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Wang H, Hu J, Hu J, Chen Q, Shang N, Liu M, Li X, Xiang L, Yin D, Lan J, Xiao Q, Peng Y. Antidepressant effect of 4-Butyl-a-agarofuran via HPA axis and serotonin system. Brain Res Bull 2023; 198:3-14. [PMID: 37076049 DOI: 10.1016/j.brainresbull.2023.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/22/2023] [Accepted: 04/16/2023] [Indexed: 04/21/2023]
Abstract
Depression is a leading cause of disability worldwide and the psychiatric diagnosis most commonly associated with suicide. 4-Butyl-a-agarofuran (AF-5), a derivative of agarwood furan, is currently in phase III clinical trials for generalized anxiety disorder. Herein, we explored the antidepressant effect and its possible neurobiological mechanisms in animal models. In present study, AF-5 administration markedly decreased the immobility time in mouse forced swim test and tail suspension test. In the sub-chronic reserpine-induced depressive rats, AF-5 treatment markedly increased the rectal temperature and decreased the immobility time of model rats. In addition, chronic AF-5 treatment markedly reversed the depressive-like behaviors in chronic unpredictable mild stress (CUMS) rats by reducing immobility time of forced swim test. Single treatment with AF-5 also potentiated the mouse head-twitch response induced by 5-hydroxytryptophan (5-HTP, a metabolic precursor to serotonin), and antagonized the ptosis and motor ability triggered by reserpine. However, AF-5 had no effect on yohimbine toxicity in mice. These results indicated that acute treatment with AF-5 produced serotonergic, but not noradrenergic activation. Furthermore, AF-5 reduced adrenocorticotropic hormone (ACTH) level in serum and normalized the neurotransmitter changes, including the decreased serotonin (5-HT) in hippocampus of CUMS rats. Moreover, AF-5 affected the expressions of CRFR1 and 5-HT2C receptor in CUMS rats. These findings confirm the antidepressant effect of AF-5 in animal models, which may be primarily related to CRFR1 and 5-HT2C receptor. AF-5 appears to be promising as a novel dual target drug for depression treatment.
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Affiliation(s)
- Hongyue Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Jinping Hu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Jiahuan Hu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Qiuyu Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Nianying Shang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Mengyao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Xinnan Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Longgang Xiang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Dali Yin
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China
| | - Jiaqi Lan
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China.
| | - Qiong Xiao
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China.
| | - Ying Peng
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College. No.1, Xiannongtan Street, Xicheng District, Beijing 100050, China.
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Mehranfard D, Linares A, Chabbra A, Campos G, de Souza AMA, Ji H, West C, Sandberg K, Speth RC. Preliminary study of ovariectomy and chronic losartan-induced alterations in brain AT 1 receptors. Brain Res 2021; 1766:147520. [PMID: 33991491 DOI: 10.1016/j.brainres.2021.147520] [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: 01/03/2021] [Revised: 05/03/2021] [Accepted: 05/08/2021] [Indexed: 11/19/2022]
Abstract
Women who undergo oophorectomy prior to the age of natural menopause have a higher risk of neurological and psychological impairment. Treatment with the angiotensin receptor blocker (ARB) losartan for 10 weeks following ovariectomy of Long-Evans rats at 3 months of age reduced the ovariectomy-induced cognitive decrements. Following completion of the behavioral experiments, (Campos et al., 2019), the brains were harvested for preliminary receptor autoradiographic studies of AT1 receptor (AT1R) binding in selected brain regions using quantitative densitometric analysis of autoradiograms of 125I-sarcosine1, isoleucine8 angiotensin II binding. Four of the brain regions (amygdala, ventral subiculum, piriform cortex, and cingulate cortex) are associated with cognitive and emotional behavior while one (lateral hypothalamus) is associated with homeostasis. The density of AT1R varied by region: ventral subiculum > amygdala and cingulate cortex, and piriform cortex > cingulate cortex. Losartan treatment decreased AT1R binding in the ventral subiculum of sham and ovariectomized rats by 41.6%, and 46% in the piriform cortex of the sham rats, but tended to increase AT1R binding in the piriform cortex and cingulate cortex 77% and 107%, respectively, in the ovariectomized rats. AT1R binding did not differ significantly between intact male and sham-vehicle female rats among surveyed brain regions. These results suggest that losartan-induced changes in brain AT1R expression may contribute to the reduced anxiety-like behavior and memory impairments seen in ovariectomized rats, but replication of these observations will be needed to determine the extent to which brain AT1R changes mediate the adverse behavioral effects of ovariectomy.
