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Lee E, Nissinen TA, Ylä-Outinen L, Jalkanen A, Karppinen JE, Vieira-Potter VJ, Lipponen A, Karvinen S. Estrogen deficiency reduces maximal running capacity and affects serotonin levels differently in the hippocampus and nucleus accumbens in response to acute exercise. Front Neurosci 2024; 18:1399229. [PMID: 38983274 PMCID: PMC11231437 DOI: 10.3389/fnins.2024.1399229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 06/07/2024] [Indexed: 07/11/2024] Open
Abstract
Introduction Estrogen deficiency is associated with unfavorable changes in body composition and metabolic health. While physical activity ameliorates several of the negative effects, loss of ovarian function is associated with decreased physical activity levels. It has been proposed that the changes in brain neurochemical levels and /or impaired skeletal muscle function may underlie this phenomenon. Methods We studied the effect of estrogen deficiency induced via ovariectomy (OVX) in female Wistar rats (n = 64). Rats underwent either sham or OVX surgery and were allocated thereafter into four groups matched for body mass and maximal running capacity: sham/control, sham/max, OVX/control, and OVX/max, of which the max groups had maximal running test before euthanasia to induce acute response to exercise. Metabolism, spontaneous activity, and maximal running capacity were measured before (PRE) and after (POST) the surgeries. Three months following the surgery, rats were euthanized, and blood and tissue samples harvested. Proteins were analyzed from gastrocnemius muscle and retroperitoneal adipose tissue via Western blot. Brain neurochemical markers were measured from nucleus accumbens (NA) and hippocampus (HC) using ultra-high performance liquid chromatography. Results OVX had lower basal energy expenditure and higher body mass and retroperitoneal adipose tissue mass compared with sham group (p ≤ 0.005). OVX reduced maximal running capacity by 17% (p = 0.005) with no changes in muscle mass or phosphorylated form of regulatory light chain (pRLC) in gastrocnemius muscle. OVX was associated with lower serotonin metabolite 5-hydroxyindoleacetic acid (5-HIAA) level in the NA compared with sham (p = 0.007). In response to acute exercise, OVX was associated with low serotonin level in the HC and high level in the NA (p ≤ 0.024). Discussion Our results highlight that OVX reduces maximal running capacity and affects the response of brain neurochemical levels to acute exercise in a brain region-specific manner. These results may offer mechanistic insight into why OVX reduces willingness to exercise.
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Affiliation(s)
- Earric Lee
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Montreal Heart Institute, Montréal, QC, Canada
- School of Kinesiology and Physical Activity Sciences, University of Montréal, Montréal, QC, Canada
| | - Tuuli A. Nissinen
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
| | - Laura Ylä-Outinen
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
| | - Aaro Jalkanen
- Faculty of Health Sciences, School of Pharmacy, University of Eastern Finland, Kuopio, Finland
| | - Jari E. Karppinen
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Obesity Research Unit, Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Victoria Jeanne Vieira-Potter
- Division of Foods, Nutrition and Exercise Sciences, Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, United States
| | - Arto Lipponen
- Department of Psychology, Faculty of Education and Psychology, University of Jyväskylä, Jyväskylä, Finland
| | - Sira Karvinen
- Gerontology Research Center and Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
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De Jesus AN, Henry BA. The role of oestrogen in determining sexual dimorphism in energy balance. J Physiol 2023; 601:435-449. [PMID: 36117117 PMCID: PMC10092637 DOI: 10.1113/jp279501] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 07/26/2022] [Indexed: 02/03/2023] Open
Abstract
Energy balance is determined by caloric intake and the rate at which energy is expended, with the latter comprising resting energy expenditure, physical activity and adaptive thermogenesis. The regulation of both energy intake and expenditure exhibits clear sexual dimorphism, with young women being relatively protected against weight gain and the development of cardiometabolic diseases. Preclinical studies have indicated that females are more sensitive to the satiety effects of leptin and insulin compared to males. Furthermore, females have greater thermogenic activity than males, whereas resting energy expenditure is generally higher in males than females. In addition to this, in post-menopausal women, the decline in sex steroid concentration, particularly in oestrogen, is associated with a shift in the distribution of adipose tissue and overall increased propensity to gain weight. Oestrogens are known to regulate energy balance and weight homeostasis via effects on both food intake and energy expenditure. Indeed, 17β-oestradiol treatment increases melanocortin signalling in the hypothalamus to cause satiety. Furthermore, oestrogenic action at the ventromedial hypothalamus has been linked with increased energy expenditure in female mice. We propose that oestrogen action on energy balance is multi-faceted and is fundamental to determining sexual dimorphism in weight control. Furthermore, evidence suggests that the decline in oestrogen levels leads to increased risk of weight gain and development of cardiometabolic disease in women across the menopausal transition.
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Affiliation(s)
- Anne Nicole De Jesus
- Metabolism, Obesity and Diabetes Program, Biomedicine, Discovery Institute, Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Belinda A Henry
- Metabolism, Obesity and Diabetes Program, Biomedicine, Discovery Institute, Department of Physiology, Monash University, Clayton, Victoria, Australia
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Naidu SAG, Wallace TC, Davies KJA, Naidu AS. Lactoferrin for Mental Health: Neuro-Redox Regulation and Neuroprotective Effects across the Blood-Brain Barrier with Special Reference to Neuro-COVID-19. J Diet Suppl 2023; 20:218-253. [PMID: 33977807 DOI: 10.1080/19390211.2021.1922567] [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] [Indexed: 10/21/2022]
Abstract
Overall mental health depends in part on the blood-brain barrier, which regulates nutrient transfer in-and-out of the brain and its central nervous system. Lactoferrin, an innate metal-transport protein, synthesized in the substantia nigra, particularly in dopaminergic neurons and activated microglia is vital for brain physiology. Lactoferrin rapidly crosses the blood-brain barrier via receptor-mediated transcytosis and accumulates in the brain capillary endothelial cells. Lactoferrin receptors are additionally present on glioma cells, brain micro-vessels, and neurons. As a regulator of neuro-redox, microglial lactoferrin is critical for protection/repair of neurons and healthy brain function. Iron imbalance and oxidative stress are common among patients with neurodegenerative disorders such as Parkinson's disease, Alzheimer's disease, dementia, depression, and multiple sclerosis. As an endogenous iron-chelator, lactoferrin prevents iron accumulation and dopamine depletion in Parkinson's disease patients. Oral lactoferrin supplementation could modulate the p-Akt/PTEN pathway, reduce Aβ deposition, and ameliorate cognitive decline in Alzheimer's disease. Novel lactoferrin-based nano-therapeutics have emerged as effective drug-delivery systems for clinical management of neurodegenerative disorders. Recent emergence of the Coronavirus disease-2019 (COVID-19) pandemic, initially considered a respiratory illness, demonstrated a broader virulence spectrum with the ability to cross the blood-brain barrier and inflict a plethora of neuropathological manifestations in the brain - the Neuro-COVID-19. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections are widely reported in Parkinson's disease, Alzheimer's disease, dementia, and multiple sclerosis patients with aggravated clinical outcomes. Lactoferrin, credited with several neuroprotective benefits in the brain could serve as a potential adjuvant in the clinical management of Neuro-COVID-19.
