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Synaptophysin immunoreactivity in the cat cochlear nuclei
P. Gil-Loyzaga1, M.V. Bartolomé1 and A. Ibáñez2
1Department of Surgery II (ORL), Faculty of Medicine and
Center of Cell Culture (CAI-UCM) and 2Department of Cell Biology, Faculty
of Medicine, Complutense University of Madrid, Madrid, Spain
Offprint requests to: Prof.
P. Gil-Loyzaga MD., PhD., Apartado de Correos 60075, 28080 Madrid, Spain
Summary. The presence of synaptophysin,
a presynaptic Ca2+ binding glycoprotein, has been analyzed in the cochlear
nucleus complex of the adult cat using an anti-synaptophysin monoclonal
antibody. Synaptophysin immunoreactivity was differently distributed between
regions of cochlear nuclei. Terminal boutons contacting directly with neurons
(cell bodies and dendrites) or in the neuropil of ventral and dorsal cochlear
nuclei appeared immunostained. In the ventral cochlear nucleus, synaptophysin-labelled
boutons were clearly defined in contact with spherical, globular, multipolar,
octopus and cochlear-nerve root neurons. However, the dorsal cochlear nucleus
showed a dense immunostained network of synaptophysin-labelled puncta, inside
which some neuron cell bodies were observed. The present findings show a
differential distribution of synapto-physin-immunostained boutons between
the ventral and the dorsal cochlear nuclei of the cat. The present description
of the different synaptophysin-labelled terminal boutons in the cochlear
nuclei complex and their pattern of distribution, will be useful for further
studies on development, degeneration or regeneration of the peripheral auditory
pathway. Histol Histopathol 13, 415-424 (1998)
Key words: Cochlear nuclei,
Synaptophysin, Auditory pathway, Cat
DOI: 10.14670/HH-13.415
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