NCIt definition : An orally bioavailable agonist of the human beta-3 adrenergic receptor (ADRB3), with
muscle relaxing, neuroprotective and potential antineoplastic activities. Upon oral
administration, mirabegron binds to and activates ADRB3, which leads to smooth muscle
relaxation. Mirabegron also restores sympathetic stimulation in mesenchymal stem cell
(MSC) niches, inhibits JAK2-mutated hematopoietic stem cell (HSC) expansion and blocks
the progression of myeloproliferative neoplasms (MPNs). Lack of sympathetic stimulation
of the MSC and HSC niche is associated with the development of MPNs.;