Drug effects on dieldrin storage in rat tissue

Selected drugs were tested for effectiveness in reducing dieldrin retention by rats. Female rats were fed diets treated to contain 1 ppm dieldrin. The drugs were administered as feed additives or by i.p. injections. The rats were sacrificed after 10 days of treatment and abdominal adipose tissue was analyzed for dieldrin using electron capture gas chromatography.Heptabarbital (40 and 225 mg/kg rat/day), aminopyrine (75 and 350 mg/kg rat/day), tolbutamide (60 and 290 mg/kg rat/day), and phenylbutazone (90 mg/kg rat/day) were effective as feed additives in reducing tissue dieldrin. Heptabarbital was the most effective and reduced the concentration of tissue dieldrin by 80 per cent at the higher dose level. In comparison, DDT (4 mg/kg rat/day) effected a 72 per cent reduction. A contrast with DDT was also observed in trials with i.p. administration of drugs and DDT. In those trials, the duration of the DDT action was apparently greater than that of the drugs.We suggest that suitable drugs might be used to reduce insecticide accumulation in the tissues of animals and man, and for treatment of individuals after over exposure to insecticides.

Changes in mouse 7S gamma-globulin resulting from immunization with transplantable tumours

The antibody response of A strain mice to immunization with C57BL mouse leukaemia, EL4, is confined to the 7S γ-globulin.

A rapid chromatographic method has been developed for the isolation of mouse 7S γ-globulin in a high state of purity as judged by immunological and electrophoretic techniques.

The apparent molecular weight (M_SD) of the immune γ-globulin preparation did not differ significantly from that of the normal γ-globulin preparation.

However, weight average (M_W) and Z average (M_Z) molecular weights determined from sedimentation equilibrium experiments showed differences in the two preparations. The M_Z/M_W ratios showed that the molecular polydispersity in the immune sample was significantly greater than that in the normal sample.