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Nakamuta, M. et al.

Nakamuta, Higashi, Kohjima, Fukushima, Ohta, Kotoh, Kobayashi, Enjoji,

Epigallocatechin-3-gallate, a polyphenol component of green tea, suppresses both collagen production and collagenase activity in hepatic stellate cells.

Catechins such as epigallocatechin-3-gallate (EGCG), epicatechin-3-gallate (ECG), and epigallocatechin (EGC) are polyphenol components of green tea. EGCG is the major component and has been reported to possess a wide range of biological properties including anti-fibrogenic activity. In hepatic fibrosis, activated hepatic stellate cells (HSCs) play a central role. In this study, we investigated the effect of catechins, including EGCG, on collagen production and collagenase activity in rat primary HSCs and activated human HSC-derived TWNT-4 cells. EGCG (50 microM) suppressed type I collagen production in rat HSCs more than ECG (50 microM) did; however, EGC (50 microM) did not show suppressive effects. EGCG also inhibited both collagen production and collagenase activity (active matrix metalloproteinase-1 [MMP-1]) in a dose-dependent manner, but did not affect the tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) production in TWNT-4 cells. Real-time PCR unexpectedly revealed that EGCG enhanced the transcription of type I collagen and TIMP-1, but did not affect the transcription of alpha-smooth muscle actin (alpha-SMA), and reduced the transcription MMP-1 in TWNT-4 cells. These findings demonstrated that EGCG inhibited collagen production regardless of enhanced collagen transcription and suppressed collagenase activity, and suggested that EGCG might have therapeutic potential for liver fibrosis.[1]

References

Epigallocatechin-3-gallate, a polyphenol component of green tea, suppresses both collagen production and collagenase activity in hepatic stellate cells. Nakamuta, M., Higashi, N., Kohjima, M., Fukushima, M., Ohta, S., Kotoh, K., Kobayashi, N., Enjoji, M. Int. J. Mol. Med. (2005) [Pubmed]

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