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Cheng Q, Lamb P, Stevanovic K, Bernstein BJ, Fry SA, Cushman JD, Yakel JL. Differential signalling induced by α7 nicotinic acetylcholine receptors in hippocampal dentate gyrus in vitro and in vivo. J Physiol 2021; 599:4687-4704. [PMID: 34487349 DOI: 10.1113/jp280505] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 09/03/2021] [Indexed: 11/08/2022] Open
Abstract
The activation of α7 nicotinic acetylcholine receptors (nAChRs) has been shown to improve hippocampus-dependent learning and memory. α7 nAChRs are densely expressed among several different cell types in the hippocampus, with high Ca2+ permeability, although it is unclear if α7 nAChRs mobilize differential signalling mechanisms among distinct neuronal populations. To address this question, we compared α7 nAChR agonist-induced responses (i.e. calcium and cAMP changes) between granule cells and GABAergic neurons in the hippocampal dentate gyrus both in vitro and in vivo. In cultured organotypic hippocampal slices, we observed robust intracellular calcium and cAMP increases in dentate granule cells upon activation of α7 nAChRs. In contrast, GABAergic interneurons displayed little change in either calcium or cAMP concentration after α7 nAChR activation, even though they displayed much larger α7 nAChR current responses than those of dentate granule cells. We found that this was due to smaller α7 nAChR-induced Ca2+ rises in GABAergic interneurons. Thus, the regulation of the Ca2+ transients in different cell types resulted in differential subsequent intracellular signalling cascades and likely the ultimate outcome of α7 nAChR activation. Furthermore, we monitored neuronal activities of dentate granule cells and GABAergic interneurons in vivo via optic fibre photometry. We observed enhancement of neuronal activities after nicotine administration in dentate granule cells, but not in GABAergic neurons, which was absent in α7 nAChR-deficient granule cells. In summary, we reveal a mechanism for α7 nAChR-mediated increase of neuronal activity via cell type-specific intracellular signalling pathways. KEY POINTS: α7 nicotinic acetylcholine receptors (nAChRs) are widely distributed throughout the central nervous system and regulate a variety of brain functions including learning and memory. Understanding the cellular signalling mechanisms of their activations among different neuronal populations is important for delineating their actions in cognitive function, and developing effective treatment strategies for cognitive deficits. We report that α7 nAChR activation leads to Ca2+ and cAMP increases in granule cells (but not in GABAergic interneurons) in hippocampal dentate gyrus in vitro, a key region for pattern separation during learning. We also found that nicotine enhanced granule cell (but not in GABAergic interneurons) activity in an α7 nAChR-dependent manner via in vivo fibre photometry recording. Based on our findings, we propose that differential responses to α7 nAChR activation between granule cells and GABAergic interneurons is responsible for the increase of excitation by α7 nAChR agonists in hippocampal circuits synergistically.
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Affiliation(s)
- Qing Cheng
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA.,Biological/Biomedical Research Institute, North Carolina Central University, Durham, NC, USA
| | - Patricia Lamb
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
| | - Korey Stevanovic
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
| | - Briana J Bernstein
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
| | - Sydney A Fry
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
| | - Jesse D Cushman
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
| | - Jerrel L Yakel
- Neurobiology Laboratory, The National Institute of Environmental Health Sciences/National Institutes of Health, Durham, NC, USA
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Doncheck EM, Hafenbreidel M, Ruder SA, Fitzgerald MK, Torres L, Mueller D. bFGF expression is differentially regulated by cocaine seeking versus extinction in learning-related brain regions. Learn Mem 2018; 25:361-368. [PMID: 30012881 PMCID: PMC6049391 DOI: 10.1101/lm.047530.118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 06/11/2018] [Indexed: 11/24/2022]
Abstract
In cocaine use disorder, relapse can be elicited by drug-associated cues despite long periods of abstinence. The persistence of drug-associated cues in eliciting drug seeking suggests enduring changes in structural and functional plasticity, which may be mediated by basic fibroblast growth factor (bFGF, FGF2). Stimulant drug use increases bFGF expression in reward- and learning-related brain regions, such as the infralimbic medial-prefrontal cortex (IL-mPFC), and we previously found that this increase was reversed by extinction. However, whether bFGF expression is similarly modified in other brain regions is unknown. Therefore, we used the conditioned place preference (CPP) paradigm to assess bFGF expression following cocaine-associated CPP or extinction of that CPP within the mPFC, nucleus accumbens (NAc), hippocampus (Hipp), and basolateral amygdala (BLA). bFGF expression was increased in IL-mPFC and NAc-Core and -Shell following a cocaine-associated CPP, an effect reversed by extinction. Conversely, bFGF expression was increased in BLA following extinction, but no significant changes were observed in PL-mPFC or either dorsal or ventral Hipp. These results demonstrate differential regulation of bFGF following cocaine-associated CPP or extinction of that CPP in discrete brain regions. Changes in bFGF expression may regulate long-lasting drug-induced plasticity that underlies persistent drug-associated memories, and therefore present potential prophylactic targets.
