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Characterization of neuronal subsets surrounded by perineuronal nets in the rhesus auditory brainstem
Author(s) -
Hilbig Heidegard,
Nowack Sandra,
Boeckler Katrin,
Bidmon HansJürgen,
Zilles Karl
Publication year - 2007
Publication title -
journal of anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 118
eISSN - 1469-7580
pISSN - 0021-8782
DOI - 10.1111/j.1469-7580.2007.00713.x
Subject(s) - inferior colliculus , nucleus , superior olivary complex , neuroscience , biology , trapezoid body , gabab receptor , brainstem , anatomy , cochlear nucleus , lateral lemniscus , hypoglossal nucleus , gabaa receptor , perineuronal net , central nervous system , receptor , genetics
The distribution of perineuronal nets and the potassium channel subunit Kv3.1b was studied in the subdivisions of the cochlear nucleus, the medial nucleus of the trapezoid body, the medial and lateral superior olivary nuclei, the lateral lemniscal nucleus and the inferior colliculus of the rhesus monkey. Additional sections were used for receptor autoradiography to visualize the patterns of GABA A and GABA B receptor distribution. The Kv3.1b protein and perineuronal nets [visualized as Wisteria floribunda agglutinin (WFA) binding] were revealed, showing corresponding region‐specific patterns of distribution. There was a gradient of labelled perineuronal nets which corresponded to that seen for the intensity of Kv3.1b expression. In the cochlear nucleus intensely and faintly stained perineuronal nets were intermingled, whereas in the medial nucleus of the trapezoid body the pattern changed to intensely stained perineuronal nets in the medial part and weakly labelled nets in its lateral part. In the inferior colliculus, intensely labelled perineuronal nets were arranged in clusters and faintly labelled nets were arranged in sheets. Using receptor autoradiography, GABA B receptor expression in the anterior ventral cochlear nucleus was revealed. The medial part of the medial nucleus of the trapezoid body showed a high number of GABA A binding sites whereas the lateral part exhibited more binding sites for GABA B . In the inferior colliculus, we found moderate GABA B receptor expression. In conclusion, intensely WFA‐labelled structures are those known to be functionally involved in high‐frequency processing.