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Drug excretion into eggs. An autoradiographic study
Archives of Toxicology. Supplement. = Archiv Fur Toxikologie. Supplement
|January 1, 1978
Summary
This study tracked drug distribution in Japanese quail eggs using autoradiography. Findings reveal varying uptake in oocytes and excretion patterns, with some drugs concentrating in the eye.
Area of Science:
- Pharmacokinetics and drug distribution in avian species.
- Oocyte uptake and egg composition analysis.
Background:
- Understanding drug distribution is crucial for avian health and food safety.
- Previous research has not fully elucidated the distribution of specific compounds in quail eggs.
Purpose of the Study:
- To illustrate the distribution pattern of 14C-trimethoprim, 3H-tetracycline, and 14C-urea in Japanese quail.
- To investigate the uptake of these compounds by oocytes and their excretion into egg-white.
- To examine drug localization within different tissues, including the eye.
Main Methods:
- Whole-body autoradiography using Ulberg's technique.
- Radiolabeling of trimethoprim, tetracycline, and urea for tracking.
- Analysis of compound distribution in oocytes, yolk, egg-white, and specific organs.
Main Results:
- Significant differences in follicular epithelium uptake were observed between oocytes of varying sizes.
- Compounds reaching the yolk remained localized, while others were excreted.
- Varied distribution patterns in the oviduct suggest passive diffusion.
- High concentrations of some compounds were noted in the retina and pecten of the quail eye.
Conclusions:
- Drug distribution in quail eggs is complex, with size-dependent oocyte uptake.
- The yolk acts as a sequestration site, while excretion occurs via other routes.
- Passive diffusion influences oviductal distribution, and specific ocular tissues exhibit unique accumulation patterns.