BCL-XL drives fibrotic and leukemic progression in myeloproliferative neoplasms. (PubMed, Front Immunol)
The cytotoxic and antifibrotic effects of the BCL-XL inhibitor ABT-263 (navitoclax), alone or combined with the JAK2 inhibitor ruxolitinib, were evaluated in stromal and hematopoietic contexts. Combined inhibition of BCL-XL and JAK2 produced synergistic antifibrotic and pro-apoptotic effects in MSCs, post-MPN acute myeloid leukemia (AML) cell lines, and patient-derived cells resistant to ruxolitinib. Collectively, these findings identified BCL-XL as a key mediator of MPN-associated fibrosis and therapeutic resistance, and confirmed dual targeting of BCL-XL and JAK2 as a rational strategy for advanced MPN.