[Establishment of K562/NOD-SCID mouse model with leukemia]

The study was aimed to establish a K562/NOD-SCID leukemia mouse model and to explore its growth characteristics. Nude mice exposed to total body irradiation were inoculated subcutaneously with K562 cells, then the local K562 tumor was taken out and the tumor tissues without necoosis were selected for preparing single cell suspension which was inoculated into irradiated NOD/SCID mice by intraperitoneal injection. The results indicated that the systemic disseminated leukemia model was established successfully by intraperitoneal injection. On the fourth week after inoculation the leukemia cells were found on peripheral blood smear, and the leukemia cell infiltration was observed in liver, spleen and bone marrow. On the brink of death, the count of peripheral blood WBC was 8 - 10 times as much as that before inoculation. The leukemia cells on peripheral blood smear accounted to 20% - 30% of the total WBCs on average. The local tumors appeared in the abdominal cavity or on the greater omentum, less were involved in other organs. It is concluded that the established K562/NOD-SCID mouse model with leukemia well imitates the process of leukemia in human body, so it is a good model for the research on the effects of new drugs and target or gene therapy.