ABSTRACT
Objective@#To observe the changes of PD-1 expression, mRNA level and cytotoxic activity of CD19 CAR-T cells during the culture process of CAR-T cells.@*Methods@#The peripheral blood T cells of 6 lymphoma patients with high expression of PD-1 and 6 healthy volunteers were the source of CAR-T cells. The expression of PD-1 was analyzed by flow cytometry. The mRNA level of PD-1 was analyzed by PCR. The cell proliferation was analyzed by CCK-8 assay. The cytotoxicity was analyzed by LDH assay.@*Results@#①The transfection efficiency of high PD-1 expression T cells and healthy volunteer T cells were as the same (P>0.05) . ②The cell proliferation capacity of CD19 CAR-T cells from high PD-1 expression T cells or healthy volunteer T cells, with or without PD-1 inhibitor were as the same (P>0.05) . ③The cytotoxicity to lymphoma cells of high PD-1 expression T cells and CAR-T cells were lower than that of these two T cells combined with PD-1 inhibitor and the CAR-T cells from healthy volunteer T cells (P<0.001) . There was no difference of the cytotoxicity between the CAR-T cells from high PD-1 expression T cells combined with PD-1 inhibitor and the CAR-T cells from healthy volunteer (P>0.05) . ④There was no difference of the expression of PD-1 in all CAR-T cell groups during the culture process (P>0.05) . There was no difference of mRNA level of PD-1 in all groups during the culture process (P>0.05) . ⑤The PD-1 expression of CAR-T cells increased by the time of culture after contacting with lymphoma cells (P<0.001) . The PD-1 inhibitors could antagonize this effect. There was no difference of mRNA level of PD-1 in all groups after contacting with lymphoma cells (P>0.05) .@*Conclusion@#The PD-1 expression of CAR-T cells from high PD-1 expression T cells increased by the time of culture after contacting with lymphoma cells. However, the mRNA level of PD-1 of all groups did not change, even if PD-1 inhibitor was applied.
ABSTRACT
Objective To examine the APOBEC3G(hA3G)mRNA levels of four different groups in the human immunodeficiency virus(HIV)prevalent areas in central China and to analyze the relationship between hA3G mRNA levels and HIV disease progression.Methods We collected peripheral blood and isolated the peripheral boold monouuclear cells(PBMCs),and then cryo-preserved the PBMCs in liquid nitrogen.Prior to the total extraction of RNA,PBMCs were resuscitated and mRNA were reverse Transcripted to cDNA in vitro.Real-time polymerase chain reaction(PCR)was used to test hA3G mRNA levels of different groups.Results There were 13 HIV long term non-progressors with the mean CD+4 T lymphocyte count as(716±169)per μl and the mean affection time as(12.5±2.3)years.There were 48HIV slow progressors with the mean CD+4 T lymphocyte count as(233±144)per μl and the mean affection time as(10.7±2.2)years.The hA3G mRNA level of HIV long term nonprogressors was higher than that of normal people while the hA3G mRNA level of HIV slow progressors was higher than that of normal people and high risk people.There were no correlations between CD+4 T lymphocyte count and hA3G mRNA levels of HIV long term nonprogressors as well as in HIV slow progressors.Conclusion There was difference found in the hA3G mRNA levels of four groups in the HIV popular area in central China while no correlation between CD+4 T lymphocyte count and hA3G mRNA levels of HIV long term nonprogressors as well as in HIV slow progressors were found.