AIM:To determine the mechanism of the radiationinduced biological effects of 125I seeds on pancreatic carcinoma cells in vitro.METHODS:SW1990 and PANC-1 pancreatic cancer cell lines were cultured in DMEM in a suitable...AIM:To determine the mechanism of the radiationinduced biological effects of 125I seeds on pancreatic carcinoma cells in vitro.METHODS:SW1990 and PANC-1 pancreatic cancer cell lines were cultured in DMEM in a suitable environment.Gray’s model of iodine-125(125I)seed irradiation was used.In vitro,exponential phase SW1990,and PANC-1cells were exposed to 0,2,4,6,and 8 Gy using 125I radioactive seeds,with an initial dose rate of 12.13c Gy/h.A clonogenic survival experiment was performed to observe the ability of the cells to maintain their clonogenic capacity and to form colonies.Cell-cycle and apoptosis analyses were conducted to detect the apoptosis percentage in the SW1990 and PANC-1 cells.DNA synthesis was measured via a tritiated thymidine(3H-Td R)incorporation experiment.After continuous low-dose-rate irradiation with 125I radioactive seeds,the survival fractions at 2 Gy(SF2),percentage apoptosis,and cell cycle phases of the SW1990 and PANC-1 pancreatic cancer cell lines were calculated and compared.RESULTS:The survival fractions of the PANC-1 andSW1990 cells irradiated with 125I seeds decreased exponentially as the dose increased.No significant difference in SF2 was observed between SW1990 and PANC-1 cells(0.766±0.063 vs 0.729±0.045,P<0.05).The 125I seeds induced a higher percentage of apoptosis than that observed in the control in both the SW1990and PANC-1 cells.The rate of apoptosis increased with increasing radiation dosage.The percentage of apoptosis was slightly higher in the SW1990 cells than in the PANC-1 cells.Dose-dependent G2/M cellcycle arrest was observed after 125I seed irradiation,with a peak value at 6 Gy.As the dose increased,the percentage of G2/M cell cycle arrest increased in both cell lines,whereas the rate of DNA incorporation decreased.In the 3H-Td R incorporation experiment,the dosimetry results of both the SW1990 and PANC-1cells decreased as the radiation dose increased,with a minimum at 6 Gy.There were no significant differences in the dosimetry results of the two cell lines when t展开更多
BACKGROUND Oral cancer(OC)is the most common malignant tumor in the oral cavity,and is mainly seen in middle-aged and elderly men.At present,OC is mainly treated clinically by surgery or combined with radiotherapy and...BACKGROUND Oral cancer(OC)is the most common malignant tumor in the oral cavity,and is mainly seen in middle-aged and elderly men.At present,OC is mainly treated clinically by surgery or combined with radiotherapy and chemotherapy;but recently,more and more studies have shown that the stress trauma caused by surgery and the side effects of radiotherapy and chemotherapy seriously affect the prognosis of patients.AIM To determine the significance of 125I radioactive seed implantation on growth differentiation factor 11(GDF11)and programmed death receptor-1(PD-1)during treatment of OC.METHODS A total of 184 OC patients admitted to The Second Affiliated Hospital of Jiamusi University from May 2015 to May 2017 were selected as the research subjects for prospective analysis.Of these patients,89 who received 125I radioactive seed implantation therapy were regarded as the research group(RG)and 95 patients who received surgical treatment were regarded as the control group(CG).The clinical efficacy,incidence of adverse reactions and changes in GDF11 and PD-1 before treatment(T0),2 wk after treatment(T1),4 wk after treatment(T2)and 6 wk after treatment(T3)were compared between the two groups.RESULTS The efficacy and recurrence rate in the RG were better than those in the CG(P<0.05),while the incidence of adverse reactions and survival rate were not different.There was no difference in GDF11 and PD-1 between the two groups at T0 and T1,but these factors were lower in the RG than in the CG at T2 and T3(P<0.05).Using receiver operating characteristic(ROC)curve analysis,GDF11 and PD-1 had good predictive value for efficacy and recurrence(P<0.001).CONCLUSION 125I radioactive seed implantation has clinical efficacy and can reduce the recurrence rate in patients with OC.This therapy has marked potential in clinical application.The detection of GDF11 and PD-1 in patients during treatment showed good predictive value for treatment efficacy and recurrence in OC patients,and may be potential targets for future OC treatment.展开更多
Excessive radiation exposure may lead to edema of the spinal cord and deterioration of the nervous system. Magnetic resonance imaging can be used to judge and assess the extent of edema and to evaluate pathological ch...Excessive radiation exposure may lead to edema of the spinal cord and deterioration of the nervous system. Magnetic resonance imaging can be used to judge and assess the extent of edema and to evaluate pathological changes and thus may be used for the evaluation of spinal cord injuries caused by radiation therapy. Radioactive ^125I seeds to irradiate 90% of the spinal cord tissue at doses of 40–100 Gy （D90） were implanted in rabbits at T10 to induce radiation injury, and we evaluated their safety for use in the spinal cord. Diffusion tensor imaging showed that with increased D90, the apparent diffusion coefficient and fractional anisotropy values were increased. Moreover, pathological damage of neurons and microvessels in the gray matter and white matter was aggravated. At 2 months after implantation, obvious pathological injury was visible in the spinal cords of each group. Magnetic resonance diffusion tensor imaging revealed the radiation injury to the spinal cord, and we quantified the degree of spinal cord injury through apparent diffusion coefficient and fractional anisotropy.展开更多
