[Effect of integrin-linked kinase on the growth of prostate cancer in nude mice].

Objective: To investigate the effect of the integrin-linked kinase (ILK) small interfering RNA (siRNA) on prostate cancer in nude mice by orthotopic injection of human cell line DU145.

Methods: The cultured human cell line DU145 was knocked down for ILK using a siRNA .Cellular ILK expression was quantified by RT-PCR and Western blot analysis. Moreover, cell attachment, invasiveness and microfilament dynamics assays were performed. Furthermore, the impact of the ILK siRNA on the prostate cancer was tested using a nude mice model in which prostate cancer was induced by orthotopic injection of human prostate cancer cell line DU145.Gross tumor volume of prostate in nude mice,cell differentiation,the state of apoptosis and proliferation were tested after 5 weeks of injection.

Results: The expression of ILK was suppressed significantly by siRNA, cellular mRNA and protein of ILK decreased 87% and 81% separately. The knockdown of ILK also induced the attachment and invasiveness of DU145 cell growing down. The tumor volume, cell differentiation, apoptosis index and proliferation index of prostate in nude mice of ILK siRNA orthotopic injection model were significantly smaller, better, increased and decreased separately than those in control group.

Conclusion: Targeting inhibition of ILK not only decreases attachment and invasiveness of human DU145 cells, but also suppresses the growth and development of prostate cancer of orthotopic injection human DU145 cell line model in nude mice.