AIM: To study the effects of chromic-P32 phosphate (32p colloids) interstitial administration in Pc-3 implanted pancreatic carcinoma, and investigate its anticancer mechanism.METHODS: Ninety-eight tumor bearing nude m...AIM: To study the effects of chromic-P32 phosphate (32p colloids) interstitial administration in Pc-3 implanted pancreatic carcinoma, and investigate its anticancer mechanism.METHODS: Ninety-eight tumor bearing nude mice werekilled at different time points after the injection of 32Pcolloids to the tumor core with observed radioactivity. The light microscopy, transmission electron microscopy (TEM) and immuno-histochemistry and flow cytometry were used to study the rates of tumor cell necrosis, proliferating cell nuclear antigen index, the micro vessel density (MVD). The changes of the biological response to the lymphatic transported 32p colloids in the inguinal lymph node (ILN) were dynamically observed, and the percentage of tumor cell apoptosis, and Apo2.7, caspase-3, Bcl-2, Baxrelated gene expression were observed too.RESULTS: The half-life of effective medication is 13 dafter injection of 32P colloids to the tumor stroma, in 1-6groups, the tumor cell necrosis rates were 20%, 45%,65%, 70%, 95% and 4%, respectively (F= 4.14-105.36, P＜0.01). MVD were 38.5±4.0, 28.0±2.9, 17.0±2.9, 8.8±1.5,5.7±2.3 and 65.0±5.2 (t= 11.9-26.1, P＜0.01), respectively.Under TEM fairly differentiated Pc-3 cells were found. Thirty days after medication, tumors were shrunk and dried with scabs detached, and those in control group increased in size prominently with plenty of hypodermic blood vessels. In all animals the ILN were enlarged but in medicated animals they appeared later and smaller than those in control group. The extent of irradiative injury in ILN was positively correlated to the dosage of medication. Typical tumor cell apoptosis could be found under TEM inanimals with intra-tumoral injection of low dosed 32P colloids. The peak of apoptosis occurred in 2.96 MBq group and 24 h after irradiation. In the course of irradiationinduced apoptosis, the value of Bcl-2/Bax was down regulated; Apo2.7 and caspase-3 protein expression were prominently increased dose dependently. CONCLUSION: 32p colloids intra-tumor injection having prominent anticancer effectiveness may reveal the ability of promoting cell differentiation. The low dose 32P colloids may induce human pancreatic carcinoma Pc-3 implanted tumor cell apoptosis; Apo2.7, caspase-3, Bcl-2 and Bax protein participated in regulating the process of irradiation induced cell apoptosis.展开更多
Little is known regarding the ability of protozoans to transfer phosphates and improve maize growth.The objective of this study was to determine whether Colpoda cucullus could improve the maize phosphorus(P) level by ...Little is known regarding the ability of protozoans to transfer phosphates and improve maize growth.The objective of this study was to determine whether Colpoda cucullus could improve the maize phosphorus(P) level by transferring phosphate.In this three-compartment root box study,the soil in the outer compartment was inoculated with the common ciliate,C.cucullus,together with the addition of either KH_(2)^(32)PO_(4),rock phosphate(RP),super phosphate(SP) or ammonium phosphate(AP),and then maize was grown in the inner compartment.The results showed that the maize plants grown in the soil inoculated with C.cucullus had much higher ^(32)P radioactivity than the control.Colpoda cucullus inoculation resulted in significant increases in dry matter by up to 25.07%,and nitrogen(N),P and potassium(K) absorption by 1–36%(P<0.05).Soil available P in the inner compartment of the root box was also enhanced by at least 30% due to the ciliate inoculation(P<0.05).It was therefore suggested that phosphates might be transported from the outer to inner compartments by the inoculated C.cucullus and then absorbed by the maize plant.展开更多
基金Supported by the Jiangsu Province Public Health Bureau Foundation,No. H200117, and Jiangsu Science Technology Foundation, No.2000004
文摘AIM: To study the effects of chromic-P32 phosphate (32p colloids) interstitial administration in Pc-3 implanted pancreatic carcinoma, and investigate its anticancer mechanism.METHODS: Ninety-eight tumor bearing nude mice werekilled at different time points after the injection of 32Pcolloids to the tumor core with observed radioactivity. The light microscopy, transmission electron microscopy (TEM) and immuno-histochemistry and flow cytometry were used to study the rates of tumor cell necrosis, proliferating cell nuclear antigen index, the micro vessel density (MVD). The changes of the biological response to the lymphatic transported 32p colloids in the inguinal lymph node (ILN) were dynamically observed, and the percentage of tumor cell apoptosis, and Apo2.7, caspase-3, Bcl-2, Baxrelated gene expression were observed too.RESULTS: The half-life of effective medication is 13 dafter injection of 32P colloids to the tumor stroma, in 1-6groups, the tumor cell necrosis rates were 20%, 45%,65%, 70%, 95% and 4%, respectively (F= 4.14-105.36, P＜0.01). MVD were 38.5±4.0, 28.0±2.9, 17.0±2.9, 8.8±1.5,5.7±2.3 and 65.0±5.2 (t= 11.9-26.1, P＜0.01), respectively.Under TEM fairly differentiated Pc-3 cells were found. Thirty days after medication, tumors were shrunk and dried with scabs detached, and those in control group increased in size prominently with plenty of hypodermic blood vessels. In all animals the ILN were enlarged but in medicated animals they appeared later and smaller than those in control group. The extent of irradiative injury in ILN was positively correlated to the dosage of medication. Typical tumor cell apoptosis could be found under TEM inanimals with intra-tumoral injection of low dosed 32P colloids. The peak of apoptosis occurred in 2.96 MBq group and 24 h after irradiation. In the course of irradiationinduced apoptosis, the value of Bcl-2/Bax was down regulated; Apo2.7 and caspase-3 protein expression were prominently increased dose dependently. CONCLUSION: 32p colloids intra-tumor injection having prominent anticancer effectiveness may reveal the ability of promoting cell differentiation. The low dose 32P colloids may induce human pancreatic carcinoma Pc-3 implanted tumor cell apoptosis; Apo2.7, caspase-3, Bcl-2 and Bax protein participated in regulating the process of irradiation induced cell apoptosis.
基金funded by the National Natural Science Foundation of China (41877059)。
文摘Little is known regarding the ability of protozoans to transfer phosphates and improve maize growth.The objective of this study was to determine whether Colpoda cucullus could improve the maize phosphorus(P) level by transferring phosphate.In this three-compartment root box study,the soil in the outer compartment was inoculated with the common ciliate,C.cucullus,together with the addition of either KH_(2)^(32)PO_(4),rock phosphate(RP),super phosphate(SP) or ammonium phosphate(AP),and then maize was grown in the inner compartment.The results showed that the maize plants grown in the soil inoculated with C.cucullus had much higher ^(32)P radioactivity than the control.Colpoda cucullus inoculation resulted in significant increases in dry matter by up to 25.07%,and nitrogen(N),P and potassium(K) absorption by 1–36%(P<0.05).Soil available P in the inner compartment of the root box was also enhanced by at least 30% due to the ciliate inoculation(P<0.05).It was therefore suggested that phosphates might be transported from the outer to inner compartments by the inoculated C.cucullus and then absorbed by the maize plant.
