changes in immune cells in different immune organs differs with age. The changes in lymphocytes in the peripheral blood are more sensitive. Their proportions increase slowly with age and then decrease rapidly to a very low level (less than 5%) after a certain point (9 or 13 months old). Nine to 13 months of age is the most critical time point for assessing changes in the immune system of mice and the most critical time point for detecting changes in the proportion of stem cells. After 13 months of age, the balance and stability of stem cells in mice are disrupted, and animals begin to age rapidly. The ratio of Ly6A to E+CD117+ cells in the peripheral blood, particularly lymphocytes involved in adaptive immunity, represents a specific marker for predicting immune senescence and body senescence.
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Affiliation(s)
- Jing Luan
- Department of Anesthesiology, School of Stomatology, Fourth Military Medical University, Xi'an, China.,Shaanxi Key Laboratory of Brain Disorders and Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, 710021, Shaanxi, China.,Shaanxi Key Laboratory of Ischemic Cardiovascular Disease, Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, China
| | - Hao Xu
- Institution of Basic Medical Science, Xi'an Medical University, Xi'an, China
| | - Zhang Jin
- Department of Anesthesiology, School of Stomatology, Fourth Military Medical University, Xi'an, China
| | - Hua Guan
- Shaanxi Key Laboratory of Ischemic Cardiovascular Disease, Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, China
| | - Xingchun Gao
- Institution of Basic Medical Science, Xi'an Medical University, Xi'an, China
| | - Xingchun Gou
- Shaanxi Key Laboratory of Brain Disorders and Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, 710021, Shaanxi, China.
| | - Lixian Xu
- Department of Anesthesiology, School of Stomatology, Fourth Military Medical University, Xi'an, China.
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10
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Grønningsæter IS, Reikvam H, Aasebø E, Bartaula-Brevik S, Hernandez-Valladares M, Selheim F, Berven FS, Tvedt TH, Bruserud Ø, Hatfield KJ. Effects of the Autophagy-Inhibiting Agent Chloroquine on Acute Myeloid Leukemia Cells; Characterization of Patient Heterogeneity. J Pers Med 2021; 11:jpm11080779. [PMID: 34442423 PMCID: PMC8399694 DOI: 10.3390/jpm11080779] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/06/2021] [Accepted: 08/07/2021] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a highly conserved cellular degradation process that prevents cell damage and promotes cell survival, and clinical efforts have exploited autophagy inhibition as a therapeutic strategy in cancer. Chloroquine is a well-known antimalarial agent that inhibits late-stage autophagy. We evaluated the effects of chloroquine on cell viability and proliferation of acute myeloid leukemia acute myeloid leukemia (AML) cells derived from 81 AML patients. Our results show that chloroquine decreased AML cell viability and proliferation for the majority of patients. Furthermore, a subgroup of AML patients showed a greater susceptibility to chloroquine, and using hierarchical cluster analysis, we identified 99 genes upregulated in this patient subgroup, including several genes related to leukemogenesis. The combination of chloroquine with low-dose cytarabine had an additive inhibitory effect on AML cell proliferation. Finally, a minority of patients showed increased extracellular constitutive mediator release in the presence of chloroquine, which was associated with strong antiproliferative effects of chloroquine as well as cytarabine. We conclude that chloroquine has antileukemic activity and should be further explored as a therapeutic drug against AML in combination with other cytotoxic or metabolic drugs; however, due to the patient heterogeneity, chloroquine therapy will probably be effective only for selected patients.
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Affiliation(s)
- Ida Sofie Grønningsæter
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
- Department of Medicine, Akershus University Hospital, N-1478 Lørenskog, Norway
| | - Håkon Reikvam
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
- Department of Medicine, Haukeland University Hospital, N-5021 Bergen, Norway;
| | - Elise Aasebø
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
- The Proteomics Facility of the University of Bergen (PROBE), Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway; (M.H.-V.); (F.S.); (F.S.B.)
| | - Sushma Bartaula-Brevik
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
| | - Maria Hernandez-Valladares
- The Proteomics Facility of the University of Bergen (PROBE), Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway; (M.H.-V.); (F.S.); (F.S.B.)
- The Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway
| | - Frode Selheim
- The Proteomics Facility of the University of Bergen (PROBE), Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway; (M.H.-V.); (F.S.); (F.S.B.)
- The Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway
| | - Frode S. Berven
- The Proteomics Facility of the University of Bergen (PROBE), Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway; (M.H.-V.); (F.S.); (F.S.B.)
- The Department of Biomedicine, University of Bergen, N-5009 Bergen, Norway
| | - Tor Henrik Tvedt
- Department of Medicine, Haukeland University Hospital, N-5021 Bergen, Norway;
- Department of Hematology, Oslo University Hospital—The National Hospital, N-0372 Oslo, Norway
| | - Øystein Bruserud
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
- Department of Medicine, Haukeland University Hospital, N-5021 Bergen, Norway;
- Correspondence: (Ø.B.); (K.J.H.)
| | - Kimberley Joanne Hatfield
- Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; (I.S.G.); (H.R.); (E.A.); (S.B.-B.)
- Department of Immunology and Transfusion Medicine, Haukeland University Hospital, N-5009 Bergen, Norway
- Correspondence: (Ø.B.); (K.J.H.)
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11
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Andjelkov K, Conde-Green A, Mosahebi A. Smoking and Physical Activity Significantly Influence Stromal Vascular Fraction Cell Yield and Viability. Aesthetic Plast Surg 2021; 45:315-321. [PMID: 33083844 DOI: 10.1007/s00266-020-02008-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 10/04/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND Subcutaneous tissue is an abundant source of adipose-derived regenerative cells. It is readily available and easy to extract by means of liposuction, making it one of the most popular sources for tissue engineering and regenerative medical applications. METHODS The stromal vascular fraction (SVF) cell yield and viability of the lipoaspirate obtained from 43 patients undergoing elective liposuction were examined in correlation with their age, gender, body mass index, smoking status, and physical activity. The lipoaspirate was processed with the Celution® 800/CRS system to isolate the SVF and a few drops of the obtained pellet were used for cell counting with NecleoCounter® NC-100TM. RESULTS Twenty-eight (65.1%) were men and 15 (34.9%) were women with an average age of 40.7 ± 10.4 years (women) and 38.9 ± 11.8 years (men). Viable SVF cells/g fat was significantly correlated with smoking level (negative correlation, ρ= - 0.312, P < 0.05) and with marginal significance with female gender. Cell viability showed a significant negative correlation with physical activity level (ρ = - 0.432, P < 0.01); borderline significance for correlation of this parameter with smoking level should not be neglected. Other parameters did not influence the cell yield nor the viability of the stromal vascular fraction. CONCLUSION Many factors may influence SVF cell yield and viability. Our findings indicate that age and smoking significantly influenced SVF cell yield, age positively while smoking negatively. Increased physical activity had a negative correlation with SVF cell viability. LEVEL OF EVIDENCE N/A This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .
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Affiliation(s)
- Katarina Andjelkov
- Faculty of Medicine, University of Belgrade, BelPrime Clinic, 16 Brane Crncevica, 11000, Belgrade, Serbia.
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12
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Brigger D, Riether C, van Brummelen R, Mosher KI, Shiu A, Ding Z, Zbären N, Gasser P, Guntern P, Yousef H, Castellano JM, Storni F, Graff-Radford N, Britschgi M, Grandgirard D, Hinterbrandner M, Siegrist M, Moullan N, Hofstetter W, Leib SL, Villiger PM, Auwerx J, Villeda SA, Wyss-Coray T, Noti M, Eggel A. Eosinophils regulate adipose tissue inflammation and sustain physical and immunological fitness in old age. Nat Metab 2020; 2:688-702. [PMID: 32694825 PMCID: PMC7438316 DOI: 10.1038/s42255-020-0228-3] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 05/29/2020] [Indexed: 01/06/2023]
Abstract
Adipose tissue eosinophils (ATEs) are important in the control of obesity-associated inflammation and metabolic disease. However, the way in which ageing impacts the regulatory role of ATEs remains unknown. Here, we show that ATEs undergo major age-related changes in distribution and function associated with impaired adipose tissue homeostasis and systemic low-grade inflammation in both humans and mice. We find that exposure to a young systemic environment partially restores ATE distribution in aged parabionts and reduces adipose tissue inflammation. Approaches to restore ATE distribution using adoptive transfer of eosinophils from young mice into aged recipients proved sufficient to dampen age-related local and systemic low-grade inflammation. Importantly, restoration of a youthful systemic milieu by means of eosinophil transfers resulted in systemic rejuvenation of the aged host, manifesting in improved physical and immune fitness that was partially mediated by eosinophil-derived IL-4. Together, these findings support a critical function of adipose tissue as a source of pro-ageing factors and uncover a new role of eosinophils in promoting healthy ageing by sustaining adipose tissue homeostasis.
