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Thiyagarajan R, Gonzalez MR, Zaw C, Seldeen KL, Hernandez M, Pang M, Troen BR. SRT2183 and SRT1720, but not Resveratrol, Inhibit Osteoclast Formation and Resorption in the Presence or Absence of Sirt1. J Bone Res 2023; 11:1000235. [PMID: 37711761 PMCID: PMC10500633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
Background Osteoclastic bone resorption markedly increases with aging, leading to osteoporosis characterized by weak and fragile bones. Mice exhibit greater bone resorption and poor bone mass when Sirt1 is removed from their osteoclasts. Here we investigated the ex vivo impacts of putative Sirt1 activators, Resveratrol (RSV), SRT2183, and SRT1720, on osteoclast formation and activity in primary mouse bone marrow cells (BMCs) derived from wild-type (WT) and osteoclast specific Sirt1 knockout (OC-Sirt1KO) mice and in the RAW264.7 mouse macrophage cell line. Results We found that SRT2183 and SRT1720 inhibit the formation of osteoclasts and actin belts in BMCs and RAW264.7 cells, whereas RSV does not. We also observed that the OC-Sirt1KO mice exhibited less bone mineral density, and the BMCs harvested from these mice yielded more osteoclasts than BMCs harvested from littermate controls. Interestingly, both SRT2183 and SRT1720 reduced osteoclast and actin belt formation in BMCs from OC-Sirt1KO mice. SRT2183 and SRT1720 also significantly disrupted actin belts of mature osteoclasts generated from BMCs of WT mice, within 3 and 6 hours of administration, respectively. Furthermore, these compounds inhibited the resorption activity of mature osteoclasts, while RSV did not. Conclusion Our findings suggest SRT2183 and SRT1720 impede bone resorption by disrupting actin belts of mature osteoclasts, inhibit actin belt formation, and inhibit osteoclastogenesis even in the absence of Sirt1. Thus, the mechanism of action of these compounds appears to extend beyond Sirt1 activation and possibly pave the way for potential new therapies in alleviating osteoporosis associated bone loss.
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Affiliation(s)
- Ramkumar Thiyagarajan
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Maria Rodríguez Gonzalez
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Catherine Zaw
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Kenneth Ladd Seldeen
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Mireya Hernandez
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Manhui Pang
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
| | - Bruce Robert Troen
- Division of Geriatrics, Department of Internal Medicine, Landon Center on Aging, Kansas University Medical Center, KS and Research Service, Veterans Affairs Kansas City Healthcare System, Kansas City, Missouri, USA
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Seldeen KL, Shahini A, Thiyagarajan R, Redae Y, Leiker M, Rajabian N, Dynka A, Andreadis ST, Troen BR. Short-term nicotinamide riboside treatment improves muscle quality and function in mice and increases cellular energetics and differentiating capacity of myogenic progenitors. Nutrition 2021; 87-88:111189. [PMID: 33744645 DOI: 10.1016/j.nut.2021.111189] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 01/29/2023]
Abstract
OBJECTIVES Nicotinamide adenine dinucleotide (NAD+), an essential cofactor for mitochondrial function, declines with aging, which may lead to impaired physical performance. Nicotinamide riboside (NR), a NAD+ precursor, restores cellular NAD+ levels. The aim of this study was to examine the effects of short-term NR supplementation on physical performance in middle-aged mice and the effects on mouse and human muscle stem cells. METHODS We treated 15-mo-old male C57BL/6J mice with NR at 300 mg·kg·d-1 (NR3), 600 mg·kg·d-1 (NR6), or placebo (PLB), n = 8 per group, and assessed changes in physical performance, muscle histology, and NAD+ content after 4 wk of treatment. RESULTS NR increased total NAD+ in muscle tissue (NR3 P = 0.01; NR6 P = 0.004, both versus PLB), enhanced treadmill endurance and open-field activity, and prevented decline in grip strength. Histologic analysis revealed NR-treated mice exhibited enlarged slow-twitch fibers (NR6 versus PLB P = 0.014; NR3 P = 0.16) and a trend toward more slow fibers (NR3 P = 0.14; NR6 P = 0.22). We next carried out experiments to characterize NR effects on mitochondrial activity and cellular energetics in vitro. We observed that NR boosted basal and maximal cellular aerobic and anaerobic respiration in both mouse and human myoblasts and human myotubes. Additionally, NR treatment improved the differentiating capacity of myoblasts and increased myotube size and fusion index upon stimulation of these progenitors to form multinucleated myotubes. CONCLUSION These findings support a role for NR in improving cellular energetics and functional capacity in mice, which support the translation of this work into clinical settings as a strategy for improving and/or maintaining health span during aging.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States
| | - Aref Shahini
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, United States
| | - Ramkumar Thiyagarajan
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States
| | - Yonas Redae
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States
| | - Merced Leiker
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States
| | - Nika Rajabian
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, United States
| | - Andrew Dynka
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States
| | - Stelios T Andreadis
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, United States
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, United States.
