Feng, Y

LI, S

TAN, HY

Tsang, CM

Tsao, GSW

Wang, N

Wang, X

International Journal of Molecular Sciences

PubMed

The aim of this study is to explore the underlying mechanism on berberine-induced Cyclin D1 degradation in human hepatic carcinoma. We observed that berberine could suppress both in vitro and in vivo expression of Cyclin D1 in hepatoma cells. Berberine exhibits dose- and time-dependent inhibition on Cyclin D1 expression in human hepatoma cell HepG2. Berberine increases the phosphorylation of Cyclin D1 at Thr286 site and potentiates Cyclin D1 nuclear export to cytoplasm for proteasomal degradation. In addition, berberine recruits the Skp, Cullin, F-box containing complex-β-Transducin Repeat Containing Protein (SCFβ-TrCP) complex to facilitate Cyclin D1 ubiquitin-proteasome dependent proteolysis. Knockdown of β-TrCP blocks Cyclin D1 turnover induced by berberine; blocking the protein degradation induced by berberine in HepG2 cells increases tumor cell resistance to berberine. Our results shed light on berberine′s potential as an anti-tumor agent for clinical cancer therapy

Ning Wang

Xuanbin Wang

Hor-Yue Tan

Sha Li

Chi Man Tsang

Sai-Wah Tsao

Yibin Feng

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Berberine Suppresses Cyclin D1 Expression through Proteasomal Degradation in Human Hepatoma Cells

HKU Scholars Hub

Multidisciplinary Digital Publishing Institute

http://hub.hku.hk/bitstream/10722/238615/1/content.pdf

Berberine Suppresses Cyclin D1 Expression through Proteasomal Degradation in Human Hepatoma Cells

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Directory of Open Access Journals

HKU Scholars Hub

Multidisciplinary Digital Publishing Institute