Activation of COL1A2 promoter in human fibroblasts by Escherichia coli

作者：Miyazaki Haruko^*; Kobayashi Ryo; Ishikawa Hiroki; Awano Naoki; Yamagoe Satoshi; Miyazaki Yoshitsugu; Matsumoto Tetsuya

来源：FEMS Immunology and Medical Microbiology, 2012, 65(3): 481-487.

DOI：10.1111/j.1574-695X.2012.00979.x

• fibrosis
• COL1A2 promoter
• Escherichia coli
• lipopolysaccharide
• Toll-like receptor 4

The relationship between bacterial infection and collagen production was investigated using human fibroblasts transfected with the promoter of COL1A2 , which encodes the a1 chain of human type I collagen, linked to a luciferase reporter. The cells were used to assess the gene promoter activity of COL1A2 following bacterial stimulation. The COL1A2 promoter was activated by stimulation with fixed Escherichia coli in a dose-dependent manner, but not by fixed Staphylococcus aureus. Enhancement of collagen production was observed in the E.similar to coli-stimulated fibroblasts compared to those without stimulation. Both anti-human Toll-like receptor (TLR) 4 antibody and polymyxin B clearly blocked the COL1A2 promoter activity stimulated by E.similar to coli, while antibodies against human TLR2 and human transforming growth factor-beta (TGF-beta) receptor type II did not. These results indicate that E.similar to coli can directly interact with TLR4 expressed on the surface of fibroblasts and can further induce human type I collagen gene expression and collagen production in these cells. These data also suggest that infection by gram-negative bacteria may cause fibrosis.

• 出版日期2012-8