PDGFRB and pemphigus foliaceus: Platelet-derived growth factor receptor β (PDGFRβ) is expressed in pericytes, and a study demonstrated that the pulmonary vascular endothelial cell-derived exosome miR-107 could target HIF-1α to regulate PDGFRβ and mitigate pericyte-promoted PF progression by inhibiting the HIF-1α/Notch1/PDGFRβ/YAP1/Twist1 signaling pathway (Wang et al., 2021).