TGFB1 and Bloom syndrome: Herein, we further examined different stimulators for the progression of pulmonary fibrosis and found that there was a markedly increased expression of TGF-β both in the BLM- and BLM + LPS-treated THP-1 cells (Figure 4E, 4G and Figure S3C) and even in the treated THP-1-derived conditional medium (Figure 4F).