Valuated by the Ct method as follows: Ct = Ct value of reference RPLPO - Ct value of mRNA of interest. The relative expression levels of the mRNA of interest corresponded to the 2^(Ct)*1000 value.The statistical analyses were performed using the SPSS software package, version 18.0 (SPSS Inc. Chicago, IL). Statistical difference of mRNA expressions was calculated using ANOVA with Dunnett test for a