@article {788,
	title = {TGF-beta signaling activates steroid hormone receptor expression during neuronal remodeling in the Drosophila brain.},
	journal = {Cell},
	volume = {112},
	year = {2003},
	month = {2003 Feb 7},
	pages = {303-15},
	abstract = {<p>Metamorphosis of the Drosophila brain involves pruning of many larval-specific dendrites and axons followed by outgrowth of adult-specific processes. From a genetic mosaic screen, we recovered two independent mutations that block neuronal remodeling in the mushroom bodies (MBs). These phenotypically indistinguishable mutations affect Baboon function, a Drosophila TGF-beta/activin type I receptor, and dSmad2, its downstream transcriptional effector. We also show that Punt and Wit, two type II receptors, act redundantly in this process. In addition, knocking out dActivin around the mid-third instar stage interferes with remodeling. Binding of the insect steroid hormone ecdysone to distinct ecdysone receptor isoforms induces different metamorphic responses in various larval tissues. Interestingly, expression of the ecdysone receptor B1 isoform (EcR-B1) is reduced in activin pathway mutants, and restoring EcR-B1 expression significantly rescues remodeling defects. We conclude that the Drosophila Activin signaling pathway mediates neuronal remodeling in part by regulating EcR-B1 expression.</p>
},
	keywords = {Activin Receptors, Animals, Brain, Cell Differentiation, Cell Surface, DNA-Binding Proteins, Drosophila, Drosophila Proteins, Female, Genes, Larva, Lethal, Male, Missense, Mushroom Bodies, Mutation, Neural Pathways, Neuronal Plasticity, Neurons, Protein Isoforms, Proteins, Receptors, Signal Transduction, Smad2 Protein, Steroid, Trans-Activators, Transforming Growth Factor beta, Type I, Type II},
	issn = {0092-8674},
	author = {Zheng, Xiaoyan and Wang, Jian and Haerry, Theodor E and Wu, Ann Y-H and Martin, Josephine and O{\textquoteright}Connor, Michael B and Lee, Ching-Hsien J and Lee, Tzumin}
}
