Real-time PCR analysis was performed with primers and probe sets from Applied Biosystems, as described (Liu et al., 2009 (link)). Immunoblots were performed as described previously (Liu et al., 2010 (link)), using the primary antibodies anti-CD115, anti-phosphorylated (T37/46) 4E-BP1 (236B4), anti-phosphorylated (S235/236) S6 (DX57.2.2E), anti-phosphorylated ERK1/2 (D13.14.4E), anti-phosphorylated (S473) AKT (D9E), anti-S6 (5G10), anti-4E-BP-1 (53H11), anti-ERK1/2 (137F5), anti Akt (polyclonal; all from Cell Signaling Technology), anti-SREBP2 (ab30682; Abcam), and anti-β-actin (AC-74; Sigma-Aldrich) and the secondary horseradish peroxidase–conjugated antibodies anti–rabbit IgG (W401B) and anti–mouse IgG (W402B; both from Promega).