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Affiliation(s)
- Daniel Brigger
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Carsten Riether
- Tumor Immunology, Department for BioMedical Reserach, University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Robin van Brummelen
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Kira I Mosher
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
- Department of Chemical and Biological Engineering, University of California, Berkeley, CA, USA
| | - Alicia Shiu
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
- Amplitude Analytics Inc., San Francisco, CA, USA
| | - Zhaoqing Ding
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
- Johnson & Johnson Pharmaceutical Research & Development, L.L.C., San Diego, CA, USA
| | - Noemi Zbären
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Pascal Gasser
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Pascal Guntern
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Hanadie Yousef
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Joseph M Castellano
- Nash Family Department of Neuroscience, Department of Neurology, Friedman Brain Institute, Ronald M. Loeb Center for Alzheimer's Disease, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Federico Storni
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
- Department for Visceral Surgery and Medicine, Bern University Hospital, University of Bern, Bern, Switzerland
| | | | - Markus Britschgi
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
- Roche Pharma Research and Early Development, Neuroscience Discovery, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd, Basel, Switzerland
| | - Denis Grandgirard
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Magdalena Hinterbrandner
- Tumor Immunology, Department for BioMedical Reserach, University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Mark Siegrist
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Norman Moullan
- Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Willy Hofstetter
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Stephen L Leib
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Peter M Villiger
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Johan Auwerx
- Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Saul A Villeda
- Department of Anatomy, University of California San Francisco, San Francisco, CA, USA
| | - Tony Wyss-Coray
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
- Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA, USA
| | - Mario Noti
- Institute of Pathology, Division of Experimental Pathology, University of Bern, Bern, Switzerland.
- Department of Gastrointestinal Health, Immunology, Nestlé Research, Lausanne, Switzerland.
| | - Alexander Eggel
- Department of Rheumatology, Immunology and Allergology, Bern University Hospital, University of Bern, Bern, Switzerland.
- Department for BioMedical Research, University of Bern, Bern, Switzerland.
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13
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Abstract
T-cell immunity undergoes a complex and continuous remodeling with aging. Understanding those dynamics is essential in refining immunosuppression. Aging is linked to phenotypic and metabolic changes in T-cell immunity, many resulting into impaired function and compromised effectiveness. Those changes may impact clinical immunosuppression with evidences suggesting age-specific efficacies of some (CNI and mammalian target of rapamycin inhibitors) but not necessarily all immunosuppressants. Metabolic changes of T cells with aging have only recently been appreciated and may provide novel ways of immunosuppression. Here, we provide an update on changes of T-cell immunity in aging.
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Libertini G, Corbi G, Cellurale M, Ferrara N. Age-Related Dysfunctions: Evidence and Relationship with Some Risk Factors and Protective Drugs. BIOCHEMISTRY (MOSCOW) 2020; 84:1442-1450. [PMID: 31870248 DOI: 10.1134/s0006297919120034] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The theories interpreting senescence as a phenomenon favored by natural selection require the existence of specific, genetically determined and regulated mechanisms that cause a progressive age-related increase in mortality. The mechanisms defined in the subtelomere-telomere theory suggest that progressive slackening of cell turnover and decline in cellular functions are determined by the subtelomere-telomere-telomerase system, which causes a progressive "atrophic syndrome" in all organs and tissues. If the mechanisms underlying aging-related dysfunctions are similar and having the same origin, it could be hypothesized that equal interventions could produce similar effects. This article reviews the consequences of some factors (diabetes, obesity/dyslipidemia, hypertension, smoking, moderate use and abuse of alcohol) and classes of drugs [statins, angiotensin-converting enzyme (ACE) inhibitors, sartans] in accelerating and anticipating or in counteracting the process of aging. The evidence is compatible with the programmed aging paradigm and the mechanisms defined by the subtelomere-telomere theory but it has no obvious discriminating value against the theories of non-programmed aging paradigm. However, the existence of mechanisms, determined by the subtelomere-telomere-telomerase system and causing a progressive age-related decline in fitness through gradual cell senescence and cell senescence, is not justifiable without an evolutionary motivation. Their existence is expected by the programmed aging paradigm, while is incompatible with the opposite paradigm.
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Affiliation(s)
- G Libertini
- Independent researcher, member of the Italian Society for Evolutionary Biology, Italy.
| | - G Corbi
- Department of Medicine and Health Sciences, University of Molise, and Italian Society of Gerontology and Geriatrics (SIGG), Campobasso, 86100, Italy.
| | - M Cellurale
- Department of Translational Medical Sciences, Federico II University of Naples, Naples, Italy.
| | - N Ferrara
- Department of Translational Medical Sciences, Federico II University of Naples, Naples, Italy. .,Istituti Clinici Scientifici Maugeri IRCCS, SpA SB, Telese Terme (BN), Italy
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15
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Abstract
Genetic defects that accumulate in haematopoietic stem cells (HSCs) are thought to be responsible for age-related changes in haematopoiesis that include a decline in lymphopoiesis and skewing towards the myeloid lineage. This HSC-centric view is based largely on studies showing that HSCs from aged mice exhibit these lineage biases following transplantation into irradiated young recipient mice. In this Opinion article, we make the case that the reliance on this approach has led to inaccurate conclusions regarding the effects of ageing on blood-forming stem cells; we suggest instead that changes in the environment contribute to haematopoietic system ageing. We propose that a complete understanding of how ageing affects haematopoiesis depends on the analysis of blood cell production in unperturbed mice. We describe how this can be achieved using in situ fate mapping. This approach indicates that changes in downstream progenitors, in addition to any HSC defects, may explain the reduced lymphopoiesis and sustained myelopoiesis that occur during ageing.
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16
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Pioli PD, Casero D, Montecino-Rodriguez E, Morrison SL, Dorshkind K. Plasma Cells Are Obligate Effectors of Enhanced Myelopoiesis in Aging Bone Marrow. Immunity 2019; 51:351-366.e6. [PMID: 31303400 DOI: 10.1016/j.immuni.2019.06.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 04/10/2019] [Accepted: 06/12/2019] [Indexed: 12/25/2022]
Abstract
Aging results in increased myelopoiesis, which is linked to the increased incidence of myeloid leukemias and production of myeloid-derived suppressor cells. Here, we examined the contribution of plasma cells (PCs) to age-related increases in myelopoiesis, as PCs exhibit immune regulatory function and sequester in bone marrow (BM). PC number was increased in old BM, and they exhibited high expression of genes encoding inflammatory cytokines and pathogen sensors. Antibody-mediated depletion of PCs from old mice reduced the number of myeloid-biased hematopoietic stem cells and mature myeloid cells to levels in young animals, but lymphopoiesis was not rejuvenated, indicating that redundant mechanisms inhibit that process. PCs also regulated the production of inflammatory factors from BM stromal cells, and disruption of the PC-stromal cell circuitry with inhibitors of the cytokines IL-1 and TNF-α attenuated myelopoiesis in old mice. Thus, the age-related increase in myelopoiesis is driven by an inflammatory network orchestrated by PCs.
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Affiliation(s)
- Peter D Pioli
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - David Casero
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | | | - Sherie L Morrison
- Department of Microbiology, Immunology and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Kenneth Dorshkind
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.
