Erschienen in:
01.10.2009 | Original Article
Pseudomonas aeruginosa: Mannose Sensitive Hemagglutinin Inhibits the Growth of Human Hepatocarcinoma Cells via Mannose-Mediated Apoptosis
verfasst von:
Zhenyuan Cao, Lijun Shi, Ying Li, Jinghua Wang, Dandan Wang, Guangyou Wang, Bo Sun, Lili Mu, Mingfei Yang, Hulun Li
Erschienen in:
Digestive Diseases and Sciences
|
Ausgabe 10/2009
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Abstract
A vaccine derived from the outer membrane proteins of the Gram-negative bacterium Pseudomonas aeruginosa has been shown to have immune modulatory properties. An inactivated mutant strain of P. aeruginosa with mannose sensitive hemagglutinin fimbria (PA-MSHA) has been used for adjuvant therapy for malignant cancer. In this study, the growth of human hepatocellular carcinoma Hep G2 and BEL-7402 cells is inhibited by PA-MSHA, but not by mannose-cleaved PA-MSHA. PA-MSHA-treated cells arrested in the S phase of the cell cycle and underwent apoptosis. We hypothesize that apoptosis induced by treatment of Hep G2 and BEL-7402 cells with PA-MSHA is mediated by the mannose residues of PA-MSHA and is propagated through the extrinsic apoptosis pathway directly through caspase-8. These data provide mechanistic details for the potential application of PA-MSHA-based treatment of hepatocellular carcinoma.