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Nakamura T, Dinh TH, Asai M, Nishimaru H, Matsumoto J, Setogawa T, Ichijo H, Honda S, Yamada H, Mihara T, Nishijo H. Characteristics of auditory steady-state responses to different click frequencies in awake intact macaques. BMC Neurosci 2022; 23:57. [PMID: 36180823 PMCID: PMC9524006 DOI: 10.1186/s12868-022-00741-9] [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: 05/26/2022] [Accepted: 09/13/2022] [Indexed: 11/28/2022] Open
Abstract
Background Auditory steady-state responses (ASSRs) are periodic evoked responses to constant periodic auditory stimuli, such as click trains, and are suggested to be associated with higher cognitive functions in humans. Since ASSRs are disturbed in human psychiatric disorders, recording ASSRs from awake intact macaques would be beneficial to translational research as well as an understanding of human brain function and its pathology. However, ASSR has not been reported in awake macaques. Results Electroencephalograms (EEGs) were recorded from awake intact macaques, while click trains at 20–83.3 Hz were binaurally presented. EEGs were quantified based on event-related spectral perturbation (ERSP) and inter-trial coherence (ITC), and ASSRs were significantly demonstrated in terms of ERSP and ITC in awake intact macaques. A comparison of ASSRs among different click train frequencies indicated that ASSRs were maximal at 83.3 Hz. Furthermore, analyses of laterality indices of ASSRs showed that no laterality dominance of ASSRs was observed. Conclusions The present results demonstrated ASSRs, comparable to those in humans, in awake intact macaques. However, there were some differences in ASSRs between macaques and humans: macaques showed maximal ASSR responses to click frequencies higher than 40 Hz that has been reported to elicit maximal responses in humans, and showed no dominant laterality of ASSRs under the electrode montage in this study compared with humans with right hemisphere dominance. The future ASSR studies using awake intact macaques should be aware of these differences, and possible factors, to which these differences were ascribed, are discussed. Supplementary Information The online version contains supplementary material available at 10.1186/s12868-022-00741-9.
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Affiliation(s)
- Tomoya Nakamura
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Department of Anatomy, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Trong Ha Dinh
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Department of Physiology, Vietnam Military Medical University, Hanoi, 100000, Vietnam
| | - Makoto Asai
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hiroshi Nishimaru
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Jumpei Matsumoto
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Tsuyoshi Setogawa
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Hiroyuki Ichijo
- Department of Anatomy, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Sokichi Honda
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hiroshi Yamada
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Takuma Mihara
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hisao Nishijo
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan. .,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan.
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2
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Bukhtiyarova O, Chauvette S, Seigneur J, Timofeev I. Brain states in freely behaving marmosets. Sleep 2022; 45:6586531. [PMID: 35576961 PMCID: PMC9366652 DOI: 10.1093/sleep/zsac106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/26/2022] [Indexed: 11/12/2022] Open
Abstract
Study Objectives We evaluated common marmosets as a perspective animal model to study human sleep and wake states. Methods Using wireless neurologger recordings, we performed longitudinal multichannel local field potential (LFP) cortical, hippocampal, neck muscle, and video recordings in three freely behaving marmosets. The brain states were formally identified using self-organizing maps. Results Marmosets were generally awake during the day with occasional 1–2 naps, and they slept during the night. Major electrographic patterns fall in five clearly distinguished categories: wakefulness, drowsiness, light and deep NREM sleep, and REM. Marmosets typically had 14–16 sleep cycles per night, with either gradually increasing or relatively low, but stable delta power within the cycle. Overall, the delta power decreased throughout the night sleep. Marmosets demonstrated prominent high amplitude somatosensory mu-rhythm (10–15 Hz), accompanied with neocortical ripples, and alternated with occipital alpha rhythm (10–15 Hz). NREM sleep was characterized with the presence of high amplitude slow waves, sleep spindles and ripples in neocortex, and sharp-wave-ripple complexes in CA1. Light and deep stages differed in levels of delta and sigma power and muscle tone. REM sleep was defined with low muscle tone and activated LFP with predominant beta-activity and rare spindle-like or mu-like events. Conclusions Multiple features of sleep–wake state distribution and electrographic patterns associated with behavioral states in marmosets closely match human states, although marmoset have shorter sleep cycles. This demonstrates that marmosets represent an excellent model to study origin of human electrographical rhythms and brain states.
