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Biphasic effects of neonatal allopregnanolone on striatal dopamine metabolism
Katsumasa Muneoka1, Makiko Kuwagata, Yukihiko Shirayama
1Department of Anatomy I, Showa University School of Medicine, Tokyo, Japan. kmuneoka@med.showa-u.ac.jp
Abstract:
Neurosteroids are known to modulate the development of the mesocorticolimbic system. We examined the effects of low (1 mg/kg) and high (10 mg/kg) doses of allopregnanolone on monoamine metabolism during the neonatal period (postnatal days 3-7) in rats. At 10 weeks of age, increases in homovanillic acid/dopamine (DA) ratios were found in the striatum in both allopregnanolone-treated groups compared with control rats. However, striatal DA levels decreased only in the low-allopregnanolone group and striatal homovanillic acid levels increased only in the high-allopregnanolone group. Allopregnanolone did not significantly affect cortical DA metabolism, or cortical or striatal serotonin metabolism. Data indicate that neonatal allopregnanolone treatment has a biphasic effect on striatal DA metabolism.
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