Mitochondria-rich cells in Antarctic fish gills |
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Authors: | M A Masini M Sturla P Prato B Uva |
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Institution: | (1) Dipartimento di Biologia Sperimentale, Ambientale ed Applicata, Università di Genova, Viale Benedetto XV, 5, I-16132 Genoa, Italy e-mail: masini@unige.it Tel.: +39-10-3538049, Fax: +39-10-3538047, IT |
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Abstract: | We used transmission and scanning electron microscopy and an antibody to the inner mitochondrial membrane to study the presence
and localisation of mitochondria-rich cells in the gills of two Antarctic fishes, Chionodraco hamatus (Channichthyidae) and Trematomus bernacchii (Nototheniidae). The general morphology of the gills in the two species was slightly different: in T. bernacchii the filament and secondary lamellae were short and thicker, and mitochondria-rich cells were less numerous than in C. hamatus. In the two species the mitochondria-rich cells, distributed in the secondary and primary epithelium, were of the same morphological
type, similar to the α-chloride cells of temperate seawater teleosts. The study was carried out to compare the mitochondria-rich
cells of Antarctic fishes to the chloride cells of temperate marine teleosts. Immunolocalisation, using a specific antibody
to the α-subunit of Na+/K+-ATPase, was observed in numerous epithelial cells in the interlamellar epithelium and on the secondary lamellae, suggesting
an active sodium chloride secretion.
Accepted: 16 October 1999 |
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