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Affiliation(s)
- Sreus A G Naidu
- N-terminus Research Laboratory, Yorba Linda, California, USA
| | - Taylor C Wallace
- Department of Nutrition and Food Studies, George Mason University, Fairfax, Virginia, USA
- Think Healthy Group, Washington, District of Columbia, USA
| | - Kelvin J A Davies
- Division of Biogerontology, Leonard Davis School of Gerontology, The University of Southern California, Los Angeles, California, USA
- Division of Molecular & Computational Biology, Dornsife College of Letters, Arts, and Sciences, The University of Southern California, Los Angeles, California, USA
- Department Biochemistry & Molecular Medicine, Keck School of Medicine of USC, The University of Southern California, Los Angeles, California, USA
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Kamel AS, Wahid A, Abdelkader NF, Ibrahim WW. Boosting amygdaloid GABAergic and neurotrophic machinery via dapagliflozin-enhanced LKB1/AMPK signaling in anxious demented rats. Life Sci 2022; 310:121002. [PMID: 36191679 DOI: 10.1016/j.lfs.2022.121002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/19/2022] [Accepted: 09/22/2022] [Indexed: 11/18/2022]
Abstract
Anxiety is a neuropsychiatric disturbance that is commonly manifested in various dementia forms involving Alzheimer's disease (AD). The mechanisms underlying AD-associated anxiety haven't clearly recognized the role of energy metabolism in anxiety represented by the amygdala's autophagic sensors; liver kinase B1 (LKB1)/adenosine monophosphate kinase (AMPK). Dapagliflozin (DAPA), a SGLT2 inhibitor, acts as an autophagic activator through LKB1 activation in several diseases including AD. Herein, the propitious yet undetected anxiolytic potential of DAPA as an autophagic enhancer was investigated in AD animal model with emphasis on amygdala's GABAergic neurotransmission and brain-derived neurotrophic factor (BDNF). Alzheimer's disease was induced by ovariectomy (OVX) along with seventy-days-D-galactose (D-Gal) administration (150 mg/kg/day, i.p). On the 43rd day of D-Gal injection, OVX/D-Gal-subjected rats received DAPA (1 mg/kg/day, p.o) alone or with dorsomorphin the AMPK inhibitor (DORSO, 25 μg/rat, i.v.). In the amygdala, LKB1/AMPK were activated by DAPA inducing GABAB2 receptor stimulation; an effect that was abrogated by DORSO. Dapagliflozin also replenished the amygdala GABA, NE, and 5-HT levels along with glutamate suppression. Moreover, DAPA triggered BDNF production with consequent activation of its receptor, TrkB through activating GABAB2-related downstream phospholipase C/diacylglycerol/protein kinase C (PLC/DAG/PKC) signaling. This may promote GABAA expression, verifying the crosstalk between GABAA and GABAB2. The DAPA's anxiolytic effect was visualized by improved behavioral traits in elevated plus maze together with amendment of amygdala' histopathological abnormalities. Thus, the present study highlighted DAPA's anxiolytic effect which was attributed to GABAB2 activation and its function to induce BDNF/TrkB and GABAA expression through PLC/DAG/PKC pathway in AMPK-dependent manner.
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Affiliation(s)
- Ahmed S Kamel
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Egypt
| | - Ahmed Wahid
- Department of Pharmaceutical Biochemistry, Faculty of Pharmacy, Alexandria University, Egypt
| | - Noha F Abdelkader
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Egypt.
| | - Weam W Ibrahim
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Egypt
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Shiffler JA, Goerger KA, Gorres-Martens BK. Estrogen receptor α activation modulates the gut microbiome and type 2 diabetes risk factors. Physiol Rep 2022; 10:e15344. [PMID: 35698449 PMCID: PMC9193963 DOI: 10.14814/phy2.15344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/05/2022] [Accepted: 05/11/2022] [Indexed: 11/24/2022] Open
Abstract
Estradiol and exercise can decrease risk factors associated with type 2 diabetes (T2D) including total body weight gain and abdominal fat gain. Estradiol functions through estrogen receptor (ER) α and ERβ. Some studies suggest that activation of ERα may provide protection against T2D. Female Wistar rats were ovariectomized and fed a high‐fat diet for 10 weeks and divided into the following 5 experimental groups: (1) no treatment (control), (2) exercise, (3) estradiol, (4) propylpyrazoletriyl (a selective ERα agonist), and (5) diarylpropionitrile (a selective ERβ agonist). ERα activation decreased the abundance of Firmicutes, and ERα and ERβ activation increased the abundance of Bacteroidetes. ERα activation decreased food consumption, and ERα and ERβ activation increased voluntary activity. Exercise was the only treatment to decrease the blood glucose and serum insulin levels. ERα activation, but not ERβ, increased hepatic protein expression of ACC and FAS and decreased hepatic protein expression of LPL. ERα activation also decreased hepatic mRNA expression of PPARα and PPARγ. This study elucidates the functions of estradiol by assessing specific activation of ERα and ERβ. As obesity increases the abundance of Firmicutes and decreases the abundance of Bacteroidetes, our study shows that ERα activation can restore the gut microbiome to non‐obese abundances. This study further provides novel insights into ERα’s role in hepatic fat metabolism via regulation of ACC, FAS, LPL, PPARα, and PPARγ.
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Affiliation(s)
- Janelle A Shiffler
- Exercise and Sport Sciences Department, Augustana University, Sioux Falls, South Dakota, USA
| | - Krista A Goerger
- Biology Department, University of Sioux Falls, Sioux Falls, South Dakota, USA
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Rodríguez-Landa JF. Considerations of Timing Post-ovariectomy in Mice and Rats in Studying Anxiety- and Depression-Like Behaviors Associated With Surgical Menopause in Women. Front Behav Neurosci 2022; 16:829274. [PMID: 35309685 PMCID: PMC8931748 DOI: 10.3389/fnbeh.2022.829274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 02/09/2022] [Indexed: 11/29/2022] Open
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Pham LT, Yamanaka K, Miyamoto Y, Waki H, Gouraud SSS. Estradiol-dependent gene expression profile in the amygdala of young ovariectomized spontaneously hypertensive rats. Physiol Genomics 2022; 54:99-114. [DOI: 10.1152/physiolgenomics.00082.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Estrogen plays a role in cardiovascular functions, emotional health, and energy homeostasis via estrogen receptors expressed in the brain. The comorbid relationship between rising blood pressure, a decline in mood and motivation, and body weight gain after menopause, when estrogen levels drop, suggests that the same brain area(s) contributes to protection from all of these postmenopausal disorders. The amygdala, a major limbic system nucleus known to express high estrogen receptor levels, is involved in the regulation of such physiological and psychological responses. We hypothesized that elevated estrogen levels contribute to premenopausal characteristics by activating specific genes and pathways in the amygdala. We examined the effect of 1-month estradiol treatment on the gene expression profile in the amygdala of ovariectomized young adult female spontaneously hypertensive rats. Estradiol substitution significantly decreased blood pressure, prevented body weight gain, and enhanced the voluntary physical activity of ovariectomized rats. In the amygdala of ovariectomized rats, estradiol treatment downregulated the expression of genes associated with estrogen signaling, cholinergic synapse, dopaminergic synapse, and long-term depression pathways. These findings indicate that the transcriptomic characteristics of the amygdala may be involved in estrogen-dependent regulation of blood pressure, physical activity motivation, and body weight control in young adult female spontaneously hypertensive rats.
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Affiliation(s)
- Linh T Pham
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
| | - Ko Yamanaka
- Department of Physiology, Graduate School of Health and Sports Sciences, Juntendo University, Inzai, Chiba, Japan
| | | | - Hidefumi Waki
- Department of Physiolgy, Graduate School of Health and Sports Sciences, Juntendo University, Inzai, Chiba, Japan
| | - Sabine S. S. Gouraud
- College of Liberal Arts, Department of Natural Sciences, International Christian University, Tokyo, 東京都, Japan
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Fritsch LJ, McCaulley SJ, Johnson CR, Lawson NJ, Gorres-Martens BK. Exercise prevents whole body type 2 diabetes risk factors better than estradiol replacement in rats. J Appl Physiol (1985) 2021; 131:1520-1531. [PMID: 34590912 DOI: 10.1152/japplphysiol.00098.2021] [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] [Indexed: 12/19/2022] Open
Abstract
The absence of estrogens in postmenopausal women is linked to an increased risk of type 2 diabetes (T2D) and estradiol replacement can decrease this risk. Notably, exercise can also treat and prevent T2D. This study seeks to understand the molecular mechanisms by which estradiol and exercise induce their beneficial effects via assessing whole body and cellular changes. Female Wistar rats were ovariectomized and fed a high-fat diet for 10 wk and divided into the following four experimental groups: 1) no treatment (control), 2) exercise (Ex), 3) estradiol replacement, and 4) Ex + estradiol. Both Ex and estradiol decreased the total body weight gain. However, only exercise effectively reduced the white adipose tissue (WAT) weight gain, food intake, blood glucose levels, and serum insulin levels. At the molecular level, exercise increased the noninsulin-stimulated pAkt levels in the WAT. In the liver, estradiol increased the protein expression of acetyl-CoA carboxylase (ACC) and fatty acid synthase (FAS) and estradiol decreased the hepatic protein expression of lipoprotein lipase (LPL). In the WAT, estradiol and exercise increased the protein expression of adipose triglyceride lipase (ATGL). Exercise provides better protection against T2D when considering whole body measurements, which may be due to increased noninsulin-stimulated pAkt in the WAT. However, at the cellular level, several molecular changes in fat metabolism and fat storage occurred in the liver and WAT with estradiol treatment.NEW & NOTEWORTHY Exercise provides better protection than estradiol against type 2 diabetes when considering whole body measurements including adipose tissue weight, blood glucose levels, and serum insulin levels, which may be due to increased noninsulin-stimulated pAkt in the adipose tissue. However, at the cellular level, several molecular changes in fat metabolism and fat storage occurred in the liver and adipose tissue with estradiol treatment.
