[The Inhibitory Effect and Mechanism of Human Umbilical Cord Mesenchymal Stem Cells on Prostate Cancer Metastasis].

OBJECTIVE: To test whether umbilical cord mesenchymal stem cells (UMSCs) can inhibit the growth and metastasis of prostate cancer cells, and to investigate the mechanism.

METHODS: The UMSCs from human umbilical cord tissue were isolate by explant technique. After being co-cultured the UMSCs with LNCaP and PC-3 cells for 24 h, 48 h and 72 h, LNCaP and PC-3 cells' proliferation were tested and the 72 h proliferation inhibitory rate (IR) was calculated. Transwell invasion assay was used to test the migration and invasion abilities of prostate cancer cells after being co-cultured with UMSCs for 48 h. The invasion IR were calculated. The expression of matrix metalloproteinases (MMP)-2, MMP-9, tissue inhibitor of metalloproteinase (TIMP)-1 and TIMP-2 in the 72 h co-culture supernatants were tested by MILLIPLEX®MAPmethod.

RESULTS: The proliferation of prostate cancer cells was inhibited after being co-cultured with UMSCs. The proliferation rate of LNCaP was lower than control group at 72 h (P<0.05), and the proliferation IR was 37.21%. The proliferation rate of PC-3 was lower than control group at 48 h and 72 h (P<0.05), and the proliferation IR was 31.27% at 72 h. Transwell invasion assays showed that co-culturing 48 h with UMSCs inhibited the invasive abilities of LNCaP and PC-3, and the invasion IR were 48.35% (LNCaP) and 46.91% (PC-3). Co-culturing 72 h, the expression of MMP-2 and MMP-9 were down-regulated (P<0.05) and the secretion of TIMP-1 and TIMP-2 were up-regulated (P<0.05) compared with control group.

CONCLUSION: UMSCs can inhibit the proliferation and invasion abilities of prostate cancer cells by secreting TIMPs, the antagonist of MMPs, which suppressed the overexpression of MMPs.