Effect of Immunization on the Cyclic AMP Level and 3H-Thymidine Incorporation in Cultured Lymphoid Cells

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Abstract
The cyclic AMP level and the uptake of 3H-thymidine were studied in short-term suspension cultures of guinea pig lymphoid cells. Spleen cells from animals immunized 3 days previously with typhoid vaccine were shown to differ in three respects from the normal cells: (1) The level of cyclic AMP was higher. (2) The cyclic AMP increase following addition of isoproterenol or adenosine was abolished. (3) Isoproterenol (10-5 to 10-4M) stimulated the uptake of 3H-thymidine in cells from immunized animals, while the uptake into normal cells was inhibited by these concentrations. A higher dose of isoproterenol (10-3M) inhibited 3H-thymidine uptake in both immunized and normal cells. The results reveal certain biochemical alterations in splenic lymphocytes after immunization. An altered 3H-thymidine uptake may be caused by the modified cyclic AMP metabolism in cells from immunized animals.

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