Antitumour effects on human colorectal carcinomas cells by stable silencing of phospholipase C-gamma I with lentivirus-delivered siRNA

Background In most colorectal carcinomas, the level of phospholipase C （PLC）-gamma 1 expression is greatly elevated. Increased expression of PLC-gamma 1 may play an important role in colon carcinogenesis, but the mechanism is not well known. The aim of this study was to evaluate the role of PLC-gamma 1 in colon carcinogenesis by using recombinant lentivirus that stably suppressed the PLC-gamma 1 expression in human colorectal carcinoma LoVo cells. Methods Recombinant lentivirus producing PLC-gamma 1 siRNA were prepared. After LoVo cells were transduced by each lentivirus, stably transduced cells were selected by Blasticidin. The protein and mRNA expression of PLC-gamma 1 were examined by Western-blot and reverse transcription-polymerase chain reaction （RT-PCR） analysis, and the effects of the lentivirus on the cell adhesion, migration and apoptosis were analyzed. Results Stable LoVo cell line deficient in PLC-gamma 1, was established. Notably, PLC-gamma 1 was silenced without affecting the levels of other subtypes of PLC so that the role of PLC-gamma 1 in colon carcinogenesis could be examined Silencing of endogenous PLC-gamma 1 resulted in efficient inhibition of the adhesion and migration of LoVo cells in vitro and a great increase of 5-fluorouracil induced apoptosis （30%-40%） of LoVo cells. Conclusions PLC-gamma 1 may play an important role in metastasis and anti-apoptosis in human colorectal carcinomas.