Down-regulation of urokinase plasminogen activator and matrix metalloproteinases and up-regulation of their inhibitors by a novel nutrient mixture in human prostate cancer cell lines PC-3 and DU-145

作者：Roomi M W; Kalinovsky T; Rath M; Niedzwiecki A^*

来源：Oncology Reports, 2011, 26(6): 1407-1413.

DOI：10.3892/or.2011.1434

• nutrient mixture
• urokinase plasminogen activators
• matrix metalloproteinases-2
• matrix metalloproteinases-9
• tissue inhibitors of metalloproteinases
• prostate cancer
• PC-3
• DU-145

Strong clinical and experimental evidence shows that elevated levels of urokinase plasminogen activators (u-PA) and matrix metalloproteinases (MMPs) are associated with prostate cancer progression, metastasis and shortened survival in patients. MMP activities are regulated by specific tissue inhibitors of metalloproteinases (TIMPs). A nutrient mixture (NM) containing lysine, proline, ascorbic acid and green tea extract showed anticancer activity against a number of cancer cell lines. Our main objective was to study the effect of NM on the activity of u-PA, MMPs and their inhibitor TIMPs on human prostate cancer cell lines PC-3 and DU-145. Human prostate cancer cell lines PC-3 and DU-145 (ATCC) were grown in MEM media with 10% FBS and antibiotics in 24-well tissue culture plates. At near confluence, the cells were treated with NM at 0-1000 mu g/ml in triplicate at each concentration. Analysis of u-PA activity was carried out by fibrin zymography, MMPs by gelatinase zymography and TIMPs by reverse zymography. Both PC-3 and DU-145 prostate cancer cell lines demonstrated u-PA activity (subunits 1 and 2, corresponding to 35 and 33 kDa). Prostate cancer cell line PC-3 secretion of u-PA subunit I was decreased by 65% at NM 500 mu g/ml and subunit 2 by 100% at NM 50 mu g/ml. Prostate cancer cell line DU-145 secretion of u-PA subunit 1 was decreased by 97% at NM 500 mu g/ml and subunit 2 by 100% at NM 100 mu g/ml. Untreated PC-3 showed two bands for MMP-2 and MMP-9. NM inhibited their expression in a dose-dependent manner. The activity of MMP-2 and MMP-9 was significantly inhibited at 250 mu g/ml with total inhibition at 500 mu g/ml. DU-145 cells did not exhibit M MP activity. Activity of TIMPs was up-regulated in both prostate cancer cell lines in a dose-dependent manner. Minimum activity was expressed at 50 mu g/ml NM and maximum at 1000 mu g/ml. Correlation analyses revealed a positive correlation between u-PA and MMPs and a negative correlation between u-PA/MMPs and TIMPs. These results suggest NM as a potential anticancer agent since it targets invasive parameters of prostate cancer.

• 出版日期2011-12