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Affiliation(s)
- Luke J Fritsch
- Biology Department, Augustana University, Sioux Falls, South Dakota
| | - Skylar J McCaulley
- Biology Department, University of Sioux Falls, Sioux Falls, South Dakota
| | - Colton R Johnson
- Exercise Science Department, University of Sioux Falls, Sioux Falls, South Dakota
| | - Nicholaus J Lawson
- Exercise Science Department, University of Sioux Falls, Sioux Falls, South Dakota
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Bumgarner JR, Walker WH, Nelson RJ. Circadian rhythms and pain. Neurosci Biobehav Rev 2021; 129:296-306. [PMID: 34375675 PMCID: PMC8429267 DOI: 10.1016/j.neubiorev.2021.08.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 06/30/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022]
Abstract
The goal of this review is to provide a perspective on the nature and importance of the relationship between the circadian and pain systems. We provide: 1) An overview of the circadian and pain systems, 2) a review of direct and correlative evidence that demonstrates diurnal and circadian rhythms within the pain system; 3) a perspective highlighting the need to consider the role of a proposed feedback loop of circadian rhythm disruption and maladaptive pain; 4) a perspective on the nature of the relationship between circadian rhythms and pain. In summary, we propose that there is no single locus responsible for producing the circadian rhythms of the pain system. Instead, circadian rhythms of pain are a complex result of the distributed rhythms present throughout the pain system, especially those of the descending pain modulatory system, and the rhythms of the systems with which it interacts, including the opioid, endocrine, and immune systems.
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Affiliation(s)
- Jacob R Bumgarner
- Department of Neuroscience, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV 26506, USA.
| | - William H Walker
- Department of Neuroscience, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV 26506, USA
| | - Randy J Nelson
- Department of Neuroscience, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV 26506, USA
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Furukawa M, Izumo N, Manabe T, Kurono H, Hayamizu K, Nakano M, Watanabe Y. Therapeutic effects of sertraline on improvement of Ovariectomy-induced decreased spontaneous activity in mice. Drug Discov Ther 2021; 15:28-34. [PMID: 33627575 DOI: 10.5582/ddt.2020.03117] [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] [Indexed: 11/05/2022]
Abstract
We have already reported that ovariectomized (OVX) rats reduced the spontaneous activity during the dark period due to the decease of serotonin release in the amygdala. In this study, we examined the potential of sertraline, a selective serotonin reuptake inhibitor, on the recovery of less spontaneous activity seen in mice with OVX-induced despair-like behaviors. Female 9-week old ICR mice were underwent either OVX or sham surgery. Sertraline (10 mg/kg/day, s.c.) or saline were started to administer to each group for 8 weeks (6 times/week) from the 8th week after OVX. Each spontaneous activity of mouse was evaluated during the dark period (19:00-07:00) using an infrared sensor. Moreover, mRNA expression levels of tryptophan hydroxylase (TPH) and X-box binding protein 1 (XBP1) were measured in the hippocampus and prefrontal cortex using by a real-time PCR method. We found out that the OVX-induced despair-like behaviors were improved by the continuous administration of sertraline. After treatment of OVX, our real-time PCR data showed that sertraline significantly suppressed the upregulation of XBP1 expression levels in both hippocampus and prefrontal cortex, although this suppression of the downregulation of TPH expression levels was seen in only hippocampus. These results suggest that sertraline improves the decrease in spontaneous activity induced by OVX assessed by the hippocampus suppressing decreased serotonin synthesis in the serotonergic neuron.
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Affiliation(s)
- Megumi Furukawa
- Center for pharmaceutical education, Yokohama University of Pharmacy, Yokohama, Kanagawa, Japan
| | - Nobuo Izumo
- Laboratory of Food Chemistry, Yokohama University of Pharmacy, Yokohama, Japan
| | - Takayuki Manabe
- Laboratory for Neuroanatomy and Neuropharmacology, Department of Nursing, Faculty of Nursing, Chukyogakuin University, Mizunami, Gifu, Japan
| | - Haruna Kurono
- Laboratory for Neuroanatomy and Neuropharmacology, Department of Nursing, Faculty of Nursing, Chukyogakuin University, Mizunami, Gifu, Japan
| | - Kohsuke Hayamizu
- Laboratory of Food Chemistry, Yokohama University of Pharmacy, Yokohama, Japan
| | - Makoto Nakano
- Laboratory of Food Chemistry, Yokohama University of Pharmacy, Yokohama, Japan
| | - Yasuo Watanabe
- General Health Medical Center, Yokohama University of Pharmacy, Yokohama, Japan
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Bernardo B, Joaquim S, Garren J, Boucher M, Houle C, LaCarubba B, Qiao S, Wu Z, Esquejo RM, Peloquin M, Kim H, Breen DM. Characterization of cachexia in the human fibrosarcoma HT-1080 mouse tumour model. J Cachexia Sarcopenia Muscle 2020; 11:1813-1829. [PMID: 32924335 PMCID: PMC7749621 DOI: 10.1002/jcsm.12618] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/22/2020] [Accepted: 07/07/2020] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Cancer cachexia is a complex metabolic disease with unmet medical need. Although many rodent models are available, none are identical to the human disease. Therefore, the development of new preclinical models that simulate some of the physiological, biochemical, and clinical characteristics of the human disease is valuable. The HT-1080 human fibrosarcoma tumour cell line was reported to induce cachexia in mice. Therefore, the purpose of this work was to determine how well the HT-1080 tumour model could recapitulate human cachexia and to examine its technical performance. Furthermore, the efficacy of ghrelin receptor activation via anamorelin treatment was evaluated, because it is one of few clinically validated mechanisms. METHODS Female severe combined immunodeficient mice were implanted subcutaneously or heterotopically (renal capsule) with HT-1080 tumour cells. The cachectic phenotype was evaluated during tumour development, including body weight, body composition, food intake, muscle function (force and fatigue), grip strength, and physical activity measurements. Heterotopic and subcutaneous tumour histology was also compared. Energy balance was evaluated at standard and thermoneutral housing temperatures in the subcutaneous model. The effect of anamorelin (ghrelin analogue) treatment was also examined. RESULTS The HT-1080 tumour model had excellent technical performance and was reproducible across multiple experimental conditions. Heterotopic and subcutaneous tumour cell implantation resulted in similar cachexia phenotypes independent of housing temperature. Tumour weight and histology was comparable between both routes of administration with minimal inflammation. Subcutaneous HT-1080 tumour-bearing mice presented with weight loss (decreased fat mass and skeletal muscle mass/fibre cross-sectional area), reduced food intake, impaired muscle function (reduced force and grip strength), and decreased spontaneous activity and voluntary wheel running. Key circulating inflammatory biomarkers were produced by the tumour, including growth differentiation factor 15, Activin A, interleukin 6, and TNF alpha. Anamorelin prevented but did not reverse anorexia and weight loss in the subcutaneous model. CONCLUSIONS The subcutaneous HT-1080 tumour model displays many of the perturbations of energy balance and physical performance described in human cachexia, consistent with the production of key inflammatory factors. Anamorelin was most effective when administered early in disease progression. The HT-1080 tumour model is valuable for studying potential therapeutic targets for the treatment of cachexia.
