Autoradiographic localization of binding sites for vasotocin in the brain and pituitary of the sea bass (Dicentrarchus labrax) |
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Authors: | L Moons M Cambr T F C Batten and F Vandesande |
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Institution: | 1 Laboratory of Neuroendocrinology and Immunological Biotechnology, Catholic University of Leuven, Leuven, Belgium 2 Department of Cardiovascular Studies, University of Leeds, Leeds, U.K. |
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Abstract: | Specific binding sites for vasotocin (VT) were detected in brain and pituitary of a teleost fish, the sea bass, after in vitro incubation of tissue sections with 3H]arginine-vasopressin (AVP) and light microscopic autoradiography. Conditions for the binding assay were optimized and as a result the binding was saturable and specific. In the brain 3H]AVP binding was found to occur in the pars lateralis and the pars ventralis of the ventral telencephalon, in the pars centralis of the dorsal telencephalon, in the hypothalamic region (especially in the nucleus preopticus, in the tuberal hypothalamus and around the posterior recess), in the tectum opticum and in the noncellular layer of the corpus cerebelli. In the pituitary a high density of 3H]AVP binding was observed in the areas of the pars distalis (PD) occupied by ACTH-, TSH- and GH-cells and also in the pars intermedia (PI). The present study presents the first anatomical evidence for the presence of VT specific binding sites in teleost brain and pituitary. |
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Keywords: | Teleost Vasopressin Vasotocin Pituitary Brain Binding site Autoradiography |
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