We have located links that may give you full text access.
Familial dysalbuminemic byperthyroxinemia may result in altered warfarin pharmacokinetics.
Chemico-biological Interactions 2000 Februrary 2
Two distinct genotypes that result in the amino acid substitutions R218P and R218H in subdomain 2A of human serum albumin (HSA) have been identified as the cause of familial dysalbuminemic hyperthyroxinemia (FDH). These substitutions increase the affinity of subdomain 2A for thyroxine by approximately 10-fold elevating plasma thyroxine levels in affected individuals. While many studies have examined the binding of thyroxine to FDH HSA, the binding of FDH HSA to drugs has not been widely investigated. The widely administered drug warfarin was selected as a model compound to study FDH HSA/drug interactions since it binds to subdomain 2A and its pharmacokinetics are dramatically influenced by HSA binding. Using two independent methods, fluorescence spectroscopy and equilibrium dialysis with radioactive warfarin, the binding of recombinant R218P, R218H, R218M and wild type HSA to warfarin was measured. Both methods showed an approximately 5-fold decrease in the affinity of R218P, R218H and R218M HSA for warfarin relative to wild type HSA. The Kd values determined by fluorescence spectroscopy for wild type, R218H, R218P and R218M HSA binding to warfarin were 1.35, 5.38, 5.61, and 8.34 microM, respectively. The values determined by equilibrium dialysis were 5.36, 29.5, 14.5, and 23.4 microM, respectively. Based on the above findings one would expect the free serum warfarin concentration in homozygous R218P and R218H FDH patients to be elevated about 5-fold, resulting in about a 5-fold reduction in the serum half-life of the drug.
Full text links
Trending Papers
A Personalized Approach to the Management of Congestion in Acute Heart Failure.Heart International 2023
Potential Mechanisms of the Protective Effects of the Cardiometabolic Drugs Type-2 Sodium-Glucose Transporter Inhibitors and Glucagon-like Peptide-1 Receptor Agonists in Heart Failure.International Journal of Molecular Sciences 2024 Februrary 21
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app