Opposing actions of Stat1 and Stat6 on IL-13-induced up-regulation of early growth response-1 and platelet-derived growth factor ligands in pulmonary fibroblasts.

Published

Journal Article

IL-13 is a key cytokine involved in airway remodeling in asthma. We previously reported that IL-13 stimulated the mitogenesis of lung fibroblasts via platelet-derived growth factor (PDGF)-AA. In this report, we show that IL-13 increases PDGF-A and PDGF-C mRNA levels through a dual intracellular cascade that requires coactivation of Stat6 and Stat1 to impact transcriptional regulation of the early growth response (Egr)-1 gene, which then drives PDGF expression. Increased levels of PDGF-AA and PDGF-CC protein were observed in vivo in the airways of IL-13 transgenic mice. IL-13 up-regulated PDGF-A and PDGF-C mRNA levels in lung fibroblasts isolated from three different background strains of mice. However, IL-13-induced PDGF-A and PDGF-C mRNA levels were significantly reduced in Stat6-deficient (Stat6(-/-)) fibroblasts as compared with wild-type Stat6(+/+) fibroblasts. In contrast, IL-13-induced PDGF-A and PDGF-C mRNAs were enhanced in Stat1(-/-) fibroblasts as compared with Stat1(+/+) fibroblasts. IL-13 did not up-regulate PDGF-A or PDGF-C mRNA levels in Egr-1(-/-) fibroblasts. Moreover, IL-13 did not increase Egr-1 mRNA and protein levels in Stat6(-/-) fibroblasts and yet enhanced Egr-1 mRNA and protein levels in Stat1(-/-) fibroblasts. Our findings support the hypothesis that Stat6 and Stat1 exert stimulatory and inhibitory effects on Egr-1 and PDGF ligand mRNA transcription, respectively. This novel mechanism could aid in identifying molecular targets for the treatment of chronic airway remodeling and fibrosis in asthma.

Full Text

Duke Authors

Cited Authors

  • Ingram, JL; Antao-Menezes, A; Mangum, JB; Lyght, O; Lee, PJ; Elias, JA; Bonner, JC

Published Date

  • September 15, 2006

Published In

Volume / Issue

  • 177 / 6

Start / End Page

  • 4141 - 4148

PubMed ID

  • 16951379

Pubmed Central ID

  • 16951379

International Standard Serial Number (ISSN)

  • 0022-1767

Digital Object Identifier (DOI)

  • 10.4049/jimmunol.177.6.4141

Language

  • eng

Conference Location

  • United States