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Seldeen KL, Berman RN, Pang M, Lasky G, Weiss C, MacDonald BA, Thiyagarajan R, Redae Y, Troen BR. Vitamin D Insufficiency Reduces Grip Strength, Grip Endurance and Increases Frailty in Aged C57Bl/6J Mice. Nutrients 2020; 12:nu12103005. [PMID: 33007912 PMCID: PMC7599884 DOI: 10.3390/nu12103005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 09/21/2020] [Accepted: 09/28/2020] [Indexed: 12/14/2022] Open
Abstract
Low 25-OH serum vitamin D (VitD) is pervasive in older adults and linked to functional decline and progression of frailty. We have previously shown that chronic VitD insufficiency in "middle-aged" mice results in impaired anaerobic exercise capacity, decreased lean mass, and increased adiposity. Here, we examine if VitD insufficiency results in similar deficits and greater frailty progression in old-aged (24 to 28 months of age) mice. Similar to what we report in younger mice, older mice exhibit a rapid and sustained response in serum 25-OH VitD levels to differential supplementation, including insufficient (125 IU/kg chow), sufficient (1000 IU/kg chow), and hypersufficient (8000 IU/kg chow) groups. During the 4-month time course, mice were assessed for body composition (DEXA), physical performance, and frailty using a Fried physical phenotype-based assessment tool. The 125 IU mice exhibited worse grip strength (p = 0.002) and inverted grip hang time (p = 0.003) at endpoint and the 8000 IU mice transiently displayed greater rotarod performance after 3 months (p = 0.012), yet other aspects including treadmill performance and gait speed were unaffected. However, 125 and 1000 IU mice exhibited greater frailty compared to baseline (p = 0.001 and p = 0.038, respectively), whereas 8000 IU mice did not (p = 0.341). These data indicate targeting higher serum 25-OH vitamin D levels may attenuate frailty progression during aging.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Reem Nagi Berman
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Manhui Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Ginger Lasky
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Carleara Weiss
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Brian Alexander MacDonald
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Ramkumar Thiyagarajan
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Yonas Redae
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Buffalo, NY 14203, USA; (K.L.S.); (R.N.B.); (M.P.); (G.L.); (C.W.); (B.A.M.); (R.T.); (Y.R.)
- Veterans Affairs Western New York Healthcare System, Buffalo, NY 14215, USA
- Correspondence:
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Seldeen KL, Redae YZ, Thiyagarajan R, Berman RN, Leiker MM, Troen BR. High intensity interval training improves physical performance in aged female mice: A comparison of mouse frailty assessment tools. Mech Ageing Dev 2019; 180:49-62. [PMID: 30951786 PMCID: PMC9841971 DOI: 10.1016/j.mad.2019.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/22/2019] [Accepted: 04/01/2019] [Indexed: 01/19/2023]
Abstract
Frailty syndrome increases the risk for disability and mortality, and is a major health concern amidst the geriatric shift in the population. High intensity interval training (HIIT), which couples bursts of vigorous activity interspersed with active recovery intervals, shows promise for the treatment of frailty. Here we compare and contrast five Fried physical phenotype and one deficit accumulation based mouse frailty assessment tools for identifying the impacts of HIIT on frailty and predicting functional capacity, underlying pathology, and survival in aged female mice. Our data reveal a 10-minute HIIT regimen administered 3-days-a-week for 8-weeks increased treadmill endurance, gait speed and maintained grip strength. One frailty tool identified a benefit of HIIT for frailty, but many were trending suggesting HIIT was beneficial for physical performance in these mice, but the 8-week timeframe may have been insufficient to induce frailty benefits. Finally, most frailty tools distinguished between surviving or non-surviving mice, whereas half correlated with functional capacity measured by nest building ability, and none correlated with underlying pathology. In summary, this study supports the ongoing development of mouse assessment tools as useful instruments for frailty research.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Corresponding author at: 875 Ellicott Street, CTRC Room 8030A, Buffalo, NY 14203, USA. (K.L. Seldeen)
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Pang M, Rodríguez-Gonzalez M, Hernandez M, Recinos CC, Seldeen KL, Troen BR. AP-1 and Mitf interact with NFATc1 to stimulate cathepsin K promoter activity in osteoclast precursors. J Cell Biochem 2019; 120:12382-12392. [PMID: 30816596 DOI: 10.1002/jcb.28504] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 12/12/2018] [Accepted: 12/14/2018] [Indexed: 11/08/2022]
Abstract
Cathepsin K (CTSK) is a secreted protease that plays an essential role in osteoclastic bone resorption and osteoporotic bone loss. We have previously shown that activator protein 1 (AP-1) stimulates CTSK promoter activity and that proximal nuclear factor of activated T cells cytoplasmic 1 (NFATc1)-binding sites play a major role in the stimulation of CTSK gene expression by receptor activator of NFκB ligand (RANKL). In the present study, we have extended these observations and further dissected the effects of transcription factors involved in the regulation of CTSK gene expression. Our aim was to investigate the cooperative interplay among transcription factors AP-1, microphthalmia-associated transcription factor (Mitf), and NFATc1, and the consequent regulatory effects on CTSK transcription. Experiments were carried out in RAW 264.7 cells, which can be readily differentiated to osteoclasts upon RANKL stimulation. Our data show that AP-1, Mitf, and NFATc1 are capable of independently stimulating CTSK promoter activity. A combination of any two factors further enhances CTSK promoter activity, with the combination of AP-1 (c-fos/c-jun) and NFATc1 inducing the largest increase. We further identify a synergistic effect when all three factors cooperate intimately at the proximal promoter region, yielding maximal transcriptional upregulation of the CTSK promoter. RANKL induces temporal localization of AP-1 and NFATc1 to the CTSK promoter. These results suggest that the interaction of multiple transcription factors mediate a maximal response to RANKL-induced CTSK gene expression.
