51
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Ma F, Dong Z, Berberoglu MA. Expression of RNA-binding protein Rbfox1l demarcates a restricted population of dorsal telencephalic neurons within the adult zebrafish brain. Gene Expr Patterns 2019; 31:32-41. [PMID: 30634066 DOI: 10.1016/j.gep.2019.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/22/2018] [Accepted: 01/04/2019] [Indexed: 01/16/2023]
Abstract
Rbfox RNA-binding proteins are expressed in the adult mammalian brain and are required for proper brain development and function. Studies in mice and humans have implicated Rbfox1/RBFOX1 in autism, neuronal excitation and epilepsy, and Rbfox2/RBFOX2 in cerebellar development. The zebrafish has emerged as a prominent model system for brain study, possessing neuroanatomical conservation with mammals and an extensive capacity for adult neurogenesis and plasticity. In this study, we characterize Rbfox1l and Rbfox2 expression in the adult zebrafish brain. While Rbfox2 is expressed broadly, Rbfox1l is expressed in restricted populations of neurons in the dorsal telencephalon and cerebellum. In the dorsal telencephalon, Rbfox1l is expressed in a specific population of neurons spanning Dm and Dc regions. In the cerebellum, Rbfox1l and Rbfox2 are expressed in the Purkinje cell layer, reminiscent of Rbfox1 and Rbfox2 expression in the mammalian cerebellum. Our findings motivate future studies of Rbfox function in the zebrafish brain.
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Affiliation(s)
- Fengjun Ma
- Bio-Medical Center, College of Life Science & Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Zhiqiang Dong
- Bio-Medical Center, College of Life Science & Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Michael A Berberoglu
- Bio-Medical Center, College of Life Science & Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Department of Molecular Genetics, The Ohio State University, Columbus, OH, 43210, USA; Department of Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA; Center for Muscle Health and Neuromuscular Disorders, The Ohio State University, Nationwide Children's Hospital, Columbus, OH, 43210, USA.
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52
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Social isolation impairs active avoidance performance and decreases neurogenesis in the dorsomedial telencephalon of rainbow trout. Physiol Behav 2019; 198:1-10. [DOI: 10.1016/j.physbeh.2018.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 10/04/2018] [Accepted: 10/04/2018] [Indexed: 11/22/2022]
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53
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Riaño-Quintero C, Gómez-Ramírez E, Hurtado-Giraldo H. Glyphosate commercial formulation effects on preoptic area and hypothalamus of Cardinal Neon Paracheirodon axelrodi (Characiformes: Characidae). NEOTROPICAL ICHTHYOLOGY 2019. [DOI: 10.1590/1982-0224-20190025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT In Colombia the use of glyphosate commercial formulations (Roundup™) for spraying have left deleterious effects on animals and humans. Much of this spraying takes place at the Orinoco basin, habitat of one of the most exported ornamental fish in Colombia, Cardinal neon. To evaluate the effect of Roundup Activo™ four experimental treatments were carried out with 0 mg/L (T1), 0.1 mg/L (T2), 1 mg/L (T3) and 5 mg/L (T4) during 30 days of exposure. The fishes were processed for high-resolution optical microscopy. The main finding of Roundup Activo™ exposure was an increase in mast cells number in brain blood vessels and some neuronal nuclei of the preoptic and posterior diencephalic areas, including hypothalamus. A correlation between concentrations and mast cells number was observed, with the largest mast cells number in T4 treatment. Mast cells presence is a stress benchmark, suggesting the beginning of allergic, inflammatory and apoptotic events. Presence of mast cells in these brain areas may lead to alterations on reproduction, visual and olfactory information integration among other processes. These alterations may result in diminished survival, affecting the conservation of this species in its natural habitat.
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54
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Kawaguchi M, Hagio H, Yamamoto N, Matsumoto K, Nakayama K, Akazome Y, Izumi H, Tsuneoka Y, Suto F, Murakami Y, Ichijo H. Atlas of the telencephalon based on cytoarchitecture, neurochemical markers, and gene expressions in Rhinogobius flumineus [Mizuno, 1960]. J Comp Neurol 2018; 527:874-900. [PMID: 30516281 DOI: 10.1002/cne.24547] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 09/18/2018] [Accepted: 09/23/2018] [Indexed: 11/10/2022]
Abstract
Gobiida is a basal subseries of percomorphs in teleost fishes, holding a useful position for comparisons with other orders of Percomorpha as well as other cohort of teleosts. Here, we describe a telencephalic atlas of a Gobiida species Rhinogobius flumineus (Mizuno, Memoirs of the College of Science, University of Kyoto, Series B: Biology, 1960; 27, 3), based on cytoarchitectural observations, combined with analyses of the distribution patterns of neurochemical markers and transcription factors. The telencephalon of R. flumineus shows a number of features distinct from those of other teleosts. Among others, the followings were of special note. (a) The lateral part of dorsal telencephalon (Dl), which is known as a visual center in other teleosts, is composed of as many as seven regions, some of which are conspicuous, circumscribed by cell plates. These subdivisions of the Dl can be differentiated clearly by differential soma size and color with Nissl-staining, and distribution patterns of neural markers. (b) Cell populations continuous with the ventral region of dorsal part of ventral telencephalon (vVd) exhibit extensive dimension. Especially, portion 1 of the central part of ventral telencephalon appears to represent a cell population laterally translocated from the vVd, forming a large cluster of small cells that penetrate deep into the central part of dorsal telencephalon. (c) The magnocellular subdivision of dorsal part of dorsal telencephalon (Ddmg) contains not only large cells but also vglut2a-positive clusters of small cells that cover a wide range of the caudal Ddmg. Such clusters of small cells have not been observed in the Ddmg of other teleosts.
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Affiliation(s)
- Masahumi Kawaguchi
- Department of Anatomy and Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan.,Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan
| | - Hanako Hagio
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Naoyuki Yamamoto
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | | | - Kei Nakayama
- Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan
| | - Yasuhisa Akazome
- Department of Anatomy, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Hironori Izumi
- Division of Molecular Genetics Research, Life Science Research Center, University of Toyama, Toyama, Japan
| | - Yousuke Tsuneoka
- Department of Anatomy, School of Medicine, Toho University, Tokyo, Japan
| | - Fumikazu Suto
- National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Japan
| | - Yasunori Murakami
- Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan
| | - Hiroyuki Ichijo
- Department of Anatomy and Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
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55
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do Carmo Silva RX, Lima-Maximino MG, Maximino C. The aversive brain system of teleosts: Implications for neuroscience and biological psychiatry. Neurosci Biobehav Rev 2018; 95:123-135. [DOI: 10.1016/j.neubiorev.2018.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 12/24/2022]
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56
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Li CY, Hofmann HA, Harris ML, Earley RL. Real or fake? Natural and artificial social stimuli elicit divergent behavioural and neural responses in mangrove rivulus, Kryptolebias marmoratus. Proc Biol Sci 2018; 285:rspb.2018.1610. [PMID: 30429304 DOI: 10.1098/rspb.2018.1610] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/26/2018] [Indexed: 11/12/2022] Open
Abstract
Understanding how the brain processes social information and generates adaptive behavioural responses is a major goal in neuroscience. We examined behaviour and neural activity patterns in socially relevant brain nuclei of hermaphroditic mangrove rivulus fish (Kryptolebias marmoratus) provided with different types of social stimuli: stationary model opponent, regular mirror, non-reversing mirror and live opponent. We found that: (i) individuals faced with a regular mirror were less willing to interact with, delivered fewer attacks towards and switched their orientation relative to the opponent more frequently than fish exposed to a non-reversing mirror image or live opponent; (ii) fighting with a regular mirror image caused higher expression of immediate-early genes (IEGs: egr-1 and c-Fos) in the teleost homologues of the basolateral amygdala and hippocampus, but lower IEG expression in the preoptic area, than fighting with a non-reversing mirror image or live opponent; (iii) stationary models elicited the least behavioural and IEG responses among the four stimuli; and (iv) the non-reversing mirror image and live opponent drove similar behavioural and neurobiological responses. These results suggest that the various stimuli provide different types of information related to conspecific recognition in the context of aggressive contests, which ultimately drive different neurobiological responses.
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Affiliation(s)
- Cheng-Yu Li
- Department of Biological Sciences, University of Alabama, Tuscaloosa, AL 35487, USA
| | - Hans A Hofmann
- Department of Integrative Biology, Institute for Cellular and Molecular Biology, Institute for Neuroscience, The University of Texas, Austin, TX 78712, USA
| | - Melissa L Harris
- Department of Biological Sciences, University of Alabama, Birmingham, AL 35294, USA
| | - Ryan L Earley
- Department of Biological Sciences, University of Alabama, Tuscaloosa, AL 35487, USA
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57
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Kasper C, Hebert FO, Aubin-Horth N, Taborsky B. Divergent brain gene expression profiles between alternative behavioural helper types in a cooperative breeder. Mol Ecol 2018; 27:4136-4151. [DOI: 10.1111/mec.14837] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 07/21/2018] [Accepted: 08/07/2018] [Indexed: 01/17/2023]
Affiliation(s)
- Claudia Kasper
- Behavioural Ecology; University of Bern; Hinterkappelen Switzerland
| | - Francois Olivier Hebert
- Département de Biologie et Institut de Biologie Intégrative et des Systèmes; Université Laval; Québec Québec Canada
| | - Nadia Aubin-Horth
- Département de Biologie et Institut de Biologie Intégrative et des Systèmes; Université Laval; Québec Québec Canada
| | - Barbara Taborsky
- Behavioural Ecology; University of Bern; Hinterkappelen Switzerland
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58
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Mes D, von Krogh K, Gorissen M, Mayer I, Vindas MA. Neurobiology of Wild and Hatchery-Reared Atlantic Salmon: How Nurture Drives Neuroplasticity. Front Behav Neurosci 2018; 12:210. [PMID: 30254575 PMCID: PMC6141658 DOI: 10.3389/fnbeh.2018.00210] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 08/21/2018] [Indexed: 12/03/2022] Open
Abstract
Life experiences in the rearing environment shape the neural and behavioral plasticity of animals. In fish stocking practices, the hatchery environment is relatively stimulus-deprived and does not optimally prepare fish for release into the wild. While the behavioral differences between wild and hatchery-reared fish have been examined to some extent, few studies have compared neurobiological characteristics between wild and hatchery-reared individuals. Here, we compare the expression of immediate early gene cfos and neuroplasticity marker brain-derived neurotrophic factor (bdnf) in telencephalic subregions associated with processing of stimuli in wild and hatchery-reared Atlantic salmon at basal and 30 min post (acute) stress conditions. Using in situ hybridization, we found that the expression level of these markers is highly specific per neuronal region and affected by both the origin of the fish, and exposure to acute stress. Expression of cfos was increased by stress in all brain regions and cfos was more highly expressed in the Dlv (functional equivalent to the mammalian hippocampus) of hatchery-reared compared to wild fish. Expression of bdnf was higher overall in hatchery fish, while acute stress upregulated bdnf in the Dm (functional equivalent to the mammalian amygdala) of wild, but not hatchery individuals. Our findings demonstrate that the hatchery environment affects neuroplasticity and neural activation in brain regions that are important for learning processes and stress reactivity, providing a neuronal foundation for the behavioral differences observed between wild and hatchery-reared fish.
