ACUTE lung injury (ALI) may be significantly improved through lysine supplementation, according to new preclinical research demonstrating enhanced survival and lung repair via restoration of cellular function.
Acute lung injury remains a major clinical challenge, often progressing to acute respiratory distress syndrome and pulmonary fibrosis, both associated with high mortality and limited treatment options. While metabolic reprogramming has been recognised as essential for lung regeneration, the role of amino acids in this process has remained unclear.
Lysine Targets Acute Lung Injury Repair Mechanisms
In this study, researchers identified lysine depletion in injured lung epithelial cells through integrated single-cell RNA sequencing and plasma metabolomics analyses of human ALI samples. This deficiency was linked to impaired mitochondrial metabolism, suggesting a critical metabolic vulnerability in acute lung injury.
Supplementation with lysine produced striking therapeutic effects in experimental models. Survival rates in mice increased from 0% to 62.5%, alongside marked reductions in inflammation, alveolitis, and extracellular matrix deposition. Similar protective effects were observed in non-human primate models, reinforcing the translational potential of lysine in acute lung injury.
Mechanistically, lysine restored acetyl-coenzyme A availability, enabling recovery of α-tubulin acetylation. This process proved essential for maintaining ciliary function in pulmonary epithelial cells. By stabilising ciliary signalling, lysine prevented pathological calcium influx driven by STIM1–TRPC1 complex formation, ultimately preserving epithelial barrier proteins such as E-cadherin and ZO-1.
Regeneration Pathways in Acute Lung Injury
Notably, the regenerative effects of lysine were most pronounced in surfactant protein C-positive alveolar epithelial type II cells, which play a central role in lung repair. Enhanced ciliogenesis in these cells suggested that lysine directly supports epithelial regeneration in acute lung injury.
These findings position lysine as both a metabolic and structural regulator, linking cellular energy pathways to calcium homeostasis and tissue repair.
The work remains preclinical, and further studies are required to confirm efficacy and safety in humans. However, if validated in clinical trials, lysine supplementation could represent a novel, accessible therapeutic strategy for acute lung injury, addressing a critical unmet need in respiratory medicine.
Reference
Yang W et al. Lysine attenuates acute lung injury by restoring α-tubulin acetylation and ciliary activity. Cell Death Discov. 2026; DOI:10.1038/s41420-026-03025-x.
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