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Affiliation(s)
- Olga Bukhtiyarova
- Department of Psychiatry and Neuroscience, School of Medicine, Université Laval , Québec (Québec) , Canada
- CERVO Brain Research Centre , Québec (Québec) , Canada
| | | | | | - Igor Timofeev
- Department of Psychiatry and Neuroscience, School of Medicine, Université Laval , Québec (Québec) , Canada
- CERVO Brain Research Centre , Québec (Québec) , Canada
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3
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Brown AMC, Gervais NJ. Role of Ovarian Hormones in the Modulation of Sleep in Females Across the Adult Lifespan. Endocrinology 2020; 161:5879359. [PMID: 32735650 PMCID: PMC7450669 DOI: 10.1210/endocr/bqaa128] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/22/2020] [Indexed: 12/13/2022]
Abstract
Ovarian hormones, including 17β-estradiol, are implicated in numerous physiological processes, including sleep. Beginning at puberty, girls report more sleep complaints than boys, which is maintained throughout the reproductive life stage. Sleep problems are exacerbated during the menopausal transition, evidenced by greater risk for sleep disorders. There is emerging evidence that menopause-associated hormone loss contributes to this elevated risk, but age is also an important factor. The extent to which menopause-associated sleep disturbance persists into postmenopause above and beyond the effects of age remains unknown. Untreated sleep disturbances have important implications for cognitive health, as they are emerging as risk factors for dementia. Given that sleep loss impairs memory, an important knowledge gap concerns the role played by menopause-associated hormone loss in exacerbating sleep disturbance and, ultimately, cognitive function in aging women. In this review, we take a translational approach to illustrate the contribution of ovarian hormones in maintaining the sleep-wake cycle in younger and middle-aged females, with evidence implicating 17β-estradiol in supporting the memory-promoting effects of sleep. Sleep physiology is briefly reviewed before turning to behavioral and neural evidence from young females linking 17β-estradiol to sleep-wake cycle maintenance. Implications of menopause-associated 17β-estradiol loss is also reviewed before discussing how ovarian hormones may support the memory-promoting effects of sleep, and why menopause may exacerbate pathological aging via effects on sleep. While still in its infancy, this research area offers a new sex-based perspective on aging research, with a focus on a modifiable risk factor for pathological aging.
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Affiliation(s)
- Alana M C Brown
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
| | - Nicole J Gervais
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
- Correspondence: Nicole J. Gervais, University of Toronto, Department of Psychology, 100 St. George Street, Toronto, ON, Canada M5S 3G3. E-mail:
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4
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Nakamura T, Dinh TH, Asai M, Nishimaru H, Matsumoto J, Takamura Y, Hori E, Honda S, Yamada H, Mihara T, Matsumoto M, Nishijo H. Non-invasive electroencephalographical (EEG) recording system in awake monkeys. Heliyon 2020; 6:e04043. [PMID: 32490247 PMCID: PMC7260294 DOI: 10.1016/j.heliyon.2020.e04043] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/29/2019] [Accepted: 05/19/2020] [Indexed: 12/03/2022] Open
Abstract
Background Human clinical studies reported that several electroencephalographical (EEG) parameters can be used as biomarkers of psychiatric disorders. EEGs recorded from non-human primates (monkeys) is useful for understanding of human pathologies of psychiatric disorders and development of new therapeutic agents. New methods In this study, we expand a previous non-invasive head holding system with face masks for awake monkeys to be applied to scalp EEG recording. The new design of a head holding system allows to attach scalp EEG electrodes on the positions comparable to human electrode placement and to present auditory stimuli. Results With this system, we could record auditory evoked potentials (AEPs) in auditory sensory gating and oddball paradigms, which are often used as biomarkers of psychiatric disorders in animal models and human patients. The recorded AEPs were comparable to previous human clinical data. Comparison with existing methods Compared with previous non-invasive head holding systems, top, side (cheek and ears), and rear of the head can be open for attachment of EEG electrodes and auditory stimulation in the present system. Conclusions The results suggest that the present system is useful in EEG recording from awake monkeys. Furthermore, this system can be applied to eye-tracking and chronic intra-cerebral recording experiments.