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Affiliation(s)
- Daan Mes
- Department of Production Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Kristine von Krogh
- Department of Basic Sciences and Aquatic Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Marnix Gorissen
- Department of Animal Ecology and Physiology, Institute of Water and Wetland Research, Radboud University, Nijmegen, Netherlands
| | - Ian Mayer
- Department of Production Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Marco A Vindas
- Uni Environment, Uni Research AS, Bergen, Norway.,Department of Neurobiology and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Oslo, Norway
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59
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Chin JSR, Gassant CE, Amaral PM, Lloyd E, Stahl BA, Jaggard JB, Keene AC, Duboue ER. Convergence on reduced stress behavior in the Mexican blind cavefish. Dev Biol 2018; 441:319-327. [PMID: 29803645 DOI: 10.1016/j.ydbio.2018.05.009] [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: 02/14/2018] [Revised: 04/19/2018] [Accepted: 05/11/2018] [Indexed: 01/09/2023]
Abstract
Responding appropriately to stress is essential for survival, yet in pathological states, these responses can develop into debilitating conditions such as post-traumatic stress disorder and generalized anxiety. While genetic models have provided insight into the neurochemical and neuroanatomical pathways that underlie stress, little is known about how evolutionary processes and naturally occurring variation contribute to the diverse responses to stressful stimuli observed in the animal kingdom. The Mexican cavefish is a powerful system to address how altered genetic and neuronal systems can give rise to altered behaviors. When introduced into a novel tank, surface fish and cavefish display a stereotypic stress response, characterized by reduced exploratory behavior and increased immobility, akin to "freezing". The stress response in cave and surface forms is reduced by pharmacological treatment with the anxiolytic drug, buspirone, fortifying the notion that behavior in the assay represents a conserved stress state. We find that cave populations display reduced behavioral measures of stress compared to surface conspecifics, including increased time in the top half of the tank and fewer periods of immobility. Further, reduced stress responses are observed in multiple independently derived cavefish populations, suggesting convergence on loss of behavioral stress responses in the novel tank assay. These findings provide evidence of a naturally occurring species with two drastically different forms in which a shift in predator-rich ecology to one with few predators corresponds to a reduction in stress behavior.
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Affiliation(s)
- Jacqueline S R Chin
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Claude E Gassant
- Wilkes Honors College, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Paloma M Amaral
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Evan Lloyd
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA; Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Bethany A Stahl
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA; Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458, USA
| | - James B Jaggard
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA; Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Alex C Keene
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA; Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458, USA.
| | - Erik R Duboue
- Jupiter Life Science Initiative, Florida Atlantic University, Jupiter, FL 33458, USA; Wilkes Honors College, Florida Atlantic University, Jupiter, FL 33458, USA.
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60
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Forlano PM, Licorish RR, Ghahramani ZN, Timothy M, Ferrari M, Palmer WC, Sisneros JA. Attention and Motivated Response to Simulated Male Advertisement Call Activates Forebrain Dopaminergic and Social Decision-Making Network Nuclei in Female Midshipman Fish. Integr Comp Biol 2018; 57:820-834. [PMID: 28992072 DOI: 10.1093/icb/icx053] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Little is known regarding the coordination of audition with decision-making and subsequent motor responses that initiate social behavior including mate localization during courtship. Using the midshipman fish model, we tested the hypothesis that the time spent by females attending and responding to the advertisement call is correlated with the activation of a specific subset of catecholaminergic (CA) and social decision-making network (SDM) nuclei underlying auditory- driven sexual motivation. In addition, we quantified the relationship of neural activation between CA and SDM nuclei in all responders with the goal of providing a map of functional connectivity of the circuitry underlying a motivated state responsive to acoustic cues during mate localization. In order to make a baseline qualitative comparison of this functional brain map to unmotivated females, we made a similar correlative comparison of brain activation in females who were unresponsive to the advertisement call playback. Our results support an important role for dopaminergic neurons in the periventricular posterior tuberculum and ventral thalamus, putative A11 and A13 tetrapod homologues, respectively, as well as the posterior parvocellular preoptic area and dorsomedial telencephalon, (laterobasal amygdala homologue) in auditory attention and appetitive sexual behavior in fishes. These findings may also offer insights into the function of these highly conserved nuclei in the context of auditory-driven reproductive social behavior across vertebrates.
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Affiliation(s)
- Paul M Forlano
- Department of Biology, Brooklyn College, The City University of New York, Brooklyn, NY, USA.,Biology Subprogram in Ecology, Evolutionary Biology, and Behavior, The Graduate Center, City University of New York, New York, NY, USA.,Biology Subprogram in Neuroscience, The Graduate Center, City University of New York, New York, NY, USA.,Psychology Subprogram in Behavioral and Cognitive Neuroscience, The Graduate Center, City University of New York, New York, NY, USA.,Aquatic Research and Environmental Assessment Center, Brooklyn College, Brooklyn, NY, USA
| | - Roshney R Licorish
- Department of Biology, Brooklyn College, The City University of New York, Brooklyn, NY, USA
| | - Zachary N Ghahramani
- Department of Biology, Brooklyn College, The City University of New York, Brooklyn, NY, USA.,Biology Subprogram in Ecology, Evolutionary Biology, and Behavior, The Graduate Center, City University of New York, New York, NY, USA
| | - Miky Timothy
- Department of Biology, Brooklyn College, The City University of New York, Brooklyn, NY, USA
| | | | - William C Palmer
- Department of Psychology, University of Washington, Seattle, WA, USA
| | - Joseph A Sisneros
- Department of Psychology, University of Washington, Seattle, WA, USA.,Virginia Bloedel Hearing Research Center, Seattle, WA, USA
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61
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Soengas JL, Cerdá-Reverter JM, Delgado MJ. Central regulation of food intake in fish: an evolutionary perspective. J Mol Endocrinol 2018; 60:R171-R199. [PMID: 29467140 DOI: 10.1530/jme-17-0320] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 02/21/2018] [Indexed: 12/11/2022]
Abstract
Evidence indicates that central regulation of food intake is well conserved along the vertebrate lineage, at least between teleost fish and mammals. However, several differences arise in the comparison between both groups. In this review, we describe similarities and differences between teleost fish and mammals on an evolutionary perspective. We focussed on the existing knowledge of specific fish features conditioning food intake, anatomical homologies and analogies between both groups as well as the main signalling pathways of neuroendocrine and metabolic nature involved in the homeostatic and hedonic central regulation of food intake.
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Affiliation(s)
- José Luis Soengas
- Departamento de Bioloxía Funcional e Ciencias da SaúdeLaboratorio de Fisioloxía Animal, Facultade de Bioloxía and Centro de Investigación Mariña, Universidade de Vigo, Vigo, Spain
| | - José Miguel Cerdá-Reverter
- Departamento de Fisiología de Peces y BiotecnologíaInstituto de Acuicultura Torre de la Sal, Consejo Superior de Investigaciones Científicas (CSIC), Castellón, Spain
| | - María Jesús Delgado
- Departamento de Fisiología (Fisiología Animal II)Facultad de Biología, Universidad Complutense de Madrid, Madrid, Spain
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62
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Lal P, Tanabe H, Suster ML, Ailani D, Kotani Y, Muto A, Itoh M, Iwasaki M, Wada H, Yaksi E, Kawakami K. Identification of a neuronal population in the telencephalon essential for fear conditioning in zebrafish. BMC Biol 2018; 16:45. [PMID: 29690872 PMCID: PMC5978991 DOI: 10.1186/s12915-018-0502-y] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 03/07/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Fear conditioning is a form of learning essential for animal survival and used as a behavioral paradigm to study the mechanisms of learning and memory. In mammals, the amygdala plays a crucial role in fear conditioning. In teleost, the medial zone of the dorsal telencephalon (Dm) has been postulated to be a homolog of the mammalian amygdala by anatomical and ablation studies, showing a role in conditioned avoidance response. However, the neuronal populations required for a conditioned avoidance response via the Dm have not been functionally or genetically defined. RESULTS We aimed to identify the neuronal population essential for fear conditioning through a genetic approach in zebrafish. First, we performed large-scale gene trap and enhancer trap screens, and created transgenic fish lines that expressed Gal4FF, an engineered version of the Gal4 transcription activator, in specific regions in the brain. We then crossed these Gal4FF-expressing fish with the effector line carrying the botulinum neurotoxin gene downstream of the Gal4 binding sequence UAS, and analyzed the double transgenic fish for active avoidance fear conditioning. We identified 16 transgenic lines with Gal4FF expression in various brain areas showing reduced performance in avoidance responses. Two of them had Gal4 expression in populations of neurons located in subregions of the Dm, which we named 120A-Dm neurons. Inhibition of the 120A-Dm neurons also caused reduced performance in Pavlovian fear conditioning. The 120A-Dm neurons were mostly glutamatergic and had projections to other brain regions, including the hypothalamus and ventral telencephalon. CONCLUSIONS Herein, we identified a subpopulation of neurons in the zebrafish Dm essential for fear conditioning. We propose that these are functional equivalents of neurons in the mammalian pallial amygdala, mediating the conditioned stimulus-unconditioned stimulus association. Thus, the study establishes a basis for understanding the evolutionary conservation and diversification of functional neural circuits mediating fear conditioning in vertebrates.
