HDAC6 and idiopathic pulmonary fibrosis: This was opposite to our expectation, because α-tubulin is expected to be less acetylated when HDAC6 expression is increased, and because α-tubulin acetylation is decreased in TGF-β1-treated NHLFs and IPF lung fibroblasts as well as TGF-β1-treated A549 cells [10].