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Affiliation(s)
- Danial Mehranfard
- College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, United States
| | - Andrea Linares
- College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, United States
| | - Alesa Chabbra
- College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, United States
| | - Glenda Campos
- Department of Biological Sciences, Federal University of Ouro Preto, Ouro Preto, Brazil
| | - Aline M A de Souza
- Department of Medicine, School of Medicine, Georgetown University, Washington, DC, United States
| | - Hong Ji
- Department of Medicine, School of Medicine, Georgetown University, Washington, DC, United States
| | - Crystal West
- Department of Biology, Appalachian State University, Kannapolis, NC, United States
| | - Kathryn Sandberg
- Department of Medicine, School of Medicine, Georgetown University, Washington, DC, United States
| | - Robert C Speth
- College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, United States; Department of Pharmacology and Physiology, School of Medicine, Georgetown University, Washington, DC, United States.
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Wang L, Zhang Z, Chen J, Manyande A, Haddad R, Liu Q, Xu F. Cell-Type-Specific Whole-Brain Direct Inputs to the Anterior and Posterior Piriform Cortex. Front Neural Circuits 2020; 14:4. [PMID: 32116571 PMCID: PMC7019026 DOI: 10.3389/fncir.2020.00004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 01/21/2020] [Indexed: 12/20/2022] Open
Abstract
The piriform cortex (PC) is a key brain area involved in both processing and coding of olfactory information. It is implicated in various brain disorders, such as epilepsy, Alzheimer’s disease, and autism. The PC consists of the anterior (APC) and posterior (PPC) parts, which are different anatomically and functionally. However, the direct input networks to specific neuronal populations within the APC and PPC remain poorly understood. Here, we mapped the whole-brain direct inputs to the two major neuronal populations, the excitatory glutamatergic principal neurons and inhibitory γ-aminobutyric acid (GABA)-ergic interneurons within the APC and PPC using the rabies virus (RV)-mediated retrograde trans-synaptic tracing system. We found that for both types of neurons, APC and PPC share some similarities in input networks, with dominant inputs originating from the olfactory region (OLF), followed by the cortical subplate (CTXsp), isocortex, cerebral nuclei (CNU), hippocampal formation (HPF) and interbrain (IB), whereas the midbrain (MB) and hindbrain (HB) were rarely labeled. However, APC and PPC also show distinct features in their input distribution patterns. For both types of neurons, the input proportion from the OLF to the APC was higher than that to the PPC; while the PPC received higher proportions of inputs from the HPF and CNU than the APC did. Overall, our results revealed the direct input networks of both excitatory and inhibitory neuronal populations of different PC subareas, providing a structural basis to analyze the diverse PC functions.
