Morpho-functional aspects of the influence of procaine and diethylaminoethanol treatment on the immune system of rabbits.

Research was conducted in 24 male rabbits divided into three equal groups: 1) Controls; 2) Given daily i.m. injections with 15 mg/kg body weight of procaine for 30 days; 3) Given daily i.m. injections with 15 mg/kg body weight of diethylaminoethanol (DEAE) for 35 days. Blood samples were taken from the auricular vein to perform haematological investigations: before treatment, during treatment and for another 7 weeks after termination of treatment. At the end of the experiment, the animals were sacrificed in order to collect: 1) leukocytes, macrophages and lymphocytes from their spleen, for the purpose of immunological investigations, and 2) fragments of bone marrow (femur), thymus and spleen, for histopathological investigations. The result of haematological investigations indicated a statistically significant increase of circulating lymphocytes had occurred in rabbits treated with DEAE. There was an increase of percentage as well as of number of circulating lymphocytes. The increase occurred gradually in the course of treatment and continued after treatment was terminated. There were higher values than the initial ones by 44.4% and 66.4%, respectively, during the second and the fourth week after termination of treatment. Afterwards, the values started decreasing, so that by the end of the experiment (week 7 after termination), the values came close to those before treatment. Immunological findings indicated that T lymphocytes collected from rabbits treated with procaine or DEAE did not synthesize migration inhibition factors. Procaine and DEAE were found, in vitro, not to have a polyclonal stimulating effect over T lymphocytes. A study of blastic differentiation showed lymphocytes from treated rabbits to incorporate a larger amount of tritiated thymidine, by 52.6% in the procaine group and by 90% in the DEAE group, than those from non-treated rabbits. Histopathological examination indicated signs of a more intense activity in tissue formations involved in cell proliferation in the lymphoid organs collected from DEAE treated rabbits.