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17
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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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18
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Montecino-Rodriguez E, Kong Y, Casero D, Rouault A, Dorshkind K, Pioli PD. Lymphoid-Biased Hematopoietic Stem Cells Are Maintained with Age and Efficiently Generate Lymphoid Progeny. Stem Cell Reports 2019; 12:584-596. [PMID: 30799276 PMCID: PMC6409485 DOI: 10.1016/j.stemcr.2019.01.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 01/18/2019] [Accepted: 01/21/2019] [Indexed: 12/26/2022] Open
Abstract
Current models propose that reductions in the number of lymphoid-biased hematopoietic stem cells (Ly-HSCs) underlie age-related declines in lymphopoiesis. We show that Ly-HSCs do not decline in number with age. Old Ly-HSCs exhibit changes in gene expression and a myeloid-biased genetic profile, but we demonstrate that they retain normal lymphoid potential when removed from the old in vivo environment. Additional studies showing that interleukin-1 inhibits Ly-HSC lymphoid potential provide support for the hypothesis that increased production of inflammatory cytokines during aging underlies declines in lymphocyte production. These results indicate that current models proposing that lymphopoiesis declines with age due to loss of Ly-HSCs require revision and provide an additional perspective on why lymphocyte development in the elderly is attenuated. Ly-HSCs do not decline in number with age Transcriptome changes in old Ly-HSCs result in the acquisition of a myeloid signature Ly-HSCs efficiently generate lymphocytes when removed from the old environment IL-1 blocks lymphoid potential from Ly-HSCs and My-HSCs
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Affiliation(s)
| | - Ying Kong
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - David Casero
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Adrien Rouault
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Kenneth Dorshkind
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.
| | - Peter D Pioli
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
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19
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Bahney CS, Zondervan RL, Allison P, Theologis A, Ashley JW, Ahn J, Miclau T, Marcucio RS, Hankenson KD. Cellular biology of fracture healing. J Orthop Res 2019; 37:35-50. [PMID: 30370699 PMCID: PMC6542569 DOI: 10.1002/jor.24170] [Citation(s) in RCA: 250] [Impact Index Per Article: 50.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/27/2018] [Indexed: 02/04/2023]
Abstract
The biology of bone healing is a rapidly developing science. Advances in transgenic and gene-targeted mice have enabled tissue and cell-specific investigations of skeletal regeneration. As an example, only recently has it been recognized that chondrocytes convert to osteoblasts during healing bone, and only several years prior, seminal publications reported definitively that the primary tissues contributing bone forming cells during regeneration were the periosteum and endosteum. While genetically modified animals offer incredible insights into the temporal and spatial importance of various gene products, the complexity and rapidity of healing-coupled with the heterogeneity of animal models-renders studies of regenerative biology challenging. Herein, cells that play a key role in bone healing will be reviewed and extracellular mediators regulating their behavior discussed. We will focus on recent studies that explore novel roles of inflammation in bone healing, and the origins and fates of various cells in the fracture environment. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.
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Affiliation(s)
- Chelsea S. Bahney
- Department of Orthopaedic Surgery, University of California at San Francisco, San Francisco, California
| | - Robert L. Zondervan
- Department of Physiology, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan
| | - Patrick Allison
- Department of Physiology, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan
| | - Alekos Theologis
- Department of Orthopaedic Surgery, University of California at San Francisco, San Francisco, California
| | - Jason W. Ashley
- Department of Biology, Eastern Washington University, Cheney, Washington
| | - Jaimo Ahn
- Department of Biology, Eastern Washington University, Cheney, Washington
| | - Theodore Miclau
- Department of Orthopaedic Surgery, University of California at San Francisco, San Francisco, California
| | - Ralph S. Marcucio
- Department of Orthopaedic Surgery, University of California at San Francisco, San Francisco, California
| | - Kurt D. Hankenson
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan
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20
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Ross K, Senapati S, Alley J, Darling R, Goodman J, Jefferson M, Uz M, Guo B, Yoon KJ, Verhoeven D, Kohut M, Mallapragada S, Wannemuehler M, Narasimhan B. Single dose combination nanovaccine provides protection against influenza A virus in young and aged mice. Biomater Sci 2019; 7:809-821. [DOI: 10.1039/c8bm01443d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Combined polyanhydride nanoparticles and pentablock copolymer micelles provide protection against homologous challenge in aged mice.
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21
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Florian MC, Klose M, Sacma M, Jablanovic J, Knudson L, Nattamai KJ, Marka G, Vollmer A, Soller K, Sakk V, Cabezas-Wallscheid N, Zheng Y, Mulaw MA, Glauche I, Geiger H. Aging alters the epigenetic asymmetry of HSC division. PLoS Biol 2018; 16:e2003389. [PMID: 30235201 PMCID: PMC6168157 DOI: 10.1371/journal.pbio.2003389] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/02/2018] [Accepted: 08/23/2018] [Indexed: 01/01/2023] Open
Abstract
Hematopoietic stem cells (HSCs) balance self-renewal and differentiation to maintain homeostasis. With aging, the frequency of polar HSCs decreases. Cell polarity in HSCs is controlled by the activity of the small RhoGTPase cell division control protein 42 (Cdc42). Here we demonstrate—using a comprehensive set of paired daughter cell analyses that include single-cell 3D confocal imaging, single-cell transplants, single-cell RNA-seq, and single-cell transposase-accessible chromatin sequencing (ATAC-seq)—that the outcome of HSC divisions is strongly linked to the polarity status before mitosis, which is in turn determined by the level of the activity Cdc42 in stem cells. Aged apolar HSCs undergo preferentially self-renewing symmetric divisions, resulting in daughter stem cells with reduced regenerative capacity and lymphoid potential, while young polar HSCs undergo preferentially asymmetric divisions. Mathematical modeling in combination with experimental data implies a mechanistic role of the asymmetric sorting of Cdc42 in determining the potential of daughter cells via epigenetic mechanisms. Therefore, molecules that control HSC polarity might serve as modulators of the mode of stem cell division regulating the potential of daughter cells. Stem cells are unique cells that can differentiate to produce more stem cells or other types of cells and can divide both symmetrically (to produce daughter cells with the same fate) and asymmetrically (to produce one daughter cell that retains stem cell potential and one that differentiates). The mechanisms that control the outcome of stem cell divisions have been the focus of many studies; however, they remain mainly unknown. Here, we have analyzed these mechanisms in murine hematopoietic stem cells (HSCs) by directly comparing the epigenetic signature, the transcriptome, and the function of the two daughter cells stemming from the first division of either a young or an aged HSC. We observe that, while young HSCs divide mainly asymmetrically, aged HSCs divide primarily symmetrically. We find that the mode of division is tightly linked to stem cell polarity and is regulated by the activity level of the small RhoGTPase cell division control protein 42 (Cdc42). In addition, we show that the potential of daughter cells is further linked to the amount of the epigenetic mark H4K16ac and also to the amount of open chromatin allocated to a daughter cell, but it is not linked to its transcriptome. In summary, our study suggests that HSC polarity linked to Cdc42 activity drives the mode of division, while epigenetic mechanisms determine the functional outcome of the stem cell division.
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Affiliation(s)
- M. Carolina Florian
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
- * E-mail: (MCF); (HG)
| | - Markus Klose
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Mehmet Sacma
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Jelena Jablanovic
- Max Planck Institute (MPI) of Immunobiology and Epigenetics, Freiburg, Germany
| | - Luke Knudson
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Kalpana J. Nattamai
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Gina Marka
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Angelika Vollmer
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Karin Soller
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | - Vadim Sakk
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
| | | | - Yi Zheng
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Medhanie A. Mulaw
- Institute of Experimental Cancer Research, Medical Faculty, University of Ulm, Ulm, Germany
| | - Ingmar Glauche
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Hartmut Geiger
- Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
- * E-mail: (MCF); (HG)
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22
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Konieczny J, Arranz L. Updates on Old and Weary Haematopoiesis. Int J Mol Sci 2018; 19:ijms19092567. [PMID: 30158459 PMCID: PMC6163425 DOI: 10.3390/ijms19092567] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/20/2018] [Accepted: 08/26/2018] [Indexed: 12/13/2022] Open
Abstract
Blood formation, or haematopoiesis, originates from haematopoietic stem cells (HSCs), whose functions and maintenance are regulated in both cell- and cell non-autonomous ways. The surroundings of HSCs in the bone marrow create a specific niche or microenvironment where HSCs nest that allows them to retain their unique characteristics and respond rapidly to external stimuli. Ageing is accompanied by reduced regenerative capacity of the organism affecting all systems, due to the progressive decline of stem cell functions. This includes blood and HSCs, which contributes to age-related haematological disorders, anaemia, and immunosenescence, among others. Furthermore, chronological ageing is characterised by myeloid and platelet HSC skewing, inflammageing, and expanded clonal haematopoiesis, which may be the result of the accumulation of preleukaemic lesions in HSCs. Intriguingly, haematological malignancies such as acute myeloid leukaemia have a high incidence among elderly patients, yet not all individuals with clonal haematopoiesis develop leukaemias. Here, we discuss recent work on these aspects, their potential underlying molecular mechanisms, and the first cues linking age-related changes in the HSC niche to poor HSC maintenance. Future work is needed for a better understanding of haematopoiesis during ageing. This field may open new avenues for HSC rejuvenation and therapeutic strategies in the elderly.
