Cell-specific and developmental expression of phospholipase C-γ 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-γ (PLC-γ) expression and activation by EGF is cell specific and developmentally regulated. PLC-γ immunolocalized to cuboidal epithelium and mesenchymal clusters underlying developing saccules. PLC-γ protein increased from day 17 to day 19 and then decreased. In cultured fetal lung fibroblasts, EGF stimulated PLC-γ phosphorylation 2.6-fold ( day 17), 10.8-fold ( day 19), and 4.2-fold ( day 21). EGF stimulated 3H-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-γ phosphorylation by EGF. In conclusion, PLC-γ 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-γ activation by EGFR in fetal lung fibroblasts may be involved in EGF control of lung development.