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  • Dopamine  (2)
  • Springer  (2)
  • Institute of Physics
  • PANGAEA
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  • Springer  (2)
  • Institute of Physics
  • PANGAEA
  • Elsevier  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of retinal dopamine depletion on the growth of the fish eye (1999)
    Springer
    Journal of comparative physiology 184 (1999), S. 403-412 
    Details
    ISSN: 1432-1351
    Keywords: Key words Emmetropization ; Myopia ; Dopamine ; 6-Hydroxy-dopamine ; Crystalline lens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We investigated the suitability of fishes as animal models to study the involvement of the retinal dopaminergic system in the visually guided control of eye growth (emmetropization). Advantages of such a model system are (i) that all dopaminergic cells in the retina can be destroyed without apparent damage to other neurons, (ii) simple optical design and short depth of field of the eye, and (iii) continuous growth throughout life. Depleting the retina of dopamine in Aequidens pulcher (Cichlidae) had no apparent effect on refractive state, since size and focal length of the eye were reduced by the same amount. Furthermore, imposed defocus was compensated at a normal rate in spite of the absence of retinal dopamine. In A. pulcher, the dopaminergic system of the retina thus appears not to have an essential role in emmetropization. Our results furthermore suggest that in eyes of more complicated optical design, manipulation of the retinal dopaminergic system may lead to unrelated effects indistinguishable from direct interference with emmetropization. A major disadvantage of the fish model was that refractive state of the eye could not be measured accurately in vivo with standard methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050339
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  • 2
    Electronic Resource
    Electronic Resource
    Dopaminergic interplexiform cells contact photoreceptor terminals in catfish retina (1990)
    Springer
    Cell & tissue research 261 (1990), S. 359-365 
    Details
    ISSN: 1432-0878
    Keywords: Dopamine ; Interplexiform cell ; Cones ; Rods ; Synapses ; Outer plexiform layer ; Catfish, Kryptopterus bicirrhis (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dopaminergic interplexiform cells in retinae of glass catfish were investigated using an antiserum against tyrosine hydroxylase and peroxidase-anti-peroxidase (PAP) visualization. In whole-mount preparations, we observed a homogeneous distribution of cell bodies throughout the retina without any indication of regional specializations. At the ultrastructural level, we studied the morphology of labelled telodendria within the outer plexiform layer. Apart from contacts with horizontal cells and bipolar cell dendrites, we report for the first time direct contacts with cone pepdicles and rod spherules. Quantitative evaluation of short series of sections showed that all cone pedicles, and a major part of the rod terminals, were approached in this way. The dopaminergic pathway terminating on photoreceptors is discussed in the context of pharmacological effects of this transmitter in the distal retina during light adaptation, i.e., cone contraction, spinule formation and horizontal cell coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318678
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