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Rab26 promotes hypoxia-induced hyperproliferation of PASMCs by modulating the AT1R-STAT3-YAP axis.

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Rab26 protein drives pulmonary artery smooth muscle cell proliferation and vascular remodeling in pulmonary arterial hypertension. Inhibiting Rab26 may offer a new therapeutic approach for this condition.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Mechanisms
  • Molecular Pathology

Background:

  • Pulmonary artery smooth muscle cell (PASMC) hyper-proliferation drives pulmonary vascular remodeling (PVR) in pulmonary arterial hypertension (PAH).
  • Mechanisms of hypoxia-induced PASMC proliferation are not fully understood.

Purpose of the Study:

  • To investigate the role of Rab26 in hypoxia-induced PASMC hyper-proliferation and PVR.
  • To elucidate the molecular pathways involving Rab26 in PAH.

Main Methods:

  • Studied Rab26 expression in rat PASMCs and a mouse model of PAH under hypoxic conditions.
  • Utilized Rab26 silencing and pharmacological inhibitors (AT1R, pSTAT3).
  • Assessed PASMC proliferation, protein expression (pSTAT3, YAP1), and PVR.

Main Results:

  • Hypoxia upregulated Rab26, and Rab26 silencing reduced PASMC hyper-proliferation.
  • Rab26 interacted with AT1R, promoting STAT3 activation and YAP1 nuclear translocation.
  • Rab26 deficiency attenuated hypoxia-induced PVR by downregulating pSTAT3 and YAP1.

Conclusions:

  • Rab26 promotes PASMC hyper-proliferation and PVR via AT1R modulation and the STAT3-YAP pathway under hypoxia.
  • Targeting Rab26 presents a potential therapeutic strategy for PVR and PAH.