Differential expression analysis in primary Schwann cell cultures of MAL-overexpressing and wild-type mice. (a, b) Schwann cells derived from P1 mice were cultured in the presence or absence of 20 µM forskolin for 24 h and analyzed by qRT-PCR. (a) A substantial induction of Mpz expression was investigated for wild-type and MAL-overexpressing cells upon treatment; however, the expression of Mpz was significantly reduced in MAL-overexpressing Schwann cells compared with wild-type cells. (b) Under both conditions, p75NTR mRNA level was reduced in MAL-overexpressing mice. Upon treatment, p75NTR expression was decreased in both genotypes. Data were normalized to the expression of 60s, and values for unstimulated wild-type samples were set to 1. Data represent the mean of at least 20 independent experiments for unstimulated condition and at least 9 independent experiments for stimulated condition. The error bars indicate the SEM. (c) Gene transcripts implicated in Schwann cell development and differentiation were investigated in untreated Schwann cells by qRT-PCR. Data were normalized to the expression of 60s, and wild-type values were set to 1. The columns show the mean value of at least nine independent experiments, and the error bars indicate the SEM. *p < 0.0001. #p < 0.01.