Figure 3.
Increased incidence of MBL/CLL/lymphoma in B1 B cells with ATA BCR. (A) Self-Thy-1 antigen-dependent CD5 induction by ATA B cells through B-1 development does not involve CD40 signal. Comparative CD5 level by mature (AA4–) ATA B cells (ATAid+) in PerC in 2-mo-old ATAμκTg mice in Thy-1−/− versus WT (Thy-1+/+) and CD40−/− (n = 5; mean ± SE). (B) Increased ATA B cell frequency in PBL B cells in aging ATAμTg mice. (left) ATA B increased case (marked) as MBL at 12 mo, with further B220 reduction. CD5 reduction also occurred in around half the cases of increased ATA B cells. (C) ATA B-CLL/lymphoma incidence in ATAμTg and ATAμκTg mice with or without TCL1 Tg (left). Incidence over time by ATA μκTg mice (middle). (right) Splenomegaly by TC+ATAμκTg mice (>90% cases) together with CLL (top), and representative total spleen cell data analysis (bottom).
