WHI-P131 (CAS 202475-60-3) is a dual-function inhibitor of JAK3 tyrosine kinase that
demonstrated potent in vivo anti-inflammatory and anti-leukemic activity in several preclinical animal models.
This is the first report of the development of nanoparticle (NP) constructs of WHI-P131.
Fourty-eight distinct NP formulations were prepared and WHI-P131 encapsulation efficiencies
> 95% and intraliposomal WHI-P131 concentrations >10 mg/mL were achieved in lead NP
formulations. The anti-cancer activity of WHI-P131-NP, a PEGylated lead formulation
was tested in vitro and in vivo. Notably, WHI-P131-NP was capable of causing apoptotic death in primary leukemia
cells from chemotherapy-resistant acute lymphoblastic leukemia (ALL) as well as chronic
lymphocytic leukemia (CLL) patients. WHI-P131-NP was also active in the RS4;11 SCID
mouse xenograft model of chemotherapy-resistant B-lineage ALL. The life table analysis
showed that WHI-P131-NP was more effective than WHI-P131 (P = 0.01), vincristine (P<0.0001),
or vehicle (P<0.0001). These experimental results demonstrate that the nanotechnology-enabled
delivery of WHI-P131 shows therapeutic potential against leukemias with constitutive
activation of the JAK3-STAT3/STAT5 molecular target.
Key words
Acute lymphoblastic leukemia cells - Anti-leukemia agent - CAS 202475-60-3 - JAK3
tyrosine kinase inhibitor - WHI-P131, nanoparticle constructs