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Affiliation(s)
- Pradeep Lal
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan.,Department of Genetics, SOKENDAI (The Graduate University for Advanced Studies), Mishima, Shizuoka, 411-8540, Japan.,Kavli Institute for Systems Neuroscience and Centre for the Biology of Memory, Norwegian Brain Centre, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Hideyuki Tanabe
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan
| | - Maximiliano L Suster
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan.,Present address: Visual Interaction GmbH, Warthestrasse 21, 14513, Teltow, Germany
| | - Deepak Ailani
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan
| | - Yuri Kotani
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan
| | - Akira Muto
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan
| | - Mari Itoh
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan
| | - Miki Iwasaki
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan.,Present address: College of Liberal Arts and Sciences, Kitasato University, Sagamihara, Kanagawa, 252-0373, Japan
| | - Hironori Wada
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan.,Present address: College of Liberal Arts and Sciences, Kitasato University, Sagamihara, Kanagawa, 252-0373, Japan
| | - Emre Yaksi
- Kavli Institute for Systems Neuroscience and Centre for the Biology of Memory, Norwegian Brain Centre, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Koichi Kawakami
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, 411-8540, Japan. .,Department of Genetics, SOKENDAI (The Graduate University for Advanced Studies), Mishima, Shizuoka, 411-8540, Japan.
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63
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Maximino C, Meinerz DL, Fontana BD, Mezzomo NJ, Stefanello FV, de S. Prestes A, Batista CB, Rubin MA, Barbosa NV, Rocha JBT, Lima MG, Rosemberg DB. Extending the analysis of zebrafish behavioral endophenotypes for modeling psychiatric disorders: Fear conditioning to conspecific alarm response. Behav Processes 2018; 149:35-42. [DOI: 10.1016/j.beproc.2018.01.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 01/29/2018] [Accepted: 01/30/2018] [Indexed: 12/13/2022]
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64
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Furlan G, Cuccioli V, Vuillemin N, Dirian L, Muntasell AJ, Coolen M, Dray N, Bedu S, Houart C, Beaurepaire E, Foucher I, Bally-Cuif L. Life-Long Neurogenic Activity of Individual Neural Stem Cells and Continuous Growth Establish an Outside-In Architecture in the Teleost Pallium. Curr Biol 2017; 27:3288-3301.e3. [PMID: 29107546 PMCID: PMC5678050 DOI: 10.1016/j.cub.2017.09.052] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/14/2017] [Accepted: 09/25/2017] [Indexed: 01/08/2023]
Abstract
Spatiotemporal variations of neurogenesis are thought to account for the evolution of brain shape. In the dorsal telencephalon (pallium) of vertebrates, it remains unresolved which ancestral neurogenesis mode prefigures the highly divergent cytoarchitectures that are seen in extant species. To gain insight into this question, we developed genetic tools to generate here the first 4-dimensional (3D + birthdating time) map of pallium construction in the adult teleost zebrafish. Using a Tet-On-based genetic birthdating strategy, we identify a “sequential stacking” construction mode where neurons derived from the zebrafish pallial germinal zone arrange in outside-in, age-related layers from a central core generated during embryogenesis. We obtained no evidence for overt radial or tangential neuronal migrations. Cre-lox-mediated tracing, which included following Brainbow clones, further demonstrates that this process is sustained by the persistent neurogenic activity of individual pallial neural stem cells (NSCs) from embryo to adult. Together, these data demonstrate that the spatiotemporal control of NSC activity is an important driver of the macroarchitecture of the zebrafish adult pallium. This simple mode of pallium construction shares distinct traits with pallial genesis in mammals and non-mammalian amniotes such as birds or reptiles, suggesting that it may exemplify the basal layout from which vertebrate pallial architectures were elaborated. Neurons of the teleost pallium are arranged in concentric age-dependent layers Neurons of the central pallial domain, Dc, are born during embryogenesis Most pallial neurons are generated from ventricular her4-positive radial glia The majority of individual pallial radial glia are neurogenic throughout life
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Affiliation(s)
- Giacomo Furlan
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France
| | - Valentina Cuccioli
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France
| | - Nelly Vuillemin
- Laboratory for Optics and Biosciences, École Polytechnique, CNRS UMR 7645 and INSERM U1182, 91128 Palaiseau, France
| | - Lara Dirian
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France
| | - Anna Janue Muntasell
- Centre for Developmental Neurobiology and MRC Centre for Neurodevelopmental Disorders, IoPPN, King's College London, London SE1 1UL, UK
| | - Marion Coolen
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France
| | - Nicolas Dray
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France
| | - Sébastien Bedu
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France
| | - Corinne Houart
- Centre for Developmental Neurobiology and MRC Centre for Neurodevelopmental Disorders, IoPPN, King's College London, London SE1 1UL, UK
| | - Emmanuel Beaurepaire
- Laboratory for Optics and Biosciences, École Polytechnique, CNRS UMR 7645 and INSERM U1182, 91128 Palaiseau, France
| | - Isabelle Foucher
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France.
| | - Laure Bally-Cuif
- Team Zebrafish Neurogenetics, Paris-Saclay Institute for Neuroscience (Neuro-PSI), UMR 9197, CNRS-Université Paris-Sud, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France; Unit Zebrafish Neurogenetics, Developmental and Stem Cell Biology Department, Institut Pasteur, 25 Rue du Dr Roux, 75015 Paris, France; CNRS UMR 3738, 25 Rue du Dr. Roux, 75015 Paris, France.
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Wolkers CPB, Menescal-de-Oliveira L, Hoffmann A. Cannabinoid system of dorsomedial telencephalon modulates behavioral responses to noxious stimulation in the fish Leporinus macrocephalus. Physiol Behav 2017; 179:504-509. [DOI: 10.1016/j.physbeh.2017.07.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 07/10/2017] [Accepted: 07/24/2017] [Indexed: 01/31/2023]
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Unilateral stimulation of the lateral division of the dorsal telencephalon induces synaptic plasticity in the bilateral medial division of zebrafish. Sci Rep 2017; 7:9096. [PMID: 28831099 PMCID: PMC5567264 DOI: 10.1038/s41598-017-08093-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/07/2017] [Indexed: 11/17/2022] Open
Abstract
This study was aimed to evaluate the synaptic plasticity in projections from the dorsal lateral region (Dl) to the bilateral dorsal medial region (Dm) of the zebrafish telencephalon. The results showed that unilateral electrical stimulation of the Dl evokes a negative field potential (FP) in both the contralateral and ipsilateral side of the Dm. We tested synaptic plasticity, including high-frequency stimulation-induced LTP (HFS-LTP) and low-frequency stimulation-induced LTD (LFS-LTD). We demonstrated that HFS-induced bilateral LTP is NMDAR-dependent by the application of an NMDAR antagonist, DL-AP5 (30 μM, suprafused for 10 min), which blocked the HFS-induced LTP in both the contralateral and ipsilateral Dm. In addition, LTP was restored after DL-AP5 was washed out by continuous aCSF suprafusion. These results suggested that the potentiation is NMDAR-dependent. Either LFS (1 Hz for 20 min) or applying the mGluR agonist, DHPG (40 μM, suprafused for 10 min) successfully induced bilateral LTD for at least 1 h. Furthermore, both the contralateral fEPSP and LTP vanished after ablation of the anterior commissure. In conclusion, the results of the present study suggested that the projection between the Dl and contralateral Dm in the telencephalon of zebrafish is via the anterior commissure and possesses synaptic plasticity.
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Kishani Farahani H, Ashouri A, Goldansaz SH, Shapiro MS, Pierre JS, van Baaren J. Decrease of memory retention in a parasitic wasp: an effect of host manipulation by Wolbachia? INSECT SCIENCE 2017; 24:569-583. [PMID: 27090067 DOI: 10.1111/1744-7917.12348] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 02/24/2016] [Accepted: 03/13/2016] [Indexed: 06/05/2023]
Abstract
Several factors, such as cold exposure, aging, the number of experiences and viral infection, have been shown to affect learning ability in different organisms. Wolbachia has been found worldwide as an arthropod parasite/mutualist symbiont in a wide range of species, including insects. Differing effects have been identified on physiology and behavior by Wolbachia. However, the effect of Wolbachia infection on the learning ability of their host had never previously been studied. The current study carried out to compare learning ability and memory duration in 2 strains of the parasitoid Trichogramma brassicae: 1 uninfected and 1 infected by Wolbachia. Both strains were able to associate the novel odors with the reward of an oviposition into a host egg. However, the percentage of females that responded to the experimental design and displayed an ability to learn in these conditions was higher in the uninfected strain. Memory duration was longer in uninfected wasps (23.8 and 21.4 h after conditioning with peppermint and lemon, respectively) than in infected wasps (18.9 and 16.2 h after conditioning with peppermint and lemon, respectively). Memory retention increased in response to the number of conditioning sessions in both strains, but memory retention was always shorter in the infected wasps than in the uninfected ones. Wolbachia infection may select for reduced memory retention because shorter memory induces infected wasps to disperse in new environments and avoid competition with uninfected wasps by forgetting cues related to previously visited environments, thus increasing transmission of Wolbachia in new environments.
