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Kerr NR, Kelty TJ, Mao X, Childs TE, Kline DD, Rector RS, Booth FW. Selective breeding for physical inactivity produces cognitive deficits via altered hippocampal mitochondrial and synaptic function. Front Aging Neurosci 2023; 15:1147420. [PMID: 37077501 PMCID: PMC10106691 DOI: 10.3389/fnagi.2023.1147420] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 01/18/2023] [Accepted: 03/14/2023] [Indexed: 04/05/2023] Open
Abstract
Physical inactivity is the 4th leading cause of death globally and has been shown to significantly increase the risk for developing Alzheimer's Disease (AD). Recent work has demonstrated that exercise prior to breeding produces heritable benefits to the brains of offspring, suggesting that the physical activity status of previous generations could play an important role in one's brain health and their subsequent risk for neurodegenerative diseases. Thus, our study aimed to test the hypothesis that selective breeding for physical inactivity, or for high physical activity, preference produces heritable deficits and enhancements to brain health, respectively. To evaluate this hypothesis, male and female sedentary Low Voluntary Runners (LVR), wild type (WT), and High Voluntary Runner (HVR) rats underwent cognitive behavioral testing, analysis of hippocampal neurogenesis and mitochondrial respiration, and molecular analysis of the dentate gyrus. These analyses revealed that selecting for physical inactivity preference has produced major detriments to cognition, brain mitochondrial respiration, and neurogenesis in female LVR while female HVR display enhancements in brain glucose metabolism and hippocampal size. On the contrary, male LVR and HVR showed very few differences in these parameters relative to WT. Overall, we provide evidence that selective breeding for physical inactivity has a heritable and detrimental effect on brain health and that the female brain appears to be more susceptible to these effects. This emphasizes the importance of remaining physically active as chronic intergenerational physical inactivity likely increases susceptibility to neurodegenerative diseases for both the inactive individual and their offspring.
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Affiliation(s)
- Nathan R. Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Taylor J. Kelty
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, United States
| | - Xuansong Mao
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Thomas E. Childs
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - David D. Kline
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, United States
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO, United States
| | - R. Scott Rector
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, United States
- Research Service, Harry S. Truman Memorial Veterans Hospital, University of Missouri, Columbia, MO, United States
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Missouri, Columbia, MO, United States
| | - Frank W. Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, United States
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, United States
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO, United States
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Mao X, Grigsby KB, Kelty TJ, Kerr NR, Childs TE, Booth FW. Transcriptomic analysis reveals novel molecular signaling networks involved in low voluntary running behavior after AP-1 inhibition. Neuroscience 2023; 509:173-186. [PMID: 36395916 DOI: 10.1016/j.neuroscience.2022.11.008] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 11/06/2022] [Accepted: 11/08/2022] [Indexed: 11/16/2022]
Abstract
Understanding the neuro-molecular mechanisms that mediate the quantity of daily physical activity (PA) level is of medical significance, given the tremendous health benefits associated with greater physical activity. Here, we examined the effects of intra-nucleus accumbens (NAc) inhibition of activator protein-1 (AP-1), an important transcriptional factor downstream of cAMP response element binding protein (CREB; a reward-related transcriptional regulator), on voluntary wheel running behavior in wild-type (WT) and low voluntary running (LVR) female rats. Transcriptome analysis of the nucleus accumbens (NAc; a brain region critical for PA reward and motivation) was performed to further determine molecular responses to intra-NAc AP-1 inhibition in these rat lines. Within WT rats, intra-NAc AP-1 inhibition caused a significant decrease in overnight running distance in comparison to control rats (p = 0.009). Transcriptomic and bioinformatic analysis in WT rats identified involvement of gene products that regulate cellular proliferation and development, which were cellular processes regulated by AP-1. In contrast to above decreased WT distances, intra-NAc AP-1 inhibition in LVR rats increased nightly running distance in comparison to LVR control rats (p = 0.0008). Further analysis identified gene products that are associated with regulating intracellular Ca2+ homeostasis, calcium ion binding and neuronal excitability. In short, our study aims to gain a comprehensive understanding of transcriptional profile that was due to AP-1 inhibition in NAc, in which it could not only enhance the knowledge regarding molecular regulatory loops within NAc for modulating voluntary running behavior, but also provide further insights into molecular targets for future investigations.
