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  • 1
    Electronic Resource
    Electronic Resource
    Stimulus-Evoked Increase of Glutamate in the Mediorostral Neostriatum/Hyperstriatum Ventrale of Domestic Chick After Auditory Filial Imprinting: An In Vivo Microdialysis Study (1996)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 66 (1996), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Imprinting in chicks is a form of juvenile learning that has been used to study the basic cellular mechanisms of learning and memory. The forebrain area mediorostral neostriatum/hyperstriatum ventrale (MNH) is a center for acoustic imprinting. Electrophysiological and pharmacological behavioral studies in the MNH have demonstrated that the glutamatergic system and the associated receptors are critically involved in auditory filial imprinting. Accordingly, we investigated the hypothesis that stimulus-evoked glutamate release may be altered after this learning process. Using an in vivo microdialysis technique, we observed a significantly higher increase of extracellular glutamate level in tone-imprinted chicks during exposure to the previously imprinted tone than in socially imprinted control chicks. In a further series of experiments, where we exposed animals from both experimental groups to handling distress, glutamate levels in MNH showed only a slight increase, whereas we observed a pronounced increase of extracellular glutamate in the lobus parolfactorius (LPO), the avian analogue of the basal ganglia. No difference of distress-evoked glutamate release was found in MNH and LPO between tone-imprinted and socially imprinted chicks. The tone-evoked enhanced glutamate response in tone-imprinted chicks suggests that during auditory imprinting glutamatergic synapses develop the potential to increase transmitter release in response to the imprinting stimulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1996.66031167.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Social Experience on Dopamine-Stimulated Adenylyl Cyclase Activity and G Protein Composition in Chick Forebrain (1999)
    Oxford UK : Blackwell Science Ltd
    Journal of neurochemistry 73 (1999), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract : The stimulation of adenylyl cyclase (AC) by dopamine was investigated in membrane fractions of the forebrain areas mediorostral neostriatum/hyperstriatum ventrale (MNH) and lobus parolfactorius (LPO) of 8-day-old domestic chicks that had been raised under different social conditions : group A, socially isolated ; group B, imprinted on an acoustic stimulus ; group C, trained but nonimprinted ; and group D, reared in small groups. Only in the brain of the socially experienced groups could cyclic AMP (cAMP) synthesis be stimulated by dopamine, but not in the socially isolated animals (group A). Ligand binding studies of dopamine D1- and D2-type receptors in membrane fractions did not reveal differences between socially experienced and isolated animals. Forskolin stimulation of total AC in MNH and LPO membrane fractions revealed a significantly enhanced AC stimulation in the socially reared but not in the imprinted group compared with isolated controls. Stimulation of AC by the G protein activator guanylylimidodiphosphate was significantly increased in the MNH and the LPO of socially reared chicks compared with isolated control animals. These results suggest that early postnatal social experience modulates the rate of cAMP synthesis and that these lasting changes are not due to changes of dopamine receptors but are related to increased AC activities and to increased sensitivity of Gs protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1999.0731293.x
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  • 3
    Electronic Resource
    Electronic Resource
    Filial imprinting in domestic chicks is associated with spine pruning in the associative area, dorsocaudal neostriatum (1999)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 11 (1999), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Juvenile emotionally modulated learning events are fundamental for the normal development of socio-emotional competence and intellectual capabilities. Filial imprinting in the domestic chick provides a suitable model to investigate the neural mechanisms underlying such juvenile learning events. The forebrain area dorsocaudal neostriatum (Ndc), a multimodal integration area and presumed equivalent to mammalian parietotemporal association cortices, has been shown to be critically involved in this learning process. We investigated whether filial imprinting is associated with changes of synaptic connectivity in the Ndc. Quantitative measurements of spine densities of a large neuron type in the Ndc revealed a massive pruning of spine synapses after filial imprinting. Compared with 7-day-old naive control chicks, imprinted chicks displayed significantly lower spine frequencies on all dendritic segments. Since the average length of the dendritic segments did not change during imprinting, these results can be interpreted as a reduction of the absolute number of spine synapses on this neuron type. In a control region, the primary sensory forebrain area ectostriatum, spine density and dendritic length remained unchanged. These results indicate that synaptic pruning may represent a mechanism of selective synaptic reorganization in higher associative forebrain areas as a fundamental feature of juvenile learning events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-9568.1999.00713.x
