Changes in Prolactin Cell Activity in the Mudskipper, Periophthalmus chrysospilos, in Response to Hypotonic Environment(Endocrinology)

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Changes in plasma electrolyte concentrations and prolactin and growth hormone cell activities were examined in the euryhaline mudskipper, Periophthalmus chrysospilos, after exposure to hypotonic environment. When the fish were fully submerged in fresh water, they died within 2 days. No mortality was seen either in 15% seawater or in fresh water, however, when they had the liberty to be in or out of the water, although plasma sodium and calcium concentrations of the fish kept in a freshwater aquarium for 7 days were significantly lower than those in 100% or 15% seawater. There was no difference in plasma sodium levels between the fish in 100% seawater and those in 15% seawater. Prolactin- and growth hormone-secreting cells in the pituitary were identified by immunocytochemical staining using antisera raised against the salmon hormones. Significant increases in the nuclear and cell sizes of prolactin cells were observed in the fish in fresh water as compared with those in 100% or 15% seawater, whereas no change was seen in growth hormone cells. The activation of prolactin cells supports its important roles in freshwater osmoregulation.
社団法人日本動物学会の論文
1991-02-15