Markedly increased concentrations of free fatty acids after a fatty meal and heparin injection already have been shown to falsely increase thyroxine values measured by competitive protein-binding techniques, where ethanol extraction in used. We report here the effect of lesser increases. In 10 patients receiving heparin during hemodialysis we found significant increases in serum thyroxine by co...

We compared results obtained by (a) chemical (spectrophotometric) and competitive protein-binding assays for serum corticosteroids, and (b) competitive protein-binding and radioimmunoassay, with and without CCI-4 extraction, for serum cortisol. The two corticosteroid methods gave identical results. Radioimmunoassay with and without a CCI-4 extraction step gave identical results for cortisol. Co...

Abstract Phenolic compounds are ubiquitous plant secondary metabolites that possess various biological activities and known to interact with proteins, altering their structure properties. Therefore, interactions between these proteins has gained increasing attention due potential benefits human health for exploitation by the food industry. can form complexes via covalent linkages and/or non-cov...

The DNA-dependent protein kinase (DNA-PK) is a serine/threonine protein kinase that is involved in mammalian DNA double-strand break repair. The catalytic subunit of DNA-PK (DNA-PKcs) shares sequence homology in its kinase domain with phosphatidylinositol (PI) 3-kinase. Here, we provide a detailed kinetic analysis of DNA-PK inhibition by the PI 3-kinase inhibitor wortmannin and demonstrate this...

We describe a modified competitive protein-binding method for assay of plasma cortisol. Plasma samples are deproteinized by dilution with an ethanol/phosphate buffer, followed by heating at 100 degrees C for 2 min. Horse serum is used as the source of transcortin. Free radioactivity is separated from the protein-bound component by partition into liquid scintillation counting within 60 min. The ...

A simple radioligand assay has been developed for measuring cortisol in plasma and urine. The antiserum was produced in rabbits by using cortisoi-21hemisuccinyl-bovine serum albumin as the antigen. The standard curve was linear from 0-1000 pg. A small aliquot of ethanol-precipitated plasma or urine is directly assayed. Interassay variability of 56 separate assays of a normal plasma pool during ...