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  • 4
    Electronic Resource
    Electronic Resource
    Role of the Dorso—Caudal Neostriatum in Filial Imprinting of the Domestic Chick: a Pharmacological and Autoradiographical Approach Focused on the Involvement of NMDA-Receptors (1997)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 9 (1997), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Newly hatched domestic chicks were either acoustically imprinted on 400 Hz tone pulses or visually imprinted on a rotating red light. Compared to naive control animals, both groups of imprinted chicks expressed significantly enhanced stimulus evoked 2-fluoro-2-deoxyglucose (2-FDG) uptake in circumscribed areas of the dorso-caudal neostriatum (Ndc). This enhanced excitability after imprinting seems not to be related to changes of NMDA-receptor densities as measured by quantitative receptor autoradiography. However, pharmacological blockade of NMDA-receptors in the dorso-caudal neostriatum leads to a marked suppression of stimulus-evoked 2-FDG uptake in the dorso-caudal neostriatum and also in the interconnected imprinting relevant forebrain area, medio-rostral neostriatum/hyperstriatum ventrale (MNH). Furthermore, chicks which received bilateral Ndc injections of the competitive NMDA antagonist DL-2-amino-5-phosphono valeric acid (APV) during the imprinting experiments showed a dose-dependent decrease of imprinting success compared to vehicle-injected controls. These results indicate that the dorso-caudal neostriatum may represent a polysensory associative brain region in which visual and acoustic features of imprinting objects may be integrated. The activation in this area evoked by the imprinting stimulus during and after imprinting is critically dependent on NMDA-receptor activation, which appears to be required for this learning process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.1997.tb01481.x
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  • 5
    Electronic Resource
    Electronic Resource
    Localization of the neural calcium-binding protein VILIP (visinin-like protein) in neurons of the chick visual system and cerebellum (1996)
    Springer
    Cell & tissue research 283 (1996), S. 413-424 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Calcium-binding proteins ; EF-hand proteins ; Visinin-like protein ; Cerebellum ; Visual system ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The visinin-like protein (VILIP) is a member of a recently discovered family of calcium sensors specifically expressed in neurons. Family members contain four potential calcium-binding domains commonly referred to as ”EF-hand motifs”. VILIP interacts in a calcium-dependent manner with the actin-based neuronal cytoskeleton and modulates the phosphorylation of G-protein-coupled receptors, i.e., rhodopsin, in vitro. Here, we have used antisera against VILIP to study its distribution in the chick brain. Immunostaining of subsets of neurons is observed throughout the brain. Generally, the distribution of VILIP coincides well with the distribution of VILIP transcripts as detected previously by in situ hybridization. The most intense expression is detected in the visual system and the cerebellum. In the visual system, neurons of the nuclei of the ascending tecto-fugal pathway are stained, as are the pretectal, isthmic, and oculomotor nuclei. VILIP immunoreactivity is found in cell bodies, dendrites, and synaptic structures. Thus, VILIP appears to be an excellent marker for the characterization of neurons of the visual pathway. In the cerebellum, VILIP immunoreactivity is detected in deep cerebellar nuclei and in a subset of granule cells, Golgi type II cells, basket cells, and stellate cells, whereas it is completely absent from Purkinje cells. Intense punctate staining in the molecular layer suggests that VILIP is transported from deep cerebellar nuclei and from granule cells to the glutamatergic climbing-fiber and parallel-fiber synapses, respectively, both of which terminate on Purkinje-cell dendrites. The localization of VILIP in these presynaptic terminals has been confirmed at the electron-microscopic level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050552
