Microarray analysis of B-cell lymphoma cell lines with the t(14;18)

Area of Science:

• Hematology
• Oncology
• Molecular Biology

Background:

• The t(14;18) translocation is common in follicular lymphoma and some diffuse large B-cell lymphomas (DLBCL), causing BCL-2 over-expression.
• BCL-2 over-expression is crucial for lymphomagenesis but insufficient alone for malignant lymphoma development.

Purpose of the Study:

• To identify additional genes involved in follicular lymphoma genesis and DLBCL progression.
• To analyze global transcriptional changes in t(14;18)-positive lymphoma cell lines.

Main Methods:

• Gene expression profiling of t(14;18)-positive lymphoma cell lines and t(11;14)-positive mantle-cell lymphoma cell lines using cDNA microarrays.
• Comparison of gene expression profiles with purified B-cells from hyperplastic tonsils.
• Validation of differentially expressed genes using quantitative real-time PCR and immunoblotting.

Main Results:

• 137 genes showed at least twofold differential expression in t(14;18) cell lines compared to tonsillar B-cells.
• 68 genes were up-regulated (proliferation, survival, metabolism) and 69 down-regulated (cell adhesion, growth regulation).
• Hierarchical clustering distinguished t(14;18) and mantle-cell lymphoma cell lines; ~80% of selected gene changes were confirmed.

Conclusions:

• cDNA microarray analysis effectively assesses global transcriptional changes in t(14;18)-positive lymphoma cell lines.
• This approach identified novel genes potentially contributing to non-Hodgkin's lymphoma development and progression.
• Further research into these genes may offer new therapeutic targets for lymphomas with the t(14;18) translocation.