Arginine metabolism is increased in the idiopathic pulmonary fibrosis (IPF) lung. Arginine metabolism is increased in the idiopathic pulmonary fibrosis (IPF)

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Presentation transcript:

Arginine metabolism is increased in the idiopathic pulmonary fibrosis (IPF) lung. Arginine metabolism is increased in the idiopathic pulmonary fibrosis (IPF) lung. (A) The classical arginine metabolic pathway. (B) In all graphs, the metabolic data for control lung (NL) are shown in green boxes, and data for IPF lung are represented in purple boxes. Quantities are in arbitrary units specific to the internal standards for each quantified metabolite and normalised to protein concentration (n=8 for each box; y-axis label of metabolic changes is shown as counts×106). We found significantly increased polyamines putrescine and spermidine as well as increased 4-hydroxyproline and creatine (p<0.05, increase highlighted in red open box and decrease in green open box). Increased polyamine levels indicate increased cell proliferation, and creatine may provide some of the energy required. Increased 4-hydroxyproline is a marker of fibrosis. Decreased aspartate and fumarate may indicate that arginine metabolism is shuttling intermediates away from the tricarboxylic acid cycle. 5-MTA, 5′-methylthioadenosine; ECM, extracellular matrix; OAT,Ornithine aminotransferase. Yidan D Zhao et al. BMJ Open Resp Res 2017;4:e000183 ©2017 by British Thoracic Society