Gremlin-mediated Decrease in Bone Morphogenetic Protein Signaling Promotes Pulmonary Fibrosis

Overview

Journal Am J Respir Crit Care Med

Specialty Critical Care

Date 2007 Nov 3

PMID 17975199

Citations 82

Authors

Marjukka Myllarniemi

Pamela Lindholm

Merja J Ryynanen

Corrine R Kliment

Kaisa Salmenkivi

Jorma Keski-Oja

Vuokko L Kinnula

Tim D Oury

Katri Koli

Affiliations

Soon will be listed here.

Abstract

Rationale: Members of the transforming growth factor (TGF)-beta superfamily, including TGF-betas and bone morphogenetic proteins (BMPs), are essential for the maintenance of tissue homeostasis and regeneration after injury. We have observed that the BMP antagonist, gremlin, is highly up-regulated in idiopathic pulmonary fibrosis (IPF).

Objectives: To investigate the role of gremlin in the regulation of BMP signaling in pulmonary fibrosis.

Methods: Progressive asbestos-induced fibrosis in the mouse was used as a model of human IPF. TGF-beta and BMP expression and signaling activities were measured from murine and human fibrotic lungs. The mechanism of gremlin induction was analyzed in cultured lung epithelial cells. In addition, the possible therapeutic role of gremlin inhibition was tested by administration of BMP-7 to mice after asbestos exposure.

Measurements And Main Results: Gremlin mRNA levels were up-regulated in the asbestos-exposed mouse lungs, which is in agreement with the human IPF biopsy data. Down-regulation of BMP signaling was demonstrated by reduced levels of Smad1/5/8 and enhanced Smad2 phosphorylation in asbestos-treated lungs. Accordingly, analyses of cultured human bronchial epithelial cells indicated that asbestos-induced gremlin expression could be prevented by inhibitors of the TGF-beta receptor and also by inhibitors of the mitogen-activated protein kinase kinase/extracellular signal-regulated protein kinase pathways. BMP-7 treatment significantly reduced hydroxyproline contents in the asbestos-treated mice.

Conclusions: The TGF-beta and BMP signaling balance is important for lung regenerative events and is significantly perturbed in pulmonary fibrosis. Rescue of BMP signaling activity may represent a potential beneficial strategy for treating human pulmonary fibrosis.

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