Role of PpⅨ-based photodynamic therapy in promoting the damage and apoptosis of colorectal cancer cell and its mechanisms / 中南大学学报(医学版)

Objective:To explore the effects of protoporphyrin Ⅸ (PpⅨ)-mediated photodynamic therapy (PDT) on induction of apoptosis and death in colon cancer cell and the underlying mechanisms.Methods:The cell killing effect of PDT on HCT116 cell was determined by cell counting kit (CCK).The cells were divided into a control group,a single light group,a single PpⅨ group,and a PDT group.Hoechst 33342 and flow cytometry was used to assess the cell apoptosis.Western blot was employed to analyze the expressions ofbd-2,bax,and caspase-3.Reactive oxygen species (ROS) was detected by flow cytometry.Results:The viability of HCT116 cell was decreased gradually with the increase of irradiation dose (P<0.05).Compared to the other 3 groups,ROS production,the number of apoptotic cells and the protein expressions ofbax and caspase-3 in PDT group increased,while bcl-2 expression was decreased (P<0.05).Conclusion:PpⅨ-mediated PDT can enhance the apoptosis in HCT116 cell,which may be related to mitochondrial apoptosis pathway.

Clinical assay of renin-angiotensin-aldosterone system,endothelin and nitric oxide in renovacular hypentension and adrenocorticoadenoma / 中国基层医药

Objective To investigate the roles of renin-angiotens in system(RAS)and aldosterone(ALD),endothelin(ET),nitricoxide(NO)in patients with renal hypertension(40 cases)and adrenocorticoadenomas(35 cases),35 normal subjects were included in the study as controls.Methods Radioimmunoassay(RIA)was used to de termine the plasma concentrations of the renin,angiorensin Ⅱ(AⅡ),aldosterone,ET in the abovecases.Enzymicas say was adopted to examine the plasma concentration of the nitricoxidesynthase(NOS).Results TIhe plasma concentrations of renin,angiotennsin Ⅱ,aldosterone,endothefin in the patients with renal hypertension were significantly higher than those in the control group(P＜0.01)except with the concentration of NOS,which were lower than that in controls(P＜0.05);the plasma concentrations of the ALD,ET,in the patients with adrenocorti-caladenoma were higher that those in controls(P＜0.01)but renin and A Ⅱ were lower(P＜0.05).Conclusion Determination of the plasma renin,angiotensionⅡ,aldosterone and NO might be able diagnose renal hypertension and adrenocorti coadenoma earlier.