Randomized trial demonstrates that targeting polyamine synthesis reduces collagen production in lung fibroblasts, indicating potential therapeutic strategies.
Key Points
This research aims to investigate how ornithine metabolism affects collagen production in lung fibroblasts during TGF-β stimulation.
Normal human lung fibroblasts (NHLFs) and HLFs from idiopathic pulmonary fibrosis patients (IPF HLFs) were treated with TGF-β in the presence or absence of ornithine.
Fibroblast activation was measured using qPCR and Western blot for collagen 1 and α-Smooth Muscle Actin expression.
Ornithine metabolism was inhibited using siRNA to knock down ODC or OAT enzymes.
Ornithine deprivation did not significantly alter cellular proline levels or collagen synthesis in TGF-β-treated HLFs.
Metabolic labeling indicated that extracellular ornithine primarily led to putrescine synthesis.
Knockdown of ODC reduced collagen mRNA and protein expression but OAT knockdown did not affect fibroblast activation.