title: Cell-specific and developmental expression of phospholipase C-gamma and diacylglycerol in fetal lung.
abstract: Epidermal growth factor (EGF) receptor (EGFR) regulates development of cell-cell communication in fetal lung, but the signal transduction mechanisms involved are unknown. We hypothesized that, in late-gestation fetal rat lung, phospholipase C-gamma (PLC-gamma) expression and activation by EGF is cell specific and developmentally regulated. PLC-gamma immunolocalized to cuboidal epithelium and mesenchymal clusters underlying developing saccules. PLC-gamma protein increased from day 17 to day 19 and then decreased. In cultured fetal lung fibroblasts, EGF stimulated PLC-gamma phosphorylation 2.6-fold (day 17), 10.8-fold (day 19), and 4.2-fold (day 21). EGF stimulated (3)H-labeled diacylglycerol production in fibroblasts (beginning on day 18 in female and on day 19 in male rats), but not in type II cells at any time during gestation. EGFR blockade abrogated the observed stimulation of PLC-gamma phosphorylation by EGF. In conclusion, PLC-gamma expression and activation by EGF in fetal lung are cell specific, corresponding to the development of EGFR expression. EGF induces diacylglycerol production in a cell- and gestation-specific manner. PLC-gamma activation by EGFR in fetal lung fibroblasts may be involved in EGF control of lung development.
authors.affiliation: Division of Newborn Medicine, Tufts-New England Medical Center, Boston, Massachusetts 02111, USA. sramadurai@tufts-nemc.org
authors.forename: Sujatha M
authors.initials: SM
authors.lastname: Ramadurai
authors.forename: Wu-Yuan
authors.initials: WY
authors.lastname: Chen
authors.forename: George B
authors.initials: GB
authors.lastname: Yerozolimsky
authors.forename: Michelle
authors.initials: M
authors.lastname: Zagami
authors.forename: Christiane E L
authors.initials: CE
authors.lastname: Dammann
authors.forename: Heber C
authors.initials: HC
authors.lastname: Nielsen
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002450:Cell Communication / Q000502:physiology; D002478:Cells, Cultured; D004075:Diglycerides / Q000096:biosynthesis / Q000378:metabolism*; D004815:Epidermal Growth Factor / Q000494:pharmacology; D066246:ErbB Receptors / Q000378:metabolism; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000201:enzymology; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D007150:Immunohistochemistry; D008168:Lung / Q000196:embryology / Q000201:enzymology*; D008297:Male; D051966:Phospholipase C gamma; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D014316:Tritium; D010738:Type C Phospholipases / Q000235:genetics* / Q000378:metabolism
chemical_list: D004075:Diglycerides; D014316:Tritium; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D010738:Type C Phospholipases; D051966:Phospholipase C gamma