PMID- 15469970 OWN - NLM STAT- MEDLINE DCOM- 20041223 LR - 20191210 IS - 0950-1991 (Print) IS - 0950-1991 (Linking) VI - 131 IP - 21 DP - 2004 Nov TI - FGF and PI3 kinase signaling pathways antagonistically modulate sex muscle differentiation in C. elegans. PG - 5381-92 AB - Myogenesis in vertebrate myocytes is promoted by activation of the phosphatidyl-inositol 3'-kinase (PI3 kinase) pathway and inhibited by fibroblast growth factor (FGF) signaling. We show that hyperactivation of the Caenorhabditis elegans FGF receptor, EGL-15, similarly inhibits the differentiation of the hermaphrodite sex muscles. Activation of the PI3 kinase signaling pathway can partially suppress this differentiation defect, mimicking the antagonistic relationship between these two pathways known to influence vertebrate myogenesis. When ectopically expressed in body wall muscle precursor cells, hyperactivated EGL-15 can also interfere with the proper development of the body wall musculature. Hyperactivation of EGL-15 has also revealed additional effects on a number of fundamental processes within the postembryonic muscle lineage, such as cell division polarity. These studies provide important in vivo insights into the contribution of FGF signaling events to myogenesis. FAU - Sasson, Isaac E AU - Sasson IE AD - Yale University School of Medicine, Department of Genetics, I-354 SHM, PO Box 208005, New Haven, CT 06520-8005, USA. FAU - Stern, Michael J AU - Stern MJ LA - eng GR - GM07205/GM/NIGMS NIH HHS/United States GR - GM50504/GM/NIGMS NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. DEP - 20041006 PL - England TA - Development JT - Development (Cambridge, England) JID - 8701744 RN - 0 (Caenorhabditis elegans Proteins) RN - 0 (EGL-15 protein, C elegans) RN - 0 (Phosphoinositide-3 Kinase Inhibitors) RN - 0 (Protein Isoforms) RN - 0 (Receptors, Fibroblast Growth Factor) RN - 62031-54-3 (Fibroblast Growth Factors) SB - IM MH - Animals MH - Caenorhabditis elegans/cytology/*growth & development/*metabolism MH - Caenorhabditis elegans Proteins/antagonists & inhibitors/genetics/*metabolism MH - Cell Differentiation MH - Cell Lineage MH - Fibroblast Growth Factors/antagonists & inhibitors/metabolism MH - Gene Expression Regulation, Developmental MH - Muscle Development MH - Muscles/cytology/enzymology/*metabolism MH - Myoblasts/cytology/metabolism MH - Phenotype MH - Phosphatidylinositol 3-Kinases/*metabolism MH - Phosphoinositide-3 Kinase Inhibitors MH - Protein Isoforms/genetics/metabolism MH - Receptors, Fibroblast Growth Factor/antagonists & inhibitors/genetics/*metabolism MH - *Sex Differentiation MH - *Signal Transduction EDAT- 2004/10/08 09:00 MHDA- 2004/12/24 09:00 CRDT- 2004/10/08 09:00 PHST- 2004/10/08 09:00 [pubmed] PHST- 2004/12/24 09:00 [medline] PHST- 2004/10/08 09:00 [entrez] AID - dev.01423 [pii] AID - 10.1242/dev.01423 [doi] PST - ppublish SO - Development. 2004 Nov;131(21):5381-92. doi: 10.1242/dev.01423. Epub 2004 Oct 6.