Figure 4. Changes in lipid profiles according to kidney age and periostin expression. (A) chE and cholesterol were significantly increased in aged WT mice compared to young mice, but to a lesser extent in aged Postn-null mice. Data are the mean ± SEM. *p < 0.05 (unpaired t-test); ***p < 0.001 (unpaired t-test). (B, C) SM and Cer did not differ between the groups, but C1P was higher in aged WT mice than in aged Postn-null mice. Data are the mean ± SEM. **p < 0.01 (unpaired t-test). (D) LPC was increased in all aged mice, with no difference between WT mice and Postn-null mice. In contrast, PC was significantly lower in aged Postn-null mice than in aged WT mice. Data are the mean ± SEM. **p < 0.01 (unpaired t-test).