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Affiliation(s)
- Joanna Konieczny
- Stem Cell Aging and Cancer Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT, The Arctic University of Norway, 9019 Tromsø, Norway.
| | - Lorena Arranz
- Stem Cell Aging and Cancer Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT, The Arctic University of Norway, 9019 Tromsø, Norway.
- Department of Hematology, University Hospital of North Norway, 9019 Tromsø, Norway.
- Young Associate Investigator, Norwegian Center for Molecular Medicine (NCMM), 0349 Oslo, Norway.
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23
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Adawi M, Pastukh N, Saaida G, Sirchan R, Watad A, Blum A. Inhibition of endothelial progenitor cells may explain the high cardiovascular event rate in patients with rheumatoid arthritis. QJM 2018; 111:525-529. [PMID: 29788448 DOI: 10.1093/qjmed/hcy099] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 04/30/2018] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Rheumatoid arthritis (RA) patients may suffer cardiovascular (CV) events much more than the general population, and CV disease is the leading cause of death in patients with RA. Our hypothesis was that impaired function of endothelial progenitor cells may contribute to endothelial dysfunction and the clinical CV events of patients with RA. METHODS About 27 RA patients (9 males and 18 females) with an active disease and 13 healthy subjects who served as the control group (nine males and four females) were enrolled to this prospective study. The ability to grow in culture colony-forming units of endothelial progenitor cells (CFU-EPCs) was measured, as well as their endothelial function using high-resolution ultrasonography of the brachial artery, and levels of C reactive protein (CRP) in the serum. For statistical analysis, we used the Student's t-test. RESULTS As a group, patients with RA were older (P < 0.0001), had severe endothelial dysfunction (P<0.0001), with impaired ability to grow CFU-EPCs (P<0.0001), and a higher inflammatory state (P = 0001). No difference was observed in BMI. All RA patients had an active disease (DAS28 3.9 ± 0.9) for 9.2 ± 6.5 years. The same differences were observed in both genders. CONCLUSIONS Patients with RA had an impaired ability to grow EPCs and severe endothelial dysfunction. Inability to grow colonies of EPCs reflects the impaired regenerative capacity of patients with RA and may explain the endothelial dysfunction and the high CV event rate among patients with RA.
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Affiliation(s)
- M Adawi
- Department of Medicine and the Rheumatology Unit, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
- Azrieli Faculty of Medicine, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
| | - N Pastukh
- The Vascular Research Laboratory, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
| | - G Saaida
- Azrieli Faculty of Medicine, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
| | - R Sirchan
- Department of Medicine and the Rheumatology Unit, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
| | - A Watad
- Department of Medicine 'B', The Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center, Tel-Hashomer, Israel
| | - A Blum
- Department of Medicine and the Rheumatology Unit, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
- Azrieli Faculty of Medicine, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
- The Vascular Research Laboratory, Baruch Padeh Medical Center, Bar Ilan University, Galilee, Israel
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24
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Lidonnici MR, Ferrari G. Gene therapy and gene editing strategies for hemoglobinopathies. Blood Cells Mol Dis 2018; 70:87-101. [DOI: 10.1016/j.bcmd.2017.12.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 12/19/2017] [Accepted: 12/27/2017] [Indexed: 10/24/2022]
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25
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Loftus TJ, Kannan KB, Carter CS, Plazas JM, Mira JC, Brakenridge SC, Leeuwenburgh C, Efron PA, Mohr AM. Persistent injury-associated anemia in aged rats. Exp Gerontol 2018; 103:63-68. [PMID: 29307734 DOI: 10.1016/j.exger.2018.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 11/06/2017] [Accepted: 01/02/2018] [Indexed: 01/17/2023]
Abstract
BACKGROUND Hypercatecholaminemia and bone marrow dysfunction have been implicated in the pathophysiology of persistent-injury associated anemia. The elderly may be vulnerable to this phenomenon due to high basal and peak catecholamine levels, impaired erythroid progenitor growth, and baseline anemia. We hypothesized that aged F344-BN rats subjected to severe trauma and chronic stress would have persistent injury-associated anemia. METHODS Male F344-BN rats age 25months were randomly allocated to: naïve (n=8), lung contusion (LC, n=9), LC followed by daily chronic restraint stress (LC/CS, n=9), LC followed immediately by hemorrhagic shock (LCHS, n=8), and LCHS followed by daily CS (LCHS/CS, n=8). Urine norepinephrine was measured on days one and seven. Locomotor testing was performed on day five. Bone marrow cellularity, hematopoietic progenitor growth, and peripheral blood hemoglobin levels were assessed at sacrifice on day seven. Data are presented as mean±standard deviation, *p<0.05 vs. naïve. RESULTS Norepinephrine levels (ng/mL) were significantly elevated one day after LCHS (420±239* vs. naïve: 97±71) and LCHS/CS (375±185*), and remained significantly elevated on day seven for LCHS/CS (359±99*), but not LCHS (212±130). On locomotor testing, groups subjected to CS traveled shorter distances at lower velocities and spent less time in the center of the cage. Colony forming units-erythroid (colonies/plate), representing late erythroid progenitors, were significantly decreased after LC/CS (40±1* vs. naïve: 47±4), LCHS (40±1*), and LCHS/CS (38±3*). LCHS/CS animals had significantly lower hemoglobin (g/dL) than naïve animals (13.3±1.3* vs. naïve: 15.2±0.9). CONCLUSIONS Persistent injury-associated anemia occurs in aged rats. Further research is needed to determine whether the pathophysiology of this phenomenon differs from that of younger rats, and to translate these findings to elderly trauma patients.
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Affiliation(s)
- Tyler J Loftus
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
| | - Kolenkode B Kannan
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
| | - Christy S Carter
- University of Florida Health, Institute on Aging, Gainesville, FL, United States.
| | | | - Juan C Mira
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
| | - Scott C Brakenridge
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
| | - Christiaan Leeuwenburgh
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States; University of Florida Health, Institute on Aging, Gainesville, FL, United States.
| | - Philip A Efron
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
| | - Alicia M Mohr
- University of Florida Health, Department of Surgery and Sepsis and Critical Illness Research Center, Gainesville, FL, United States.
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The impact of aging on primate hematopoiesis as interrogated by clonal tracking. Blood 2018; 131:1195-1205. [PMID: 29295845 DOI: 10.1182/blood-2017-08-802033] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 12/21/2017] [Indexed: 01/04/2023] Open
Abstract
Age-associated changes in hematopoietic stem and progenitor cells (HSPCs) have been carefully documented in mouse models but poorly characterized in primates and humans. To investigate clinically relevant aspects of hematopoietic aging, we compared the clonal output of thousands of genetically barcoded HSPCs in aged vs young macaques after autologous transplantation. Aged macaques showed delayed emergence of output from multipotent (MP) clones, with persistence of lineage-biased clones for many months after engraftment. In contrast to murine aging models reporting persistence of myeloid-biased HSPCs, aged macaques demonstrated persistent output from both B-cell and myeloid-biased clones. Clonal expansions of MP, myeloid-biased, and B-biased clones occurred in aged macaques, providing a potential model for human clonal hematopoiesis of indeterminate prognosis. These results suggest that long-term MP HSPC output is impaired in aged macaques, resulting in differences in the kinetics and lineage reconstitution patterns between young and aged primates in an autologous transplantation setting.