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Affiliation(s)
- Barbara Bernardo
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | | | - Jeonifer Garren
- Biostatistics, Early Clinical Development, Pfizer Inc., Cambridge, MA, USA
| | - Magalie Boucher
- Drug Safety Research and Development, Pfizer Inc., Groton, CT, USA
| | | | | | - Shuxi Qiao
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | - Zhidan Wu
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | - Ryan M Esquejo
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | - Matthew Peloquin
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | - Hanna Kim
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
| | - Danna M Breen
- Internal Medicine Research Unit, Pfizer Inc., Cambridge, MA, USA
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Saied NM, Georgy GS, Hussien RM, Hassan WA. Neuromodulatory effect of curcumin on catecholamine systems and inflammatory cytokines in ovariectomized female rats. Clin Exp Pharmacol Physiol 2020; 48:337-346. [PMID: 33098686 DOI: 10.1111/1440-1681.13427] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 10/12/2020] [Accepted: 10/19/2020] [Indexed: 12/21/2022]
Abstract
Anti-inflammatory products may represent the future for depressive disorder therapies. Curcumin (CUR) is a polyphenol and an active component of the turmeric plant Curcuma longa. The aim of this study was to investigate the impact of CUR, as a natural anti-inflammatory agent, on neuro-inflammation related to depression and compare it with the effects of fluoxetine (FLX) and estradiol (E2 ) in ovariectomized (OVX) rats. The experimental animals were divided into the following five treatment groups (n = 10): sham-operated, OVX, OVX-E2 (100 μg/kg, im, every other day), OVX-FLX (20 mg/kg, ip, daily), and OVX-CUR (100 mg/kg, po, daily). The results indicated that CUR improved the animals' performances in the open field test and modulated dopamine (DA) and norepinephrine levels in several brain regions compared with the OVX group. CUR resulted in the down-regulation of monoamine oxidase b and up-regulation of tyrosine hydroxylase, as well asDA receptor mRNA in the limbic region. In addition, CUR significantly attenuated the production of serum corticosterone hormone, tumour necrosis factor-alpha, interleukin-β1, interleukin-6, and nitric oxide in the limbic system. Furthermore, CUR normalized malondialdehyde levels and led to a significant upsurge in total antioxidant capacity, compared with the OVX group. Consequently, CUR, besides being harmless, was efficient against inflammation and oxidative-nitrosative stress, showing a greater effect on DA receptor expression than FLX and E2 in OVX rats.
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Affiliation(s)
- Nashwa M Saied
- Department of Hormone, National Organization for Drug Control and Research, Giza, Egypt
| | - Gehan S Georgy
- Department of Pharmacology, National Organization for Drug Control and Research, Giza, Egypt
| | - Rokaya M Hussien
- Department of Hormone, National Organization for Drug Control and Research, Giza, Egypt
| | - Wafaa A Hassan
- Department of Hormone, National Organization for Drug Control and Research, Giza, Egypt
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Labouesse MA, Cola RB, Patriarchi T. GPCR-Based Dopamine Sensors-A Detailed Guide to Inform Sensor Choice for In vivo Imaging. Int J Mol Sci 2020; 21:E8048. [PMID: 33126757 PMCID: PMC7672611 DOI: 10.3390/ijms21218048] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 09/25/2020] [Accepted: 09/26/2020] [Indexed: 12/12/2022] Open
Abstract
Understanding how dopamine (DA) encodes behavior depends on technologies that can reliably monitor DA release in freely-behaving animals. Recently, red and green genetically encoded sensors for DA (dLight, GRAB-DA) were developed and now provide the ability to track release dynamics at a subsecond resolution, with submicromolar affinity and high molecular specificity. Combined with rapid developments in in vivo imaging, these sensors have the potential to transform the field of DA sensing and DA-based drug discovery. When implementing these tools in the laboratory, it is important to consider there is not a 'one-size-fits-all' sensor. Sensor properties, most importantly their affinity and dynamic range, must be carefully chosen to match local DA levels. Molecular specificity, sensor kinetics, spectral properties, brightness, sensor scaffold and pharmacology can further influence sensor choice depending on the experimental question. In this review, we use DA as an example; we briefly summarize old and new techniques to monitor DA release, including DA biosensors. We then outline a map of DA heterogeneity across the brain and provide a guide for optimal sensor choice and implementation based on local DA levels and other experimental parameters. Altogether this review should act as a tool to guide DA sensor choice for end-users.
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Affiliation(s)
- Marie A. Labouesse
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;
- Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, USA
| | - Reto B. Cola
- Anatomy and Program in Neuroscience, University of Fribourg, 1700 Fribourg, Switzerland;
- Institute of Pharmacology and Toxicology, University of Zurich, 8057 Zurich, Switzerland
| | - Tommaso Patriarchi
- Institute of Pharmacology and Toxicology, University of Zurich, 8057 Zurich, Switzerland
- Neuroscience Center Zurich, University and ETH Zurich, 8057 Zurich, Switzerland
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Neonatal treatment with clomipramine modifies the expression of estrogen receptors in brain areas of male adult rats. Brain Res 2019; 1724:146443. [DOI: 10.1016/j.brainres.2019.146443] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 09/04/2019] [Accepted: 09/08/2019] [Indexed: 01/03/2023]
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15
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Zhou XD, Shi DD, Zhang ZJ. Ameliorative effects of Radix rehmanniae extract on the anxiety- and depression-like symptoms in ovariectomized mice: A behavioral and molecular study. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2019; 63:153012. [PMID: 31301535 DOI: 10.1016/j.phymed.2019.153012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 06/22/2019] [Accepted: 07/02/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Menopause is closely associated with the risk of anxiety and depression in a woman's life. Despite the numerous reports on the effects of Radix rehmanniae extract (RRE) on various types of depression, there are few studies exploring the effects of RRE on the menopausal anxiety and depression. PURPOSE To investigate whether RRE could alleviate the menopausal anxiety and depression in ovariectomized (OVX) mice submitted to chronic unpredictable mild stress (CUMS). METHODS OVX mice were treated with 2.6 g/kg RRE for 5 weeks. After a series of behavior tests, serum, uterus, and brain tissues were collected for the measurement of neurotransmitters and their related biomarkers, neurotrophins, and estrogen receptor α (ERα) and β (ERβ). RESULTS RRE showed antidepressant and anxiolytic effects through these behavior tests, but had no effects on the OVX-induced weight gains, uterine shrinkage and drop of serum estrogen level. RRE restored the levels of serotonin (5-HT), dopamine (DA) and its metabolite 3,4-dihydroxyphenylacetic acid (DOPAC), Glutamate (Glu), gamma-Aminobutyric acid (GABA) and their related biomarkers in different brain regions. RRE also reversed OVX-induced decrease in the expression levels of neurotrophins in uterus and brain regions except for uterine nerve growth factor (NGF). Moreover, RRE restored and even enhanced ERβ expression levels in uterus and brain without affecting uterine, hippocampal and cortical ERα. CONCLUSION This study demonstrated the antidepressant and anxiolytic effects of RRE in OVX mice, which were possibly mediated via their modulation of brain neurotransmitters, and regulation of neurotrophins and activation of ERβ.
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Affiliation(s)
- Xi-Dan Zhou
- School of Chinese Medicine, LKS Faculty of Medicine, the University of Hong Kong, 10 Sassoon Road, Pokfulam, Hong Kong, China
| | - Dong-Dong Shi
- Shanghai Mental Health Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhang-Jin Zhang
- School of Chinese Medicine, LKS Faculty of Medicine, the University of Hong Kong, 10 Sassoon Road, Pokfulam, Hong Kong, China.