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Affiliation(s)
- Tomoya Nakamura
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan.,Department of Anatomy, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Trong Ha Dinh
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Makoto Asai
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki 305-8585, Japan
| | - Hiroshi Nishimaru
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Jumpei Matsumoto
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Yusaku Takamura
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Etsuro Hori
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Sokichi Honda
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki 305-8585, Japan
| | - Hiroshi Yamada
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki 305-8585, Japan
| | - Takuma Mihara
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki 305-8585, Japan
| | - Mitsuyuki Matsumoto
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki 305-8585, Japan
| | - Hisao Nishijo
- System Emotional Science, Faculty of Medicine, University of Toyama, Toyama 930-0194, Japan
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5
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Schlumbohm C, Seidlová-Wuttke D, Fuchs E. Effect of ovariectomy on proximal tibia metaphysis and lumbar vertebral body in common marmoset monkeys. Primate Biol 2020; 6:65-73. [PMID: 32110717 PMCID: PMC7041521 DOI: 10.5194/pb-6-65-2019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 05/29/2019] [Indexed: 11/13/2022] Open
Abstract
This study aimed to investigate the effect of estrogen withdrawal on bone
tissue in adult female marmoset monkeys. In a 1-year follow-up study we used
quantitative computer tomography to measure total bone mineral density (BMD)
of the proximal tibia and the second-last lumbar vertebral body (L5/L6)
before and 1, 3, 6, and 12 months after ovariectomy. Body mass did not
significantly change during the 1-year observation period. However, a
significant decline of total BMD after ovariectomy was observed in the
proximal tibia but not in L5/L6. In addition, regression analysis showed a
significant positive relationship between BMD and body mass in both tibia
and L5/L6. The results of our study support the idea that ovariectomized
marmoset monkeys may serve as a model to investigate bone loss related to
decline of estrogen production.
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Affiliation(s)
- Christina Schlumbohm
- German Primate Center, Leibniz Institute for Primate Research, 37077 Göttingen, Germany
| | - Dana Seidlová-Wuttke
- Department of Endocrinology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Eberhard Fuchs
- German Primate Center, Leibniz Institute for Primate Research, 37077 Göttingen, Germany
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Adverse Effects of Aromatase Inhibition on the Brain and Behavior in a Nonhuman Primate. J Neurosci 2018; 39:918-928. [PMID: 30587540 PMCID: PMC6382974 DOI: 10.1523/jneurosci.0353-18.2018] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 11/12/2018] [Accepted: 11/17/2018] [Indexed: 01/12/2023] Open
Abstract
Breast cancer patients using aromatase inhibitors (AIs) as an adjuvant therapy often report side effects, including hot flashes, mood changes, and cognitive impairment. Despite long-term use in humans, little is known about the effects of continuous AI administration on the brain and cognition. We used a primate model of human cognitive aging, the common marmoset, to examine the effects of a 4-week daily administration of the AI letrozole (20 μg, p.o.) on cognition, anxiety, thermoregulation, brain estrogen content, and hippocampal pyramidal cell physiology. Letrozole treatment was administered to both male and female marmosets and reduced peripheral levels of estradiol (E2), but unexpectedly increased E2 levels in the hippocampus. Spatial working memory and intrinsic excitability of hippocampal neurons were negatively affected by the treatment possibly due to increased hippocampal E2. While no changes in hypothalamic E2 were observed, thermoregulation was disrupted by letrozole in females only, indicating some impact on hypothalamic activity. These findings suggest adverse effects of AIs on the primate brain and call for new therapies that effectively prevent breast cancer recurrence while minimizing side effects that further compromise quality of life.SIGNIFICANCE STATEMENT Aromatase inhibitors (AIs) are used as an adjuvant therapy for estrogen-receptor-positive breast cancer and are associated with side effects, including hot flashes, depression/anxiety, and memory deficits severe enough for many women to discontinue this life-saving treatment. AIs are also used by men, yet sex differences in the reported side effects have not been systematically studied. We show that AI-treated male and female marmosets exhibit behavioral changes consistent with these CNS symptoms, as well as elevated hippocampal estradiol and compromised hippocampal physiology. These findings illustrate the need for (1) a greater understanding of the precise mechanisms by which AIs impact brain function and (2) the development of new treatment approaches for breast cancer patients that minimize adverse effects on the brain.
