Figure 3. Effects of soluble klotho on the expression of proteins belonging to the KLF4 pathway in wild-type and klotho (-/-) MEFs. (A–D) qRT-PCR analysis of soluble klotho and KLF4. Total RNA samples were prepared from soluble klotho-transfected MEFs, and quantitative RT-PCR analysis was performed using the primers described. (E, F) The expression of proteins related to the KLF4 pathway. Wild-type and klotho (-/-) MEFs were transfected with soluble klotho expression plasmids (pcDNA3-soluble klotho). At 48 h after transfection, Western blot analysis was performed to assess the KLF4, mTOR, p70S6K, p21, AMPK, cyclin D1, cyclin B1, SOD1, and SOD2 levels. The mean ± S.D. of three independent experiments is shown (*p < 0.05, **p < 0.01).