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Affiliation(s)
- Hossein Kishani Farahani
- Faculty of Agriculture and Natural Resources, Department of Plant Protection, University of Tehran, Karaj, Iran
| | - Ahmad Ashouri
- Faculty of Agriculture and Natural Resources, Department of Plant Protection, University of Tehran, Karaj, Iran
| | - Seyed Hossein Goldansaz
- Faculty of Agriculture and Natural Resources, Department of Plant Protection, University of Tehran, Karaj, Iran
| | - Martin S Shapiro
- Department of Psychology, California State University, Fresno, USA
| | - Jean-Sebastien Pierre
- UMR-CNRS 6553 EcoBio, University of Rennes 1, Avenue du Général Leclerc, Campus de Beaulieu, 35042, Rennes Cedex, France
| | - Joan van Baaren
- UMR-CNRS 6553 EcoBio, University of Rennes 1, Avenue du Général Leclerc, Campus de Beaulieu, 35042, Rennes Cedex, France
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Abstract
The literature has long emphasized the neocortex's role in volitional processes. In this work, we examined endogenous orienting in an evolutionarily older species, the archer fish, which lacks neocortex-like cells. We used Posner's classic endogenous cuing task, in which a centrally presented, spatially informative cue is followed by a target. The fish responded to the target by shooting a stream of water at it. Interestingly, the fish demonstrated a human-like "volitional" facilitation effect: their reaction times to targets that appeared on the side indicated by the precue were faster than their reaction times to targets on the opposite side. The fish also exhibited inhibition of return, an aftermath of orienting that commonly emerges only in reflexive orienting tasks in human participants. We believe that this pattern demonstrates the acquisition of an arbitrary connection between spatial orienting and a nonspatial feature of a centrally presented stimulus in nonprimate species. In the literature on human attention, orienting in response to such contingencies has been strongly associated with volitional control. We discuss the implications of these results for the evolution of orienting, and for the study of volitional processes in all species, including humans.
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Affiliation(s)
- William Saban
- Department of Psychology, University of Haifa, Haifa, Israel 3498838;
- The Institute of Information Processing and Decision Making, University of Haifa, Haifa, Israel 3498838
| | - Liora Sekely
- Department of Psychology, University of Haifa, Haifa, Israel 3498838
- The Institute of Information Processing and Decision Making, University of Haifa, Haifa, Israel 3498838
| | - Raymond M Klein
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| | - Shai Gabay
- Department of Psychology, University of Haifa, Haifa, Israel 3498838;
- The Institute of Information Processing and Decision Making, University of Haifa, Haifa, Israel 3498838
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Khan KM, Collier AD, Meshalkina DA, Kysil EV, Khatsko SL, Kolesnikova T, Morzherin YY, Warnick JE, Kalueff AV, Echevarria DJ. Zebrafish models in neuropsychopharmacology and CNS drug discovery. Br J Pharmacol 2017; 174:1925-1944. [PMID: 28217866 PMCID: PMC5466539 DOI: 10.1111/bph.13754] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 02/11/2017] [Accepted: 02/14/2017] [Indexed: 12/12/2022] Open
Abstract
Despite the high prevalence of neuropsychiatric disorders, their aetiology and molecular mechanisms remain poorly understood. The zebrafish (Danio rerio) is increasingly utilized as a powerful animal model in neuropharmacology research and in vivo drug screening. Collectively, this makes zebrafish a useful tool for drug discovery and the identification of disordered molecular pathways. Here, we discuss zebrafish models of selected human neuropsychiatric disorders and drug-induced phenotypes. As well as covering a broad range of brain disorders (from anxiety and psychoses to neurodegeneration), we also summarize recent developments in zebrafish genetics and small molecule screening, which markedly enhance the disease modelling and the discovery of novel drug targets.
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Affiliation(s)
- Kanza M Khan
- Department of PsychologyUniversity of Southern MississippiHattiesburgMSUSA
| | - Adam D Collier
- Department of PsychologyUniversity of Southern MississippiHattiesburgMSUSA
- The International Zebrafish Neuroscience Research Consortium (ZNRC)SlidellLAUSA
| | - Darya A Meshalkina
- The International Zebrafish Neuroscience Research Consortium (ZNRC)SlidellLAUSA
- Institute of Translational BiomedicineSt. Petersburg State UniversitySt. PetersburgRussia
| | - Elana V Kysil
- Institute of Translational BiomedicineSt. Petersburg State UniversitySt. PetersburgRussia
| | | | | | | | - Jason E Warnick
- The International Zebrafish Neuroscience Research Consortium (ZNRC)SlidellLAUSA
- Department of Behavioral SciencesArkansas Tech UniversityRussellvilleARUSA
| | - Allan V Kalueff
- The International Zebrafish Neuroscience Research Consortium (ZNRC)SlidellLAUSA
- Institute of Translational BiomedicineSt. Petersburg State UniversitySt. PetersburgRussia
- Ural Federal UniversityEkaterinburgRussia
- Research Institute of Marine Drugs and Nutrition, College of Food Science and TechnologyGuangdong Ocean UniversityZhanjiangGuangdongChina
| | - David J Echevarria
- Department of PsychologyUniversity of Southern MississippiHattiesburgMSUSA
- The International Zebrafish Neuroscience Research Consortium (ZNRC)SlidellLAUSA
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70
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Yamamoto K, Bloch S, Vernier P. New perspective on the regionalization of the anterior forebrain in Osteichthyes. Dev Growth Differ 2017; 59:175-187. [PMID: 28470718 DOI: 10.1111/dgd.12348] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 02/26/2017] [Accepted: 03/13/2017] [Indexed: 01/19/2023]
Abstract
In the current model, the most anterior part of the forebrain (secondary prosencephalon) is subdivided into the telencephalon dorsally and the hypothalamus ventrally. Our recent study identified a new morphogenetic unit named the optic recess region (ORR) between the telencephalon and the hypothalamus. This modification of the forebrain regionalization based on the ventricular organization resolved some previously unexplained inconsistency about regional identification in different vertebrate groups. The ventricular-based comparison also revealed a large diversity within the subregions (notably in the hypothalamus and telencephalon) among different vertebrate groups. In tetrapods there is only one hypothalamic recess, while in teleosts there are two recesses. Most notably, the mammalian and teleost hypothalami are two extreme cases: the former has lost the cerebrospinal fluid-contacting (CSF-c) neurons, while the latter has increased them. Thus, one to one homology of hypothalamic subregions in mammals and teleosts requires careful verification. In the telencephalon, different developmental processes between Sarcopterygii (lobe-finned fish) and Actinopterygii (ray-finned fish) have already been described: the evagination and the eversion. Although pallial homology has been long discussed based on the assumption that the medial-lateral organization of the pallium in Actinopterygii is inverted from that in Sarcopterygii, recent developmental data contradict this assumption. Current models of the brain organization are largely based on a mammalian-centric point of view, but our comparative analyses shed new light on the brain organization of Osteichthyes.
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Affiliation(s)
- Kei Yamamoto
- Paris-Saclay Institute of Neuroscience (UMR 9197), CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, 91190, France
| | - Solal Bloch
- Paris-Saclay Institute of Neuroscience (UMR 9197), CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, 91190, France
| | - Philippe Vernier
- Paris-Saclay Institute of Neuroscience (UMR 9197), CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, 91190, France
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71
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Hosono K, Yamashita J, Kikuchi Y, Hiraki-Kajiyama T, Okubo K. Three urocortins in medaka: identification and spatial expression in the central nervous system. J Neuroendocrinol 2017; 29. [PMID: 28370873 DOI: 10.1111/jne.12472] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 02/10/2017] [Accepted: 03/25/2017] [Indexed: 12/19/2022]
Abstract
The urocortin (UCN) group of neuropeptides includes urocortin 1/sauvagine/urotensin 1 (UTS1), urocortin 2 (UCN2) and urocortin 3 (UCN3). In recent years, evidence has accumulated showing that UCNs play pivotal roles in mediating stress response and anxiety in mammals. Evidence has also emerged regarding the evolutionary conservation of UCNs in vertebrates, but very little information is available about UCNs in non-mammalian vertebrates. Indeed, at present, there are no reports of the empirical identification of ucn2 in non-mammalian vertebrates or of the distribution of ucn2 and ucn3 expression in the adult central nervous system (CNS) of these animals. To gain insight into the evolutionary nature of UCNs in vertebrates, we cloned uts1, ucn2 and ucn3 in a teleost fish, medaka and examined the spatial expression of these genes in the adult brain and spinal cord. Although all known UCN2 genes except those in rodents have been reported to likely lack the necessary structural features to produce a functional pre-pro-protein, all three UCN genes in medaka, including ucn2, displayed all of these features, suggesting their functionality. The three UCN genes exhibited distinct spatial expression patterns in the medaka brain: uts1 was primarily expressed in broad regions of the dorsal telencephalon, ucn2 was expressed in restricted regions of the thalamus and brainstem and ucn3 was expressed in discrete nuclei throughout many regions of the brain. We also found that these genes were all expressed throughout the medaka spinal cord, each with a distinct spatial pattern. Given that many of these regions have been implicated in stress responses and anxiety, the three UCNs may serve distinct physiological roles in the medaka CNS, including those involved in stress and anxiety, as shown in the mammalian CNS.
