Prognosis of pulmonary fibrosis with usual interstitial pneumonia pattern in myeloperoxidase anti-neutrophil cytoplasmic autoantibody-related nephritiss

Watanabe, Toshikazu; Minezawa, Tomoyuki; Gotô, Yasuhiro; Okamura, Takuya; Sakakibara, Yosuke; Niwa, Yoshikazu; Hayashi, Masamichi; Hasegawa, Midori; Imaizumi, Kazuyoshi

doi:10.1183/13993003.congress-2018.pa2941

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Patients on the antifibrotic drug nintedanib may have reduced incidence of AE-IPF (22), supporting cross-talk between acute inflammatory responses and chronic fibrosis, but no specific therapies have yet proven effective in their treatment. Repeated sub-acute injury to alveolar epithelial cells is also likely to drive chronic decline in IPF (23,24), where diffuse alveolar damage can be seen without clinical evidence of an acute exacerbation (25).…”

Section: Introductionmentioning

confidence: 99%

CD98 is critical for a conserved inflammatory response to diverse injury stimuli relevant to IPF exacerbations and COVID pneumonitis

Stylianou

Rushwan

Wang

et al. 2022

Preprint

View full text Add to dashboard Cite

Progressive fibrosing interstitial lung diseases (PFILDs) cause substantial morbidity and mortality. Antifibrotic agents slow progression, but most of the clinical need remains unmet. The archetypal PFILD is idiopathic pulmonary fibrosis (IPF). Chronic progression is driven by transforming growth factor (TGF-)β1 signalling. It is punctuated by inflammatory flares known as acute exacerbations (AE-IPF), which are associated with accelerated decline and high mortality. We hypothesized that acute injury responses underlying exacerbations and the mechanisms of chronic fibrosis overlap at the molecular level, via a cell surface assembly nucleated by galectin-3 that we term the 'gal-3-fibrosome'. We focused upon a putative pro-inflammatory galectin-3 ligand, the CD98:integrin complex. Our data indicate CD98 and β1-integrin co-localise with galectin-3 within epithelial cells in IPF lung tissue, and within 40 nm in human lung tissue treated with TGF-β1 compared to controls. CD98 is required for interleukin (IL-)6 and IL-8 responses to biochemical and biophysical conditions mimicking stimuli of AE-IPF in vivo, ex vivo and in cells, and for an interstitial neutrophilic response in a mouse model. We demonstrate this pathway progresses via intracellular influx of Ca2+ mediated by TRPV4, and NF-κB activation, operating in positive feedback. Lastly we show the CD98- and galectin-3-dependence of IL-6 and IL-8 responses to the SARS-CoV-2 spike protein receptor binding domain and the conservation of this response pattern between lung epithelial cells and monocyte-derived macrophages. Taken together our findings identify CD98 as a key mediator of both pro-fibrotic and acute inflammatory responses in the lung with relevance to AE- and chronic progression of IPF, and the priming of fibrotic lungs for acute inflammatory responses. They similarly implicate CD98 and galectin-3 as mediators of COVID pneumonitis and worse outcomes in ILD patients with COVID.

show abstract