Figure 2  LMP1 Promotes B-1a Lymphomas That Can Escape Allelic Exclusion
(A) Flow cytometry analysis of splenocytes from a WT or LMP1 transgenic lymphoma for the pan–B cell (CD19), B-1a cell (CD5), and Ig heavy chain (IgM and IgD) and light chain (κ and λ) markers. Shown are the results from WT lymphoma 1 and LMP1 transgenic lymphoma 4. This analysis was repeated on four other LMP1 transgenic lymphomas (1, 2, 3, and 6) showing a similar B-1a phenotype, of which lymphomas 2 and 4 were also doubly positive for κ and λ light chains.
(B) Flow cytometry analysis of WT or LMP1 transgenic splenocytes for B-1a (CD19+CD5+) and B-1b or B2 subsets (CD19+CD5−). Percentages of B-1a and B-1b or B2 subsets are shown in each quadrant. This analysis was repeated on three other WT and two other LMP1 transgenic mice with similar results.
(C) Immunoblot analysis for κ and λ light chains of B cells (CD19+) purified from WT and LMP1 transgenic mice. Actin was used as a loading control.