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Gorres-Martens BK, Field TJ, Schmidt ER, Munger KA. Exercise prevents HFD- and OVX-induced type 2 diabetes risk factors by decreasing fat storage and improving fuel utilization. Physiol Rep 2019; 6:e13783. [PMID: 29981201 PMCID: PMC6035332 DOI: 10.14814/phy2.13783] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 06/11/2018] [Accepted: 06/14/2018] [Indexed: 11/24/2022] Open
Abstract
Previous studies suggest that the loss of estrogens increase one's risk for type 2 diabetes (T2D), and combining the loss of estrogens with a high-fat diet (HFD) poses an even greater risk for T2D. The extent to which exercise can ameliorate the deleterious effects of estrogen loss combined with a HFD and the molecular mechanisms accounting for the whole body changes is currently unknown. Therefore, we fed female Wistar rats a standard diet or a HFD for 10 weeks. The rats fed the HFD were either ovariectomized (OVX) or their ovaries remained intact. A subset of the HFD/OVX rats also underwent exercise training on a motor-driven treadmill. Exercise significantly reduced the total body weight gain, periuterine white adipose tissue (WAT) weight, hyperglycemia, and hyperinsulinemia. Additionally, the ability to store fat, as measured by lipoprotein lipase (LPL) in the WAT, was increased in the HFD/OVX group; however, exercise reduced the LPL levels. Furthermore, the combination of the HFD with OVX decreased the WAT citrate synthase protein level, which was increased with exercise. These data suggest that even during the combined HFD/OVX physiological state, exercise can decrease several risk factors associated with T2D, decrease fat storage, and increase fuel utilization.
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Affiliation(s)
| | - Tyler J Field
- Exercise and Sport Sciences Department, Augustana University, Sioux Falls, South Dakota
| | - Emma R Schmidt
- Exercise and Sport Sciences Department, Augustana University, Sioux Falls, South Dakota
| | - Karen A Munger
- Research & Development, Sioux Falls VA Health Care System, Sioux Falls, South Dakota
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17
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Zhou XD, Shi DD, Wang HN, Tan QR, Zhang ZJ. Aqueous extract of lily bulb ameliorates menopause-like behavior in ovariectomized mice with novel brain-uterus mechanisms distinct from estrogen therapy. Biomed Pharmacother 2019; 117:109114. [DOI: 10.1016/j.biopha.2019.109114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/27/2019] [Accepted: 06/10/2019] [Indexed: 12/17/2022] Open
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18
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Guo Q, Ebihara K, Fujiwara H, Toume K, Awale S, Araki R, Yabe T, Dong E, Matsumoto K. Kami-shoyo-san ameliorates sociability deficits in ovariectomized mice, a putative female model of autism spectrum disorder, via facilitating dopamine D 1 and GABA A receptor functions. JOURNAL OF ETHNOPHARMACOLOGY 2019; 236:231-239. [PMID: 30862522 DOI: 10.1016/j.jep.2019.03.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 02/01/2019] [Accepted: 03/05/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Kami-shoyo-san (KSS) is a Kampo formula used clinically for menopause-related symptoms in Japan. However, the effect of KSS on autism spectrum disorder (ASD), a developmental disorder with a higher prevalence in males than in females, has not been reported yet. AIM OF THE STUDY It is accepted generally that dysfunction in the GABAergic system is associated with pathogenesis of ASD. In our previous study, a decrease in brain allopregnanolone (ALLO), a positive allosteric GABAA receptor modulator, induced ASD-like symptoms such as impaired sociability-related performance and increased repetitive self-grooming behavior in male mice, and that KSS ameliorated these behavioral abnormalities via GABAA receptor- and dopamine D1 receptor-mediated mechanisms. In this study, to better understand a gender difference in the prevalence of ASD, we examined whether dissection of ovary (OVX), a major organ secreting progesterone in females, causes ASD-like behaviors in a manner dependent on brain ALLO levels, and if so, how KSS affects the behaviors. MATERIALS AND METHODS Six-week-old ICR female mice received ovariectomy, and KSS (74 mg/kg and 222 mg/kg, p.o.) were treated before 1 h starting each behavioral test. The sociability, social anxiety-like behavior, and self-grooming behavior were analyzed by the resident-intruder test, mirror chamber test, and open field test, respectively. After finishing the behavioral experiment, the ALLO content in the brain was measured by ELISA. Furthermore, we examined the effects of OVX on the neuro-signaling pathways in the prefrontal cortex and striatum by Western blotting. RESULTS The results revealed that OVX induced sociability deficits and social anxiety-related behaviors, but not repetitive self-grooming behavior, and that these behavioral changes were accompanied not only by a decrease of brain ALLO levels, but also by impairment of CREB- and CaMKIIα-mediated neuro-signaling in the prefrontal cortex. Moreover, the administration of KSS had no effect on the brain ALLO level, but significantly ameliorated the OVX-induced behavioral and neurochemical changes via facilitation of GABAA receptor and dopamine D1 receptor-mediated neurotransmission. CONCLUSIONS These findings suggest that a decrease in gonadal hormone-derived ALLO plays a major role in ASD-like behaviors in female mice and that KSS is beneficial for the treatment of ASD in females.
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Affiliation(s)
- Qingyun Guo
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Ken Ebihara
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Hironori Fujiwara
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan.
| | - Kazufumi Toume
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Suresh Awale
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Ryota Araki
- Laboratory of Functional Biomolecules and Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1, Nagaotoge-cho, Hirakata City, Osaka 573-0101, Japan
| | - Takeshi Yabe
- Laboratory of Functional Biomolecules and Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1, Nagaotoge-cho, Hirakata City, Osaka 573-0101, Japan
| | - Erbo Dong
- Psychiatric Institute, Department of Psychiatry, College of Medicine, University of Illinois, Chicago, IL, 60612, USA
| | - Kinzo Matsumoto
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
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The guanine nucleotide exchange factor, Spata13, influences social behaviour and nocturnal activity. Mamm Genome 2019; 30:54-62. [PMID: 31020388 PMCID: PMC6491400 DOI: 10.1007/s00335-019-09800-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 04/08/2019] [Indexed: 11/08/2022]
Abstract
Spermatogenesis-associated protein 13 (Spata13) is a guanine nucleotide exchange factor (GEF) enriched in discrete brain regions in the adult, with pronounced expression in the extended central amygdala (CeA). Loss of Spata13, also known as the adenomatous polyposis coli exchange factor Asef2, has no identifiable phenotype although it has been shown to reduce the number and size of intestinal tumours in Apc (Min/+) mice. Nevertheless, its brain-related functions have not been investigated. To pursue this, we have generated a Spata13 knockout mouse line using CRISPR-mediated deletion of an exon containing the GTPase domain that is common to multiple isoforms. Homozygous mutants were viable and appeared normal. We subjected both male and female cohorts to a comprehensive battery of behavioural tests designed to investigate particular CeA-related functions. Here, we show that Spata13 modulates social behaviour with homozygous mutants being subordinate to wildtype controls. Furthermore, female homozygotes show increased activity in home cages during the dark phase of the light–dark cycle. In summary, Spata13 modulates social hierarchy in both male and female mice in addition to affecting voluntary activity in females.
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20
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Espinosa E, Curtis KS. Increased locomotor activity in estrogen-treated ovariectomized rats is associated with nucleus accumbens dopamine and is not reduced by dietary sodium deprivation. Integr Zool 2019; 13:783-794. [PMID: 29851282 DOI: 10.1111/1749-4877.12333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Estrogens are well known to increase locomotor activity in laboratory rodents; however, the underlying mechanism remains unclear. We used voluntary wheel running by female rats as an index of locomotor behavior to investigate this issue. We first determined whether the estrogen-induced increase in locomotion was susceptible to inhibition by a physiological challenge, and next whether it was associated with dopaminergic activation in the central reward area, nucleus accumbens. Ovariectomized rats were given estradiol or the oil vehicle and housed in cages with or without running wheels. All rats were given regular rodent chow for 1 week, a sodium-deficient diet for the next week, and then were returned to a regular diet for another week. At the end of the last week, all rats were killed, brains were extracted and dopamine levels in the nucleus accumbens were measured. As expected, estradiol treatment increased distance run. Surprisingly, dietary sodium deprivation further increased running, but this appeared to be related to experience with wheel running, rather than to sodium deprivation, per se. Dopamine was greater in the nucleus accumbens of estradiol-treated rats that ran compared to all other groups. Thus, the estrogen-induced increase in locomotion is a robust phenomenon that is not inhibited by a body sodium challenge and is associated with elevated levels of dopamine in reward pathways. These findings raise the possibility that the estrogen-induced increase in locomotor activity, which occurs during a hormonal milieu conducive to reproduction, may reflect mate-seeking behavior and, thereby, maximize reproductive success.
