To investigate the inducement of cytotoxic T lym phocytes(CTL s) by antigen peptides m ixture from different leukemia cells and the cross- reaction of the m ixtures from different cell lines,antigen peptides m ixtur...To investigate the inducement of cytotoxic T lym phocytes(CTL s) by antigen peptides m ixture from different leukemia cells and the cross- reaction of the m ixtures from different cell lines,antigen peptides m ixtures were prepared from different leukemia cell lines respectively and then bound with Hsp70 in vitro.Activation and proliferation of PBMC were observed after stim u- lation with different Hsp70 - peptide complexes.The ratio of CD8+ in proliferative cells was ana- lyzed by flow cytometry.The cytotoxicity of the activated PBMC to different target cells was as- sayed.The results showed that the antigen peptides from different leukemia cell lines,bound with Hsp70 ,could activate PBMC effectively,and stimulate the activated PBMC to proliferate.The proliferative PBMC had specific cytotoxicity to corresponding leukem ia cells.CD8+ cells,account- ing for a high proportion in proliferative cells,had a specific cytotoxicity to leukemia cells from which antigen peptides were prepared,suggesting that these CD8+ cells were CTL s specific to leukemia cells.CTL s activated by Hut78- peptides or Molt4 - peptides had a significantly stronger cytotoxicity to Hut78cells,Molt4 cells and Jurkat cells than that of CTL s activated by HL - 6 0 - peptides(P<0 .0 5 ) .And the cytotoxicity of CTL s activated by Hut78/ Molt4 - peptides to Jurkat cells was significantly stronger than that of CTL s activated by either Hut78- peptides or Molt4 - peptides alone(P<0 .0 5 ) .It is concluded that antigen peptides m ixtures from leukem ia cells can induce specific antitumor CTL s.There exists cross- reactivity among antigen peptides m ixtures from different cell lines of the sam e type leukemia and more cross- reactive antigen peptides could be obtained from m ore cell lines,suggesting that antigen peptides m ixture with broad antigenic spectrum could be prepared by using multiple leukemia cell lines.展开更多
基金Thisprojectwassupported by a grant from the NationalNaturalScienceFoundationofChina(No.39970322)andTrans-CenturyTrainingProgramFoundation for Talent un-der the supervision of the Ministry of Education of China
文摘To investigate the inducement of cytotoxic T lym phocytes(CTL s) by antigen peptides m ixture from different leukemia cells and the cross- reaction of the m ixtures from different cell lines,antigen peptides m ixtures were prepared from different leukemia cell lines respectively and then bound with Hsp70 in vitro.Activation and proliferation of PBMC were observed after stim u- lation with different Hsp70 - peptide complexes.The ratio of CD8+ in proliferative cells was ana- lyzed by flow cytometry.The cytotoxicity of the activated PBMC to different target cells was as- sayed.The results showed that the antigen peptides from different leukemia cell lines,bound with Hsp70 ,could activate PBMC effectively,and stimulate the activated PBMC to proliferate.The proliferative PBMC had specific cytotoxicity to corresponding leukem ia cells.CD8+ cells,account- ing for a high proportion in proliferative cells,had a specific cytotoxicity to leukemia cells from which antigen peptides were prepared,suggesting that these CD8+ cells were CTL s specific to leukemia cells.CTL s activated by Hut78- peptides or Molt4 - peptides had a significantly stronger cytotoxicity to Hut78cells,Molt4 cells and Jurkat cells than that of CTL s activated by HL - 6 0 - peptides(P<0 .0 5 ) .And the cytotoxicity of CTL s activated by Hut78/ Molt4 - peptides to Jurkat cells was significantly stronger than that of CTL s activated by either Hut78- peptides or Molt4 - peptides alone(P<0 .0 5 ) .It is concluded that antigen peptides m ixtures from leukem ia cells can induce specific antitumor CTL s.There exists cross- reactivity among antigen peptides m ixtures from different cell lines of the sam e type leukemia and more cross- reactive antigen peptides could be obtained from m ore cell lines,suggesting that antigen peptides m ixture with broad antigenic spectrum could be prepared by using multiple leukemia cell lines.