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Affiliation(s)
- Xuansong Mao
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA
| | - Kolter B Grigsby
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA
| | - Taylor J Kelty
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA
| | - Nathan R Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA
| | - Thomas E Childs
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA
| | - Frank W Booth
- Department of Biomedical Sciences, University of Missouri, Columbia 65211, MO, USA; Department of Nutrition and Exercise Physiology, University of Missouri, Columbia 65211, MO, USA; Department of Medical Pharmacology and Physiology, University of Missouri, Columbia 65211, MO, USA; Dalton Cardiovascular Research Center, University of Missouri, Columbia 65211, MO, USA.
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Grigsby KB, Kerr NR, Kelty TJ, Mao X, Childs TE, Booth FW. Acute Wheel-Running Increases Markers of Stress and Aversion-Related Signaling in the Basolateral Amygdala of Male Rats. J Funct Morphol Kinesiol 2022; 8:jfmk8010006. [PMID: 36648898 PMCID: PMC9844436 DOI: 10.3390/jfmk8010006] [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] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/18/2022] [Accepted: 12/23/2022] [Indexed: 01/04/2023] Open
Abstract
Physical activity (PA) is a non-invasive, cost-effective means of reducing chronic disease. Most US citizens fail to meet PA guidelines, and individuals experiencing chronic stress are less likely to be physically active. To better understand the barriers to maintaining active lifestyles, we sought to determine the extent to which short- versus long-term PA increases stress- and aversion-related markers in wild-type (WT) and low voluntary running (LVR) rats, a unique genetic model of low physical activity motivation. Here, we tested the effects of 1 and 4 weeks of voluntary wheel-running on physiological, behavioral, and molecular measures of stress and Hypothalamic Pituitary Adrenal (HPA)-axis responsiveness (corticosterone levels, adrenal wet weights, and fecal boli counts). We further determined measures of aversion-related signaling (kappa opioid receptor, dynorphin, and corticotropin releasing hormone mRNA expression) in the basolateral amygdala (BLA), a brain region well characterized for its role in anxiety and aversion. Compared to sedentary values, 1, but not 4 weeks of voluntary wheel-running increased adrenal wet weights and plasma corticosterone levels, suggesting that HPA responsiveness normalizes following long-term PA. BLA mRNA expression of prodynorphin (Pdyn) was significantly elevated in WT and LVR rats following 1 week of wheel-running compared to sedentary levels, suggesting that aversion-related signaling is elevated following short- but not long-term wheel-running. In all, it appears that the stress effects of acute PA may increase molecular markers associated with aversion in the BLA, and that LVR rats may be more sensitive to these effects, providing a potential neural mechanism for their low PA motivation.
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Affiliation(s)
- Kolter B. Grigsby
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
- Department of Behavioral Neuroscience, Oregon Health & Science University, and VA Portland Health Care System, Portland, OR 97239, USA
- Correspondence: (K.B.G.); (N.R.K.)
| | - Nathan R. Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
- Correspondence: (K.B.G.); (N.R.K.)
| | - Taylor J. Kelty
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Xuansong Mao
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Thomas E. Childs
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Frank W. Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO 65211, USA
- Department of Physiology, University of Missouri, Columbia, MO 65211, USA
- Dalton Cardiovascular Center, University of Missouri, Columbia, MO 65211, USA
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Kerr NR, Booth FW. Contributions of physical inactivity and sedentary behavior to metabolic and endocrine diseases. Trends Endocrinol Metab 2022; 33:817-827. [PMID: 36283907 DOI: 10.1016/j.tem.2022.09.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 09/29/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022]
Abstract
Physical inactivity is the fourth leading global cause of death and is a major contributor to metabolic and endocrine diseases. In this review we provide a current update of the past 5 years in the field as it pertains to the most prevalent and deadly chronic diseases. Despite the prevalence of physical inactivity in modern society, it remains largely overlooked relative to other comparable risk factors such as obesity, and our molecular understanding of how physical inactivity impacts metabolism is still partially unknown. Therefore, we discuss current clinical inactivity models along with their most recent findings regarding health outcomes along with any discrepancies that are present in the field. Lastly, we discuss future directions and the need for translatable animal models of physical inactivity to discover novel molecular targets for the prevention of chronic disease.