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Affiliation(s)
- Li Wang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.,Center for Brain Science, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
| | - Zhijian Zhang
- Center for Brain Science, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
| | - Jiacheng Chen
- College of Life Sciences, Wuhan University, Wuhan, China
| | - Anne Manyande
- School of Human and Social Sciences, University of West London, Middlesex, United Kingdom
| | - Rafi Haddad
- The Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Qing Liu
- Center for Brain Science, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China.,University of the Chinese Academy of Sciences, Beijing, China
| | - Fuqiang Xu
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.,Center for Brain Science, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China.,University of the Chinese Academy of Sciences, Beijing, China.,Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.,Shenzhen Key Lab of Neuropsychiatric Modulation and Collaborative Innovation Center for Brain Science, Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China
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Serotonergic afferents from the dorsal raphe decrease the excitability of pyramidal neurons in the anterior piriform cortex. Proc Natl Acad Sci U S A 2020; 117:3239-3247. [PMID: 31992641 DOI: 10.1073/pnas.1913922117] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The olfactory system receives extensive serotonergic inputs from the dorsal raphe, a nucleus involved in control of behavior, regulation of mood, and modulation of sensory processing. Although many studies have investigated how serotonin modulates the olfactory bulb, few have focused on the anterior piriform cortex (aPC), a region important for olfactory learning and encoding of odor identity and intensity. Specifically, the mechanism and functional significance of serotonergic modulation of the aPC remain largely unknown. Here we used pharmacologic, optogenetic, and fiber photometry techniques to examine the serotonergic modulation of neural activity in the aPC in vitro and in vivo. We found that serotonin (5-HT) reduces the excitability of pyramidal neurons directly via 5-HT2C receptors, phospholipase C, and calcium-activated potassium (BK) channels. Furthermore, endogenous serotonin attenuates odor-evoked calcium responses in aPC pyramidal neurons. These findings identify the mechanism underlying serotonergic modulation of the aPC and shed light on its potential role.
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Marin P, Bécamel C, Chaumont-Dubel S, Vandermoere F, Bockaert J, Claeysen S. Classification and signaling characteristics of 5-HT receptors: toward the concept of 5-HT receptosomes. HANDBOOK OF BEHAVIORAL NEUROSCIENCE 2020. [DOI: 10.1016/b978-0-444-64125-0.00005-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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CRF Mediates Stress-Induced Pathophysiological High-Frequency Oscillations in Traumatic Brain Injury. eNeuro 2019; 6:ENEURO.0334-18.2019. [PMID: 31040158 PMCID: PMC6514440 DOI: 10.1523/eneuro.0334-18.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 04/01/2019] [Accepted: 04/20/2019] [Indexed: 01/19/2023] Open
Abstract
It is not known why there is increased risk to have seizures with increased anxiety and stress after traumatic brain injury (TBI). Stressors cause the release of corticotropin-releasing factor (CRF) both from the hypothalamic pituitary adrenal (HPA) axis and from CNS neurons located in the central amygdala and GABAergic interneurons. We have previously shown that CRF signaling is plastic, becoming excitatory instead of inhibitory after the kindling model of epilepsy. Here, using Sprague Dawley rats we have found that CRF signaling increased excitability after TBI. Following TBI, CRF type 1 receptor (CRFR1)-mediated activity caused abnormally large electrical responses in the amygdala, including fast ripples, which are considered to be epileptogenic. After TBI, we also found the ripple (120-250 Hz) and fast ripple activity (>250 Hz) was cross-frequency coupled with θ (3-8 Hz) oscillations. CRFR1 antagonists reduced the incidence of phase coupling between ripples and fast ripples. Our observations indicate that pathophysiological signaling of the CRFR1 increases the incidence of epileptiform activity after TBI. The use for CRFR1 antagonist may be useful to reduce the severity and frequency of TBI associated epileptic seizures.