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Affiliation(s)
- Manhui Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Maria Rodríguez-Gonzalez
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Mireya Hernandez
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Claudia Carolina Recinos
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
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Seldeen KL, Redae YZ, Thiyagarajan R, Berman RN, Leiker MM, Troen BR. Short Session High Intensity Interval Training and Treadmill Assessment in Aged Mice. J Vis Exp 2019:10.3791/59138. [PMID: 30774134 PMCID: PMC9897322 DOI: 10.3791/59138] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
High intensity interval training (HIIT) is emerging as a therapeutic approach to prevent, delay, or ameliorate frailty. In particular short session HIIT, with regimens less than or equal to 10 min is of particular interest as several human studies feature routines as short as a few minutes a couple times a week. However, there is a paucity of animal studies that model the impacts of short session HIIT. Here, we describe a methodology for an individually tailored and progressive short session HIIT regimen of 10 min given 3 days a week for aged mice using an inclined treadmill. Our methodology also includes protocols for treadmill assessment. Mice are initially acclimatized to the treadmill and then given baseline flat and uphill treadmill assessments. Exercise sessions begin with a 3 min warm-up, then three intervals of 1 min at a fast pace, followed by 1 min at an active recovery pace. Following these intervals, the mice are given a final segment that starts at the fast pace and accelerates for 1 min. The HIIT protocol is individually tailored as the speed and intensity for each mouse are determined based upon initial anaerobic assessment scores. Additionally, we detail the conditions for increasing or decreasing the intensity for individual mice depending on performance. Finally, intensity is increased for all mice every two weeks. We previously reported in this protocol enhanced physical performance in aged male mice and here show it also increases treadmill performance in aged female mice. Advantages of our protocol include low administration time (about 15 min per 6 mice, 3 days a week), strategy for individualizing for mice to better model prescribed exercise, and a modular design that allows for the addition or removal of the number and length of intervals to titrate exercise benefits.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Yonas Z. Redae
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Ramkumar Thiyagarajan
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Reem Nagi Berman
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Merced Marie Leiker
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
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Seldeen KL, Lasky G, Leiker MM, Pang M, Personius KE, Troen BR. High Intensity Interval Training Improves Physical Performance and Frailty in Aged Mice. J Gerontol A Biol Sci Med Sci 2018; 73:429-437. [PMID: 28633487 DOI: 10.1093/gerona/glx120] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 06/16/2017] [Indexed: 10/08/2023] Open
Abstract
Sarcopenia and frailty are highly prevalent in older individuals, increasing the risk of disability and loss of independence. High intensity interval training (HIIT) may provide a robust intervention for both sarcopenia and frailty by achieving both strength and endurance benefits with lower time commitments than other exercise regimens. To better understand the impacts of HIIT during aging, we compared 24-month-old C57BL/6J sedentary mice with those that were administered 10-minute uphill treadmill HIIT sessions three times per week over 16 weeks. Baseline and end point assessments included body composition, physical performance, and frailty based on criteria from the Fried physical frailty scale. HIIT-trained mice demonstrated dramatic improvement in grip strength (HIIT 10.9% vs -3.9% in sedentary mice), treadmill endurance (32.6% vs -2.0%), and gait speed (107.0% vs 39.0%). Muscles from HIIT mice also exhibited greater mass, larger fiber size, and an increase in mitochondrial biomass. Furthermore, HIIT exercise led to a dramatic reduction in frailty scores in five of six mice that were frail or prefrail at baseline, with four ultimately becoming nonfrail. The uphill treadmill HIIT exercise sessions were well tolerated by aged mice and led to performance gains, improvement in underlying muscle physiology, and reduction in frailty.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Ginger Lasky
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Merced Marie Leiker
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Manhui Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Kirkwood Ely Personius
- Department of Rehabilitation Science, School of Public Health and Health Professionals, University at Buffalo, New York
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
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Seldeen KL, Halley PG, Volmar CH, Rodríguez MA, Hernandez M, Pang M, Carlsson SK, Suva LJ, Wahlestedt C, Troen BR, Brothers SP. Neuropeptide Y Y2 antagonist treated ovariectomized mice exhibit greater bone mineral density. Neuropeptides 2018; 67:45-55. [PMID: 29129406 PMCID: PMC5805636 DOI: 10.1016/j.npep.2017.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 11/06/2017] [Accepted: 11/06/2017] [Indexed: 12/15/2022]