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Affiliation(s)
- Nathan R Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Frank W Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA; Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO 65211, USA; Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65211, USA; Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA.
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Kelty TJ, Mao X, Kerr NR, Childs TE, Ruegsegger GN, Booth FW. Resistance-exercise training attenuates LPS-induced astrocyte remodeling and neuroinflammatory cytokine expression in female Wistar rats. J Appl Physiol (1985) 2021; 132:317-326. [PMID: 34941437 DOI: 10.1152/japplphysiol.00571.2021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Neuroinflammation is an early detectable marker of mild cognitive impairment, the transition state between normal cognition and dementia. Resistance-exercise training can attenuate the cognitive decline observed in patients with mild cognitive impairment. However, the underlying mechanisms of resistance training effects are largely unknown. To further elucidate mechanisms of the known cognitive health benefits from resistance-exercise training, we tested if three weeks of resistance-exercise training could ameliorate lipopolysaccharide-induced neuroinflammation. Five-week-old female Wistar rats received intracerebroventricular injections of lipopolysaccharides to induce neuroinflammation and cognitive impairment. Rats then underwent three weeks of progressive ladder climbing to recapitulate resistance-exercise training in humans. Cognition was assessed towards the end of the training period by novelty object recognition testing. Neuroinflammation was measured one and 24-hours after the last resistance-exercise training workout. Resistance-exercise training ameliorated cognitive impairment, diminished lipopolysaccharide-induced neuroinflammatory cytokine expression, and attenuated astrocyte remodeling in the dentate gyrus 24-hours post exercise. Here, we provide evidence that the ladder-climbing model of resistance-exercise training in rats can improve cognition as early as three weeks. Additionally, these data support the hypothesis that resistance exercise can reduce lipopolysaccharide-induced neuroinflammation in the dentate gyrus.
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Affiliation(s)
- Taylor J Kelty
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Xuansong Mao
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Nathan R Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Thomas E Childs
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Gregory N Ruegsegger
- Department of Health and Human Performance, University of Wisconsin-River Falls, River Falls, WI, United States
| | - Frank W Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States.,Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, United States.,Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, United States.,Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO, United States
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Kelty TJ, Brown JD, Kerr NR, Roberts MD, Childs TE, Cabrera OH, Manzella FM, Miller DK, Taylor GT, Booth FW. RNA-sequencing and behavioral testing reveals inherited physical inactivity co-selects for anxiogenic behavior without altering depressive-like behavior in Wistar rats. Neurosci Lett 2021; 753:135854. [PMID: 33785378 DOI: 10.1016/j.neulet.2021.135854] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 03/22/2021] [Accepted: 03/24/2021] [Indexed: 11/15/2022]
Abstract
Physical inactivity is positively associated with anxiety and depression. Considering physical inactivity, anxiety, and depression each have a genetic basis for inheritance, our lab used artificial selectively bred low-voluntary running (LVR) and wild type (WT) female Wistar rats to test if physical inactivity genes selected over multiple generations would lead to an anxiety or depressive-like phenotype. We performed next generation RNA sequencing and immunoblotting on the dentate gyrus to reveal key biological functions from heritable physical inactivity. LVR rats did not display depressive-like behavior. However, LVR rats did display anxiogenic behavior with gene networks associated with reduced neuronal development, proliferation, and function compared to WT counterparts. Additionally, immunoblotting revealed LVR deficits in neuronal development and function. To our knowledge, this is the first study to show that by selectively breeding for physical inactivity genes, anxiety-like genes were co-selected. The study also reveals molecular insights to the genetic influences that physical inactivity has on anxiety-like behavior.
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Affiliation(s)
- Taylor J Kelty
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA.
| | - Jacob D Brown
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65211, USA
| | - Nathan R Kerr
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Michael D Roberts
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Tom E Childs
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Omar H Cabrera
- Department of Psychological Sciences, University of Missouri-St. Louis, St. Louis, MO 63110, USA
| | - Francesca M Manzella
- Department of Psychological Sciences, University of Missouri-St. Louis, St. Louis, MO 63110, USA
| | - Dennis K Miller
- Department of Psychological Sciences, University of Missouri, Columbia, MO 65211, USA
| | - George T Taylor
- Department of Psychological Sciences, University of Missouri-St. Louis, St. Louis, MO 63110, USA
| | - Frank W Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA; Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO 65211, USA; Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65211, USA; Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
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