基金Supported by Natural Science Foundation of China,No.81271682(partly)grants from Science and Technology Commission of Shanghai Municipality,No.11JC1407400(partly)+1 种基金the project of Luwan District Science and Technology Commission of Shanghai,No.LKW1104(partly)the project of Medical Key Specialty of Shanghai Municipality,No.ZK2012A20(partly)
文摘AIM:To determine the mechanism of the radiationinduced biological effects of 125I seeds on pancreatic carcinoma cells in vitro.METHODS:SW1990 and PANC-1 pancreatic cancer cell lines were cultured in DMEM in a suitable environment.Gray’s model of iodine-125(125I)seed irradiation was used.In vitro,exponential phase SW1990,and PANC-1cells were exposed to 0,2,4,6,and 8 Gy using 125I radioactive seeds,with an initial dose rate of 12.13c Gy/h.A clonogenic survival experiment was performed to observe the ability of the cells to maintain their clonogenic capacity and to form colonies.Cell-cycle and apoptosis analyses were conducted to detect the apoptosis percentage in the SW1990 and PANC-1 cells.DNA synthesis was measured via a tritiated thymidine(3H-Td R)incorporation experiment.After continuous low-dose-rate irradiation with 125I radioactive seeds,the survival fractions at 2 Gy(SF2),percentage apoptosis,and cell cycle phases of the SW1990 and PANC-1 pancreatic cancer cell lines were calculated and compared.RESULTS:The survival fractions of the PANC-1 andSW1990 cells irradiated with 125I seeds decreased exponentially as the dose increased.No significant difference in SF2 was observed between SW1990 and PANC-1 cells(0.766±0.063 vs 0.729±0.045,P<0.05).The 125I seeds induced a higher percentage of apoptosis than that observed in the control in both the SW1990and PANC-1 cells.The rate of apoptosis increased with increasing radiation dosage.The percentage of apoptosis was slightly higher in the SW1990 cells than in the PANC-1 cells.Dose-dependent G2/M cellcycle arrest was observed after 125I seed irradiation,with a peak value at 6 Gy.As the dose increased,the percentage of G2/M cell cycle arrest increased in both cell lines,whereas the rate of DNA incorporation decreased.In the 3H-Td R incorporation experiment,the dosimetry results of both the SW1990 and PANC-1cells decreased as the radiation dose increased,with a minimum at 6 Gy.There were no significant differences in the dosimetry results of the two cell lines when t
基金Supported by Heilongjiang Provincial Health and Family Planning Commission Research Project,No.2017-413
文摘BACKGROUND Oral cancer(OC)is the most common malignant tumor in the oral cavity,and is mainly seen in middle-aged and elderly men.At present,OC is mainly treated clinically by surgery or combined with radiotherapy and chemotherapy;but recently,more and more studies have shown that the stress trauma caused by surgery and the side effects of radiotherapy and chemotherapy seriously affect the prognosis of patients.AIM To determine the significance of 125I radioactive seed implantation on growth differentiation factor 11(GDF11)and programmed death receptor-1(PD-1)during treatment of OC.METHODS A total of 184 OC patients admitted to The Second Affiliated Hospital of Jiamusi University from May 2015 to May 2017 were selected as the research subjects for prospective analysis.Of these patients,89 who received 125I radioactive seed implantation therapy were regarded as the research group(RG)and 95 patients who received surgical treatment were regarded as the control group(CG).The clinical efficacy,incidence of adverse reactions and changes in GDF11 and PD-1 before treatment(T0),2 wk after treatment(T1),4 wk after treatment(T2)and 6 wk after treatment(T3)were compared between the two groups.RESULTS The efficacy and recurrence rate in the RG were better than those in the CG(P<0.05),while the incidence of adverse reactions and survival rate were not different.There was no difference in GDF11 and PD-1 between the two groups at T0 and T1,but these factors were lower in the RG than in the CG at T2 and T3(P<0.05).Using receiver operating characteristic(ROC)curve analysis,GDF11 and PD-1 had good predictive value for efficacy and recurrence(P<0.001).CONCLUSION 125I radioactive seed implantation has clinical efficacy and can reduce the recurrence rate in patients with OC.This therapy has marked potential in clinical application.The detection of GDF11 and PD-1 in patients during treatment showed good predictive value for treatment efficacy and recurrence in OC patients,and may be potential targets for future OC treatment.
基金supported by the Science and Technology Development Project Funds of Science and Technology Department of Jilin Province in China,No.20120724
文摘Excessive radiation exposure may lead to edema of the spinal cord and deterioration of the nervous system. Magnetic resonance imaging can be used to judge and assess the extent of edema and to evaluate pathological changes and thus may be used for the evaluation of spinal cord injuries caused by radiation therapy. Radioactive ^125I seeds to irradiate 90% of the spinal cord tissue at doses of 40–100 Gy （D90） were implanted in rabbits at T10 to induce radiation injury, and we evaluated their safety for use in the spinal cord. Diffusion tensor imaging showed that with increased D90, the apparent diffusion coefficient and fractional anisotropy values were increased. Moreover, pathological damage of neurons and microvessels in the gray matter and white matter was aggravated. At 2 months after implantation, obvious pathological injury was visible in the spinal cords of each group. Magnetic resonance diffusion tensor imaging revealed the radiation injury to the spinal cord, and we quantified the degree of spinal cord injury through apparent diffusion coefficient and fractional anisotropy.
