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A correction to this article has been published: J. Cell Biol. 143 (7) 2093
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The Journal of Cell Biology, Vol 122, 443-450, Copyright © 1993 by The Rockefeller University Press


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Neurotrophin-3 induced by tri-iodothyronine in cerebellar granule cells promotes Purkinje cell differentiation [published erratum appears in J Cell Biol 1998 Dec 28;143(7):following 2090]

D Lindholm, E Castren, P Tsoulfas, R Kolbeck, P Berzaghi M da, A Leingartner, CP Heisenberg, L Tessarollo, LF Parada and L] Tesarollo L$[corrected to Tessarollo
Department of Neurochemistry, Max Planck Institute for Psychiatry, Martinsried Munich, Federal Republic of Germany.

Thyroid hormones play an important role in brain development, but the mechanism(s) by which triiodothyronine (T3) mediates neuronal differentiation is poorly understood. Here we demonstrate that T3 regulates the neurotrophic factor, neurotrophin-3 (NT-3), in developing rat cerebellar granule cells both in cell culture and in vivo. In situ hybridization experiments showed that developing Purkinje cells do not express NT-3 mRNA but do express trkC, the putative neuronal receptor for NT-3. Addition of recombinant NT-3 to cerebellar cultures from embryonic rat brain induces hypertrophy and neurite sprouting of Purkinje cells, and upregulates the mRNA encoding the calcium-binding protein, calbindin-28 kD. The present study demonstrates a novel interaction between cerebellar granule neurons and developing Purkinje cells in which NT-3 induced by T3 in the granule cells promotes Purkinje cell differentiation.
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