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. 2015 Sep 28;210(7):1117–1131. doi: 10.1083/jcb.201504007

Figure 9.

Figure 9.

P2Y1 receptor-induced p38 activation is mediated by a ubiquitin- and TAB1–TAB2-dependent pathway. (A) HA-tagged P2Y1 WT or K3R mutant expressed in HeLa cells were stimulated with 10 µM ADP and ubiquitination was detected. See Fig. S5 (A–C). (B) HA-P2Y1 WT or K3R HeLa cells were stimulated with 10 µM ADP, and p38, MSK1, and ERK1/2 phosphorylation was detected. The data (mean ± SD [error bars], n = 3) were analyzed using a Student’s t test (*, P < 0.05; **, P < 0.01). (C) HA-P2Y1 HeLa cells transfected with ns or NEDD4-2 siRNA were treated with 10 µM ADP, and p38, MSK1, and ERK1/2 phosphorylation was detected. The data (mean ± SD [error bars], n = 3) were analyzed using a Student’s t test (*, P < 0.05; **, P < 0.01). See Fig. S5 (D and E). (D) HA-P2Y1 HeLa cells pretreated with DMSO or 5 µM SB203580 for 20 min were stimulated with 10 µM ADP, and p38, MSK1, and ERK1/2 phosphorylation was detected. Data (mean ± SD [error bars], n = 3) were analyzed using a Student’s t test (*, P < 0.05; **, P < 0.01). (E) HA-P2Y1 HeLa cells transfected with ns or TAB1 and TAB2 siRNA were stimulated with 10 µM ADP, and p38 and MSK1 phosphorylation was detected. The data (mean ± SD [error bars], n = 3) were analyzed using a Student’s t test (**, P < 0.01; ***, P < 0.001). See Fig. S5 F. (F) HA-P2Y1 HeLa cells were stimulated with 10 µM ADP, and TAB1 expression was detected. The data (mean ± SD [error bars], n = 3) were analyzed using a Student’s t test (***, P < 0.001).