Similar protocols were used
for immunoblot analysis of cell protein extracts from MC3T3 - E1 (mouse preosteoblasts), U-2 OS (human osteosarcoma), and C2C12 (mouse myoblasts with osteogenic potential).
Cell lysates were harvested and subjected to
immunoblot analysis for MEK1, MEK2, MKK3, MKK6, phosphorylated ERK1 / 2 (p - ERK1 / 2), total ERK1 / 2 (t - ERK1 / 2), phosphorylated p38 (p - p38), total p38 (t - p38) and actin.