[Comparative S-adenosyl-L-methionine and S-adenosyl-L-homocysteine content in the tissues of experimental tumors in the process of their growth].
Content of S-adenosyl-l-methionine (SAM) in rat tissues of Pliss lymphosarcoma, of sarcoma 180 and in adenocarcinoma 755 of mice varied within the limits of 27-57 nM/g, 60-64 nM/g and 32-40 nM/g of wet tissue, respectively, content of S-adenosyl-l-homocysteine (SAH) varied in the tumors studied within the limits of 19-28, 16-21 and 11-20 nM/g, respectively. In the tumor bearing mice the content of SAM was unaltered in liver tissue during the growth of sarcoma 180 or adenocarcinoma 755. Development of Pliss lymphosarcoma in rats was accompanied by a decrease in content of SAM in liver tissue. When the rate of Pliss lymphosarcoma growth was decreased, the content of SAH in the tumor was unaltered but the level of SAM was decreased about 2-fold and the ratio SAH/SAM was increased, correspondingly, approximately 2-fold. If the rate of growth of mice adenocarcinoma 755 was elevated, content of SAM in the tumor was increased but the SAH level was markedly decreased and the ratio SAH/SAM was decreased about 2-fold. Concentrations of SAH and SAM were unaltered in mice sarcoma 180 with the linear rate of growth from 0.15 to 1.6 g. The data obtained suggest that the rate of growth of the tumors studied correlated with relative and absolute content of SAM and SAH.