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McHugh D, Gil J. Senescence and aging: Causes, consequences, and therapeutic avenues. J Cell Biol 2017; 217:65-77. [PMID: 29114066 PMCID: PMC5748990 DOI: 10.1083/jcb.201708092] [Citation(s) in RCA: 648] [Impact Index Per Article: 92.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 10/09/2017] [Accepted: 10/17/2017] [Indexed: 12/21/2022] Open
Abstract
Aging is the major risk factor for cancer, cardiovascular disease, diabetes, and neurodegenerative disorders. Although we are far from understanding the biological basis of aging, research suggests that targeting the aging process itself could ameliorate many age-related pathologies. Senescence is a cellular response characterized by a stable growth arrest and other phenotypic alterations that include a proinflammatory secretome. Senescence plays roles in normal development, maintains tissue homeostasis, and limits tumor progression. However, senescence has also been implicated as a major cause of age-related disease. In this regard, recent experimental evidence has shown that the genetic or pharmacological ablation of senescent cells extends life span and improves health span. Here, we review the cellular and molecular links between cellular senescence and aging and discuss the novel therapeutic avenues that this connection opens.
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Affiliation(s)
- Domhnall McHugh
- Medical Research Council London Institute of Medical Sciences, London, England, UK.,Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, England, UK
| | - Jesús Gil
- Medical Research Council London Institute of Medical Sciences, London, England, UK .,Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, England, UK
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Interleukin-7 and Immunosenescence. J Immunol Res 2017; 2017:4807853. [PMID: 28484723 PMCID: PMC5397725 DOI: 10.1155/2017/4807853] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 02/01/2017] [Accepted: 02/19/2017] [Indexed: 12/21/2022] Open
Abstract
The age of an individual is an important, independent risk factor for many of the most common diseases afflicting modern societies. Interleukin-7 (IL-7) plays a central, critical role in the homeostasis of the immune system. Recent studies support a critical role for IL-7 in the maintenance of a vigorous healthspan. We describe the role of IL-7 and its receptor in immunosenescence, the aging of the immune system. An understanding of the role that IL-7 plays in aging may permit parsimonious preventative or therapeutic solutions for diverse conditions. Perhaps IL-7 might be used to "tune" the immune system to optimize human healthspan and longevity.
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29
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Mosaic chromosome 20q deletions are more frequent in the aging population. Blood Adv 2017; 1:380-385. [PMID: 29296952 DOI: 10.1182/bloodadvances.2016003129] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 01/09/2017] [Indexed: 11/20/2022] Open
Abstract
Deletions on the long-arm of chromosome 20, del(20q), are common karyotypic abnormalities in myeloid disorders. Bioinformatic analyses of the B-allele frequency and log R ratio values from genome-wide association data have identified individuals who are mosaic for large structural abnormalities (>2 Mb). We investigated the most common autosomal event, namely mosaic del(20q), in 46 254 nonhematologic cancer cases and 36 229 cancer-free controls. We detected 91 mosaic del(20q) in leukocytes (80%) and buccal material (20%). The mosaic del(20q) mapped to a well-characterized minimally deleted region (MDR) reported in myeloid disorders. Common breakpoint clusters map to the coordinates of 29.9 to 31.5 Mb on the centromeric side of mosaic del(20q), and 42.0 to 45.4 Mb and 48.1 to 50.7 Mb on the telomeric end (GRCh36). Multivariate analyses suggest del(20q) increases with age, and is more common in males but less common in individuals of African ancestry. No conclusive associations were noted between the presence of mosaic del(20q) and subsequent solid tumor risk. Our observations demonstrate that the MDR of del(20q) is the most common large scale mosaic autosomal abnormality in whole blood and has a frequency of ∼1 in every 1000 adults over the age of 50, which exceeds the expected incidence of myeloid leukemia in the population. Our results indicate that subclonal mosaic events of a region implicated in myeloid disorders on 20q are more frequent than the predicted population-estimated incidence of myeloid diseases, and thus suggest that these events can be tolerated until additional events accumulate that drive myeloid disorders.
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Abstract
Until recently, there was broad consensus in the stem cell aging field that the phenotype of aged hematopoietic stem cells (HSCs) is fixed-dominated by cell-intrinsic regulatory mechanisms that cannot be altered by pharmacological or genetic means. The conventional thinking was that HSC aging could not be reverted by therapeutic intervention. This paradigm has started to shift dramatically, primarily because hallmarks of aged HSCs have been successfully reverted by distinct experimental approaches by multiple laboratories. We will discuss in this review these hallmarks of HSCs aging and the novel approaches that successfully ameliorated or even reverted aging-associated hallmarks of aged HSCs.
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Affiliation(s)
- Novella Guidi
- Institute for Molecular Medicine, Ulm University, Ulm, Germany.
| | - Hartmut Geiger
- Institute for Molecular Medicine, Ulm University, Ulm, Germany; Division of Experimental Hematology and Cancer Biology, Cincinnati Children׳s Hospital Medical Center, Cincinnati, OH, USA; Aging Research Center, Ulm University, Ulm, Germany.
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Differential Characterization of Two Kinds of Stem Cells Isolated from Rabbit Nucleus Pulposus and Annulus Fibrosus. Stem Cells Int 2016; 2016:8283257. [PMID: 27703485 PMCID: PMC5040834 DOI: 10.1155/2016/8283257] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/18/2016] [Accepted: 08/11/2016] [Indexed: 01/07/2023] Open
Abstract
Objective. Nucleus pulposus (NP) and annulus fibrosus (AF) are two main components of intervertebral disc (IVD). We aimed to figure out whether NP and AF also contain stem cells and whether these stem cells share common properties with chondrocytes and/or fibroblasts in their phenotypes or whether they are completely different types of cells with different characteristics. Design. The disk cells were isolated from AF and NP tissues of the same lumbar spine of the rabbits. The properties of these disk cells were characterized by their morphology, population doubling time (PDT), stem cell marker expression, and multidifferentiation potential using tissue culture techniques, immunocytochemistry, and RT-PCR. Results. Both disk cells formed colonies in culture and expressed stem cell markers, nucleostemin, Oct-4, SSEA-4, and Stro-1, at early passages. However, after 5 passages, AFSCs became elongated and NPSCs appeared senescent. Conclusion. This study indicated that IVD contains stem cells and the characteristics of AFSCs and NPSCs are intrinsically different. The findings of this study may provide basic scientific data for understanding the properties of IVD cells and the mechanisms of lower back pain.
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A Periodic Diet that Mimics Fasting Promotes Multi-System Regeneration, Enhanced Cognitive Performance, and Healthspan. Cell Metab 2015; 22:86-99. [PMID: 26094889 PMCID: PMC4509734 DOI: 10.1016/j.cmet.2015.05.012] [Citation(s) in RCA: 546] [Impact Index Per Article: 60.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/02/2015] [Accepted: 05/08/2015] [Indexed: 12/14/2022]
Abstract
Prolonged fasting (PF) promotes stress resistance, but its effects on longevity are poorly understood. We show that alternating PF and nutrient-rich medium extended yeast lifespan independently of established pro-longevity genes. In mice, 4 days of a diet that mimics fasting (FMD), developed to minimize the burden of PF, decreased the size of multiple organs/systems, an effect followed upon re-feeding by an elevated number of progenitor and stem cells and regeneration. Bi-monthly FMD cycles started at middle age extended longevity, lowered visceral fat, reduced cancer incidence and skin lesions, rejuvenated the immune system, and retarded bone mineral density loss. In old mice, FMD cycles promoted hippocampal neurogenesis, lowered IGF-1 levels and PKA activity, elevated NeuroD1, and improved cognitive performance. In a pilot clinical trial, three FMD cycles decreased risk factors/biomarkers for aging, diabetes, cardiovascular disease, and cancer without major adverse effects, providing support for the use of FMDs to promote healthspan.