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Perim RR, Fields DP, Mitchell GS. Protein kinase Cδ constrains the S-pathway to phrenic motor facilitation elicited by spinal 5-HT 7 receptors or severe acute intermittent hypoxia. J Physiol 2018; 597:481-498. [PMID: 30382587 DOI: 10.1113/jp276731] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 10/31/2018] [Indexed: 12/11/2022] Open
Abstract
KEY POINTS Concurrent 5-HT2A (Q pathway) and 5-HT7 (S pathway) serotonin receptor activation cancels phrenic motor facilitation due to mutual cross-talk inhibition. Spinal protein kinase Cδ (PKCδ) or protein kinase A inhibition restores phrenic motor facilitation with concurrent Q and S pathway activation, demonstrating a key role for these kinases in cross-talk inhibition. Spinal PKCδ inhibition enhances adenosine-dependent severe acute intermittent hypoxia-induced phrenic long-term facilitation (S pathway), consistent with relief of cross-talk inhibition. ABSTRACT Intermittent spinal serotonin receptor activation elicits long-lasting phrenic motor facilitation (pMF), a form of respiratory motor plasticity. When activated alone, spinal Gq protein-coupled serotonin 2A receptors (5-HT2A ) initiate pMF by a mechanism that requires ERK-MAP kinase signalling and new BDNF protein synthesis (Q pathway). Spinal Gs protein-coupled serotonin 7 (5-HT7 ) and adenosine 2A (A2A ) receptor activation also elicits pMF, but via distinct mechanisms (S pathway) that require Akt signalling and new TrkB protein synthesis. Although studies have shown inhibitory cross-talk interactions between these competing pathways, the underlying cellular mechanisms are unknown. We propose the following hypotheses: (1) concurrent 5-HT2A and 5-HT7 activation undermines pMF; (2) protein kinase A (PKA) and (3) NADPH oxidase mediate inhibitory interactions between Q (5-HT2A ) and S (5-HT7 ) pathways. Selective 5-HT2A (DOI hydrochloride) and 5HT7 (AS-19) agonists were administered intrathecally at C4 (three injections, 5-min intervals) in anaesthetized, vagotomized and ventilated male rats. With either spinal 5-HT2A or 5-HT7 activation alone, phrenic amplitude progressively increased (pMF). In contrast, concurrent 5-HT2A and 5-HT7 activation failed to elicit pMF. The 5-HT2A -induced Q pathway was restored by inhibiting PKA activity (Rp-8-Br-cAMPS). NADPH oxidase inhibition did not prevent cross-talk inhibition. Therefore, we investigated alternative mechanisms to explain Q to S pathway inhibition. Spinal protein kinase C (PKC) inhibition with Gö6983 or PKCδ peptide inhibitor restored the 5-HT7 -induced S pathway to pMF, revealing PKCδ as the relevant isoform. Spinal PKCδ inhibition enhanced the S pathway-dependent form of pMF elicited by severe acute intermittent hypoxia. We suggest that powerful constraints between 5-HT2A and 5-HT7 or A2A receptor-induced pMF are mediated by PKCδ and PKA, respectively.
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Affiliation(s)
- Raphael R Perim
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Daryl P Fields
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Gordon S Mitchell
- Center for Respiratory Research and Rehabilitation, Department of Physical Therapy and McKnight Brain Institute, University of Florida, Gainesville, FL, USA
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Campolongo M, Kazlauskas N, Falasco G, Urrutia L, Salgueiro N, Höcht C, Depino AM. Sociability deficits after prenatal exposure to valproic acid are rescued by early social enrichment. Mol Autism 2018; 9:36. [PMID: 29946415 PMCID: PMC6001054 DOI: 10.1186/s13229-018-0221-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/31/2018] [Indexed: 12/28/2022] Open
Abstract
Background Autism spectrum disorder (ASD) is characterized by impaired social interactions and repetitive patterns of behavior. Symptoms appear in early life and persist throughout adulthood. Early social stimulation can help reverse some of the symptoms, but the biological mechanisms of these therapies are unknown. By analyzing the effects of early social stimulation on ASD-related behavior in the mouse, we aimed to identify brain structures that contribute to these behaviors. Methods We injected pregnant mice with 600-mg/kg valproic acid (VPA) or saline (SAL) at gestational day 12.5 and evaluated the effect of weaning their offspring in cages containing only VPA animals, only SAL animals, or mixed. We analyzed juvenile play at PD21 and performed a battery of behavioral tests in adulthood. We then used preclinical PET imaging for an unbiased analysis of the whole brain of these mice and studied the function of the piriform cortex by c-Fos immunoreactivity and HPLC. Results Compared to control animals, VPA-exposed animals play less as juveniles and exhibit a lower frequency of social interaction in adulthood when reared with other VPA mice. In addition, these animals were less likely to investigate social odors in the habituation/dishabituation