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. 2022 Oct 20;9:1011732. doi: 10.3389/fnut.2022.1011732

FIGURE 3.

FIGURE 3

Effects of butyrate in idiopathic pulmonary fibrosis (IPF). IPF is a chronic, progressive, and fibrotic lung disease. Healthy tissue is replaced by an extracellular matrix (ECM) composed by collagen in a TGF-β dependent way. In this condition the alveolar architecture is compromised, leading to decreased lung compliance, disrupted gas exchange, and respiratory failure. TGF-β alters the metabolism and induces pulmonary fibroblasts differentiation, lowering their mitochondrial NADH, NADH/NAD, and ATP levels, as well as oxidative phosphorylation activity. Butyrate acts as a potent antifibrotic factor, restoring mitochondrial activity, and affecting myofibroblast differentiation. TGF-β, transforming growth factor beta; NAD, nicotinamide adenine dinucleotide; NADH, nicotinamide adenine dinucleotide + hydrogen; ATP, adenosine 5’-triphosphate.