In this paper, we report (i) the in situ localization, and (ii) meal time related and starvation induced changes in preprogalanin mRNA expression in the goldfish brain. The specific brain nuclei that express galanin mRNA are the area ventralis telencephali pars ventralis, nucleus preopticus periventricularis, nucleus lateralis tuberis, and the nucleus recessus lateralis. No changes in preprandial preprogalanin mRNA expression were found in the brain regions studied. No changes in postprandial preprogalanin mRNA expression were found compared to the preprandial levels. However, in unfed fish, a significant increase in preprogalanin mRNA expression was found in the telencephalon (1 and 3 h) and hypothalamus (3 h) after the scheduled feeding time. The postprandial preprogalanin mRNA expression in the telencephalon and hypothalamus of fed fish at 1 and 3 h were significantly lower than the mRNA expression levels in the unfed fish at the same time. Preprogalanin mRNA expression levels remain unaltered during 7 days of starvation. The presence of preprogalanin mRNA in brain nuclei involved in the regulation of food intake and pituitary hormone secretion suggests important physiological roles for galanin in goldfish.
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