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Affiliation(s)
- K Hosono
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - J Yamashita
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - Y Kikuchi
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - T Hiraki-Kajiyama
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
- RIKEN Brain Science Institute, Wako, Saitama, Japan
| | - K Okubo
- Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, Japan
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72
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Cannabinoid modulation of zebrafish fear learning and its functional analysis investigated by c-Fos expression. Pharmacol Biochem Behav 2016; 153:18-31. [PMID: 27965084 DOI: 10.1016/j.pbb.2016.12.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/05/2016] [Accepted: 12/09/2016] [Indexed: 12/31/2022]
Abstract
It has been shown that zebrafish fear learning proceeds in the same way as reported for rodents. However, in zebrafish fear learning it is possible to substitute the use of electric shocks as unconditioned stimulus and utilize the inborn fear responses to the alarm substance Schreckstoff, instead. The skin extract Schreckstoff elicits typical fear reactions such as preferred bottom dwelling, swimming in a tighter shoal, erratic movements and freezing. This natural fear behavior can be transferred from Schreckstoff to any other sensory stimulus by associative conditioning (fear learning). We presented Schreckstoff simultaneously with a red light stimulus and tested the effectiveness of fear learning during memory retrieval. The two brain regions known to be relevant for learning in zebrafish are the medial and the lateral pallium of the dorsal telencephalon, both containing rich expressions of the endocannabinoid receptor CB1. To test the influence of the zebrafish endocannabinoid system on fear acquisition learning, an experimental group of ten fish was pretreated with the CB1 receptor agonist THC (Δ9-tetrahydrocannabinol; 100nM for 1h). We found that CB1 activation significantly inhibited acquisition of fear learning, possibly by impairing stimulus encoding processes in pallial areas. This was supported by analyzes of c-Fos expression in the brains of experimental animals. Schreckstoff exposure during fear acquisition learning and memory retrieval during red light presentation increased the number of labelled cells in pallial structures, but in no other brain region investigated (e.g. striatum, thalamus, and habenula). THC administration before fear conditioning significantly decreased c-Fos expression in these structures to a level similar to the control group without Schreckstoff experience, suggesting that Schreckstoff induced fear learning requires brain circuits restricted mainly to pallial regions of the dorsal telencephalon.
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73
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Karoubi N, Segev R, Wullimann MF. The Brain of the Archerfish Toxotes chatareus: A Nissl-Based Neuroanatomical Atlas and Catecholaminergic/Cholinergic Systems. Front Neuroanat 2016; 10:106. [PMID: 27891081 PMCID: PMC5104738 DOI: 10.3389/fnana.2016.00106] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 10/13/2016] [Indexed: 01/30/2023] Open
Abstract
Over recent years, the seven-spot archerfish (Toxotes chatareus) has emerged as a new model for studies in visual and behavioral neuroscience thanks to its unique hunting strategy. Its natural ability to spit at insects outside of water can be used in the laboratory for well controlled behavioral experiments where the fish is trained to aim at targets on a screen. The need for a documentation of the neuroanatomy of this animal became critical as more research groups use it as a model. Here we present an atlas of adult T. chatareus specimens caught in the wild in South East Asia. The atlas shows representative sections of the brain and specific structures revealed by a classic Nissl staining as well as corresponding schematic drawings. Additional immunostainings for catecholaminergic and cholinergic systems were conducted to corroborate the identification of certain nuclei and the data of a whole brain scanner is available online. We describe the general features of the archerfish brain as well as its specificities, especially for the visual system and compare the neuroanatomy of the archerfish with other teleosts. This atlas of the archerfish brain shows all levels of the neuraxis and intends to provide a solid basis for further neuroscientific research on T. chatareus, in particular electrophysiological studies.
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Affiliation(s)
- Naomi Karoubi
- Life Sciences Department and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev Beersheba, Israel
| | - Ronen Segev
- Life Sciences Department and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev Beersheba, Israel
| | - Mario F Wullimann
- Graduate School of Systemic Neurosciences and Division of Neurobiology, Department Biology II, Ludwig-Maximilians-University of Munich Munich, Germany
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74
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Messias JPM, Santos TP, Pinto M, Soares MC. Stimulation of dopamine D₁ receptor improves learning capacity in cooperating cleaner fish. Proc Biol Sci 2016; 283:rspb.2015.2272. [PMID: 26791613 DOI: 10.1098/rspb.2015.2272] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Accurate contextual decision-making strategies are important in social environments. Specific areas in the brain are tasked to process these complex interactions and generate correct follow-up responses. The dorsolateral and dorsomedial parts of the telencephalon in the teleost fish brain are neural substrates modulated by the neurotransmitter dopamine (DA), and are part of an important neural circuitry that drives animal behaviour from the most basic actions such as learning to search for food, to properly choosing partners and managing decisions based on context. The Indo-Pacific cleaner wrasse Labroides dimidiatus is a highly social teleost fish species with a complex network of interactions with its 'client' reef fish. We asked if changes in DA signalling would affect individual learning ability by presenting cleaner fish two ecologically different tasks that simulated a natural situation requiring accurate decision-making. We demonstrate that there is an involvement of the DA system and D1 receptor pathways on cleaners' natural abilities to learn both tasks. Our results add significantly to the growing literature on the physiological mechanisms that underlie and facilitate the expression of cooperative abilities.
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Affiliation(s)
- João P M Messias
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal
| | - Teresa P Santos
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal
| | - Maria Pinto
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal
| | - Marta C Soares
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal
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75
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Rey S, Huntingford FA, Boltaña S, Vargas R, Knowles TG, Mackenzie S. Fish can show emotional fever: stress-induced hyperthermia in zebrafish. Proc Biol Sci 2016; 282:rspb.2015.2266. [PMID: 26609087 PMCID: PMC4685827 DOI: 10.1098/rspb.2015.2266] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Whether fishes are sentient beings remains an unresolved and controversial question. Among characteristics thought to reflect a low level of sentience in fishes is an inability to show stress-induced hyperthermia (SIH), a transient rise in body temperature shown in response to a variety of stressors. This is a real fever response, so is often referred to as ‘emotional fever’. It has been suggested that the capacity for emotional fever evolved only in amniotes (mammals, birds and reptiles), in association with the evolution of consciousness in these groups. According to this view, lack of emotional fever in fishes reflects a lack of consciousness. We report here on a study in which six zebrafish groups with access to a temperature gradient were either left as undisturbed controls or subjected to a short period of confinement. The results were striking: compared to controls, stressed zebrafish spent significantly more time at higher temperatures, achieving an estimated rise in body temperature of about 2–4°C. Thus, zebrafish clearly have the capacity to show emotional fever. While the link between emotion and consciousness is still debated, this finding removes a key argument for lack of consciousness in fishes.
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Affiliation(s)
- Sonia Rey
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Felicity A Huntingford
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK
| | - Sebastian Boltaña
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Reynaldo Vargas
- Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Toby G Knowles
- School of Veterinary Science, University of Bristol, Langford, Bristol BS40 5DU, UK
| | - Simon Mackenzie
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
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Conway Morris S. It all adds up …. Or does it? Numbers, mathematics and purpose. STUDIES IN HISTORY AND PHILOSOPHY OF BIOLOGICAL AND BIOMEDICAL SCIENCES 2016; 58:117-122. [PMID: 26783082 DOI: 10.1016/j.shpsc.2015.12.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
No chimpanzee knows what a square root is, let alone a complex number. Yet not only our closest ape cousins but even some invertebrates, possess a capacity for numerosity, that is the ability to assess relative numerical magnitudes and distances. That numerosity should confer adaptive advantages, such as social species that choose shoal size, is obvious. Moreover, it is widely assumed that numerosity and mathematics are seamlessly linked, as would be consistent with Darwinian notions of descent and modification. Animal numerosity, however, involves sensory processes (usually vision, but other modalities such as olfaction can be as effective) that follow psychophysical principles, notable the Weber-Fechner law. In contrast, mathematics may require sensory mediation but is an abstract process. The supposed connection between these processes is described as supramodality but the mechanisms that allow humans, but not animals, to engage in even simple mathematics are opaque. Here, I argue that any resolution will depend on proper explanations for not only mathematics, but language and by implication consciousness. In this light, concepts of purpose are not intellectual mirages but legitimate descriptions of the worlds in which we are embedded. These are both visible (and tangible) and invisible (and although intangible, equally real).
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Affiliation(s)
- Simon Conway Morris
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, England, United Kingdom.
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Barbosa JS, Ninkovic J. Adult neural stem cell behavior underlying constitutive and restorative neurogenesis in zebrafish. NEUROGENESIS 2016; 3:e1148101. [PMID: 27606336 PMCID: PMC4973591 DOI: 10.1080/23262133.2016.1148101] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 01/20/2016] [Accepted: 01/21/2016] [Indexed: 01/11/2023]
Abstract
Adult Neural Stem Cells (aNSCs) generate new neurons that integrate into the pre-existing networks in specific locations of the Vertebrate brain. Moreover, aNSCs contribute with new neurons to brain regeneration in some non-mammalian Vertebrates. The similarities and the differences in the cellular and molecular processes governing neurogenesis in the intact and regenerating brain are still to be assessed. Toward this end, we recently established a protocol for non-invasive imaging of aNSC behavior in their niche in vivo in the adult intact and regenerating zebrafish telencephalon. We observed different modes of aNSC division in the intact brain and a novel mode of neurogenesis by direct conversion, which contributes to stem cell depletion with age. After injury, the generation of neurons is increased both by the activation of additional aNSCs and a shift in the division mode of aNSCs, thereby contributing to the successful neuronal regeneration. The cellular behavior we observed opens new questions regarding long-term aNSC maintenance in homeostasis and in regeneration. In this commentary we discuss our data and new questions arising in the context of aNSC behavior, not only in zebrafish but also in other species, including mammals.
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Affiliation(s)
- Joana S Barbosa
- Institute of Stem Cell Research, Helmholtz Center, Munich, Germany; PhD Program in Biomedicine and Experimental Biology (BEB), Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Jovica Ninkovic
- Institute of Stem Cell Research, Helmholtz Center, Munich, Germany; Biomedical Center, University of Munich, Germany; Excellence Cluster of Systems Neurology SYNERGY, LMU
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78
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Gaffney LP, Franks B, Weary DM, von Keyserlingk MAG. Coho Salmon (Oncorhynchus kisutch) Prefer and Are Less Aggressive in Darker Environments. PLoS One 2016; 11:e0151325. [PMID: 27028731 PMCID: PMC4814047 DOI: 10.1371/journal.pone.0151325] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 02/27/2016] [Indexed: 11/18/2022] Open
Abstract
Fish are capable of excellent vision and can be profoundly influenced by the visual properties of their environment. Ambient colours have been found to affect growth, survival, aggression and reproduction, but the effect of background darkness (i.e., the darkness vs. lightness of the background) on preference and aggression has not been evaluated systematically. One-hundred Coho salmon (Oncorhynchus kisutch), a species that is increasing in popularity in aquaculture, were randomly assigned to 10 tanks. Using a Latin-square design, every tank was bisected to allow fish in each tank to choose between all the following colour choices (8 choices in total): black vs. white, light grey, dark grey, and a mixed dark grey/black pattern, as well as industry-standard blue vs. white, light grey, dark grey, and black. Fish showed a strong preference for black backgrounds over all other options (p < 0.01). Across tests, preference strength increased with background darkness (p < 0.0001). Moreover, having darker backgrounds in the environment resulted in less aggressive behaviour throughout the tank (p < 0.0001). These results provide the first evidence that darker tanks are preferred by and decrease aggression in salmonids, which points to the welfare benefits of housing farmed salmon in enclosures containing dark backgrounds.