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Affiliation(s)
- Enith Espinosa
- Oklahoma State University - Center for Health Sciences, Tulsa, Oklahoma, USA
| | - Kathleen S Curtis
- Oklahoma State University - Center for Health Sciences, Tulsa, Oklahoma, USA
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21
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Brain Microdialysate Monoamines in Relation to Circadian Rhythms, Sleep, and Sleep Deprivation - a Systematic Review, Network Meta-analysis, and New Primary Data. J Circadian Rhythms 2019; 17:1. [PMID: 30671123 PMCID: PMC6337052 DOI: 10.5334/jcr.174] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Disruption of the monoaminergic system, e.g. by sleep deprivation (SD), seems to promote certain diseases. Assessment of monoamine levels over the circadian cycle, during different sleep stages and during SD is instrumental to understand the molecular dynamics during and after SD. To provide a complete overview of all available evidence, we performed a systematic review. A comprehensive search was performed for microdialysis and certain monoamines (dopamine, serotonin, noradrenaline, adrenaline), certain monoamine metabolites (3,4-dihydroxyphenylacetic acid (DOPAC), 5-hydroxyindoleacetic acid (5-HIAA)) and a precursor (5-hydroxytryptophan (5-HTP)) in PubMed and EMBASE. After screening of the search results by two independent reviewers, 94 publications were included. All results were tabulated and described qualitatively. Network-meta analyses (NMAs) were performed to compare noradrenaline and serotonin concentrations between sleep stages. We further present experimental monoamine data from the medial prefrontal cortical (mPFC). Monoamine levels varied with brain region and circadian cycle. During sleep, monoamine levels generally decreased compared to wake. These qualitative observations were supported by the NMAs: noradrenaline and serotonin levels decreased from wakefulness to slow wave sleep and decreased further during Rapid Eye Movement sleep. In contrast, monoamine levels generally increased during SD, and sometimes remained high even during subsequent recovery. Decreases during or after SD were only reported for serotonin. In our experiment, SD did not affect any of the mPFC monoamine levels. Concluding, monoamine levels vary over the light-dark cycle and between sleep stages. SD modifies the patterns, with effects sometimes lasting beyond the SD period.
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22
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Zidon TM, Park YM, Welly RJ, Woodford ML, Scroggins RJ, Britton SL, Koch LG, Booth FW, Padilla J, Kanaley JA, Vieira-Potter VJ. Voluntary wheel running improves adipose tissue immunometabolism in ovariectomized low-fit rats. Adipocyte 2018; 7:20-34. [PMID: 29226756 DOI: 10.1080/21623945.2017.1402991] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Loss of ovarian hormones is associated with increased adiposity, white adipose tissue (WAT) inflammation, and insulin resistance (IR). Previous work demonstrated ovariectomized (OVX) rats bred for high aerobic fitness (HCR) are protected against weight gain and IR compared to rats bred for low aerobic fitness (LCR) yet wheel running prevents OVX-induced IR in LCR rats. The purpose of this study was to determine whether adipose tissue immunometabolic characteristics from female HCR and LCR rats differs before or after OVX, and whether wheel running mitigates OVX-induced adipose tissue immunometabolic changes in LCR rats. Female OVX HCR and LCR rats were all fed a high fat diet (HFD) (n = 7-8/group) and randomized to either a running wheel or remain sedentary for 11 weeks. Ovary-intact rats (n = 7-12/group) were fed a standard chow diet with no wheel. Ovary-intact LCR rats had a greater visceral WAT inflammatory profile compared to HCR. Following OVX, sedentary LCR rats had greater serum leptin (p<0.001) and WAT inflammation (p<0.05) than sedentary HCR. Wheel running normalized the elevated serum leptin and reduced both visceral (p<0.05) and subcutaneous (p<0.03) WAT inflammatory markers in the LCR rats. Paradoxically, wheel running increased some markers of WAT inflammation in OVX HCR rats (p<0.05), which correlated with observed weight gain. Taken together, HCR rats appear to have a healthier WAT immune and metabolic profile compared to LCR, even following OVX. Wheel running improves WAT health in previously sedentary LCR rats. On the other hand, increased WAT inflammation is associated with adiposity gain despite a high volume of wheel running in HCR rats.
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Affiliation(s)
- Terese M. Zidon
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
| | - Young-Min Park
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
| | - Rebecca J. Welly
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
| | - Makenzie L. Woodford
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
| | - Rebecca J. Scroggins
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
| | - Steven L. Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, MI, US
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, US
| | - Lauren G. Koch
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, MI, US
| | - Frank W. Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, US
| | - Jaume Padilla
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
- Department of Child Health, University of Missouri, Columbia, MO, US
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO, US
| | - Jill A. Kanaley
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, US
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23
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Rosenfeld CS. Sex-dependent differences in voluntary physical activity. J Neurosci Res 2017; 95:279-290. [PMID: 27870424 DOI: 10.1002/jnr.23896] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Revised: 07/25/2016] [Accepted: 08/01/2016] [Indexed: 12/12/2022]
Abstract
Numbers of overweight and obese individuals are increasing in the United States and globally, and, correspondingly, the associated health care costs are rising dramatically. More than one-third of children are currently considered obese with a predisposition to type 2 diabetes, and it is likely that their metabolic conditions will worsen with age. Physical inactivity has also risen to be the leading cause of many chronic, noncommunicable diseases (NCD). Children are more physically inactive now than they were in past decades, which may be due to intrinsic and extrinsic factors. In rodents, the amount of time engaged in spontaneous activity within the home cage is a strong predictor of later adiposity and weight gain. Thus, it is important to understand primary motivators stimulating physical activity (PA). There are normal sex differences in PA levels in rodents and humans. The perinatal environment can induce sex-dependent differences in PA disturbances. This Review considers the current evidence for sex differences in PA in rodents and humans. The rodent studies showing that early exposure to environmental chemicals can shape later adult PA responses are discussed. Next, whether there are different motivators stimulating exercise in male vs. female humans are examined. Finally, the brain regions, genes, and pathways that modulate PA in rodents, and possibly by translation in humans, are described. A better understanding of why each sex remains physically active through the life span could open new avenues for preventing and treating obesity in children and adults. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Cheryl S Rosenfeld
- Department of Biomedical Sciences, University of Missouri, Columbia, Missouri.,Bond Life Sciences Center University of Missouri, Columbia, Missouri.,Thompson Center for Autism and Neurobehavioral Disorders, University of Missouri, Columbia, Missouri.,Genetics Area Program, University of Missouri, Columbia, Missouri
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Nutsch VL, Bell MR, Will RG, Yin W, Wolfe A, Gillette R, Dominguez JM, Gore AC. Aging and estradiol effects on gene expression in the medial preoptic area, bed nucleus of the stria terminalis, and posterodorsal medial amygdala of male rats. Mol Cell Endocrinol 2017; 442:153-164. [PMID: 28007657 PMCID: PMC5276730 DOI: 10.1016/j.mce.2016.12.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/17/2016] [Accepted: 12/18/2016] [Indexed: 12/27/2022]
Abstract
Studies on the role of hormones in male reproductive aging have traditionally focused on testosterone, but estradiol (E2) also plays important roles in the control of masculine physiology and behavior. Our goal was to examine the effects of E2 on the expression of genes selected for E2-sensitivity, involvement in behavioral neuroendocrine functions, and impairments with aging. Mature adult (MAT, 5 mo) and aged (AG, 18 mo) Sprague-Dawley male rats were castrated, implanted with either vehicle or E2 subcutaneous capsules, and euthanized one month later. Bilateral punches were taken from the bed nucleus of the stria terminalis (BnST), posterodorsal medial amygdala (MePD) and the preoptic area (POA). RNA was extracted, and expression of 48 genes analyzed by qPCR using Taqman low-density arrays. Results showed that effects of age and E2 were age- and region-specific. In the POA, 5 genes were increased with E2 compared to vehicle, and there were no age effects. By contrast the BnST showed primarily age-related changes, with 6 genes decreasing with age. The MePD had 5 genes that were higher in aged than mature males, and 17 genes with significant interactions between age and E2. Gene families identified in the MePD included nuclear hormone receptors, neurotransmitters and neuropeptides and their receptors. Ten serum hormones were assayed in these same males, with results revealing both age- and E2-effects, in several cases quite profound. These results support the idea that the male brain continues to be highly sensitive to estradiol even with aging, but the nature of the response can be substantially different in mature and aging animals.
