Effects of salicylate on the incorporation of orotic acid into nucleic acids of mouse tissues in vivo

In mice, given intraperitoneal injections of orotic acid-5-3H, two peaks of incorporation of radioactivity at 30 min and 6 h occurred in the RNA of kidney and of liver and its subcellular components. The concurrent administration of salicylate, in doses of 200 mg/kg body weight and above, significantly inhibited the incorporation of the labelled orotic acid at 30 min but not at 6 h.

The determination of the binding of salicylate to serum proteins

The ratios of protein-bound to unbound salicylate in bovine, calf, horse and human sera were measured by equilibrium dialysis, ultrafiltration and frontal elution techniques. The equilibrium dialysis method gave the best measure of binding capacity, but several factors were found to affect the results. These factors include adsorption of the drug onto the dialysing membrane, the composition of the dialysing fluid, the necessity to allow sufficient time for equilibrium to be attained in the presence of serum, and the occurrence of dialysable substances in sera which may either compete with or displace salicylate from its binding sites.

Inhibition of glutamate decarboxylase by salicylate in vitro

Salicylate inhibits the activity of glutamate decarboxylase from Escherichia coli by a reversible mechanism, but high concentrations of the drug denature the enzyme protein

Salicylate inhibits the activity of glutamate decarboxylase prepared from Escherichia coli and rat brain (Gould, Huggins & Smith, 1963; Gould & Smith, 1965). It was suggested that the mechanism of inhibition involved an irreversible combination of the drug with the enzyme protein. This mechanism has not been confirmed in the present work. High concentrations of salicylate denature, and lower concentrations cause a reversible inhibition of the bacterial enzyme.

Obligatory sperm storage in the skink Hemiergis peronii

Female Hemiergis peronii ovulate in the spring; males' testes are small and without sperm in the spring, enlarge to a maximum in late summer, and decrease in the winter. Females' oviducts contain sperm over the winter. It follows that females are inseminated in autumn and store sperm until they ovulate in spring.

The distribution of salicylate in mouse tissues after intraperitoneal injection

The concentrations of salicylate and its principal metabolites were measured in blood, liver, brain, kidney, heart, spleen, diaphragm and skeletal muscle after the intraperitoneal injection of a fixed amount of radioactive salicylate and varying doses of unlabelled salicylate. The patterns of distribution of salicylate in the various organs with time were similar, the peak level being attained in 30–60 min after injection. Salicylate was eliminated from the blood after 8 hr but persisted in liver in measurable amounts up to 24 hr.