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Bach EC, Ewin SE, Heaney CF, Carlson HN, Ortelli OA, Almonte AG, Chappell AM, Raab-Graham KF, Weiner JL. Chemogenetic inhibition of a monosynaptic projection from the basolateral amygdala to the ventral hippocampus selectively reduces appetitive, but not consummatory, alcohol drinking-related behaviours. Eur J Neurosci 2023; 57:1241-1259. [PMID: 36840503 PMCID: PMC10931538 DOI: 10.1111/ejn.15944] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 01/16/2023] [Accepted: 02/20/2023] [Indexed: 02/26/2023]
Abstract
Alcohol use disorder (AUD) and anxiety/stressor disorders frequently co-occur and this dual diagnosis represents a major health and economic problem worldwide. The basolateral amygdala (BLA) is a key brain region that is known to contribute to the aetiology of both disorders. Although many studies have implicated BLA hyperexcitability in the pathogenesis of AUD and comorbid conditions, relatively little is known about the specific efferent projections from this brain region that contribute to these disorders. Recent optogenetic studies have shown that the BLA sends a strong monosynaptic excitatory projection to the ventral hippocampus (vHC) and that this circuit modulates anxiety- and fear-related behaviours. However, it is not known if this pathway influences alcohol drinking-related behaviours. Here, we employed a rodent operant self-administration regimen that procedurally separates appetitive (e.g. seeking) and consummatory (e.g., drinking) behaviours, chemogenetics and brain region-specific microinjections, to determine if BLA-vHC circuitry influences alcohol and sucrose drinking-related measures. We first confirmed prior optogenetic findings that silencing this circuit reduced anxiety-like behaviours on the elevated plus maze. We then demonstrated that inhibiting the BLA-vHC pathway significantly reduced appetitive drinking-related behaviours for both alcohol and sucrose while having no effect on consummatory measures. Taken together, these findings provide the first indication that the BLA-vHC circuit may regulate appetitive reward seeking directed at alcohol and natural rewards and add to a growing body of evidence suggesting that dysregulation of this pathway may contribute to the pathophysiology of AUD and anxiety/stressor-related disorders.
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Affiliation(s)
- Eva C Bach
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Sarah E Ewin
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Chelcie F Heaney
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Hannah N Carlson
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Olivia A Ortelli
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Antoine G Almonte
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Ann M Chappell
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Kimberly F Raab-Graham
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Jeffrey L Weiner
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
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Bach EC, Kandler K. Author Correction: Long-term potentiation of glycinergic synapses by semi-natural stimulation patterns during tonotopic map refinement. Sci Rep 2021; 11:22022. [PMID: 34737432 PMCID: PMC8568932 DOI: 10.1038/s41598-021-01422-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Eva C Bach
- Departments of Neurobiology, Otolaryngology, and Bioengineering, University of Pittsburgh School of Medicine, Biomedical Science Tower 3, Rm. 10016, 3501 Fifth Avenue, Pittsburgh, PA, 15261, USA.,Department of Physiology and Pharmacology, Wake Forest School of Medicine, PTCRC, Rm. 230, 115 South Chestnut Street, Winston‑Salem, NC, 27157, USA
| | - Karl Kandler
- Departments of Neurobiology, Otolaryngology, and Bioengineering, University of Pittsburgh School of Medicine, Biomedical Science Tower 3, Rm. 10016, 3501 Fifth Avenue, Pittsburgh, PA, 15261, USA.
