Ddx5 Targeted Epigenetic Modification of Pericytes in Pulmonary Hypertension Following Intrauterine Growth Restriction.

Newborns with intrauterine growth restriction (IUGR) have a higher likelihood of developing pulmonary arterial hypertension (PAH) in adulthood. While there is increasing evidence suggesting that pericytes play a role in regulating myofibroblast transdifferentiation and angiogenesis in malignant and cardiovascular diseases, their involvement in the pathogenesis of IUGR-related PH and the underlying mechanisms remain incompletely understood. To address this issue, a study was conducted utilizing a Sprague-Dawley (SD) rat model of IUGR-related PH. Our investigation revealed increased proliferation and migration of pulmonary microvascular pericytes in IUGR-related PH, accompanied by weakened endothelial-pericyte interactions. Through whole transcriptome sequencing, DEAD-box protein 5(DDX5) was identified as one of the hub genes in pericytes. DDX5, a member of the RNA helicase family, plays a role in the regulation of ATP-dependent RNA helicase activities and cellular function. MicroRNAs have been implicated in the pathogenesis of PAH, and microRNA-205(miR-205) regulates cell proliferation, migration, and angiogenesis. The results of dual-luciferase reporter assays confirmed the specific binding of miR-205 to Ddx5 . Mechanistically, miR-205 negatively regulates Ddx5 , leading to the degradation of β-catenin by inhibiting the phosphorylation of Gsk3β at serine 9. In vitro experiments showed the addition of miR-205 effectively ameliorated pericyte dysfunction. Furthermore, in vivo experiments demonstrated that miR-205 agomir could ameliorate PH. Our findings indicated that the downregulation of miR-205 expression mediates pericyte dysfunction through the activation of Ddx5. Therefore, targeting the miR-205/Ddx5/p-Gsk3β/β-catenin axis could be a promising therapeutic approach for IUGR-related PH.