Downregulation of DUOX1 function contributes to aging-related impairment of innate airway injury responses and accelerated senile emphysema

Aging is associated with a gradual loss of lung function due to increased cellular senescence, decreased regenerative capacity and impaired innate host defense. One important aspect of innate airway epithelial host defense to non-microbial triggers is the secretion of alarmins such as IL-33 and acti...

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Published in:American journal of physiology. Lung cellular and molecular physiology 2021-07, Vol.321 (1), p.L144-L158
Main Authors: Schiffers, Caspar, Lundblad, Lennart K A, Hristova, Milena, Habibovic, Aida, Dustin, Christopher M, Daphtary, Nirav, Aliyeva, Minara, Seward, David J, Janssen-Heininger, Yvonne M W, Wouters, Emiel F M, Reynaert, Niki L, van der Vliet, Albert
Format: Article
Language:English
Subjects:
Age
Aging
Allergens
Emphysema
Enlargement
Homology
Inflammation
Injuries
Lungs
Mitochondria
NAD(P)H oxidase
NADPH
Nicotinamide
Nucleotides
Respiratory function
Respiratory tract
Senescence
Signaling
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Summary:Aging is associated with a gradual loss of lung function due to increased cellular senescence, decreased regenerative capacity and impaired innate host defense. One important aspect of innate airway epithelial host defense to non-microbial triggers is the secretion of alarmins such as IL-33 and activation of type 2 inflammation, which were previously found to depend on activation of the NADPH oxidase (NOX) homolog DUOX1, and redox-dependent signaling pathways that promote alarmin secretion. Here, we demonstrate that normal aging of C57BL/6J mice resulted in markedly decreased lung innate epithelial type 2 responses to exogenous triggers such as the airborne allergen, D. pteronyssinus, which was associated with marked downregulation of DUOX1, as well as DUOX1-mediated redox-dependent signaling. DUOX1-deficiency was also found to accelerate age-related airspace enlargement and decline in lung function, but did not consistently affect other features of lung aging such as senescence-associated inflammation. Intriguingly, observations of age-related DUOX1 downregulation and enhanced airspace enlargement due to DUOX1 deficiency in C57BL/6J mice, which lack a functional mitochondrial nicotinamide nucleotide transhydrogenase (NNT), were much less dramatic in C57BL/6NJ mice with normal NNT function, although the latter mice also displayed impaired innate epithelial injury responses with advancing age. Overall, our findings indicate a marked aging-dependent decline in (DUOX1-dependent) innate airway injury responses to external non-microbial triggers, but the impact of aging on DUOX1 downregulation and its significance for age-related senile emphysema development was variable between different C57BL6 substrains, possibly related to metabolic alterations due to differences in NNT function.
ISSN:1040-0605
1522-1504
DOI:10.1152/AJPLUNG.00021.2021