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  • 6
    Electronic Resource
    Electronic Resource
    System-specific distribution of zinc in the chick brain (1989)
    Springer
    Cell & tissue research 258 (1989), S. 247-257 
    Details
    ISSN: 1432-0878
    Keywords: Zinc ; Timm method ; Ultrastructure ; Synapses ; Avian brain ; Domestic fowl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The brain of young domestic chicks was investigated using a Timm sulfide silver method. Serial Vibratome sections were analyzed under the light microscope, and the localization of zinc-positive structures in selected areas was determined at the ultrastructural level. Both strong and differential staining was visible in the avian telencephalon whereas most subtelencephalic structures showed a pale reaction. The highest staining intensity was found in the nonprimary sensory regions of the telencephalon such as the hyperstriatum dorsale, hyperstriatum ventrale, hippocampus, palaeostriatum augmentatum, lobus parolfactorius and caudal parts of neostriatum. There was an overall gradient of staining intensity in neostriatal areas from rostral to caudal with the heaviest zinc deposits in the caudal neostriatum. Primary sensory projection areas, such as the ectostriatum (visual), hyperstriatum intercalatum superius (visual), nucleus basalis (beak representation), the input layer L2 of the auditory field L and the somatosensory area rostral to field L were selectively left unstained. Fiber tracts throughout the brain were free of zinc deposits except for glial cells. In electron micrographs of stained regions, silver grains were localized in some presynaptic boutons of asymmetric synapses (Gray type I), within the cytoplasm of neuronal somata and sporadically in the nucleus. The possible involvement of zinc in synaptic transmission and other processes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239445
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  • 7
    Electronic Resource
    Electronic Resource
    Cellular localization of the Ca2+-binding protein parvalbumin in the developing avian cerebellum (1986)
    Springer
    Cell & tissue research 243 (1986), S. 69-78 
    Details
    ISSN: 1432-0878
    Keywords: Ca-binding protein ; Parvalbumin ; Cerebellum ; Development ; Birds ; Zebra finch, Poephila guttata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The appearance and distribution of the calciumbinding protein parvalbumin was investigated immunocytochemically at different postnatal developmental stages of the zebra finch cerebellum. Purkinje, basket and stellate, but not granule neurons or glial cells were labeled by an antiserum against chicken parvalbumin. At all developmental stages investigated immunostained Purkinje cells were found in clusters separated by spaces containing unstained large cells, probably Purkinje and Golgi type-II cells, and unstained smaller cells resembling granule neurons. Perisomatic processes, dendrites and spines of Purkinje cells were heavily immunoreactive. Axons of Purkinje cells were observed to be parvalbumin-positive throughout their entire length until developmental stage D 24, i.e., 10 days after hatching. Their immunoreactivity gradually decreased up to adulthood, when only their proximal portions, in addition to a few punctate structures in the internal granular layer and in the deep cerebellar nuclei presumably representing the synaptic terminals, remained immunoreactive. This decrease in immunoreactivity might be related to progressive maturation and/or degree of myelination. The developmental expression of parvalbumin immunoreactivity and its ultrastructural localization in spines, postsynaptic densities and on microtubular elements leads to several suggestions concerning the possible function of parvalbumin in neurons. In outgrowing dendrites and axons the protein might be involved in the regulation of the synthesis of membrane components, their intracellular transport and fusion of new membrane components into the plasmalemma, events that are Ca- and/or Mg-dependent. In spines and postsynaptic densities parvalbumin might be involved in the development and regulation of synaptic activities in Ca-spiking elements such as the inhibitory Purkinje cells, and possibly also in stellate and basket cells. Furthermore, in developing and adult neurons parvalbumin might be involved in the Ca-/Mg-regulation of a variety of enzymatic activities and hence influence the alteration of the intracellular metabolic potential in response to extracellular signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221854
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution of parvalbumin, cytochrome oxidase activity and 14C-2-deoxyglucose uptake in the brain of the zebra finch (1985)
    Springer
    Cell & tissue research 240 (1985), S. 117-127 