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Bach EC, Weiner JL. Binge-like alcohol drinking remodels the inhibitory microcircuitry of the prelimbic cortex in male and female mice. Neuropsychopharmacology 2021; 46:1859-1860. [PMID: 34285370 PMCID: PMC8429577 DOI: 10.1038/s41386-021-01103-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Accepted: 07/07/2021] [Indexed: 11/09/2022]
Affiliation(s)
- Eva C. Bach
- grid.241167.70000 0001 2185 3318Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC USA
| | - Jeffrey L. Weiner
- grid.241167.70000 0001 2185 3318Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC USA
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Heaney CF, Namjoshi SV, Uneri A, Bach EC, Weiner JL, Raab-Graham KF. Role of FMRP in rapid antidepressant effects and synapse regulation. Mol Psychiatry 2021; 26:2350-2362. [PMID: 33432187 PMCID: PMC8440195 DOI: 10.1038/s41380-020-00977-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 11/23/2020] [Accepted: 12/01/2020] [Indexed: 11/09/2022]
Abstract
Rapid antidepressants are novel treatments for major depressive disorder (MDD) and work by blocking N-methyl-D-aspartate receptors (NMDARs), which, in turn, activate the protein synthesis pathway regulated by mechanistic/mammalian target of rapamycin complex 1 (mTORC1). Our recent work demonstrates that the RNA-binding protein Fragile X Mental Retardation Protein (FMRP) is downregulated in dendrites upon treatment with a rapid antidepressant. Here, we show that the behavioral effects of the rapid antidepressant Ro-25-6981 require FMRP expression, and treatment promotes differential mRNA binding to FMRP in an mTORC1-dependent manner. Further, these mRNAs are identified to regulate transsynaptic signaling. Using a novel technique, we show that synapse formation underlying the behavioral effects of Ro-25-6981 requires GABABR-mediated mTORC1 activity in WT animals. Finally, we demonstrate that in an animal model that lacks FMRP expression and has clinical relevance for Fragile X Syndrome (FXS), GABABR activity is detrimental to the effects of Ro-25-6981. These effects are rescued with the combined therapy of blocking GABABRs and NMDARs, indicating that rapid antidepressants alone may not be an effective treatment for people with comorbid FXS and MDD.
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Affiliation(s)
- Chelcie F Heaney
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
- Wake Forest Translational Alcohol Research Center (WF-TARC), Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Sanjeev V Namjoshi
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Ayse Uneri
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Eva C Bach
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
- Wake Forest Translational Alcohol Research Center (WF-TARC), Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Jeffrey L Weiner
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
- Wake Forest Translational Alcohol Research Center (WF-TARC), Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Kimberly F Raab-Graham
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA.
- Wake Forest Translational Alcohol Research Center (WF-TARC), Wake Forest University Health Sciences, 1 Medical Center Boulevard, Winston-Salem, NC, 27157, USA.
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Bach EC, Morgan JW, Ewin SE, Barth SH, Raab-Graham KF, Weiner JL. Chronic Ethanol Exposures Leads to a Negative Affective State in Female Rats That Is Accompanied by a Paradoxical Decrease in Ventral Hippocampus Excitability. Front Neurosci 2021; 15:669075. [PMID: 33994940 PMCID: PMC8119765 DOI: 10.3389/fnins.2021.669075] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 03/30/2021] [Indexed: 11/13/2022] Open
Abstract
Alcohol use disorder (AUD) differentially impacts men and women and a growing body of evidence points to sex-dependent adaptations in a number of brain regions. In a prior study, we explored the effect of a chronic intermittent ethanol exposure (CIE) model of AUD on neuronal and molecular adaptations in the dorsal and ventral domains of the hippocampus (dHC and vHC, respectively) in male rats. We found the vHC to be particularly sensitive to CIE, showing an increase in neuronal excitability and synaptic proteins associated with augmented excitation. These findings were accompanied by a CIE-dependent increase in anxiety-like behaviors. To explore sex-dependent adaptations in the hippocampus, we conducted a similar study in female rats. CIE-treated female rats showed a relatively modest increase in anxiety-like behaviors along with a robust increase in depressive-like measures. Despite both sexes showing clear evidence of a negative affective state following CIE, the vHC of females showed a decrease, rather than an increase, in neuronal excitability. In line with the reduced sensitivity to neural adaptations in the dHC of male rats, we were unable to identify any functional changes in the dHC of females. The functional changes of the vHC in female rats could not be explained by altered expression levels of a number of proteins typically associated with changes in neuronal excitability. Taken together, these findings point to sex as a major factor in CIE-dependent hippocampal adaptations that should be explored further to better understand possible gender differences in the etiology and treatment of AUD.