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Affiliation(s)
- Elizabeth M Doncheck
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413, USA
| | - Madalyn Hafenbreidel
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413, USA
| | - Sarah A Ruder
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413, USA
| | - Michael K Fitzgerald
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413, USA
| | - Lilith Torres
- Department of Basic Sciences, Ponce Health Sciences University-School of Medicine/Ponce Research Institute, Ponce, Puerto Rico, 00732, USA
| | - Devin Mueller
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413, USA
- Department of Basic Sciences, Ponce Health Sciences University-School of Medicine/Ponce Research Institute, Ponce, Puerto Rico, 00732, USA
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Blocking Infralimbic Basic Fibroblast Growth Factor (bFGF or FGF2) Facilitates Extinction of Drug Seeking After Cocaine Self-Administration. Neuropsychopharmacology 2015; 40:2907-15. [PMID: 25994078 PMCID: PMC4864626 DOI: 10.1038/npp.2015.144] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 05/06/2015] [Accepted: 05/15/2015] [Indexed: 01/09/2023]
Abstract
Drug exposure results in structural and functional changes in brain regions that regulate reward and these changes may underlie the persistence of compulsive drug seeking and relapse. Neurotrophic factors, such as basic fibroblast growth factor (bFGF or FGF2), are necessary for neuronal survival, growth, and differentiation, and may contribute to these drug-induced changes. Following cocaine exposure, bFGF is increased in addiction-related brain regions, including the infralimbic medial prefrontal cortex (IL-mPFC). The IL-mPFC is necessary for extinction, but whether drug-induced overexpression of bFGF in this region affects extinction of drug seeking is unknown. Thus, we determined whether blocking bFGF in IL-mPFC would facilitate extinction following cocaine self-administration. Rats were trained to lever press for intravenous infusions of cocaine before extinction. Blocking bFGF in IL-mPFC before four extinction sessions resulted in facilitated extinction. In contrast, blocking bFGF alone was not sufficient to facilitate extinction, as blocking bFGF and returning rats to their home cage had no effect on subsequent extinction. Furthermore, bFGF protein expression increased in IL-mPFC following cocaine self-administration, an effect reversed by extinction. These results suggest that cocaine-induced overexpression of bFGF inhibits extinction, as blocking bFGF during extinction permits rapid extinction. Therefore, targeted reductions in bFGF during therapeutic interventions could enhance treatment outcomes for addiction.
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Kolb B, Gibb R. Plasticity in the prefrontal cortex of adult rats. Front Cell Neurosci 2015; 9:15. [PMID: 25691857 PMCID: PMC4315042 DOI: 10.3389/fncel.2015.00015] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 01/10/2015] [Indexed: 12/15/2022] Open
Abstract
We review the plastic changes of the prefrontal cortex of the rat in response to a wide range of experiences including sensory and motor experience, gonadal hormones, psychoactive drugs, learning tasks, stress, social experience, metaplastic experiences, and brain injury. Our focus is on synaptic changes (dendritic morphology and spine density) in pyramidal neurons and the relationship to behavioral changes. The most general conclusion we can reach is that the prefrontal cortex is extremely plastic and that the medial and orbital prefrontal regions frequently respond very differently to the same experience in the same brain and the rules that govern prefrontal plasticity appear to differ for those of other cortical regions.
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Affiliation(s)
- Bryan Kolb
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge Lethbridge, AB, Canada
| | - Robbin Gibb
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge Lethbridge, AB, Canada
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Yarishkin O, Lee DY, Kim E, Cho CH, Choi JH, Lee CJ, Hwang EM, Park JY. TWIK-1 contributes to the intrinsic excitability of dentate granule cells in mouse hippocampus. Mol Brain 2014; 7:80. [PMID: 25406588 PMCID: PMC4240835 DOI: 10.1186/s13041-014-0080-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 10/24/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Two-pore domain K(+) (K2P) channels have been shown to modulate neuronal excitability. However, physiological function of TWIK-1, the first identified member of the mammalian K2P channel family, in neuronal cells is largely unknown. RESULTS We found that TWIK-1 proteins were expressed and localized mainly in the soma and proximal dendrites of dentate gyrus granule cells (DGGCs) rather than in distal dendrites or mossy fibers. Gene silencing demonstrates that the outwardly rectifying K(+) current density was reduced in TWIK-1-deficient granule cells. TWIK-1 deficiency caused a depolarizing shift in the resting membrane potential (RMP) of DGGCs and enhanced their firing rate in response to depolarizing current injections. Through perforant path stimulation, TWIK-1-deficient granule cells showed altered signal input-output properties with larger EPSP amplitude values and increased spiking compared to control DGGCs. In addition, supra-maximal perforant path stimulation evoked a graded burst discharge in 44% of TWIK-1-deficient cells, which implies impairment of EPSP-spike coupling. CONCLUSIONS These results showed that TWIK-1 is functionally expressed in DGGCs and contributes to the intrinsic excitability of these cells. The TWIK-1 channel is involved in establishing the RMP of DGGCs; it attenuates sub-threshold depolarization of the cells during neuronal activity, and contributes to EPSP-spike coupling in perforant path-to-granule cell synaptic transmission.
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Affiliation(s)
- Oleg Yarishkin
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea.
| | - Da Yong Lee
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea. .,Korea Research Institute of Bioscience and Biotechnology (KRIBB), Stem Cell Research Center, Daejeon, 305-806, Republic of Korea.
| | - Eunju Kim
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea.
| | - Chang-Hoon Cho
- School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul, 136-703, Republic of Korea.
| | - Jae Hyouk Choi
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea. .,Neuroscience Program, University of Science and Technology (UST), Daejeon, 305-350, Republic of Korea.
| | - C Justin Lee
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea. .,Neuroscience Program, University of Science and Technology (UST), Daejeon, 305-350, Republic of Korea.
| | - Eun Mi Hwang
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea. .,Neuroscience Program, University of Science and Technology (UST), Daejeon, 305-350, Republic of Korea.
| | - Jae-Yong Park
- Korea Institute of Science and Technology (KIST), Center for Functional Connectomics, Seoul, 136-791, Republic of Korea. .,School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul, 136-703, Republic of Korea.
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