Rat neuronal leucine-rich repeat protein-3: Cloning and regulation of the gene expression

Rat neuronal leucine-rich repeat protein-3 (rNLRR-3) gene was isolated and cloned from fibrosarcoma cells overexpressing c-Ha-ras. Stable expression o f constitutively active forms of Ras (H-Ras(V12) or v-H-Ras) led to a two- to fourfold increase in rNLRR-3 mRNA in rat normal fibroblasts (3Y1). When cells expressing H-Ras(V12) were treated with mitogen activated protein kin ase (MAPK) kinase inhibitors (U0126, PD98059), suppression of rNLRR-3 mRNA correlated well with a reduction in MAPK activity. Epidermal growth factor (EGF) led to elevation of rNLRR-3 gene expression about 4 h after stimulati on of normal fibroblasts. U0126 completely suppressed the induction by EGF of rNLRR-3 mRNA with abrogation of MAPK phosphorylation. U0126 inhibited th e basal transcription of rNLRR-3. LY294002, a PI3 kinase inhibitor, showed a lesser effect on expression of the gene. These results indicate that rNLR R-3 gene expression is regulated mainly through the Ras-MAPK signaling path way in fibroblasts. (C) 2001 Academic Press.