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Affiliation(s)
- Leigh P. Gaffney
- Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z6, Canada
| | - Becca Franks
- Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z6, Canada
| | - Daniel M. Weary
- Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z6, Canada
| | - Marina A. G. von Keyserlingk
- Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z6, Canada
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Dunlap KD, Tran A, Ragazzi MA, Krahe R, Salazar VL. Predators inhibit brain cell proliferation in natural populations of electric fish, Brachyhypopomus occidentalis. Proc Biol Sci 2016; 283:20152113. [PMID: 26842566 PMCID: PMC4760157 DOI: 10.1098/rspb.2015.2113] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 01/08/2016] [Indexed: 11/12/2022] Open
Abstract
Compared with laboratory environments, complex natural environments promote brain cell proliferation and neurogenesis. Predators are one important feature of many natural environments, but, in the laboratory, predatory stimuli tend to inhibit brain cell proliferation. Often, laboratory predatory stimuli also elevate plasma glucocorticoids, which can then reduce brain cell proliferation. However, it is unknown how natural predators affect cell proliferation or whether glucocorticoids mediate the neurogenic response to natural predators. We examined brain cell proliferation in six populations of the electric fish, Brachyhypopomus occidentalis, exposed to three forms of predator stimuli: (i) natural variation in the density of predatory catfish; (ii) tail injury, presumably from predation attempts; and (iii) the acute stress of capture. Populations with higher predation pressure had lower density of proliferating (PCNA+) cells, and fish with injured tails had lower proliferating cell density than those with intact tails. However, plasma cortisol did not vary at the population level according to predation pressure or at the individual level according to tail injury. Capture stress significantly increased cortisol, but only marginally decreased cell proliferation. Thus, it appears that the presence of natural predators inhibits brain cell proliferation, but not via mechanisms that depend on changes in basal cortisol levels. This study is the first demonstration of predator-induced alteration of brain cell proliferation in a free-living vertebrate.
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Affiliation(s)
- Kent D Dunlap
- Department of Biology, Trinity College, Hartford, CT 06106, USA
| | - Alex Tran
- Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1
| | | | - Rüdiger Krahe
- Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1
| | - Vielka L Salazar
- Department of Biology, Cape Breton University, Sydney, Nova Scotia, Canada B1P 6L2
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Perathoner S, Cordero-Maldonado ML, Crawford AD. Potential of zebrafish as a model for exploring the role of the amygdala in emotional memory and motivational behavior. J Neurosci Res 2016; 94:445-62. [DOI: 10.1002/jnr.23712] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 12/22/2015] [Accepted: 12/22/2015] [Indexed: 01/18/2023]
Affiliation(s)
- Simon Perathoner
- Luxembourg Centre for Systems Biomedicine (LCSB); University of Luxembourg; Belvaux Luxembourg
| | | | - Alexander D. Crawford
- Luxembourg Centre for Systems Biomedicine (LCSB); University of Luxembourg; Belvaux Luxembourg
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81
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Moltesen M, Vindas MA, Winberg S, Ebbesson L, de Lourdes Ruiz-Gomez M, Skov PV, Dabelsteen T, Øverli Ø, Höglund E. Cognitive appraisal of aversive stimulus differs between individuals with contrasting stress coping styles; evidences from selected rainbow trout (Oncorhynchus mykiss) strains. BEHAVIOUR 2016. [DOI: 10.1163/1568539x-00003405] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In animals, personality variations in response to stress and energy demands have been established. Cognitive processing of negative stimuli correlates with stress response patterns. Still, the relative contribution of cognitive appraisal or physiological demands to the behavioural output needs to be clarified. In this study we utilized reactive (high-responsive, HR) and proactive (low-responsive, LR) rainbow trout strains to investigate how contrasting reactions to hypoxia are related to individual variation in metabolism and/or cognition. The HR-LR strains did not differ in standard metabolic rate or hypoxia tolerance. HR trout displayed more pronounced avoidance to a signal cue after being conditioned with hypoxia, suggesting that they experienced this stimulus more aversive than LR trout. Together with differences in forebrain c-fos activation patterns in dorsomedial pallium, these results suggest cognitive differences between the strains. These results demonstrate that differences in personality/stress coping style can be related to contrasts in cognition, which are independent of metabolic differences.
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Affiliation(s)
- Maria Moltesen
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, building 3, 4th floor, DK-2100 Copenhagen Ø, Denmark
- Section for Aquaculture, Institute for Aquatic Resources, Danish Technical University, P.O. Box 101, DK-9850 Hirtshals, Denmark
| | - Marco Antonio Vindas
- Integrative Fish Biology, Uni Research Environment, Uni Research, P.O. Box 7803, NO-5020 Bergen, Norway
| | - Svante Winberg
- Department of Neuroscience, Uppsala University, P.O. Box 593, SE-75124 Uppsala, Sweden
| | - Lars Ebbesson
- Integrative Fish Biology, Uni Research Environment, Uni Research, P.O. Box 7803, NO-5020 Bergen, Norway
| | - Maria de Lourdes Ruiz-Gomez
- Facultad de Ciencias, Universidad Autónoma del Estado de Mexico, Instituto Literario Numero 100 Centro, Toluca, C.P. 50000, Mexico
| | - Peter Vilhelm Skov
- Section for Aquaculture, Institute for Aquatic Resources, Danish Technical University, P.O. Box 101, DK-9850 Hirtshals, Denmark
| | - Torben Dabelsteen
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, building 3, 4th floor, DK-2100 Copenhagen Ø, Denmark
| | - Øyvind Øverli
- Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway
| | - Erik Höglund
- Section for Aquaculture, Institute for Aquatic Resources, Danish Technical University, P.O. Box 101, DK-9850 Hirtshals, Denmark
- Niva Region South, Norsk institutt for vannforskning, Gaustadalléen 21, NO-0349 Oslo, Norway
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83
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Expression of the Transcription Factor Pax6 in the Lobe of the Facial Nerve of the Carp Brain. NEUROPHYSIOLOGY+ 2015. [DOI: 10.1007/s11062-015-9534-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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85
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Maximino C, Silva RXDC, da Silva SDNS, Rodrigues LDSDS, Barbosa H, de Carvalho TS, Leão LKDR, Lima MG, Oliveira KRM, Herculano AM. Non-mammalian models in behavioral neuroscience: consequences for biological psychiatry. Front Behav Neurosci 2015; 9:233. [PMID: 26441567 PMCID: PMC4561806 DOI: 10.3389/fnbeh.2015.00233] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 08/18/2015] [Indexed: 01/04/2023] Open
Abstract
Current models in biological psychiatry focus on a handful of model species, and the majority of work relies on data generated in rodents. However, in the same sense that a comparative approach to neuroanatomy allows for the identification of patterns of brain organization, the inclusion of other species and an adoption of comparative viewpoints in behavioral neuroscience could also lead to increases in knowledge relevant to biological psychiatry. Specifically, this approach could help to identify conserved features of brain structure and behavior, as well as to understand how variation in gene expression or developmental trajectories relates to variation in brain and behavior pertinent to psychiatric disorders. To achieve this goal, the current focus on mammalian species must be expanded to include other species, including non-mammalian taxa. In this article, we review behavioral neuroscientific experiments in non-mammalian species, including traditional "model organisms" (zebrafish and Drosophila) as well as in other species which can be used as "reference." The application of these domains in biological psychiatry and their translational relevance is considered.
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Affiliation(s)
- Caio Maximino
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
| | - Rhayra Xavier do Carmo Silva
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
| | - Suéllen de Nazaré Santos da Silva
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
| | - Laís do Socorro dos Santos Rodrigues
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
| | - Hellen Barbosa
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
| | - Tayana Silva de Carvalho
- Universität Duisburg-EssenEssen, Germany
- Laboratório de Neurofarmacologia Experimental, Instituto de Ciências Biológicas, Universidade Federal do ParáBelém, Brazil
| | - Luana Ketlen dos Reis Leão
- Laboratório de Neurofarmacologia Experimental, Instituto de Ciências Biológicas, Universidade Federal do ParáBelém, Brazil
| | - Monica Gomes Lima
- Laboratório de Neurociências e Comportamento, Departamento de Morfologia e Ciências Fisiológicas, Campus VIII – Marabá, Universidade do Estado do ParáMarabá, Brazil
- Laboratório de Neurofarmacologia Experimental, Instituto de Ciências Biológicas, Universidade Federal do ParáBelém, Brazil
| | - Karen Renata Matos Oliveira
- Laboratório de Neurofarmacologia Experimental, Instituto de Ciências Biológicas, Universidade Federal do ParáBelém, Brazil
| | - Anderson Manoel Herculano
- Laboratório de Neurofarmacologia Experimental, Instituto de Ciências Biológicas, Universidade Federal do ParáBelém, Brazil
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Uceda S, Ocaña FM, Martín-Monzón I, Rodríguez-Expósito B, Durán E, Rodríguez F. Spatial learning-related changes in metabolic brain activity contribute to the delimitation of the hippocampal pallium in goldfish. Behav Brain Res 2015; 292:403-8. [PMID: 26142782 DOI: 10.1016/j.bbr.2015.06.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 05/29/2015] [Accepted: 06/08/2015] [Indexed: 01/17/2023]
Abstract
Comparative neuroanatomical, developmental and functional evidence suggests that the lateral division of the area dorsalis telencephali (Dl) of the teleost fish is homologous to the hippocampus of tetrapods. Nonetheless, some important aspects of the organization of the hippocampal pallium of teleosts are still under discussion and conflicting hypotheses regarding the extension and demarcation of this region have been proposed. Thus, whereas some authors suggest that the entire Dl region, including its dorsal (Dld) and ventral (Dlv) subdivisions, is homologue to the mammalian hippocampus, others claim that only Dlv should be considered as such. To further elucidate this debate, we investigated the role of Dld and Dlv in one of the most unambiguous functions of the hippocampus, spatial learning. We trained goldfish in a spatial constancy task and mapped the activity of Dld, Dlv, and the medial division of the area dorsalis telencephali (Dm) by means of cytochrome oxidase (CO) histochemistry. The results revealed that training goldfish in the spatial constancy task significantly increased the metabolic activity in Dlv, but not in Dld or Dm, suggesting that only Dlv is critically involved in spatial learning and in this regard comparable to the hippocampus. These data provide additional functional support to the hypotheses that consider Dl as a heterogeneous pallial region and propose that Dlv, but not Dld, might be homologous to the hippocampus.
