Extended Data Figure 8. Human P2RY8 suppresses GC B cell growth and promotes B cell confinement to the GC in mice.

(a, b) P2RY8 mutations arising in GCB-DLBCL and BL disrupt receptor expression. Flag-tagged versions of six point mutant and the wild-type receptor were expressed in WEH231 B cells and surface expression examined by FLAG flow cytometry (a). The transduction efficiency of each construct was confirmed to be similar based on IRES-Thy 1.1 reporter expression (b). (c, d) Fold change in Thy1.1 reporter⁺ GC relative to Fo B cells from mLN of chimeras described in Fig. 4d-e. (e-g) Immunohistochemical analysis of splenic sections from SRBC-immunized mice given Ig-transgenic (e), Gpr183^+/- (f) or Gna13 WT or KO (g) B cells transduced as in Fig. 4f and g and assessed 24 h after cell transfer. Data in e and g are additional examples of the experiments shown in Fig. 4f and g, respectively. Data in f are representative of 4 independent experiments. Scale bar is 200 μm in e-g. *P<0.05, **P<0.01, unpaired two-tailed Student's t test.