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Affiliation(s)
- Victoria L Nutsch
- Institute for Neuroscience, The University of Texas at Austin, Austin, TX, USA
| | - Margaret R Bell
- Division of Pharmacology and Toxicology, The University of Texas at Austin, Austin, TX, USA
| | - Ryan G Will
- Department of Psychology, The University of Texas at Austin, Austin, TX, USA
| | - Weiling Yin
- Division of Pharmacology and Toxicology, The University of Texas at Austin, Austin, TX, USA
| | - Andrew Wolfe
- Johns Hopkins University School of Medicine, Baltimore, MD, 21298, USA
| | - Ross Gillette
- Institute of Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, USA
| | - Juan M Dominguez
- Institute for Neuroscience, The University of Texas at Austin, Austin, TX, USA; Department of Psychology, The University of Texas at Austin, Austin, TX, USA
| | - Andrea C Gore
- Institute for Neuroscience, The University of Texas at Austin, Austin, TX, USA; Division of Pharmacology and Toxicology, The University of Texas at Austin, Austin, TX, USA; Department of Psychology, The University of Texas at Austin, Austin, TX, USA; Institute of Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, USA.
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25
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Chen H, Wang XT, Bo QG, Zhang DM, Qi ZB, Liu X, Jia CX. Menarche, menstrual problems and suicidal behavior in Chinese adolescents. J Affect Disord 2017; 209:53-58. [PMID: 27886570 DOI: 10.1016/j.jad.2016.11.027] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 10/29/2016] [Accepted: 11/16/2016] [Indexed: 11/26/2022]
Abstract
BACKGROUND Menarche is the first menstrual cycle. Menstrual problems, such as dysmenorrheal menorrhagia, oligomenorrhea, and irregular cycle are common in female adolescents. This research aims to examine the associations between age at menarche and menstrual problems and suicidal behavior among Chinese female adolescents. METHODS An epidemiological survey of 5831 female adolescents from eight high schools of three counties of Shandong province, China, was conducted. A self-administered paper-and-pencil questionnaire was used to collect information. Logistic regression analyses were used to examine the association between menstruation and suicidality. RESULTS The mean age of the sample was 15.02 (SD=1.44) years. Of the sample, 5,231 (90.0%) had experienced their first menstrual cycle, and 23.2%, 10.4%, and 4.5% of the sample reported having had suicidal ideation, plan and attempt, respectively. In multivariate models, menarche at ≤11 years was associated with increased risk of suicidal ideation (OR=1.41, 95%CI: 1.10-1.81) and menarche at 12 years was associated with suicide plan (OR=1.23, 95%CI: 1.00-1.51). Irregular menstrual cycle was significantly associated with increased risk of suicidal ideation (OR=1.40, 95%CI: 1.05-1.86) and menstrual period less than or equal to 4 days was significantly associated with increased risk of suicide plan (OR=1.32, 95%CI: 1.06-1.66). LIMITATIONS This cross-sectional study cannot establish the causal directions between menstrual problems and suicidality in adolescents. CONCLUSIONS Our study suggests that earlier menarche, irregular menstrual cycle and short menstrual period are associated with suicidal behavior in female adolescents. Further research is warranted to examine the causal relationship between menstrual problems and suicidal behavior in adolescents.
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Affiliation(s)
- Hua Chen
- Department of Epidemiology, Shandong University School of Public Health & Shandong University Center for Suicide Prevention Research, Jinan, China
| | - Xin-Ting Wang
- Department of Epidemiology, Shandong University School of Public Health & Shandong University Center for Suicide Prevention Research, Jinan, China
| | - Qi-Gui Bo
- Centers for Disease Control and Prevention of Lijin County, Lijin, China
| | - Dao-Ming Zhang
- Centers for Disease Control and Prevention of Yanggu County, Yanggu, China
| | - Zhen-Biao Qi
- Centers for Disease Control and Prevention of Zoucheng County, Zoucheng, China
| | - Xianchen Liu
- Department of Epidemiology, Shandong University School of Public Health & Shandong University Center for Suicide Prevention Research, Jinan, China; The University of Tennessee Health Science Center, Memphis, TN, USA
| | - Cun-Xian Jia
- Department of Epidemiology, Shandong University School of Public Health & Shandong University Center for Suicide Prevention Research, Jinan, China.
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Vieira-Potter VJ, Padilla J, Park YM, Welly RJ, Scroggins RJ, Britton SL, Koch LG, Jenkins NT, Crissey JM, Zidon T, Morris EM, Meers GME, Thyfault JP. Female rats selectively bred for high intrinsic aerobic fitness are protected from ovariectomy-associated metabolic dysfunction. Am J Physiol Regul Integr Comp Physiol 2015; 308:R530-42. [PMID: 25608751 DOI: 10.1152/ajpregu.00401.2014] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Ovariectomized rodents model human menopause in that they rapidly gain weight, reduce spontaneous physical activity (SPA), and develop metabolic dysfunction, including insulin resistance. How contrasting aerobic fitness levels impacts ovariectomy (OVX)-associated metabolic dysfunction is not known. Female rats selectively bred for high and low intrinsic aerobic fitness [high-capacity runners (HCR) and low-capacity runners (LCR), respectively] were maintained under sedentary conditions for 39 wk. Midway through the observation period, OVX or sham (SHM) operations were performed providing HCR-SHM, HCR-OVX, LCR-SHM, and LCR-OVX groups. Glucose tolerance, energy expenditure, and SPA were measured before and 4 wk after surgery, while body composition via dual-energy X-ray absorptiometry and adipose tissue distribution, brown adipose tissue (BAT), and skeletal muscle phenotype, hepatic lipid content, insulin resistance via homeostatic assessment model of insulin resistance and AdipoIR, and blood lipids were assessed at death. Remarkably, HCR were protected from OVX-associated increases in adiposity and insulin resistance, observed only in LCR. HCR rats were ∼30% smaller, had ∼70% greater spontaneous physical activity (SPA), consumed ∼10% more relative energy, had greater skeletal muscle proliferator-activated receptor coactivator 1-alpha, and ∼40% more BAT. OVX did not increase energy intake and reduced SPA to the same extent in both HCR and LCR. LCR were particularly affected by an OVX-associated reduction in resting energy expenditure and experienced a reduction in relative BAT; resting energy expenditure correlated positively with BAT across all animals (r = 0.6; P < 0.001). In conclusion, despite reduced SPA following OVX, high intrinsic aerobic fitness protects against OVX-associated increases in adiposity and insulin resistance. The mechanism may involve preservation of resting energy expenditure.