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Affiliation(s)
- S Uceda
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain.
| | - F M Ocaña
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain
| | - I Martín-Monzón
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain
| | - B Rodríguez-Expósito
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain
| | - E Durán
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain
| | - F Rodríguez
- Laboratory of Psychobiology, University of Sevilla, Campus Santiago Ramón y Cajal, 41018, Sevilla, Spain
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GABAA-benzodiazepine receptors in the dorsomedial (Dm) telencephalon modulate restraint-induced antinociception in the fish Leporinus macrocephalus. Physiol Behav 2015; 147:175-82. [PMID: 25914173 DOI: 10.1016/j.physbeh.2015.04.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 04/16/2015] [Accepted: 04/21/2015] [Indexed: 01/08/2023]
Abstract
The possibility that fish experience pain has been denied based on the absence of the neural substrates to support this "experience". In this context, the identification of brain regions involved in nociception modulation could provide important insights regarding the processing of nociceptive information in fish. Our study evaluated the participation of the GABAA-benzodiazepine receptor in the dorsomedial (Dm) telencephalon in restraint-induced antinociception in the fish Leporinus macrocephalus through the microinjection of the anxiolytic drug midazolam. The microinjection of midazolam in the Dm did not alter the nocifensive response; however, this drug did block the inhibition of the nocifensive response to formaldehyde promoted by restraint stress. The fish that received midazolam (40nmol) microinjection prior to restraint (3 or 5min), followed by subcutaneous injection with formaldehyde presented a higher distance traveled than the fish that received saline microinjection. This effect might reflect the specific action of midazolam on benzodiazepine receptors in the Dm telencephalon, as pre-treatment with flumazenil, a benzodiazepine receptor antagonist, inhibited the effects of this drug. In the present study, we present the first evidence demonstrating a role for the dorsomedial telencephalic region in the modulation of stress-induced antinociception in fish, revealing new perspectives in the understanding of nociceptive information processing in this group.
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88
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White GE, Brown C. Microhabitat use affects brain size and structure in intertidal gobies. BRAIN, BEHAVIOR AND EVOLUTION 2015; 85:107-16. [PMID: 25896449 DOI: 10.1159/000380875] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 03/17/2014] [Indexed: 11/19/2022]
Abstract
The ecological cognition hypothesis poses that the brains and behaviours of individuals are largely shaped by the environments in which they live and the associated challenges they must overcome during their lives. Here we examine the effect of environmental complexity on relative brain size in 4 species of intertidal gobies from differing habitats. Two species were rock pool specialists that lived on spatially complex rocky shores, while the remainder lived on dynamic, but structurally simple, sandy shores. We found that rock pool-dwelling species had relatively larger brains and telencephalons in particular, while sand-dwelling species had a larger optic tectum and hypothalamus. In general, it appears that various fish species trade off neural investment in specific brain lobes depending on the environment in which they live. Our previous research suggests that rock pool species have greater spatial learning abilities, enabling them to navigate their spatially complex environment, which may account for their enlarged telencephalon, while sand-dwelling species likely have a reduced need for spatial learning, due to their spatially simple habitat, and a greater need for visual acuity. The dorsal medulla and cerebellum size was unaffected by the habitat in which the fish lived, but there were differences between species indicative of species-specific trade-offs in neural investment.
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Affiliation(s)
- Gemma E White
- Department of Biological Sciences, Macquarie University, North Ryde, N.S.W., Australia
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89
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Aoki R, Tsuboi T, Okamoto H. Y-maze avoidance: An automated and rapid associative learning paradigm in zebrafish. Neurosci Res 2015; 91:69-72. [DOI: 10.1016/j.neures.2014.10.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 10/14/2014] [Accepted: 10/17/2014] [Indexed: 11/28/2022]
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90
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Key B. Fish do not feel pain and its implications for understanding phenomenal consciousness. BIOLOGY & PHILOSOPHY 2014; 30:149-165. [PMID: 25798021 PMCID: PMC4356734 DOI: 10.1007/s10539-014-9469-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 12/06/2014] [Indexed: 05/28/2023]
Abstract
Phenomenal consciousness or the subjective experience of feeling sensory stimuli is fundamental to human existence. Because of the ubiquity of their subjective experiences, humans seem to readily accept the anthropomorphic extension of these mental states to other animals. Humans will typically extrapolate feelings of pain to animals if they respond physiologically and behaviourally to noxious stimuli. The alternative view that fish instead respond to noxious stimuli reflexly and with a limited behavioural repertoire is defended within the context of our current understanding of the neuroanatomy and neurophysiology of mental states. Consequently, a set of fundamental properties of neural tissue necessary for feeling pain or experiencing affective states in vertebrates is proposed. While mammals and birds possess the prerequisite neural architecture for phenomenal consciousness, it is concluded that fish lack these essential characteristics and hence do not feel pain.
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Affiliation(s)
- Brian Key
- School of Biomedical Sciences, University of Queensland, Brisbane, 4072 Australia
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91
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Acute administration of THC impairs spatial but not associative memory function in zebrafish. Psychopharmacology (Berl) 2014; 231:3829-42. [PMID: 24639045 DOI: 10.1007/s00213-014-3522-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 02/24/2014] [Indexed: 01/19/2023]
Abstract
RATIONALE The present study examined the effect of acute administration of endocannabinoid receptor CB1 ligand ∆-9-tetrahydrocannabinol (THC) on intracellular signalling in the brain and retrieval from two different memory systems in the zebrafish (Danio rerio). METHODS First, fish were treated with THC and changes in the phosphorylation level of mitogen-activated protein (MAP) kinases Akt and Erk in the brain were determined 1 h after drug treatment. Next, animals of a second group learned in a two-alternative choice paradigm to discriminate between two colours, whereas a third group solved a spatial cognition task in an open-field maze by use of an ego-allocentric strategy. After memory acquisition and consolidation, animals were pharmacologically treated using the treatment regime as in the first group and then tested again for memory retrieval. RESULTS We found an enhanced Erk but not Akt phosphorylation suggesting that THC treatment specifically activated Erk signalling in the zebrafish telencephalon. While CB1 agonist THC did not affect behavioural performance of animals in the colour discrimination paradigm, spatial memory was significantly impaired. The effect of THC on spatial learning is probably specific, since neither motor activity nor anxiety-related behaviour was influenced by the drug treatment. That indicates a striking influence of the endocannabinoid system (ECS) on spatial cognition in zebrafish. CONCLUSIONS The results are very coincident with reports on mammals, demonstrating that the ECS is functional highly conserved during vertebrate evolution. We further conclude that the zebrafish provides a promising model organism for ongoing research on the ECS.
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92
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von Trotha JW, Vernier P, Bally-Cuif L. Emotions and motivated behavior converge on an amygdala-like structure in the zebrafish. Eur J Neurosci 2014; 40:3302-15. [PMID: 25145867 PMCID: PMC4278443 DOI: 10.1111/ejn.12692] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 07/05/2014] [Accepted: 07/11/2014] [Indexed: 01/23/2023]
Abstract
The brain reward circuitry plays a key role in emotional and motivational behaviors, and its dysfunction underlies neuropsychiatric disorders such as schizophrenia, depression and drug addiction. Here, we characterized the neuronal activity pattern induced by acute amphetamine administration and during drug-seeking behavior in the zebrafish, and demonstrate the existence of conserved underlying brain circuitry. Combining quantitative analyses of cfos expression with neuronal subtype-specific markers at single-cell resolution, we show that acute d-amphetamine administration leads to both increased neuronal activation and the recruitment of neurons in the medial (Dm) and the lateral (Dl) domains of the adult zebrafish pallium, which contain homologous structures to the mammalian amygdala and hippocampus, respectively. Calbindin-positive and glutamatergic neurons are recruited in Dm, and glutamatergic and γ-aminobutyric acid (GABAergic) neurons in Dl. The drug-activated neurons in Dm and Dl are born at juvenile stage rather than in the embryo or during adulthood. Furthermore, the same territory in Dm is activated during both drug-seeking approach and light avoidance behavior, while these behaviors do not elicit activation in Dl. These data identify the pallial territories involved in acute psychostimulant response and reward formation in the adult zebrafish. They further suggest an evolutionarily conserved function of amygdala-like structures in positive emotions and motivated behavior in zebrafish and mammals.
