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Objective To investigate the significance of the expression of phosphatidic acid phosphatase type 2 domain containing 1A(PPAPDC1A) in human colorectal cancer cell lines.Methods The high metastatic potential cells LOVO,SW620 and low metastatic potential cells SW480,RKO,HCT116 and DLD-1 were cultured,the expression of PPAPDC1A mRNA and protein in different colorectal cancer cells in logarithmic growth period was detected by real-time quantitative polymerase chain reaction and Western blot.Results There were significant differences in the expressions of PPAPDC1A mRNA and protein among the six human colorectal cancer cells (F =41.213,344.1 16;P ＜ 0.05).The expression of PPAPDC1 A mRNA and protein in highly metastatic potential cells LOVO and SW620 was significantly higher than that in DLD-1,HCT116,RKO and SW480 cells (P ＜0.05).The expression of PPAPDC1A protein in LOVO cells with high metastatic potential was significantly higher than that in SW620 cells(P ＜ 0.05).The expression of PPAPDC1A protein in DLD-1 cells was significantly higher than that in HCT116,RKO and SW480 cells (P ＜0.05).The expression of PPAPDC1 A protein in HCT116 cells with low metastatic potential was significantly higher than that in RKO and SW480 cells (P ＜ 0.05).The expression of PPAPDC1 A protein in RKO cells was significantly higher than that in SW480 cells (P ＜ 0.05).There was no significant difference in the expression of PPAPDC1A mRNA between LOVO and SW620 cells (P ＜ 0.05).There was no significant difference in the expression of PPAPDC1A mRNA between SW480,RKO,HCT116 and DLD-1 cells (P＜ 0.05).Conclusion PPAPDC1A expresses differentially in colorectal cancer cell lines,which may be involved in the invasion and metastasis of colorectal cancer.
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<p><b>AIM</b>To investigate the role of nuclear factor-kappaB in apoptosis pathway of HUVEC.</p><p><b>METHODS</b>The cell lines of HUVEC cultured in vitro were divided into three groups: normal control group, Ang II group, and Gliotoxin group. We investigated the effects of Ang II (0.01 micromol/L, 0.1 micromol/L, 1 micromol/L and 10 micromol/L) on the viability of HUVEC with modified MTT. Then agarose gel electrophoresis and flow cytometry were applied to detect the apoptosis of HUVEC. Finally, the nuclear translocation of NF-kappaB subunit p65 was evaluated by immunocytochemistry.</p><p><b>RESULTS</b>The viability of HUVEC decreased significantly after incubated with 10 micromol/L Ang II for 24 hours. The results of DNA agarose gel and flow cytometry showed that 10 micromol/L Ang II induced the apoptosis of HUVEC, and the apoptosis rate was significantlyhigher than normal control group (P < 0.05). 0.1 mg/L Gliotoxin antagonized this effect of Ang II. The results of immunocytochemistry suggested that NF-kappaB was activated in HUVEC induced by 10 micromol/L Ang II. In contrast, Gliotoxin inhibited the activation of NF-kappaB in HUVEC induced by Ang II.</p><p><b>CONCLUSION</b>(1) Ang II can induce the apoptosis of HUVEC, while the inhibitor of NF-kappaB, Gliotoxin, can antagonize the effect of Ang II. (2) NF-kappaB may play an important role in apoptosis pathway of HUVEC induced by Ang II.</p>