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[en] Objective: To study the significance and the effect of transcatheter arterial chemoembolization (TACE) on MMP-2 and TIMP-2 expressions. Methods: Forty-seven pathologically verified HCC patients included surgical resection alone 25 cases and second stage surgical resection after chemoembolization 22 cases. Immunohistochemical staining for MMP-2 and TIMP-2 expression were performed in all specimens. Results: There was significant difference in MMP-2 expressions between patients with or without metastasis (χ2=6.518, P<0.05) and complete capsule (χ2=6.038, P<0.05). MMP-2 expression was even lower and TIMP-2 expression was even higher in TACE group than surgical resection group (P<0.05); a significant negative correlation was observed between the expressions of MMP-2 and TIMP-2(r=-0.392, P < 0.05). Conclusion: HCC metastatic potentiality is correlative with MMP-2 and TIMP-2 expressions and chemoembolization is helpful for restraining the invasive and metastatic potentialities of HCC. (authors)
[en] The effects of nine intra- and extracellular proteinases and six proteinaseinhibitors on the repair of potentially lethal damage (PLDR) induced by γ-rays in plateau-phase V79 cells were examined, these agents were found to and modify PLDR activity. A stimulatory effect of PLDR was seen with calf liver neutral proteinase, to a lesser extent, with inhibitor pepstatin A. Other proteinases belonging to serine, cysteine and aspartic superfamilies, as well as proteinase inhibitors, inhibited PLDR to different degrees. The effects of some of these agents, present during the PLDR period, on the rate of tritiated thymidine incorporation into the acid-insoluble cell fraction was examined. They can modify DNA synthesis of cells subcultured from plateau phase for colony-forming ability assessment. There is no clear evidence that effects observed are entirely attributed to alteration of cellular proliferative processes. It seems more likely that many serine and cysteine proteinases and their inhibitors can adversely affect the PLDR process by modulating the activity of proteinase(s) and other enzymes involved more directly in PLDR because of interrelationships of the entire intracellular proteinase system. (author)
[en] Autophagy and apoptosis are common responses to pathological damage in the process of Parkinson's disease (PD), and lysosome dysfunction may contribute to the etiology of PD's neurodegenerative process. In this study, we demonstrated that the neurotoxin 6-hydroxydopamine (6-OHDA) increased autophagy in SH-SY5Y cells, as determined by detection of the lysosome marker lysosomal-associated membrane protein1, the autophagy protein light chain 3 (LC3)-II and the autophagy substrate P62 protein. Meanwhile, autophagy repression with 3-methyladenine accelerated the activation of caspase-3 and PARP and aggravated the cell apoptotic death induced by 6-OHDA. Furthermore, we found that 6-OHDA treatment resulted in a transient increase in the intracellular and nuclear expression of cathepsin L (CTSL). The CTSL inhibitor, Z-FY-CHO, could promote autophagy, decrease accumulation of P62, and block activation of caspase-3 and PARP. Taken together, these results suggest that activation of autophagy may primarily be a protective process in SH-SY5Y cell death induced by 6-OHDA, and the nuclear translocation of CTSL could enhance the cell apoptotic cascade via disturbing autophagy-apoptotic systems in SH-SY5Y cells. Our findings highlight the potential role of CTSL in the cross talk between autophagy and apoptosis, which might be considered a therapeutic strategy for treatment of pathologic conditions associated with neurodegeneration. - Highlights: • Inhibition of autophagy aggravated the cell apoptotic death in SH-SY5Y cells. • Activation of cathepsin L impaired the autophagy pathway. • Activation of cathepsin L enhanced the cell apoptotic cascade. • Cathepsin L involves in the cross talk between autophagy and apoptosis.