Article ID Journal Published Year Pages File Type
5528511 Matrix Biology 2017 12 Pages PDF
Abstract

•Ltbp4S knock out mice develop centrilobular emphysema reminiscent of late stage COPD.•Ltbp4S induces Pdgfrβ signaling by inhibiting the antioxidant Nrf2/Keap1 pathway in a TGFβ-dependent manner.•Pdgfrβ promotes lung regeneration and injury repair•Loss of Ltbp4 upregulates the Sesn2/PDGFRβ suppressor pathway which is overexpressed in lungs of individuals with COPD•As a major player in lung remodeling, Ltbp4S is likely involved in the pathogenesis of COPD.

Latent transforming growth factor beta binding protein 4 (LTBP4) belongs to the fibrillin/LTBP family of proteins and plays an important role as a structural component of extracellular matrix (ECM) and local regulator of TGFβ signaling. We have previously reported that Ltbp4S knock out mice (Ltbp4S −/−) develop centrilobular emphysema reminiscent of late stage COPD, which could be partially rescued by inactivating the antioxidant protein Sestrin 2 (Sesn2). More recent studies showed that Sesn2 knock out mice upregulate Pdgfrβ-controlled alveolar maintenance programs that protect against cigarette smoke induced pulmonary emphysema. Based on this, we hypothesized that the emphysema of Ltbp4S −/− mice is primarily caused by defective Pdgfrβ signaling. Here we show that LTBP4 induces Pdgfrβ signaling by inhibiting the antioxidant Nrf2/Keap1 pathway in a TGFβ-dependent manner. Overall, our data identified Ltbp4 as a major player in lung remodeling and injury repair.

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