Objective To study the antitumor effect of new photodynamic therapy (PDT) applying TMPyP4 combined with nucleolin silence on cervical cancer SiHa cells in vitro, and to explore an available combination treatment project for cervical cancer.Methods The SiHa Cells were divided into blank control group, RNAi group,PDT group and PDT-RNAi group.The proliferation activities of SiHa cells were assessed by Cell Counting Kit-8 (CCK8)assay.The apoptotic rates were measured by flow cytometry (FCM)with Annexin Ⅴ/PI staining. The invasiveness abilities were assessed by Transwell assay. Results Compared with blank control group, the inhibitory rates of growth of SiHa cells in RNAi group, PDT group and PDT-RNAi group were increased significantly (P<0.01);the inhibitory rates of growth of SiHa cells in PDT-RNAi group were higher than those in PDT group and RNAi group (P<0.05 ). The Q value was 1.27. Compared with blank control group, the apoptotic rates of SiHa cells in experiment groups were increased (P<0.05 ), and the late apoptotic rate in PDT-RNAi group was also increased;there were significant differences of the apoptotic rates between PDT-RNAi group and RNAi group, PDT group (P<0.05 ). Compared with blank control group, the cell invasiveness abilities of SiHa cells in experiment groups were decreased;there were significant differences of the invasiveness abilities of SiHa cells between PDT group and RNAi group (P<0.05).Conclusion New PDT shows a strong photodynamic effect on the SiHa cells,which can inhibit the proliferation and invasiveness and induce the apoptosis of SiHa cells invitro;nucleolin silence shows a good synergy effect to PDT.

Objective To explore the feasibility and application in quantifying the rabbit central nervous system by using magnetic resonance diffusion tensor imaging(DTI)sequences.Methods 12 normal New Zealand rabbits were used to scan the brain and spinal cord of rabbits by DTI sequence of 1.5T MR machine,and the normal apparent diffusion coefficient(ADC)and fractional anisotropy (FA)values were obtained in the different regions of the brain and every spinal segment of rabbits,to analyse the characteristics and regularity of numerical changes.Results The average ADC value in the brain of rabbits was (0.87±0.08)×10-3mm2/s,the average FA value was 0.23±0.09;the average ADC value in cervical spinal cord was (1.05±0.14)×10-3mm2/s,the average FA value was 0.55±0.08.The average ADC value in thoracic spinal cord was (1.14±0.12)×10-3mm2/s,and the average FA value was 0.57±0.06;the average ADC value in lumber spinal cord was (1.20±0.12)×10-3mm2/s,and the average FA value was 0.61±0.06.Conclusion FA average value in the brain is lower than that in spinal cord (P<0.001),the difference is related to the distribution of nerve fibers and physiological curvature of spine.ADC average value in the brain is lower than that in spinal cord(P<0.001),this is related to the volume of spinal canal and the peripheral structure of spinal cord.The difference of FA value in the brain and spinal cord is higher than ADC value.

Approximately 25%of cancers worldwide are related to obesity and sedentary lifestyle.Changing behavior(exer-cise)may be a cost-effective means of prevention and treatment.Studies have found that exercise plays an important role in reducing cancer risk,inhibiting tumor growth,improving cancer-related quality of life,and improving the effectiveness of treatment.However,this protection mechanism is largely unclear.Clarifying the mechanism of action is essential to fully exploit the potential of exercise therapy,this article reviews the possible mechanisms for exercise to reduce the risk of cancer.