A radioimmunoassay for serum rat thyroglobulin. Physiologic and pharmacological studies.

The Journal of Clinical Investigation
A J van HerleR P Uller

Abstract

A double antibody radioimmunoassay has been developed to measure thyroglobulin in rat (RTg) serum. The lowest detectable quantity measurable was 5.0 ng/ml. Specificity was documented by: (a) fall in serum RTg to undetectable levels after thyroid ablation; (b) the fact that L-thyroxine, D-thyroxine, L-triiodothyronine, D-triiodothyronine, triiodothyroacetic acid, tetraiodothyroacetic acid, triiodothyropropionic acid, moniodotyrosine, diiodotyrosine, and human thyroglobulin (HTg) in concentrations up to 40,000 ng per tube did not cross-react in the assay; (c) the demonstration that constant levels of serum RTg were observed while varying amounts of serum (criterion of parallelism) were introduced in the assay. The mean RTg concentration in tail vein blood of adult Sprague-Dawley rats were 101.5 +/- 13.0 ng/ml (SEM) (n=21); values ranged from 12.0 to 258.0 ng/ml. Chronic administration of a high-iodine diet (HID) did not affect serum thyroglobulin levels. Chronic administration of a low-iodine diet (LID) and propylthiouracil (PTU) led to a statistically significant increase in serum RTg that was accompanied by a significant rise in serum thyrotropin (rTSH). Serum thyroxine (T4) administered to normal rats for 14 days (20 mug/day s...Continue Reading

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