After a 6-day osteogenic induction, murineMC3T3-E1 cells were incubated
using a serum-free medium, which contained Rb2 and/or H2O2
for 2 days. The total cellular RNA was extracted from these cells using
Trizol reagent. Single strand cDNA synthesis was determined using the
Prime Script RT reagent kit (TaKaRa). The RT-PCR was performed
using the CFX96 (BIO-RAD) instrument, and individual PCRs were conducted
in 96-well optical reaction plates using SYBR Green-I (TaKaRa)
according to the manufacturer's instructions. Target gene (Alp, Col1a1,
Ocn and Opn) expressions were normalized to the reference gene
β-actin. The 2−ΔΔCt method was applied to calculate the relative gene
expression. These PCR products were subjected to a melting curve
analysis and a standard curve to confirm the correct amplification. All
of the PCRs were performed in triplicate, and the primers used for PCR
are shown in Table 1.