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Affiliation(s)
- Jakob William von Trotha
- Institute of Neurobiology A. Fessard, Laboratory of Neurobiology and Development, CNRS UPR3294, Team Zebrafish Neurogenetics, Avenue de la Terrasse, bldg 5, F-91198, Gif-sur-Yvette, France
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Avoidance conditioning in bamboo sharks (Chiloscyllium griseum and C. punctatum): behavioral and neuroanatomical aspects. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2014; 199:843-56. [PMID: 23958858 DOI: 10.1007/s00359-013-0847-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 08/06/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
Abstract
Animals face different threats; to survive, they have to anticipate how to react or how to avoid these. It has already been shown in teleosts that selected regions in the telencephalon, i.e., the medial pallium, are involved in avoidance learning strategies. No such study exists for any chondrichthyan. In nature, an avoidance reaction may vary, ranging from a ‘freeze’ reaction to a startling response and quick escape. This study investigated whether elasmobranchs (Chiloscylliumgriseum and C. punctatum) can be conditioned in an aversive classical conditioning paradigm. Upon successful conditioning, the dorsal, medial and lateral pallium were removed (group 1) and performance tested again. In a second group, the same operation was performed prior to training. While conditioning was successful in individuals of both groups, no escape responses were observed. Post-operative performance was assessed and compared between individual and groups to reveal if the neural substrates governing avoidance behavior or tasks learned in a classical conditioning paradigm are located within the telencephalon, as has been shown for teleosts such as goldfish.
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94
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Cheng RK, Jesuthasan SJ, Penney TB. Zebrafish forebrain and temporal conditioning. Philos Trans R Soc Lond B Biol Sci 2014; 369:20120462. [PMID: 24446496 DOI: 10.1098/rstb.2012.0462] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The rise of zebrafish as a neuroscience research model organism, in conjunction with recent progress in single-cell resolution whole-brain imaging of larval zebrafish, opens a new window of opportunity for research on interval timing. In this article, we review zebrafish neuroanatomy and neuromodulatory systems, with particular focus on identifying homologies between the zebrafish forebrain and the mammalian forebrain. The neuroanatomical and neurochemical basis of interval timing is summarized with emphasis on the potential of using zebrafish to reveal the neural circuits for interval timing. The behavioural repertoire of larval zebrafish is reviewed and we demonstrate that larval zebrafish are capable of expecting a stimulus at a precise time point with minimal training. In conclusion, we propose that interval timing research using zebrafish and whole-brain calcium imaging at single-cell resolution will contribute to our understanding of how timing and time perception originate in the vertebrate brain from the level of single cells to circuits.
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Affiliation(s)
- Ruey-Kuang Cheng
- Institute of Molecular and Cellular Biology, , A*STAR, 61 Biopolis Drive, #08-13 Proteos, Singapore 138673, Singapore
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95
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Zorrilla EP, Koob GF. Amygdalostriatal projections in the neurocircuitry for motivation: a neuroanatomical thread through the career of Ann Kelley. Neurosci Biobehav Rev 2013; 37:1932-45. [PMID: 23220696 PMCID: PMC3838492 DOI: 10.1016/j.neubiorev.2012.11.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Accepted: 11/28/2012] [Indexed: 01/25/2023]
Abstract
In MacLean's triune brain, the amygdala putatively subserves motivated behavior by modulating the "reptilian" basal ganglia. Accordingly, Ann Kelley, with Domesick and Nauta, influentially showed that amygdalostriatal projections are much more extensive than were appreciated. They highlighted that amygdalar projections to the rostral ventromedial striatum converged with projections from the ventral tegmental area and cingulate cortex, forming a "limbic striatum". Caudal of the anterior commissure, the entire striatum receives afferents from deep basal nuclei of the amygdala. Orthologous topographic projections subsequently were observed in fish, amphibians, and reptiles. Subsequent functional studies linked acquired value to action via this neuroanatomical substrate. From Dr. Kelley's work evolved insights into components of the distributed, interconnected network that subserves motivated behavior, including the nucleus accumbens shell and core and the striatal-like extended amygdala macrostructure. These heuristic frameworks provide a neuroanatomical basis for adaptively translating motivation into behavior. The ancient amygdala-to-striatum pathways remain a current functional thread not only for stimulus-response valuation, but also for the psychopathological plasticity that underlies addiction-related memory, craving and relapse.
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Affiliation(s)
- Eric P Zorrilla
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.
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96
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Kittilsen S. Functional aspects of emotions in fish. Behav Processes 2013; 100:153-9. [PMID: 24056239 DOI: 10.1016/j.beproc.2013.09.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 09/10/2013] [Accepted: 09/11/2013] [Indexed: 10/26/2022]
Abstract
There is an ongoing scientific discussion on whether fish have emotions, and if so how they experience them? The discussion has incorporated important areas such as brain anatomy and function, physiological and behavioural responses, and the cognitive abilities that fish possess. Little attention has however, been directed towards what functional aspects emotions ought to have in fish. If fish have emotions - why? The elucidation of this question and an assessment of the scientific evidences of emotions in fish in an evolutionary and functional framework would represent a valuable contribution in the discussion on whether fish are emotional creatures. Here parts of the vast amount of literature from both biology and psychology relating to the scientific field of emotions, animal emotion, and the functional aspects that emotions fulfil in the lives of humans and animals are reviewed. Subsequently, by viewing fish behaviour, physiology and cognitive abilities in the light of this functional framework it is possible to infer what functions emotions may serve in fish. This approach may contribute to the vital running discussion on the subject of emotions in fish. In fact, if it can be substantiated that emotions are likely to serve a function in fish similar to that of other higher vertebrate species, the notion that fish do have emotions will be strengthened.
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97
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Guttridge TL, Brown C. Learning and memory in the Port Jackson shark, Heterodontus portusjacksoni. Anim Cogn 2013; 17:415-25. [DOI: 10.1007/s10071-013-0673-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 08/01/2013] [Accepted: 08/07/2013] [Indexed: 02/03/2023]
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98
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Harvey-Girard E, Giassi ACC, Ellis W, Maler L. Organization of the gymnotiform fish pallium in relation to learning and memory: IV. Expression of conserved transcription factors and implications for the evolution of dorsal telencephalon. J Comp Neurol 2013; 520:3395-413. [PMID: 22430363 DOI: 10.1002/cne.23107] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have cloned the apteronotid homologs of FoxP2, Otx1, and FoxO3. There was, in the case of all three genes, good similarity between the apteronotid and human amino acid sequences: FoxP2, 78%; Otx1, 54%; FoxO3, 71%. The functional domains of these genes were conserved to a far greater extent, on average: FoxP2, 89%; Otx1, 76%; FoxO3, 82%. This led us to hypothesize that the cellular functions of these genes might also be conserved. We used in situ hybridization to examine the distribution of the mRNA transcripts of these genes in the apteronotid telencephalon. We confined our analysis to the pallial regions previously associated with learning about social signals, whose circuitry has been closely examined in the other articles of this series. We found that AptFoxP2 and AptOtx1 transcripts were expressed predominantly in the dorsocentral division of the pallium (DC); the dorsolateral division of the pallium (DL) contained only weakly labeled neurons. In both cases, the distribution of labeled neurons was very heterogeneous, and unlabeled neurons could be found adjacent to strongly labeled ones. In contrast, we found that most neurons in DL strongly expressed AptFoxO3 mRNA, although there was only weak expression in a small number of cells within DC. We briefly discuss the relevance of our results regarding the functional roles of AptFoxP2/AptOtx1-expressing neurons in DC for communication vs. foraging behavior. We extensively discuss the implications of our results for possible homologies between DL and DC and medial and dorsal pallium of tetrapods, respectively.
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Affiliation(s)
- Erik Harvey-Girard
- Department of Cell and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.
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99
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Imaging of neural ensemble for the retrieval of a learned behavioral program. Neuron 2013; 78:881-94. [PMID: 23684786 DOI: 10.1016/j.neuron.2013.04.009] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2013] [Indexed: 11/22/2022]
Abstract
The encoding of long-term associative memories for learned behaviors is a fundamental brain function. Yet, how behavior is stably consolidated and retrieved in the vertebrate cortex is poorly understood. We trained zebrafish in aversive reinforcement learning and measured calcium signals across their entire brain during retrieval of the learned response. A discrete area of dorsal telencephalon that was inactive immediately after training became active the next day. Analysis of the identified area indicated that it was specific and essential for long-term memory retrieval and contained electrophysiological responses entrained to the learning stimulus. When the behavioral rule changed, a rapid spatial shift in the functional map across the telencephalon was observed. These results demonstrate that the retrieval of long-term memories for learned behaviors can be studied at the whole-brain scale in behaving zebrafish in vivo. Moreover, the findings indicate that consolidated memory traces can be rapidly modified during reinforcement learning.
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100
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Ng MC, Yang YL, Lu KT. Behavioral and synaptic circuit features in a zebrafish model of fragile X syndrome. PLoS One 2013; 8:e51456. [PMID: 23536755 PMCID: PMC3594205 DOI: 10.1371/journal.pone.0051456] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 11/01/2012] [Indexed: 01/08/2023] Open
Abstract
Fragile X syndrome (FXS) is the most frequent inherited form of human mental retardation. It is characterized by cognitive impairment and physical and behavioral problems and is caused by the silencing of fmr1 transcription and the absence of the fmr1 protein (FMRP). Recently, animal models of FXS have greatly facilitated the investigation of the molecular and cellular mechanisms of this loss-of-function disorder. The present study was aimed to further characterize the role of FMRP in behavior and synaptic function by using fmr1 knockout zebrafish. In adult zebrafish, we found that fmr1 knockout produces the anxiolytic-like responses of increased exploratory behavior in light/dark and open-field tests and avoidance learning impairment. Furthermore, electrophysiological recordings from telencephalic slice preparations of knockout fish displayed markedly reduced long-term potentiation and enhanced long-term depression compared to wild-type fish; however, basal glutamatergic transmission and presynaptic function at the lateral (Dl) and medial (Dm) division of the dorsal telencephalon synapse remained normal. Taken together, our study not only evaluates the mechanism of FRMP but also suggests that zebrafish have valuable potential as a complementary vertebrate model in studying the molecular pathogenesis of human fragile X syndrome.
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Affiliation(s)
- Ming-Chong Ng
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Yi-Ling Yang
- Department of Biochemical Science and Technology, National Chia-Yi University, Chia-Yi, Taiwan
- * E-mail: (YLY); (KTL)
| | - Kwok-Tung Lu
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
- * E-mail: (YLY); (KTL)
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