The availability of antibodies against the ovine corticotropin releasing factor (CRF), which cross-react with a CRF-like immunoreactivity (CRF-LI) in the rat, has enabled us to develop a radioimmuoassay (RIA) for rat CRF-LI in plasma and crude hypothalamic extracts. 125I-Tyr-CRF 1-41 was used as the tracer, and synthetic ovine CRF as the reference hormone. The precision profile of the assay indicates a high degree of reproducibility except for the lower dose range. The minimum detectable dose was 20 pg/tube. This assay can detect differences in plasma CRF-LI levels after various manipulations that simultaneously alter the ACTH levels in plasma. A wide range of CRF concentrations has been found in plasma of normal rats. Caution should be exercised in the interpretation of the values obtained since an ovine RIA system was used.
|Original language||English (US)|
|Number of pages||7|
|Journal||Proceedings of the Society for Experimental Biology and Medicine|
|State||Published - Jul 1983|
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)