olfactory test. However, when VPA animals were weaned with control animals, these behavioral alterations were not observed. Interestingly, repetitive behaviors and depression-related behaviors were not affected by social enrichment. We also found that VPA animals present high levels of glucose metabolism bilaterally in the piriform cortex (Pir), a region known to be involved in social behaviors. Moreover, we found alterations in the somatosensory, motor, and insular cortices. Remarkably, these effects were mostly reversed after social stimulation. To evaluate if changes in glucose metabolism in the Pir correlated with changes in neuronal activity, we measured c-Fos immunoreactivity in the Pir and found it increased in animals prenatally exposed to VPA. We further found increased dopamine turnover in the Pir. Both alterations were largely reversed by social enrichment. Conclusions We show that early social enrichment can specifically rescue social deficits in a mouse model of ASD. Our results identified the Pir as a structure affected by VPA-exposure and social enrichment, suggesting that it could be a key component of the social brain circuitry. Electronic supplementary material The online version of this article (10.1186/s13229-018-0221-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Marcos Campolongo
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Buenos Aires, Argentina.,2CONICET-Universidad de Buenos Aires, Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Buenos Aires, Argentina
| | - Nadia Kazlauskas
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Buenos Aires, Argentina.,2CONICET-Universidad de Buenos Aires, Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Buenos Aires, Argentina
| | - German Falasco
- 3FLENI, Centro de Imágenes Moleculares, Laboratorio de Imágenes Preclínicas, Buenos Aires, Argentina
| | - Leandro Urrutia
- 3FLENI, Centro de Imágenes Moleculares, Laboratorio de Imágenes Preclínicas, Buenos Aires, Argentina
| | - Natalí Salgueiro
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Buenos Aires, Argentina.,2CONICET-Universidad de Buenos Aires, Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Buenos Aires, Argentina
| | - Christian Höcht
- 4Facultad de Farmacia y Bioquímica, Cátedra de Farmacología, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Amaicha Mara Depino
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Buenos Aires, Argentina.,2CONICET-Universidad de Buenos Aires, Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Buenos Aires, Argentina.,5UBA-CONICET, Ciudad Universitaria, Int. Guiraldes 2160, Pabellon 2, Ciudad de Buenos Aires, Argentina
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BK Channels Mediate Synaptic Plasticity Underlying Habituation in Rats. J Neurosci 2017; 37:4540-4551. [PMID: 28348135 DOI: 10.1523/jneurosci.3699-16.2017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 03/17/2017] [Accepted: 03/21/2017] [Indexed: 11/21/2022] Open
Abstract
Habituation is a basic form of implicit learning and represents a sensory filter that is disrupted in autism, schizophrenia, and several other mental disorders. Despite extensive research in the past decades on habituation of startle and other escape responses, the underlying neural mechanisms are still not fully understood. There is evidence from previous studies indicating that BK channels might play a critical role in habituation. We here used a wide array of approaches to test this hypothesis. We show that BK channel activation and subsequent phosphorylation of these channels are essential for synaptic depression presumably underlying startle habituation in rats, using patch-clamp recordings and voltage-sensitive dye imaging in slices. Furthermore, positive modulation of BK channels in vivo can enhance short-term habituation. Although results using different approaches do not always perfectly align, together they provide convincing evidence for a crucial role of BK channel phosphorylation in synaptic depression underlying short-term habituation of startle. We also show that this mechanism can be targeted to enhance short-term habituation and therefore to potentially ameliorate sensory filtering deficits associated with psychiatric disorders.SIGNIFICANCE STATEMENT Short-term habituation is the most fundamental form of implicit learning. Habituation also represents a filter for inundating sensory information, which is disrupted in autism, schizophrenia, and other psychiatric disorders. Habituation has been studied in different organisms and behavioral models and is thought to be caused by synaptic depression in respective pathways. The underlying molecular mechanisms, however, are poorly understood. We here identify, for the first time, a BK channel-dependent molecular synaptic mechanism leading to synaptic depression that is crucial for habituation, and we discuss the significance of our findings for potential treatments enhancing habituation.
