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These observations suggest that the decreased viability of BaF3 JAK3V674A cells handled with NSC114792 was not triggered from the non specific cytotoxicity of this compound.

Constant with this, remedy of BKO84 cells with anti IL 7Rblocking antibody, which ought to lower JAK3 activity, resulted in decreased cell viability. To evaluate the effect of our compound on JAK3 activity in these cells, we cultured them with numerous concentrations of NSC114792. We observed that remedy with NSC114792 Docetaxel decreased the tyrosine phosphorylation of both JAK3 and STAT5 in a dose dependent manner. Furthermore, we found that BKO84 cells treated with NSC114792 have significantly decreased viability in a time and dose dependent manner. Taken together, our findings suggest that NSC114792 directly binds to JAK3 and inhibits its catalytic activity.

While NSCLC phospho JAK2 and phospho JAK3 were barely detectable in cells without stimulation, their levels were increased in response to PRL and IL 2 stimulation, respectively. As expected, NSC114792 could not inhibit PRL induced JAK2/ STAT5 phosphorylation at the concentrations up to 20 umol/L. By contrast, it did block IL 2 induced JAK3/STAT5 phosphorylation in a dose dependent manner. In fact, IL 2 induced phosphoSTAT5 levels were decreased by more than 80% at a 5 umol/L of NSC114792 compared with those of control, and undetectable at a 10 umol/L. By contrast, treatment of Nb2 cells with AG490 resulted in a profound reduction of both PRL induced JAK2/STAT5 and IL 2 induced JAK3/STAT5 phosphorylation, due to its ability to inhibit all JAKs.

These findings strongly suggest that NSC114792 has selectivity for JAK3 over JAK2. We further assessed E7080 if NSC114792 can specifically inhibit JAK3, but not other JAKs, using various cancer cell lines where constitutively active JAK kinases are expressed.