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Septic Shock in Advanced Age: Transcriptome Analysis Reveals Altered Molecular Signatures in Neutrophil Granulocytes. PLoS One 2015; 10:e0128341. [PMID: 26047321 PMCID: PMC4457834 DOI: 10.1371/journal.pone.0128341] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 04/26/2015] [Indexed: 01/08/2023] Open
Abstract
Sepsis is one of the highest causes of mortality in hospitalized people and a common complication in both surgical and clinical patients admitted to hospital for non-infectious reasons. Sepsis is especially common in older people and its incidence is likely to increase substantially as a population ages. Despite its increased prevalence and mortality in older people, immune responses in the elderly during septic shock appear similar to that in younger patients. The purpose of this study was to conduct a genome-wide gene expression analysis of circulating neutrophils from old and young septic patients to better understand how aged individuals respond to severe infectious insult. We detected several genes whose expression could be used to differentiate immune responses of the elderly from those of young people, including genes related to oxidative phosphorylation, mitochondrial dysfunction and TGF-β signaling, among others. Our results identify major molecular pathways that are particularly affected in the elderly during sepsis, which might have a pivotal role in worsening clinical outcomes compared with young people with sepsis.
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Birbrair A, Zhang T, Wang ZM, Messi ML, Mintz A, Delbono O. Pericytes at the intersection between tissue regeneration and pathology. Clin Sci (Lond) 2015; 128:81-93. [PMID: 25236972 PMCID: PMC4200531 DOI: 10.1042/cs20140278] [Citation(s) in RCA: 173] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Perivascular multipotent cells, pericytes, contribute to the generation and repair of various tissues in response to injury. They are heterogeneous in their morphology, distribution, origin and markers, and elucidating their molecular and cellular differences may inform novel treatments for disorders in which tissue regeneration is either impaired or excessive. Moreover, these discoveries offer novel cellular targets for therapeutic approaches to many diseases. This review discusses recent studies that support the concept that pericyte subtypes play a distinctive role in myogenesis, neurogenesis, adipogenesis, fibrogenesis and angiogenesis.
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Affiliation(s)
- Alexander Birbrair
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
- Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
| | - Tan Zhang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
| | - Zhong-Min Wang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
| | - Maria Laura Messi
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
| | - Akiva Mintz
- Department of Neurosurgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
| | - Osvaldo Delbono
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
- Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina, Medical Center Boulevard, Winston Salem, NC 27157, U.S.A
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Jiang F, Feng Z, Liu H, Zhu J. Involvement of Plant Stem Cells or Stem Cell-Like Cells in Dedifferentiation. FRONTIERS IN PLANT SCIENCE 2015; 6:1028. [PMID: 26635851 PMCID: PMC4649052 DOI: 10.3389/fpls.2015.01028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 11/05/2015] [Indexed: 05/02/2023]
Abstract
Dedifferentiation is the transformation of cells from a given differentiated state to a less differentiated or stem cell-like state. Stem cell-related genes play important roles in dedifferentiation, which exhibits similar histone modification and DNA methylation features to stem cell maintenance. Hence, stem cell-related factors possibly synergistically function to provide a specific niche beneficial to dedifferentiation. During callus formation in Arabidopsis petioles, cells adjacent to procambium cells (stem cell-like cells) are dedifferentiated and survive more easily than other cell types. This finding indicates that stem cells or stem cell-like cells may influence the dedifferentiating niche. In this paper, we provide a brief overview of stem cell maintenance and dedifferentiation regulation. We also summarize current knowledge of genetic and epigenetic mechanisms underlying the balance between differentiation and dedifferentiation. Furthermore, we discuss the correlation of stem cells or stem cell-like cells with dedifferentiation.
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Affiliation(s)
- Fangwei Jiang
- Department of Molecular and Cell Biology, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Zhenhua Feng
- Department of Molecular and Cell Biology, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Hailiang Liu
- Translational Center for Stem Cell Research, Tongji University School of Medicine, Tongji Hospital, Shanghai, China
- *Correspondence: Hailiang Liu, ; Jian Zhu,
| | - Jian Zhu
- Department of Molecular and Cell Biology, School of Life Science and Technology, Tongji University, Shanghai, China
- *Correspondence: Hailiang Liu, ; Jian Zhu,
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36
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Voskoboynik A, Weissman IL. Botryllus schlosseri, an emerging model for the study of aging, stem cells, and mechanisms of regeneration. INVERTEBR REPROD DEV 2014; 59:33-38. [PMID: 26136618 PMCID: PMC4464096 DOI: 10.1080/07924259.2014.944673] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Accepted: 06/23/2014] [Indexed: 12/22/2022]
Abstract
The decline of tissue regenerative potential with the loss of stem cell function is a hallmark of mammalian aging. We study Botryllus schlosseri, a colonial chordate which exhibits robust stem cell-mediated regeneration capacities throughout life. Larvae, derived by sexual reproduction and chordate development, metamorphose to clonal founders that undergo weekly formation of new individuals by budding from stem cells. Individuals are transient structures which die through massive apoptosis, and successive buds mature to replicate an entire new body. As a result, their stem cells, which are the only self-renewing cells in a tissue, are the only cells which remain through the entire life of the genotype and retain the effects of time. During aging, a significant decrease in the colonies' regenerative potential is observed and both sexual and asexual reproductions will eventually halt. When a parent colony is experimentally separated into a number of clonal replicates, they frequently undergo senescence simultaneously, suggesting a heritable factor that determines lifespan in these colonies. The availability of the recently published B. schlosseri genome coupled with its unique life cycle features promotes the use of this model organism for the study of the evolution of aging, stem cells, and mechanisms of regeneration.
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Affiliation(s)
- Ayelet Voskoboynik
- Department of Pathology, Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, and Hopkins Marine Station , Stanford , CA , USA
| | - Irving L Weissman
- Department of Pathology, Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, and Hopkins Marine Station , Stanford , CA , USA ; Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine , Stanford , CA , USA
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37
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Libertini G. The programmed aging paradigm: How we get old. BIOCHEMISTRY (MOSCOW) 2014; 79:1004-16. [DOI: 10.1134/s0006297914100034] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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38
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Immune profile predicts survival and reflects senescence in a small, long-lived mammal, the greater sac-winged bat (Saccopteryx bilineata). PLoS One 2014; 9:e108268. [PMID: 25254988 PMCID: PMC4177908 DOI: 10.1371/journal.pone.0108268] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 08/21/2014] [Indexed: 01/16/2023] Open
Abstract
The immune system imposes costs that may have to be traded against investment of resources in other costly life-history traits. Yet, it is unknown if a trade-off between immunity and longevity occurs in free-ranging mammals. Here, we tested if age and survival, two aspects associated with longevity, are linked to immune parameters in an 8 g bat species. Using a combination of cross-sectional and longitudinal data, we assessed whether total white blood cell (WBC) counts, bacterial killing ability of the plasma (BKA) and immunoglobulin G (IgG) concentration change with age. Furthermore, we asked if these immune parameters impose costs resulting in decreased survival probabilities. We found that WBC counts decreased with age both within and among individuals. IgG concentrations were higher in older individuals, but did not change with age within individuals. Furthermore, individuals with above average WBC counts or IgG concentration had lower probabilities to survive the next six months. High WBC counts and IgG concentrations may reflect infections with parasites and pathogens, however, individuals that were infected with trypanosomes or nematodes showed neither higher WBC counts or IgG concentrations, nor was infection connected with survival rates. BKA was higher in infected compared with uninfected bats, but not related to age or survival. In conclusion, cellular (WBC) and humoral (IgG) parts of the immune system were both connected to age and survival, but not to parasite infections, which supports the hypothesis that energetically costly immunological defences are traded against other costly life-history traits, leading to a reduced lifespan in this free-ranging mammal.