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Narla C, Scidmore T, Jeong J, Everest M, Chidiac P, Poulter MO. A switch in G protein coupling for type 1 corticotropin-releasing factor receptors promotes excitability in epileptic brains. Sci Signal 2016; 9:ra60. [PMID: 27303056 DOI: 10.1126/scisignal.aad8676] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Anxiety and stress increase the frequency of epileptic seizures. These behavioral states induce the secretion of corticotropin-releasing factor (CRF), a 40-amino acid neuropeptide neurotransmitter that coordinates many behavioral responses to stress in the central nervous system. In the piriform cortex, which is one of the most seizurogenic regions of the brain, CRF normally dampens excitability. By contrast, CRF increased the excitability of the piriform cortex in rats subjected to kindling, a model of temporal lobe epilepsy. In nonkindled rats, CRF activates its receptor, a G protein (heterotrimeric guanosine triphosphate-binding protein)-coupled receptor, and signals through a Gαq/11-mediated pathway. After seizure induction, CRF signaling occurred through a pathway involving Gαs This change in signaling was associated with reduced abundance of regulator of G protein signaling protein type 2 (RGS2), which has been reported to inhibit Gαs-dependent signaling. RGS2 knockout mice responded to CRF in a similar manner as epileptic rats. These observations indicate that seizures produce changes in neuronal signaling that can increase seizure occurrence by converting a beneficial stress response into an epileptic trigger.
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Affiliation(s)
- Chakravarthi Narla
- Molecular Medicine Research Group, Robarts Research Institute, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada. Department of Physiology and Pharmacology, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Tanner Scidmore
- Molecular Medicine Research Group, Robarts Research Institute, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada. Department of Physiology and Pharmacology, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Jaymin Jeong
- Molecular Medicine Research Group, Robarts Research Institute, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada. Graduate Program in Neuroscience, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Michelle Everest
- Molecular Medicine Research Group, Robarts Research Institute, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Peter Chidiac
- Department of Physiology and Pharmacology, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 3K7, Canada. Department of Biology, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Michael O Poulter
- Molecular Medicine Research Group, Robarts Research Institute, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada. Department of Physiology and Pharmacology, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 3K7, Canada. Graduate Program in Neuroscience, Schulich School of Medicine, University of Western Ontario, London, Ontario N6A 5K8, Canada.
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PSD-95 regulates CRFR1 localization, trafficking and β-arrestin2 recruitment. Cell Signal 2016; 28:531-540. [PMID: 26898829 DOI: 10.1016/j.cellsig.2016.02.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 02/16/2016] [Accepted: 02/16/2016] [Indexed: 12/13/2022]
Abstract
Corticotropin-releasing factor (CRF) is a neuropeptide commonly associated with the hypothalamic-pituitary adrenal axis stress response. Upon release, CRF activates two G protein-coupled receptors (GPCRs): CRF receptor 1 (CRFR1) and CRF receptor 2 (CRFR2). Although both receptors contribute to mood regulation, CRFR1 antagonists have demonstrated anxiolytic and antidepressant-like properties that may be exploited in the generation of new pharmacological interventions for mental illnesses. Previous studies have demonstrated CRFR1 capable of heterologously sensitizing serotonin 2A receptor (5-HT2AR) signaling: another GPCR implicated in psychiatric disease. Interestingly, this phenomenon was dependent on Postsynaptic density 95 (PSD-95)/Disc Large/Zona Occludens (PDZ) interactions on the distal carboxyl termini of both receptors. In the current study, we demonstrate that endogenous PSD-95 can be co-immunoprecipitated with CRFR1 from cortical brain homogenate, and this interaction appears to be primarily via the PDZ-binding motif. Additionally, PSD-95 colocalizes with CRFR1 within the dendritic projections of cultured mouse neurons in a PDZ-binding motif-dependent manner. In HEK 293 cells, PSD-95 overexpression inhibited CRFR1 endocytosis, whereas PSD-95 shRNA knockdown enhanced CRFR1 endocytosis. Although PSD-95 does not appear to play a significant role in CRF-mediated cAMP or ERK1/2 signaling, PSD-95 was demonstrated to suppress β-arrestin2 recruitment: providing a potential mechanism for PSD-95's inhibition of endocytosis. In revisiting previously documented heterologous sensitization, PSD-95 shRNA knockdown did not prevent CRFR1-mediated enhancement of 5-HT2AR signaling. In conclusion, we have identified and characterized a novel functional relationship between CRFR1 and PSD-95 that may have implications in the design of new treatment strategies for mental illness.
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