Changes of enzyme activities in spleen lymphocytes from tumor-bearing rats.

The induction of concomitant immunity was studied in Donryu strain rats with Yoshida ascites sarcoma cells. The changes of enzyme activity in spleen lymphocytes were also examined in normal and tumor-bearing rats. The concomitant immunity was detected 1 week after transplantation of tumor cells. Extended metastases were found 2 weeks after transplantation. The enzyme activities of ATPase and acid phosphatase were definitely higher than that of normal rat 1 week after the transplantation but decreased to lower level than normal 2 weeks later. On the other hand, alkaline phosphatase activity increased 3 times at 1 week after the transplantation and remained at the same level even at 2 weeks later.