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- Title
Adaptation and increased susceptibility to infection associated with constitutive expression of misfolded SP-C.
- Authors
Bridges, James P.; Xu, Yan; Na, Cheng-Lun; Wong, Hector R.; Weaver, Timothy E.
- Abstract
Mutations in the gene encoding SP-C (surfactant protein C; SFTPC) have been linked to interstitial lung disease (ILD) in children and adults. Expression of the index mutation, SP-C[sup Δexon4], in transiently transfected cells and type II cells of transgenic mice resulted in misfolding of the proprotein, activation of endoplasmic reticulum (ER) stress pathways, and cytotoxicity. In this study, we show that stably transfected cells adapted to chronic ER stress imposed by the constitutive expression of SP-C[sup Δexon4] via an NF-κB-dependent pathway. However, the infection of cells expressing SP-C[sup Δexon4] with respiratory syncytial virus resulted in significantly enhanced cytotoxicity associated with accumulation of the mutant proprotein, pronounced activation of the unfolded protein response, and cell death. Adaptation to chronic ER stress imposed by misfolded SP-C was associated with increased susceptibility to viral-induced cell death. The wide variability in the age of onset of ILD in patients with SFTPC mutations may be related to environmental insults that ultimately overwhelm the homeostatic cytoprotective response.
- Subjects
GENETIC mutation; INTERSTITIAL lung diseases; LUNG diseases; ENDOPLASMIC reticulum; CYTOLOGY
- Publication
Journal of Cell Biology, 2006, Vol 172, Issue 3, p395
- ISSN
0021-9525
- Publication type
Article
- DOI
10.1083/jcb.200508016