Abstract
Osteoporosis, a disease characterized by progressive bone loss and increased risk of fracture, often results from menopausal loss of estrogen in women. Neuropeptide Y has been shown to negatively regulate bone formation, with amygdala specific deletion of the Y2 receptor resulting in increased bone mass in mice. In this study, ovariectomized (OVX) mice were injected once daily with JNJ-31020028, a brain penetrant Y2 receptor small molecule antagonist to determine the effects on bone formation. Antagonist treated mice had reduced weight and showed increased whole-body bone mineral density compared to vehicle-injected mice. Micro computerized tomography (micro-CT) demonstrated increased vertebral trabecular bone volume, connectivity density and trabecular thickness. Femoral micro-CT analysis revealed increased bone volume within trabecular regions and greater trabecular number, without significant difference in other parameters or within cortical regions. A decrease was seen in serum P1NP, a measure used to confirm positive treatment outcomes in bisphosphonate treated patients. C-terminal telopeptide 1 (CTX-1), a blood biomarker of bone resorption, was decreased in treated animals. The higher bone mineral density observed following Y2 antagonist treatment, as determined by whole-body DEXA scanning, is indicative of either enhanced mineralization or reduced bone loss. Additionally, our findings that ex vivo treatment of bone marrow cells with the Y2 antagonist did not affect osteoblast and osteoclast formation suggests the inhibitor is not affecting these cells directly, and suggests a central role for compound action in this system. Our results support the involvement of Y2R signalling in bone metabolism and give credence to the hypothesis that selective pharmacological manipulation of Y2R may provide anabolic benefits for treating osteoporosis.
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Affiliation(s)
- K L Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, USA
| | - P G Halley
- Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA
| | - C H Volmar
- Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA
| | - M A Rodríguez
- Bruce W. Carter VA Geriatric Research Education and Clinical Center (GRECC), Miami, FL, USA; University of Miami Miller School of Medicine, Miami, FL, USA
| | - M Hernandez
- Bruce W. Carter VA Geriatric Research Education and Clinical Center (GRECC), Miami, FL, USA; University of Miami Miller School of Medicine, Miami, FL, USA
| | - M Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, USA
| | - S K Carlsson
- Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA
| | - L J Suva
- Department of Orthopaedic Surgery, Centre for Orthopaedic Research, University of Arkansas Medical School, Little Rock, AR, USA
| | - C Wahlestedt
- Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA
| | - B R Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Research Service, Veterans Affairs Western New York Healthcare System, Buffalo, NY, USA
| | - S P Brothers
- Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA.
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Abstract
Frailty is highly prevalent in the elderly, increasing the risk of poor outcomes that include falls, incident disability, hospitalization, and mortality. Thus, a great need exists to characterize the underlying mechanisms and ultimately identify strategies that prevent, delay, and even reverse frailty. Mouse models can provide insight into molecular mechanisms of frailty by reducing variability in lifestyle and genetic factors that can complicate interpretation of human clinical data. Frailty, generally recognized as a syndrome involving reduced homeostatic reserve in response to physiologic challenges and increasing susceptibility to poor health outcomes, is predominantly assessed using two independent strategies, integrated phenotype and deficit accumulation. The integrated phenotype defines frailty by the presentation of factors affecting functional capacity such as weight loss, exhaustion, low activity levels, slow gait, and grip strength. The deficit accumulation paradigm draws parameters from a greater range of physiological systems, such as the ability to perform daily activities, coordination and gait, mental components, physiological problems, and history and presence of medical morbidities. This strategic division also applies within the emerging field of mouse frailty models, with both methodologies showing usefulness in providing insight into physiologic mechanisms and testing interventions. Our review will explore the strategies used, caveats in methodology, and future directions in the application of animal models for the study of the frailty syndrome.
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Affiliation(s)
- K L Seldeen
- Division of Geriatrics and Palliative Medicine, University at Buffalo - SUNY, Research Service, Western New York Veterans Affairs Healthcare Service, 875 Ellicott Street, Buffalo, NY, 14203, USA
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