Wnt Signaling Regulates Smooth Muscle Precursor Development in the Mouse Lung Via a Tenascin C/PDGFR Pathway

Overview

Journal J Clin Invest

Specialty General Medicine

Date 2009 Aug 20

PMID 19690384

Citations 100

Authors

Ethan David Cohen

Kaori Ihida-Stansbury

Min Min Lu

Reynold A Panettieri

Peter Lloyd Jones

Edward E Morrisey

Affiliations

Soon will be listed here.

Abstract

Paracrine signaling from lung epithelium to the surrounding mesenchyme is important for lung SMC development and function and is a contributing factor in an array of pulmonary diseases such as bronchopulmonary dysplasia, pulmonary hypertension, and asthma. Wnt7b, which is exclusively expressed in the lung epithelium, is important for lung vascular smooth muscle integrity, but the underlying mechanism by which Wnt signaling regulates lung SMC development is unclear. In this report, we have demonstrated that Wnt7b regulates a program of mesenchymal differentiation in the mouse lung that is essential for SMC development. Genetic loss-of-function studies showed that Wnt7b and beta-catenin were required for expression of Pdgfralpha and Pdgfrbeta and proliferation in pulmonary SMC precursors. In contrast, gain-of-function studies showed that activation of Wnt signaling increased the expression of both Pdgfralpha and Pdgfrbeta as well as the proliferation of SMC precursors. We further showed that the effect on Pdgfr expression was, in part, mediated by direct transcriptional regulation of the ECM protein tenascin C (Tnc), which was necessary and sufficient for Pdgfralpha/beta expression in lung explants. Moreover, this pathway was highly upregulated in a mouse model of asthma and in lung tissue from patients with pulmonary hypertension. Together, these data define a Wnt/Tnc/Pdgfr signaling axis that is critical for smooth muscle development and disease progression in the lung.

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