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39
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Geiger H, Zheng Y. Regulation of hematopoietic stem cell aging by the small RhoGTPase Cdc42. Exp Cell Res 2014; 329:214-9. [PMID: 25220425 DOI: 10.1016/j.yexcr.2014.09.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 09/01/2014] [Indexed: 11/16/2022]
Abstract
Aging of stem cells might be the underlying cause of tissue aging in tissue that in the adult heavily rely on stem cell activity, like the blood forming system. Hematopoiesis, the generation of blood forming cells, is sustained by hematopoietic stem cells. In this review article, we introduce the canonical set of phenotypes associated with aged HSCs, focus on the novel aging-associated phenotype apolarity caused by elevated activity of the small RhoGTPase in aged HSCs, discuss the role of Cdc42 in hematopoiesis and describe that pharmacological inhibition of Cdc42 activity in aged HSCs results in functionally young and thus rejuvenated HSCs.
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Affiliation(s)
- Hartmut Geiger
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children׳s Hospital Medical Center and University of Cincinnati, Cincinnati, OH 45229, USA; Institute for Molecular Medicine, Stem Cells and Aging, Ulm University, Ulm 89091, Germany; aging research center, Ulm University, Ulm, Germany.
| | - Yi Zheng
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children׳s Hospital Medical Center and University of Cincinnati, Cincinnati, OH 45229, USA
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40
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Kim MJ, Kim MH, Kim SA, Chang JS. Age-related Deterioration of Hematopoietic Stem Cells. Int J Stem Cells 2014; 1:55-63. [PMID: 24855509 DOI: 10.15283/ijsc.2008.1.1.55] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2008] [Indexed: 01/12/2023] Open
Abstract
Aging is the process of system deterioration over time in the whole body. Stem cells are self-renewing and therefore have been considered exempt from the aging process. Earlier studies by Hayflick showed that there is an intrinsic limit to the number of divisions that mammalian somatic cells can undergo, and cycling kinetics and ontogeny-related studies strongly suggest that even the most primitive stem cell functions exhibit a certain degree of aging. Despite these findings, studies on the effects of aging on stem cell functions are inconclusive. Here we review the age-related properties of hematopoietic stem cells in terms of intrinsic and extrinsic alterations, proliferative potential, signaling molecules, telomere and telomerase, senescence and cancer issues, regenerative potential and other indications of stem cell aging are discussed in detail.
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Affiliation(s)
- Mi Jung Kim
- Department of Laboratory Medicine, University of Ulsan College of Medicine ; Cell and Molecular Biology Laboratory, Asan Institute for Life Sciences, AMC
| | - Min Hwan Kim
- Cell and Molecular Biology Laboratory, Asan Institute for Life Sciences, AMC
| | - Seung Ah Kim
- Cell and Molecular Biology Laboratory, Asan Institute for Life Sciences, AMC
| | - Jae Suk Chang
- Department of Orthopedic Surgery, University of Ulsan College of Medicine, Seoul, Korea
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41
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Geiger H, Denkinger M, Schirmbeck R. Hematopoietic stem cell aging. Curr Opin Immunol 2014; 29:86-92. [PMID: 24905894 DOI: 10.1016/j.coi.2014.05.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 04/30/2014] [Accepted: 05/02/2014] [Indexed: 02/08/2023]
Abstract
Aging is organized in a hierarchy, in which aging of cells results in aged tissues, ultimately limiting lifespan. For organ systems that also in the adult depend on stem cells for tissue homeostasis like the hematopoietic system that forms immune cells, it is believed that aging of the stem cells strongly contributes to aging-associated dysfunction. In this review, we summarize current aspects on cellular and molecular mechanisms that are associated with aging of hematopoietic stem cells, the role of the stem cell niche for stem cell aging as well as novel and encouraging experimental approaches to attenuate aging of hematopoietic stem cells to target immunosenescence.
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Affiliation(s)
- Hartmut Geiger
- Institute for Molecular Medicine, Stem Cell and Aging, Ulm University, Ulm, Germany; Aging Research Center, Ulm University, Ulm, Germany; Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center and University of Cincinnati, Cincinnati, OH, USA.
| | - Michael Denkinger
- AGAPLESION Bethesda Clinic, Geriatric Center Ulm University, Ulm, Germany
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42
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Wang X, Zachman AL, Haglund NA, Maltais S, Sung HJ. Combined Usage of Stem Cells in End-Stage Heart Failure Therapies. J Cell Biochem 2014; 115:1217-24. [DOI: 10.1002/jcb.24782] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 02/03/2014] [Indexed: 01/14/2023]
Affiliation(s)
- Xintong Wang
- Department of Biomedical Engineering; Vanderbilt University; Nashville Tennessee
| | - Angela L. Zachman
- Department of Biomedical Engineering; Vanderbilt University; Nashville Tennessee
| | | | - Simon Maltais
- Division of Cardiovascular Surgery; Vanderbilt University; Nashville Tennessee
| | - Hak-Joon Sung
- Department of Biomedical Engineering; Vanderbilt University; Nashville Tennessee
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43
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Piccin D, Tufford A, Morshead CM. Neural stem and progenitor cells in the aged subependyma are activated by the young niche. Neurobiol Aging 2014; 35:1669-79. [PMID: 24559648 DOI: 10.1016/j.neurobiolaging.2014.01.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 01/09/2014] [Accepted: 01/23/2014] [Indexed: 11/25/2022]
Abstract
Previous studies have demonstrated an age related decline in the size of the neural stem cell (NSC) pool and a decrease in neural progenitor cell proliferation, however, the mechanisms underlying these changes are unclear. In contrast to previous reports, we report that the numbers of NSCs is unchanged in the old age subependyma and the apparent loss is because of reduced proliferative potential in the aged stem cell niche. Transplantation studies reveal that the proliferation kinetics and migratory behavior of neural precursor cells are dependent on the age of the host animal and independent of the age of the donor cells suggesting that young and old age neural precursors are not intrinsically different. Factors from the young stem cell niche rescue the numbers of NSC colonies derived from old age subependyma and enhance progenitor cell proliferation in vivo in old age mice. Finally, we report a loss of Wnt signaling in the old age stem cell niche that underlies the lack of expansion of the NSC pool after stroke.
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Affiliation(s)
- David Piccin
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario, Canada
| | - Adele Tufford
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Cindi M Morshead
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
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44
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Jeannet R, Cai Q, Liu H, Vu H, Kuo YH. Alcam regulates long-term hematopoietic stem cell engraftment and self-renewal. Stem Cells 2014; 31:560-71. [PMID: 23280653 DOI: 10.1002/stem.1309] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 11/26/2012] [Accepted: 11/27/2012] [Indexed: 12/29/2022]
Abstract
Hematopoietic stem cells (HSCs) reside in a specialized bone marrow (BM) microenvironment that supports the maintenance and functional integrity of long-term (LT)-HSCs throughout postnatal life. The objective of this work is to study the role of activated leukocyte cell adhesion molecule (Alcam) in HSC differentiation and self-renewal using an Alcam-null (Alcam(-/-) ) mouse model. We show here that Alcam is differentially regulated in adult hematopoiesis and is highly expressed in LT-HSCs where its level progressively increases with age. Young adult Alcam(-/-) mice had normal homeostatic hematopoiesis and normal numbers of phenotypic HSCs. However, Alcam(-/-) HSCs had reduced long-term replating capacity in vitro and reduced long-term engraftment potential upon transplantation. We show that Alcam(-/-) BM contain a markedly lower frequency of long-term repopulating cells than wild type. Further, the long-term repopulating potential and engraftment efficiency of Alcam(-/-) LT-HSCs was greatly compromised despite a progressive increase in phenotypic LT-HSC numbers during long-term serial transplantation. In addition, an age-associated increase in phenotypic LT-HSC cellularity was observed in Alcam(-/-) mice. This increase was predominately within the CD150(hi) fraction and was accompanied by significantly reduced leukocyte output. Consistent with an aging-like phenotype, older Alcam(-/-) LT-HSCs display myeloid-biased repopulation activity upon transplantation. Finally, Alcam(-/-) LT-HSCs display premature elevation of age-associated gene expression, including Selp, Clu, Cdc42, and Foxo3. Together, this study indicates that Alcam regulates functional integrity and self-renewal of LT-HSCs.
