Résumé
Objective To investigate the effect of CaMK Ⅱ expression on apoptosis of rat hepatocytes BRL-3A.Methods Rat BRL-3A cells were stable passage were cultured.The CaMK Ⅱ γ protein (LV-CaMK Ⅱ γ group) and CaMK Ⅱ γshRNA (shRNA group) lentiviral expression systems were constructed.The corresponding blank vectors (LV-NC group and shRNA-NC group) and normal saline (CON group) were perfused into the control groups.The expression levels of CaMK Ⅱ,Cyt C and MF proteins were detected by Western blotting,and the apoptosis rate of BRL-3A cells was measured by Tunel method.Results The protein expression of CaMK Ⅱ,Cyt C and AIF in LV-CaMK Ⅱ γ group was significantly higher than that in CON group (P＜0.05).The protein expression of CaMK Ⅱ,Cyt C and AIF in shRNA group was significantly lower than that in CON group (P＜ 0.05).There was no significant difference among CON group,LV-NC group and shRNA-NC group (P＞0.05).At the same time point,the apoptosis rate of hepatocytes in LV-CaMK Ⅱ γ group was significantly higher than that in CON group (P＜0.05).At the same time point,the apoptosis rate of hepatocytes in shRNA group was significantly higher than in CON group (P＜0.05).There was no significant difference in the apoptosis of hepatocytes among CON group,LV-NC group and shRNA-NC group (P＞0.05).Conclusion The specific CaMK Ⅱ signaling pathway can inhibit the apoptosis of BRL-3A cells,while the enhanced CaMK Ⅱ signaling pathway promotes the apoptosis of BRL-3A cells.
Résumé
This is a review of the progress in the study on auditory event-related potentials (ERP) of novel events. Several cognitive problems about the novelty ERP response on brain and the experiment methods are introduced. The mismatch negative potential (MMN) reflects the detection of deviant events, and MMN is related with the novelty P3. Familiarity and attention influence the novelty ERP response. Experiments results showed that the amplitude of ERPs in the frontal area was reduced with the enhancement of familiarity, while that in the parietal area had little change. Attention was helpful in increasing the amplitude of ERPs, and could make the corresponding brain area active. The functional significance of the response of ERP was discussed also.