NF-ΚB AND JAK/STAT PATHWAYS INHIBITION REVERSES FIBROSIS IN A MURINE MODEL OF INFLAMMATION-DRIVEN MYELOFIBROSIS (EHA 2023)
Aims: To assess whether inhibition of NF-κB and/or JAK/STAT signaling can attenuate the inflammatory state and reverse the MF-like phenotype in an aged miR-146a -/- mouse model, using either (a) the JAK1/2 inhibitor ruxolitinib (RUX), (b) the NF-κB pathway inhibitor, through IKKα/β, BMS-345541 (BMS), (c) RUX+BMS, or (d) the dual JAK2/IRAK1 inhibitor pacritinib (PAC). In an aging-associated MF-like murine model without driver mutations, NF-κB inhibitors, either alone or incombination with JAK inhibitors, as well as dual-acting inhibitors, reduced inflammatory cytokines and splenomegaly, reversed thrombocytopenia and improved BM fibrosis. The combination therapy (RUX+BMS) produced BM aplasia and worsened anemia, whereas the dual inhibitor (PAC) improved or stabilized hematologic parameters. Bone Marrow Fibrosis, Myelofibrosis, NF- B, Myeloproliferative disorder