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Estrogen-Inducible, Sex-Specific Expression of Brain-Derived Neurotrophic Factor mRNA in a Forebrain Song Control Nucleus of the Juvenile Zebra Finch
Falk Dittrich, Yu Feng, Reinhold Metzdorf and Manfred Gahr
Proceedings of the National Academy of Sciences of the United States of America
Vol. 96, No. 14 (Jul. 16, 1999), pp. 8241-8246
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/48458
Page Count: 6
You can always find the topics here!Topics: Messenger RNA, Neurons, Estrogens, Female animals, Control systems, Juvenile stages, Juveniles, In situ hybridization, Behavioral neuroscience, Photomicrographs
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The expression of brain-derived neurotrophic factor (BDNF) mRNA is increased significantly within the high vocal center (HVc) of male but not female zebra finches from posthatching day 30-35 on. The population of HVc cells expressing BDNF mRNA included 35% of the neurons projecting to the nucleus robustus of the archistriatum (RA). In the RA and in RA-projecting neurons of the lateral portion of the magnocellular nucleus of the anterior neostriatum, BDNF mRNA was expressed at very low levels in both sexes. The BDNF-receptor trkB mRNA was expressed in the RA, in RA-projecting neurons of lateral portion of the magnocellular nucleus of the anterior neostriatum, and in the HVc, except in most of its RA-projecting neurons. Premature stimulation and an inhibitory effect on the normal increase of the BDNF mRNA expression in juvenile males occurred after treatments with 17β -estradiol and the aromatase inhibitor fadrozole, respectively. The up-regulation of the BDNF expression in the HVc could be a mechanism by which estrogen triggers the differentiation of cells within and connected to the HVc of male zebra finches.
Proceedings of the National Academy of Sciences of the United States of America © 1999 National Academy of Sciences