氧化苦参碱对SW1990细胞MMP-2表达的抑制作用及对细胞侵袭力的影响

Effect of matrine on Hedgehog signaling pathway, cell proliferation and apoptosis in pancreatic carcinoma CFPAC-1 cells

AIM: To assess the effect of matrine on the proliferation and apoptosis of human pancreatic carcinoma CFPAC-1 cells and the potential molecular mechanism.

METHODS: MTT assay was used to detect the inhibitory effect of matrine on the proliferative rate of CFPAC-1 cells. Flow cytometry was performed to evaluate cell apoptosis. Western blot was applied to determine the expression levels of Hedgehog signaling pathway molecules such as Ptch, Smo, Gli-l and Bcl-1.

RESULTS: Matrine treatment dose- and time-dependently suppressed proliferation of CFPAC-1 cells (P < 0.05). IC₅₀ of matrine at 24 h was 1.266 mg/mL. Compared with control cells, treatment with matrine at a concentration of 0.25, 0.50, 1.00, 2.00, or 4.00 mg/mL for 24 h significantly increased cell apoptosis, and the apoptosis rates were 8.2367% ± 1.685%, 11.3867% ± 0.4652%, 13.6167% ± 0.5785%, 17.0433% ± 0.72501%, 23.8700% ± 3.31107% and 46.1333% ± 1.61398%, respectively (P < 0.05). There was a significant difference in cell apoptosis between matrine treated groups (P < 0.05) except for the comparison between the concentrations of 0.25 mg/mL and 0.50 mg/mL. Western blot analysis indicated that compared with control cells, protein expression of Bcl-2, Gli-l, Ptch and Smo was significantly decreased in CFPAC-1 cells treated with 1 mg/mL matrine for 24 h (F = 15.557, 8.745, 24.386, 12.768, P < 0.05).

CONCLUSION: Matrine can effectively inhibit proliferation and induce apoptosis of human pancreatic carcinoma CFPAC-1 cells, via mechanisms possibly involving the Hedgehog signal pathway and Bcl-2.

Effect of fluid shear stress on activation of hepatic stellate cells and expression of α-SMA, collogen-Ⅰ, collogen-Ⅲ, MMP-2, and MMP-9

AIM: To investigate the effects of different types of fluid shear stress on the activation of hepatic stellate cells-T6 (HSC-T6) and expression of α-SMA, collogen-Ⅰ, collogen-Ⅲ, MMP-2, and MMP-9.

METHODS: HSC-T6 cells were seeded on slides precoated with rat tail collagen and exposed to different types of fluid shear stress (6, 12, 20 dyn/cm²) for 3 h, and static cells served as controls. The gene expression of α-SMA, collogen-Ⅰ, collogen-Ⅲ, MMP-2 and MMP-9 was assayed by real-time RT-PCR. Intracellular α-SMA protein was analyzed by FACS.

RESULTS: After treatment by fluid shear stress, the expression of α-SMA and collogen-Ⅲ was lower in the low shear stress (6 dyn/cm²) group than that in the control group. However, the expression of α-SMA was higher in the moderate (12 dyn/cm²) and high (20 dyn/cm²) shear stress groups than that in the control group, and the expression of collogen-Ⅲ was higher in the high shear stress group than that in the control group. There was no significant difference in the expression of collogen-Ⅰ among different fluid shear stress groups. The expression of MMP-2 was higher that in three fluid shear stress groups than in the control group.

CONCLUSION: High fluid shear stress can lead to the activation of HSC-T6 cells and promote the mRNA expression of α-SMA, collogen-Ⅲ and MMP-2.