Journal: Molecular and Cellular Biology
Article Title: Brain Lipid Binding Protein in Axon-Schwann Cell Interactions and Peripheral Nerve Tumorigenesis
Figure Lengend Snippet: mRNA expression analysis in Nf1 mutant mouse Schwann cells. (A) Microarray analysis was used to compare genome-wide expression levels between normal mouse Schwann cells and Nf1 mutant Schwann cells. The control for each comparison was Cy3-labeled cDNA generated from normal mouse Schwann cell mRNA. For each of four Nf1 mutant Schwann cell samples ( Nf1 +/− , Nf1 −/− , Nf1 −/− TXF, and Nf1 −/− TXF treated with FTI), mRNA was used as a template to synthesize Cy5-labeled cDNA. Cy3- and Cy5-labeled cDNA probes were hybridized simultaneously to the Incyte Genomics MouseGEM 1.0 cDNA microarray. Relative intensities of Cy3 versus Cy5 fluorescent signals for each cDNA target sequence were analyzed with GeneSpring software. The most changes were observed in the Nf1 −/− TXF cells (genes upregulated in Nf1 −/− TXF are red; genes downregulated in Nf1 −/− TXF are green). Expression of one target cDNA, BLBP (black line), was 26-fold above normal in the Nf1 −/− TXF cells and not normalized by FTI treatment. (B) RT-PCR analysis confirmedthe microarray result of elevated BLBP expression in Nf1 −/− TXF cells. Reverse transcriptase (RT) was omitted from duplicate samples to control for DNA contamination. Primers for BLBP (∼200-bp amplicon) and actin control primers (∼500-bp amplicon) were included in the mixture for each 40-cycle reaction. The plasmid positive control for BLBP amplification is the UniGEM clone (Incyte Genomics) containing the BLBP cDNA insert spotted on the microarray. (C) Quantitative real-time PCR of BLBP normalized to GAPDH resulted in a 145-fold change over expression in Nf1 −/− TXF cells compared to wild-type mouse Schwann cells. Rn, fluorescent signal intensity; horizontal starred line, chosen threshold at geometric phase of amplification.
Article Snippet: mRNA isolated from mouse Schwann cells (MicroFastTrack 2.0 kit) was used as a template to create double-stranded cDNA (Superscript preamplification system; Gibco-BRL).
Techniques: Expressing, Mutagenesis, Microarray, Genome Wide, Labeling, Generated, Sequencing, Software, Reverse Transcription Polymerase Chain Reaction, Amplification, Plasmid Preparation, Positive Control, Real-time Polymerase Chain Reaction, Over Expression