作者: T.G. Tessner , C.O. Rock , G.B. Kalmar , R.B. Cornell , S. Jackowski
DOI: 10.1016/S0021-9258(18)55286-8
关键词: Endocrinology 、 Cell cycle 、 Macrophage colony-stimulating factor 、 Colony-stimulating factor 、 Molecular biology 、 Protein biosynthesis 、 Cytidylyltransferase 、 Growth factor 、 Internal medicine 、 Phosphocholine 、 Biology 、 Cycloheximide
摘要: Growth factor regulation of phosphatidylcholine (PtdCho) metabolism during the G1 stage cell cycle was investigated in colony-stimulating 1 (CSF-1)-dependent murine macrophage cell-line BAC1.2F5. The transient removal CSF-1 arrested cells G1. Incorporation [3H]choline into PtdCho stimulated significantly h after growth addition to quiescent cells. Metabolic labeling experiments pointed CTP:phosphocholine cytidylyltransferase (CT) as rate-controlling enzyme for biosynthesis BAC1.2F5 amount CT mRNA increased 4-fold within 15 min and remained elevated 2 h. rise levels accompanied by a 50% increase total specific activity extracts 4 CSF-1. CSF-1-dependent elevation content neither attenuated nor superinduced inhibition protein synthesis with cycloheximide. rate turnover decreased presence indicating that message stabilization key determining mRNA. These data point abundance component factor-stimulated synthesis.