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25 July 2008 Prolactin Inhibits Osteoclastic Activity in the Goldfish Scale: A Novel Direct Action of Prolactin in Teleosts
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Abstract

In teleosts, prolactin is involved in calcium regulation, but its role in scale/bone metabolism is unclear. Using the in-vitro system with goldfish scales developed recently, we explored the effects of teleost prolactin, growth hormone, and somatolactin on osteoclasts and osteoblasts. Addition of prolactin at concentrations of 0.01–100 ng/ml reduced osteoclastic activity, partly via osteoclast apoptosis, after 6–18 h incubation. Conversely, growth hormone and somatolactin at a concentration of 100 ng/ml increased osteoclastic activity after 18 h incubation, indicating the specificity of the inhibitory effect of prolactin on osteoclastic activity. On the other hand, these three hormones promoted osteoblastic activity at concentrations of 10–100 ng/ml. The results from this study are the first demonstration of direct effects of prolactin on scale/bone metabolism and osteoclastic activity in a teleost.

Hideya Takahashi, Nobuo Suzuki, Chiyo Takagi, Mika Ikegame, Toshio Yamamoto, Akiyoshi Takahashi, Shunsuke Moriyama, Atsuhiko Hattori, and Tatsuya Sakamoto "Prolactin Inhibits Osteoclastic Activity in the Goldfish Scale: A Novel Direct Action of Prolactin in Teleosts," Zoological Science 25(7), 739-745, (25 July 2008). https://doi.org/10.2108/zsj.25.739
Received: 4 April 2008; Accepted: 1 April 2008; Published: 25 July 2008
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