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Gervais NJ, Mong JA, Lacreuse A. Ovarian hormones, sleep and cognition across the adult female lifespan: An integrated perspective. Front Neuroendocrinol 2017; 47:134-153. [PMID: 28803147 PMCID: PMC7597864 DOI: 10.1016/j.yfrne.2017.08.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 12/22/2022]
Abstract
Loss of ovarian function in women is associated with sleep disturbances and cognitive decline, which suggest a key role for estrogens and/or progestins in modulating these symptoms. The effects of ovarian hormones on sleep and cognitive processes have been studied in separate research fields that seldom intersect. However, sleep has a considerable impact on cognitive function. Given the tight connections between sleep and cognition, ovarian hormones may influence selective aspects of cognition indirectly, via the modulation of sleep. In support of this hypothesis, a growing body of evidence indicates that the development of sleep disorders following menopause contributes to accelerated cognitive decline and dementia in older women. This paper draws from both the animal and human literature to present an integrated view of the effects of ovarian hormones on sleep and cognition across the adult female lifespan.
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Affiliation(s)
- Nicole J Gervais
- Department of Psychological and Brain Sciences, University of Massachusetts, Amherst, 135 Hicks Way, Amherst, MA 01003, United States.
| | - Jessica A Mong
- Department of Pharmacology, University of Maryland School of Medicine, 655 West Baltimore Street, Baltimore, MD 21201, United States
| | - Agnès Lacreuse
- Department of Psychological and Brain Sciences, University of Massachusetts, Amherst, 135 Hicks Way, Amherst, MA 01003, United States
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Krull AA, Larsen SA, Clifton DK, Neal-Perry G, Steiner RA. A Comprehensive Method To Quantify Adaptations by Male and Female Mice With Hot Flashes Induced by the Neurokinin B Receptor Agonist Senktide. Endocrinology 2017; 158:3259-3268. [PMID: 28531316 PMCID: PMC5659681 DOI: 10.1210/en.2017-00142] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 05/17/2017] [Indexed: 12/27/2022]
Abstract
Vasomotor symptoms (VMS; or hot flashes) plague millions of reproductive-aged men and women who have natural or iatrogenic loss of sex steroid production. Many affected individuals are left without treatment options because of contraindications to hormone replacement therapy and the lack of equally effective nonhormonal alternatives. Moreover, development of safer, more effective therapies has been stymied by the lack of an animal model that recapitulates the hot-flash phenomenon and enables direct testing of hypotheses regarding the pathophysiology underlying hot flashes. To address these problems, we developed a murine model for hot flashes and a comprehensive method for measuring autonomic and behavioral thermoregulation in mice. We designed and constructed an instrument called a thermocline that produces a thermal gradient along which mice behaviorally adapt to a thermal challenge to their core body temperature set point while their thermal preference over time is tracked and recorded. We tested and validated this murine model for VMS by administration of a TRPV1 agonist and a neurokinin B receptor agonist, capsaicin and senktide, respectively, to unrestrained mice and observed their autonomic and behavioral responses. Following both treatments, the mice exhibited a VMS-like response characterized by a drop in core body temperature and cold-seeking behavior on the thermocline. Senktide also caused a rise in tail skin temperature and increased Fos expression in the median preoptic area, a hypothalamic temperature control center. This dynamic model may be used to fully explore the cellular and molecular bases for VMS and to develop and test new therapeutic options.
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Affiliation(s)
- Ashley A. Krull
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington 98195
- Department of Physiology & Biophysics, University of Washington, Seattle, Washington 98195
- Graduate Program in Neuroscience, University of Washington, Seattle, Washington 98195
| | - Sarah A. Larsen
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington 98195
| | - Donald K. Clifton
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington 98195
| | - Genevieve Neal-Perry
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington 98195
| | - Robert A. Steiner
- Department of Obstetrics & Gynecology, University of Washington, Seattle, Washington 98195
- Department of Physiology & Biophysics, University of Washington, Seattle, Washington 98195
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