    Details
    ISSN: 1432-0878
    Keywords: Visual system, avian ; Parvalbumin ; Cytochrome oxidase ; 2-Deoxyglucose ; Zebra finch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The visual system of adult zebra finches was investigated 1) immunocytochemically for the distribution of the Ca2+-binding protein parvalbumin, 2) for the activity of the respiratory enzyme cytochrome oxidase, and 3) for the uptake of 2-deoxyglucose. In the visual system, only nuclei of the tecto-fugal pathway and related nuclei were labeled by the parvalbumin antiserum (ectostriatum, nucleus rotundus, tectum opticum, nucleus postero-ventralis, nucleus praetectalis, nucleus subpraetectalis, nucleus isthmipars parvocellularis and-magnocellularis, nucleus isthmoopticus). Additionally, parvalbumin-positive nuclei such as area entorhinalis, area “a” in the hyperstriatum accessorium, nucleus septalis medialis and nucleus habenularis are described. With few exceptions there was a striking correlation of parvalbumin-positive and cytochrome oxidase-positive nuclei of the visual system. Most of the areas with high levels of parvalbumin and cytochrome oxidase were labeled with 2-deoxyglucose as well. Nucleus posteroventralis showed labeling below background intensity. 2-Deoxyglucose uptake primarily reflects energy demands of actual electrical activity, i.e., of the Na+-K+ pump, while cytochrome oxidase supposedly indicates the long-term energy demands of various metabolic pathways. Consequently, high cytochrome oxidase activity together with large 2-deoxyglucose uptake in the tecto-fugal pathway might be due to the high spontaneous and evoked electrical activity. Parvalbumin concentrations in the same areas (and in auditory areas, see Braun et al. 1985I) suggest as one possibility that special Ca2+ mechanisms are present in neuronal systems that can reach high levels of electrical activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217564
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  • 9
    Electronic Resource
    Electronic Resource
    Distribution of parvalbumin, cytochrome oxidase activity and 14C-2-deoxyglucose uptake in the brain of the zebra finch (1985)
    Springer
    Cell & tissue research 240 (1985), S. 101-115 
    Details
    ISSN: 1432-0878
    Keywords: Auditory system ; Vocal motor system ; Parvalbumin ; Cytochrome oxidase ; 2-Deoxyglucose ; Calcium ; Plasticity ; CNS ; Song birds ; Zebra finch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The auditory and vocal motor systems of adult zebra finches were investigated 1) immunocytochemically for the distribution of the Ca2+-binding protein parvalbumin, 2) for the activity of the respiratory enzyme cytochrome oxidase, and 3) for the uptake of 2-deoxyglucose. All auditory nuclei (field L, nucleus ovoidalis, ansa lenticularis, nucleus spiriformis lateralis, nucleus mesencephalicus lateralis-pars dorsalis, nucleus tegmenti pedunculo-pontinus) and vocal motor nuclei (nucleus magnocellularis of the anterior neostriatum, area X, nucleus interfacialis, hyperstriatum ventrale-pars caudalis, nucleus robustus archistriatalis, nucleus intercollicularis) showed high levels of parvalbumin and cytochrome oxidase. Auditory nuclei in addition showed high spontaneous 2-deoxyglucose uptake, while the vocal motor nuclei either remained at background intensity (nucleus magnocellularis of the anterior neostriatum, hyperstriatum ventrale-pars caudalis, nucleus interfacialis and nucleus intercollicularis) or even below background levels (area X, nucleus robustus archistriatalis). Cytochrome oxidase activity supposedly reflects the energy demand of various aspects of metabolism, while 2-deoxyglucose uptake is primarily related to the demands of electrical activity and the Na+-K+ pump. Consequently, it is argued (i) that the congruently high cytochrome oxidase activity and 2-deoxyglucose uptake in the auditory system are due to the high spontaneous electrical activity of neurons, and (ii) that high cytochrome oxidase activity in vocal motor nuclei is related to other than electrical events since 2-deoxyglucose uptake is low. There is evidence of Ca2 + potentials in some parvalbumin-positive neuron types. Ca2+ potentials must lead to Ca2+ flooding of the cytoplasm which could be buffered by parvalbumin thus preventing interference with Ca2+ dependent metabolic reactions or shuttling the ion to sites of such reactions. The unique morphological plasticity reported from the parvalbumin-positive vocal motor nuclei may put a strain on microtubular transport which is Ca2+ dependent. This leads to the idea that parvalbumin reflects local buffering and redistribution mechanisms for Ca2+, and that cytochrome oxidase indicates the underlying energy demand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217563
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