Antibodies production in rabbit

Methylisocytosine (LVIII, superacyl) has been reported to stimulate antibody production in rabbits to an extent greater than with a vaccine alone [354]. It also markedly reduced the development of pulmonary adenoma at 100 mg/kg per day for 10, 25 or 50 days s.c. or p.o. to mice, following a single i.p. injection of urethan. 5-Hydroxy-6-methylisocytosine had the same effect [19]. In tests on the effect of pyrimidines on reticuloendothelial functions in mice, the absorptive capacity of this system increased with 5-(hydroxymethyl)uracil or with 6-methylisocytosine. The effect was most pronounced when superimposed on cortisone inhibition [355]. When administered subcutaneously to mice, 6-methylisocytosine increased the inhibitory effect of thio-TEPA on the growth of Ehrlich tumours in mice. It is believed that this pyrimidine prevents the development of metastases [356]. 

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