[Isolation and Biological Characterization of Lung Cancer Stem Cells]

Objective To explore the methods of screening and biological characteristics of lung cancer stem cells. Methods We selected the ABCG2 ⁺and ABCG2 ^-cells from SPC-A-1/adriamycin(ADM)cell line induced by ADM and analyzed the tumorigenicity of ABCG2 ⁺and ABCG2 ^-cells in vivo by flow cytometry and transplantation in nude mice. Results The average fluorescence intensity of SPC-A-1 cells was(1.001±0.014)×10 ²,which was significantly lower than that of SPC-A-1/ADM cells [(10.257±0.023) ×10 ² ](t=17.320,P=0.001);the difference was also statistically significant between the ABCG2/BCRP-FITC treatment group and the SPC-A-1 control group(t=5.269,P=0.021) and the SPC-A-1 control group(t=6.869, P=0.012) and between the SPC-A-1/ADM cell control group and the SPC-A-1/ADM cell homotype control group(t=8.112,P=0.015).The positive rate of SPC-A-1/ADM cells treated with ABCG2/BCRP-FITC was 9.8%,39.84 times higher than that of SPC-A-1 cells;it showed significant difference between the ABCG2/BCRP-FITC group and the SPC-A-1/ADM group(t=9.120,P=0.005) and the SPC-A-1/ADM group(t=8.257,P= 0.006).The positive rate of group B cells was 684 times that of group A cells,and the difference was statistically significant(t=11.235,P=0.001),and the fluorescence intensity of group B cells was strong.The average tumorigenic volume of the mice inoculated with SPC-A-1 cells,group A cells,and group B cells was(6.96±1.82),(6.70±2.55),and(9.17±2.41) mm ³,respectively.Among them,group B was the highest,but there was no significant difference among these three groups(F=2.362,P=0.086).The tumorigenic rate of group B cells was 75.00%,which was significantly higher than that of SPC-A-1 cells and group A cells(F=19.780,P=0.002). Conclusion ABCG2 cells from human lung adenocarcinoma SPC-A-1/ADM cell line can be isolated by ABCG2 antibody combined with immunomagnetic beads sorting method,and the tumor formation rate in nude mice can be observed to explore the identification and biological characterization of lung cancer stem cells.