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Affiliation(s)
- Robin Jeannet
- Division of Hematopoietic Stem Cell and Leukemia Research, Department of Hematology and Hematopoietic Cell Transplantation, Beckman Research Institute of City of Hope, Duarte, California 91010, USA
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Abstract
PURPOSE OF REVIEW Hematopoietic stem cells (HSCs) continuously provide mature blood cells during the lifespan of a mammal. The functional decline in hematopoiesis in the elderly, which involves a progressive reduction in the immune response and an increased incidence of myeloid malignancy, is partly linked to HSC aging. Molecular mechanisms of HSC aging remain unclear, hindering rational approaches to slow or reverse the decline of HSC function with age. Identifying conditions under which aged HSCs become equivalent to young stem cells might result in treatments for age-associated imbalances in lymphopoiesis and myelopoiesis and in blood regeneration. RECENT FINDINGS Aging of HSCs has been for a long time thought to be an irreversible process imprinted in stem cells due to the intrinsic nature of HSC aging. Mouse model studies have found that aging is associated with elevated activity of the Rho GTPase Cdc42 in HSCs that is causative for loss of polarity, altered epigenetic modifications and functional deficits of aged HSCs. The work suggests that inhibition of Cdc42 activity in aged HSCs may reverse a number of phenotypes associated with HSC aging. SUMMARY Maintaining the regenerative capacity of organs or organ systems may be a useful way to ensure healthy aging. A defined set of features phenotypically separate young from aged HSCs. Aging of HSCs has been thought to be irreversible. Recent findings support the hypothesis that functional decline of aged HSCs may be reversible by pharmacological intervention of age altered signaling pathways and epigenetic modifications.
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A canonical to non-canonical Wnt signalling switch in haematopoietic stem-cell ageing. Nature 2013; 503:392-6. [PMID: 24141946 DOI: 10.1038/nature12631] [Citation(s) in RCA: 225] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2012] [Accepted: 09/03/2013] [Indexed: 02/06/2023]
Abstract
Many organs with a high cell turnover (for example, skin, intestine and blood) are composed of short-lived cells that require continuous replenishment by somatic stem cells. Ageing results in the inability of these tissues to maintain homeostasis and it is believed that somatic stem-cell ageing is one underlying cause of tissue attrition with age or age-related diseases. Ageing of haematopoietic stem cells (HSCs) is associated with impaired haematopoiesis in the elderly. Despite a large amount of data describing the decline of HSC function on ageing, the molecular mechanisms of this process remain largely unknown, which precludes rational approaches to attenuate stem-cell ageing. Here we report an unexpected shift from canonical to non-canonical Wnt signalling in mice due to elevated expression of Wnt5a in aged HSCs, which causes stem-cell ageing. Wnt5a treatment of young HSCs induces ageing-associated stem-cell apolarity, reduction of regenerative capacity and an ageing-like myeloid-lymphoid differentiation skewing via activation of the small Rho GTPase Cdc42. Conversely, Wnt5a haploinsufficiency attenuates HSC ageing, whereas stem-cell-intrinsic reduction of Wnt5a expression results in functionally rejuvenated aged HSCs. Our data demonstrate a critical role for stem-cell-intrinsic non-canonical Wnt5a signalling in HSC ageing.
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Martins PNA, Tullius SG, Markmann JF. Immunosenescence and immune response in organ transplantation. Int Rev Immunol 2013; 33:162-73. [PMID: 24127845 DOI: 10.3109/08830185.2013.829469] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The immune system undergoes a complex and continuous remodeling with aging. Immunosenescence results into both quantitative and qualitative changes of specific cellular subpopulations that have major impact on allorecognition and alloresponse, and consequently on graft rejection and tolerance. Here, we are going to review the immunological changes associated with the aging process relevant for transplantation. Interventions to selectively target changes associated with the senescence process seem promising therapeutic strategies to improve transplantation outcome.
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Affiliation(s)
- Paulo Ney Aguiar Martins
- Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School , Boston, MA , USA
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TXNIP maintains the hematopoietic cell pool by switching the function of p53 under oxidative stress. Cell Metab 2013; 18:75-85. [PMID: 23823478 DOI: 10.1016/j.cmet.2013.06.002] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 12/12/2012] [Accepted: 05/31/2013] [Indexed: 01/24/2023]
Abstract
Reactive oxygen species (ROS) are critical determinants of the fate of hematopoietic stem cells (HSCs) and hematopoiesis. Thioredoxin-interacting protein (TXNIP), which is induced by oxidative stress, is a known regulator of intracellular ROS. Txnip(-/-) old mice exhibited elevated ROS levels in hematopoietic cells and showed a reduction in hematopoietic cell population. Loss of TXNIP led to a dramatic reduction of mouse survival under oxidative stress. TXNIP directly regulated p53 protein by interfering with p53- mouse double minute 2 (MDM2) interactions and increasing p53 transcriptional activity. Txnip(-/-) mice showed downregulation of the antioxidant genes induced by p53. Introduction of TXNIP or p53 into Txnip(-/-) bone marrow cells rescued the HSC frequency and greatly increased survival in mice following oxidative stress. Overall, these data indicate that TXNIP is a regulator of p53 and plays a pivotal role in the maintenance of the hematopoietic cells by regulating intracellular ROS during oxidative stress.
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Heinbokel T, Elkhal A, Liu G, Edtinger K, Tullius SG. Immunosenescence and organ transplantation. Transplant Rev (Orlando) 2013; 27:65-75. [PMID: 23639337 PMCID: PMC3718545 DOI: 10.1016/j.trre.2013.03.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2012] [Revised: 12/17/2012] [Accepted: 03/19/2013] [Indexed: 12/22/2022]
Abstract
Increasing numbers of elderly transplant recipients and a growing demand for organs from older donors impose pressing challenges on transplantation medicine. Continuous and complex modifications of the immune system in parallel to aging have a major impact on transplant outcome and organ quality. Both, altered alloimmune responses and increased immunogenicity of organs present risk factors for inferior patient and graft survival. Moreover, a growing body of knowledge on age-dependent modifications of allorecognition and alloimmune responses may require age-adapted immunosuppression and organ allocation. Here, we summarize relevant aspects of immunosenescence and their possible clinical impact on organ transplantation.
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Affiliation(s)
- Timm Heinbokel
- Division of Transplant Surgery and Transplant Surgery Research Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
- Institute of Medical Immunology, Charité – Universitätsmedizin Berlin, Berlin, Germany
| | - Abdallah Elkhal
- Division of Transplant Surgery and Transplant Surgery Research Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - Guangxiang Liu
- Division of Transplant Surgery and Transplant Surgery Research Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - Karoline Edtinger
- Division of Transplant Surgery and Transplant Surgery Research Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - Stefan G. Tullius
- Division of Transplant Surgery and Transplant Surgery Research Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
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Exhaustion of nucleus pulposus progenitor cells with ageing and degeneration of the intervertebral disc. Nat Commun 2013; 3:1264. [PMID: 23232394 PMCID: PMC3535337 DOI: 10.1038/ncomms2226] [Citation(s) in RCA: 320] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 10/25/2012] [Indexed: 02/07/2023] Open
Abstract
Despite the high prevalence of intervertebral disc disease, little is known about changes in intervertebral disc cells and their regenerative potential with ageing and intervertebral disc degeneration. Here we identify populations of progenitor cells that are Tie2 positive (Tie2+) and disialoganglioside 2 positive (GD2+), in the nucleus pulposus from mice and humans. These cells form spheroid colonies that express type II collagen and aggrecan. They are clonally multipotent and differentiated into mesenchymal lineages and induced reorganization of nucleus pulposus tissue when transplanted into non-obese diabetic/severe combined immunodeficient mice. The frequency of Tie2+ cells in tissues from patients decreases markedly with age and degeneration of the intervertebral disc, suggesting exhaustion of their capacity for regeneration. However, progenitor cells (Tie2+GD2+) can be induced from their precursor cells (Tie2+GD2−) under simple culture conditions. Moreover, angiopoietin-1, a ligand of Tie2, is crucial for the survival of nucleus pulposus cells. Our results offer insights for regenerative therapy and a new diagnostic standard. Back pain and sciatica are often caused by intervertebral disc degeneration. Sakai and colleagues identify a subset of nucleus pulposus progenitor cells from the intervertebral disc and show that loss of these progenitor cells correlates with ageing and intervertebral disc degeneration.
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