Effects of atropine on the melanophores and light-reflecting chromatophores of some teleost fishes |
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| Institution: | 1. Department of Mechanical and Aerospace Engineering, Tandon School of Engineering, New York University, New York, USA;2. Department of Biomedical Engineering and Department of Civil and Urban Engineering, Tandon School of Engineering, New York University, New York, USA;1. Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA;2. Marmara University, School of Medicine, Istanbul, Turkey;3. Center for Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA;1. Psychiatry Department (EOXI de Santiago), Gallegan Health System (Servicio Gallego de Salud), Santiago de Compostela, Spain;2. Psychiatry Department (EOXI de Lugo), Gallegan Health System (Servicio Gallego de Salud), Lugo, Spain;3. Department of Psychosis Studies, Institute of Psychiatry, King''s College London, London, UK;4. Servicio de Psiquiatría, EOXI Santiago, Servicio Gallego de Salud, Spain;5. Department of Psychiatry, University of Granada, Granada, Spain;6. Institute of Neurosciences, Center for Biomedical Research, University of Granada, Granada, Spain;7. Department of Preventive Medicine and Public Health, University of Granada, Granada, Spain;8. Department of Biostatistics, The University of Kansas Medical Center, Kansas City, KS, USA;9. Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA;1. Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA;2. Johns Hopkins Center for a Livable Future, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA;3. Department of Health Policy and Management, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA |
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| Abstract: | 1. The mechanism of the action of atropine, which is known to accelerate the dispersion response of fish melanophores, was examined by use of various receptor antagonists.2. The effects of atropine were found to be independent of adenosine receptors, beta-adrenoceptors and MSH receptors on the melanophore membrane.3. Analogs of atropine, such as scopolamine, also had a potent pigment-dispersing effect on melanophores, whereas the quaternary ammonium derivatives, which are positively charged molecules, had only a small effect.4. These results suggest that the possible site of atropine action is within the chromatophores themselves.5. In addition to the melanosome-dispersing effect, atropine caused a shift in the spectral peak of reflected light toward shorter wavelengths and the dispersion of leucosomes in the motile iridophores of the blue damselfish and in the leucophores of the medaka, respectively. |
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