Binding activities of thyroxine binding globulin versus thyroxine binding prealbumin in rat sera: differential modulation by thyroid hormone ligands, oleic acid and pharmacological drugs

Biochemical and Biophysical Research Communications
L SavuE A Nunez

Abstract

We use gel equilibration and electrophoretic techniques to compare the binding properties of thyroxine binding globulin and thyroxine binding prealbumin in rat sera. The evidence indicates that TBG bears the serum lowest capacity highest affinity sites for thyroxine (T4) and triiodothyronine (T3) (Ka1 greater than or equal to 10(9) M-1) as well as weaker saturable T3 sites (Ka2 approximately 10(8) M-1). TBPA bears for T4 only Ka2 approximately 10(8) M-1 sites and for T3 only Ka approximately 10(6) M-1 sites. Consistent with these parameters are the specific responses of TBG and TBPA binding activities to varying serum concentrations of T4, T3, oleic acid, the drugs diphenylhydantoin or salicylate. The primary attack of these compounds is aimed at TBG. Small T4, oleate or DPH doses chase the TBG-bound T4 to TBPA, high doses of T4 or oleate but not of DPH inhibiting the T4 binding to both proteins. In the T3-serum interactions, all tested compounds displace the TBG-bound hormone without chasing it to TBPA. The high reactivity of TBG sites designates the protein as crucially involved in modulating the free vs bound serum levels of T4 and T3 against physiological or pathological variations of binding competitors.

References

Nov 13, 1987·Biochemical and Biophysical Research Communications·L SavuE A Nunez
Oct 1, 1986·Postgraduate Medical Journal·W M Wiersinga, M D Trip
Apr 1, 1984·The Journal of Clinical Endocrinology and Metabolism·I J ChopraD H Solomon
Mar 1, 1980·Pediatric Research·P WalkerJ H Dussault

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Citations

Dec 28, 1999·Electrophoresis·I EberiniE Gianazza
Jul 26, 1991·Biochimica Et Biophysica Acta·L SavuI L Flink
Jan 23, 1999·European Journal of Biochemistry·L ChangG Schreiber
Aug 1, 1995·Thyroid : Official Journal of the American Thyroid Association·C F LimJ R Stockigt
Aug 1, 1997·Thyroid : Official Journal of the American Thyroid Association·S Benvenga
Jan 17, 2012·Proteomics·Elisabetta GianazzaIngrid Miller
Nov 1, 1994·Endocrine Research·M H Lu, R R Anderson
Sep 20, 2020·Journal of Biomolecular Structure & Dynamics·Nicoleta SanduMonica Florescu

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