The invention provides application of a Phb2 inhibitor YL-939 in preparation of a
medicine for treating pulmonary arterial hypertension, and relates to the technical field of
medicine development. In the pulmonary arterial hypertension
disease process, the
histone lactylation level is remarkably increased, and the Phb2 can be used as a
histone lactylation modifying
enzyme for up-regulating expression in pulmonary arterial hypertension and playing an important role, and can lead to abnormal proliferation of
vascular smooth muscle cells and
pathological change of vascular walls by promoting
histone lactylation modification. Through targeted inhibition of Phb2,
pulmonary artery blood vessel middle layer thickening can be significantly relieved, the
small artery myelization degree can be reduced, extravascular collagen deposition can be inhibited, and thus pulmonary circulation dynamics can be improved. As a Phb2 inhibitor, YL-939 can effectively relieve
ventricular hypertrophy caused by pulmonary arterial hypertension, has no obvious toxic or
side effect, and shows unique advantages and good application prospects in the aspect of treating pulmonary arterial hypertension.