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Affiliation(s)
| | - Jaume Padilla
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; Child Health, University of Missouri, Columbia, Missouri; Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri
| | - Young-Min Park
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri
| | - Rebecca J Welly
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri
| | - Rebecca J Scroggins
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri
| | - Steven L Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Lauren G Koch
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Nathan T Jenkins
- Department of Kinesiology, University of Georgia, Athens, Georgia
| | - Jacqueline M Crissey
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; Department of Nutritional Sciences, University of Texas, Austin, Texas
| | - Terese Zidon
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri
| | - E Matthew Morris
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; Medicine Division of GI and Hepatology, University of Missouri, Columbia, Missouri; and
| | - Grace M E Meers
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; Medicine Division of GI and Hepatology, University of Missouri, Columbia, Missouri; and
| | - John P Thyfault
- Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; Medicine Division of GI and Hepatology, University of Missouri, Columbia, Missouri; and Research Service, Harry S. Truman Memorial VA Hospital, Columbia, Missouri
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27
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Terada K, Izumo N, Suzuki B, Karube Y, Morikawa T, Ishibashi Y, Kameyama T, Chiba K, Sasaki N, Iwata K, Matsuzaki H, Manabe T. Fluvoxamine moderates reduced voluntary activity following chronic dexamethasone infusion in mice via recovery of BDNF signal cascades. Neurochem Int 2014; 69:9-13. [PMID: 24582626 DOI: 10.1016/j.neuint.2014.02.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 01/31/2014] [Accepted: 02/14/2014] [Indexed: 10/25/2022]
Abstract
Major depression is a complex disorder characterized by genetic and environmental interactions. Selective serotonin reuptake inhibitors (SSRIs) effectively treat depression. Neurogenesis following chronic antidepressant treatment activates brain derived neurotrophic factor (BDNF) signaling. In this study, we analyzed the effects of the SSRI fluvoxamine (Flu) on locomotor activity and forced-swim behavior using chronic dexamethasone (cDEX) infusions in mice, which engenders depression-like behavior. Infusion of cDEX decreased body weight and produced a trend towards lower locomotor activity during darkness. In the forced-swim test, cDEX-mice exhibited increased immobility times compared with mice administered saline. Flu treatment reversed decreased locomotor activity and mitigated forced-swim test immobility. Real-time polymerase chain reactions using brain RNA samples yielded significantly lower BDNF mRNA levels in cDEX-mice compared with the saline group. Endoplasmic reticulum stress-associated X-box binding protein-1 (XBP1) gene expression was lower in cDEX-mice compared with the saline group. However, marked expression of the XBP1 gene was observed in cDEX-mice treated with Flu compared with mice given saline and untreated cDEX-mice. Expression of 5-HT2A and Sigma-1 receptors decreased after cDEX infusion compared with the saline group, and these decreases normalized to control levels upon Flu treatment. Our results indicate that the Flu moderates reductions in voluntary activity following chronic dexamethasone infusions in mice via recovery of BDNF signal cascades.
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Affiliation(s)
- Kazuki Terada
- Department of Clinical Pharmacology, Faculty of Pharmaceutical Science, Yokohama College of Pharmacy, 601 Matano-cho, Totsuka-ku, Yokohama, Kanagawa 245-0066, Japan; Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka 814-0180, Japan
| | - Nobuo Izumo
- Department of Clinical Pharmacology, Faculty of Pharmaceutical Science, Yokohama College of Pharmacy, 601 Matano-cho, Totsuka-ku, Yokohama, Kanagawa 245-0066, Japan.
| | - Biora Suzuki
- Department of Clinical Pharmacology, Faculty of Pharmaceutical Science, Yokohama College of Pharmacy, 601 Matano-cho, Totsuka-ku, Yokohama, Kanagawa 245-0066, Japan
| | - Yoshiharu Karube
- Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka 814-0180, Japan
| | - Tomomi Morikawa
- Division of Gene Expression Mechanisms, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan
| | - Yukiko Ishibashi
- Department of Biochemistry, Faculty of Pharmaceutical Science, Yokohama College of Pharmacy, 601 Matano-cho, Totsuka-Ku, Yokohama, Kanagawa 245-0066, Japan; Division of Development Higher Brain Functions (University of Fukui), United Graduate School of Child Development, Osaka University, Kanazawa University and Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan
| | - Toshiki Kameyama
- Division of Gene Expression Mechanisms, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan
| | - Koji Chiba
- Department of Clinical Pharmacology, Faculty of Pharmaceutical Science, Yokohama College of Pharmacy, 601 Matano-cho, Totsuka-ku, Yokohama, Kanagawa 245-0066, Japan
| | - Noriko Sasaki
- Division of Gene Expression Mechanisms, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan
| | - Keiko Iwata
- Division of Development Higher Brain Functions (University of Fukui), United Graduate School of Child Development, Osaka University, Kanazawa University and Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan
| | - Hideo Matsuzaki
- Division of Development Higher Brain Functions (University of Fukui), United Graduate School of Child Development, Osaka University, Kanazawa University and Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan
| | - Takayuki Manabe
- Division of Gene Expression Mechanisms, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
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28
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Marks KA, Kitson AP, Shaw B, Mutch DM, Stark KD. Stearoyl-CoA desaturase 1, elongase 6 and their fatty acid products and precursors are altered in ovariectomized rats with 17β-estradiol and progesterone treatment. Prostaglandins Leukot Essent Fatty Acids 2013; 89:89-96. [PMID: 23777599 DOI: 10.1016/j.plefa.2013.05.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 05/09/2013] [Accepted: 05/17/2013] [Indexed: 10/26/2022]
Abstract
Sex differences in monounsaturated fatty acid (MUFA) levels suggest ovarian hormones may affect MUFA biosynthesis. Sprague-Dawley rats (8 weeks of age) were ovariectomized or sham operated with ovariectomized rats implanted with a constant-release hormone pellet providing 17β-estradiol, progesterone, both or neither at 10 weeks of age. After 14 days, rats were fasted overnight and sacrificed to collect plasma and livers for analysis. Hepatic stearoyl-CoA desaturase (SCD1) expression was unchanged between ovariectomized and sham controls, as determined by microarray and immunoblotting. However, SCD1 protein was increased in rats treated with estradiol plus progesterone. Elongase 6 protein levels were increased with 17β-estradiol treatment compared with sham. Rats treated with 17β-estradiol and 17β-estradiol plus progesterone had increased 16:0, 18:0, 16:1n-7 and 18:1n-7 in hepatic and plasma phospholipids. Ovarian hormones appear to be involved with MUFA biosynthesis, but the relationship appears complex and involves elongase 6 and SCD1.
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Affiliation(s)
- Kristin A Marks
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada, N2L 3G1
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29
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Shi C, Zheng DD, Fang L, Wu F, Kwong WH, Xu J. Ginsenoside Rg1 promotes nonamyloidgenic cleavage of APP via estrogen receptor signaling to MAPK/ERK and PI3K/Akt. Biochim Biophys Acta Gen Subj 2011; 1820:453-60. [PMID: 22178929 DOI: 10.1016/j.bbagen.2011.12.005] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 11/28/2011] [Accepted: 12/05/2011] [Indexed: 12/19/2022]
Abstract
BACKGROUND The pathogenic accumulation of amyloid β peptide (Aβ), a natural occurring peptide processed from beta-amyloid precursor protein (APP), is considered to play a key role in the development of Alzheimer's disease (AD). Ginsenoside Rg1, an active component in ginseng, has been identified as a phytoestrogen and also found to be neuroprotective. However, it is unknown whether Rg1-induced estrogenic activity intervenes in APP processing, and improves memory performance. METHODS Using HT22 cells and SH-SY5Y cells stably expressing the Swedish mutant APP (APPsw), this study investigated whether Rg1 intervened in APP metabolism through estrogenic activity. Using the ovariectomized (OVX) rats to mimic age-related changes in postmenopausal females, this study also tested the long-term effect of Rg1 on APP metabolism. RESULTS The in vitro study demonstrated that Rg1 increased extracellular secretion of soluble amyloid precursor protein α (sAPPα), enhanced α-secretase activity and decreased extracellular release of Aβ. These effects of Rg1 could be prevented by inhibitors of protein kinase C (PKC), Extracellular-Signal Regulated Kinase/Mitogen-Activated Protein Kinase (ERK/MAPK) and Phosphoinositide-3 kinase (PI3K)/Akt pathways. Inhibition of endogenous estrogen receptor (ER) activity abrogated Rg1-triggered release of sAPPα, increase of α-secretase activity, and activation of ERK and Akt signaling. In addition, Rg1 promoted phosphorylation of ERα at Ser118 residue. The in vivo study demonstrated that 8-week Rg1 treatment of OVX rats increased sAPPα levels and decreased Aβ content in the hippocampi, and improved the spatial learning and memory. GENERAL SIGNIFICANCE Rg1 might be used to slow or prevent AD, in particular in postmenopausal females.
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Affiliation(s)
- Chun Shi
- Department of Anatomy, Guangzhou Medical University, Guangzhou 510182, China
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