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Affiliation(s)
- Eva C Bach
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - James W Morgan
- Department of Anesthesia, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Sarah E Ewin
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Samuel H Barth
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Kimberly F Raab-Graham
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Jeffrey L Weiner
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
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Bach EC, Vaughan JW, Stein BE, Rowland BA. Pulsed Stimuli Elicit More Robust Multisensory Enhancement than Expected. Front Integr Neurosci 2018; 11:40. [PMID: 29354037 PMCID: PMC5758560 DOI: 10.3389/fnint.2017.00040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 12/15/2017] [Indexed: 11/28/2022] Open
Abstract
Neurons in the superior colliculus (SC) integrate cross-modal inputs to generate responses that are more robust than to either input alone, and are frequently greater than their sum (superadditive enhancement). Previously, the principles of a real-time multisensory transform were identified and used to accurately predict a neuron's responses to combinations of brief flashes and noise bursts. However, environmental stimuli frequently have more complex temporal structures that elicit very different response dynamics than previously examined. The present study tested whether such stimuli (i.e., pulsed) would be treated similarly by the multisensory transform. Pulsing visual and auditory stimuli elicited responses composed of higher discharge rates that had multiple peaks temporally aligned to the stimulus pulses. Combinations pulsed cues elicited multiple peaks of superadditive enhancement within the response window. Measured over the entire response, this resulted in larger enhancements than expected given enhancements elicited by non-pulsed (“sustained”) stimuli. However, as with sustained stimuli, the dynamics of multisensory responses to pulsed stimuli were highly related to the temporal dynamics of the unisensory inputs. This suggests that the specific characteristics of the multisensory transform are not determined by the external features of the cross-modal stimulus configuration; rather the temporal structure and alignment of the unisensory inputs is the dominant driving factor in the magnitudes of the multisensory product.
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Affiliation(s)
- Eva C Bach
- Department Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - John W Vaughan
- Department Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Barry E Stein
- Department Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Benjamin A Rowland
- Department Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC, United States
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Bach EC, Smith BN. Presynaptic NMDA receptor-mediated modulation of excitatory neurotransmission in the mouse dorsal motor nucleus of the vagus. J Neurophysiol 2012; 108:1484-91. [PMID: 22696534 DOI: 10.1152/jn.01036.2011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Activity of neurons in the dorsal motor nucleus of the vagus nerve (DMV) is closely regulated by synaptic input, and regulation of that input by glutamate receptors on presynaptic terminals has been proposed. Presynaptic N-methyl-d-aspartic acid (NMDA) receptors have been identified in a number of brain regions and act to modulate neurotransmitter release, but functional presynaptic NMDA receptors have not been adequately studied in the DMV. This study identified the presence and physiological function of presynaptic NMDA receptors on synaptic input to DMV neurons. Whole-cell patch-clamp recordings from DMV neurons in acute slices from mice revealed prevalent miniature excitatory postsynaptic currents, which were significantly increased in frequency, but not amplitude, by application of NMDA. Antagonism of NMDA receptors with dl-2-amino-5-phosphonopentanoic acid (100 μM) resulted in a decrease in miniature excitatory postsynaptic current frequency and an increase in the paired pulse ratio of responses following afferent stimulation. No consistent effects of presynaptic NMDA receptor modulation were observed on GABAergic inputs. These results suggest that presynaptic NMDA receptors are present in the dorsal vagal complex and function to facilitate the release of glutamate, preferentially onto DMV neurons tonically, with little effect on GABA release. This type of presynaptic modulation represents a potentially novel form of glutamate regulation in the DMV, which may function to regulate glutamate-induced activity of central parasympathetic circuits.
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Affiliation(s)
- Eva C Bach
- Department of Physiology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
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Hunt RF, Haselhorst LA, Schoch KM, Bach EC, Rios-Pilier J, Scheff SW, Saatman KE, Smith BN. Posttraumatic mossy fiber sprouting is related to the degree of cortical damage in three mouse strains. Epilepsy Res 2012; 99:167-70. [PMID: 22047981 PMCID: PMC3290720 DOI: 10.1016/j.eplepsyres.2011.10.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 09/16/2011] [Accepted: 10/09/2011] [Indexed: 11/22/2022]
Abstract
Controlled cortical impact injury was used to examine relationships between focal posttraumatic cortical damage and mossy fiber sprouting (MFS) in the dentate gyrus in three mouse strains. Posttraumatic MFS was more robust when cortical injury impinged upon the hippocampus, versus contusions restricted to neocortex, and was qualitatively similar among CD-1, C57BL/6, and FVB/N background strains. Impact parameters influencing injury severity may be critical in reproducing epilepsy-related changes in neurotrauma models.
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Affiliation(s)
- Robert F. Hunt
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
| | - Laura A. Haselhorst
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
| | - Kathleen M. Schoch
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536-0298, USA
| | - Eva C. Bach
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
| | | | - Stephen W. Scheff
- Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536-0298, USA
- Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40536-0298, USA
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536-0298, USA
| | - Kathryn E. Saatman
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536-0298, USA
| | - Bret N. Smith
- Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536-0298, USA
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