A thyroxine binding globulin (TBG)-like protein in the sera of developing and adult rats

We report evidence based on equilibrium binding, electrophoretic, autoradiographic studies, that the rat possesses a major high affinity thyroid hormone binding protein, with an electrophoretic mobility and binding properties similar to those of the human thyroxine binding globulin (TBG). We show th...

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Veröffentlicht in:Biochemical and biophysical research communications 1987-11, Vol.148 (3), p.1165-1173
Hauptverfasser: Savu, Lia, Vranckx, Roger, Maya, Michelle, Nunez, Emmanuel A.
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container_title Biochemical and biophysical research communications
container_volume 148
creator Savu, Lia
Vranckx, Roger
Maya, Michelle
Nunez, Emmanuel A.
description We report evidence based on equilibrium binding, electrophoretic, autoradiographic studies, that the rat possesses a major high affinity thyroid hormone binding protein, with an electrophoretic mobility and binding properties similar to those of the human thyroxine binding globulin (TBG). We show that in the sera of postnatal developing animals, the thyroxine and the triiodothyronine binding activities increase up to 10 times over adult or foetal levels, due to a high transient post-natal surge of the rat TßG. In the adult serum, the TBG persists in decreased amounts : it then yields the predominant role as thyroxine carrier to the thyroid binding prealbumin, but retains the major role as binder of triiodothyronine i.e. of the biologically active thyroid hormone.
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subjects Age Factors
alpha-Fetoproteins - metabolism
Animals
Applied sciences
Exact sciences and technology
Other techniques and industries
Prealbumin - metabolism
proteins
Rats
Thyroxine - metabolism
thyroxine-binding globulin
Thyroxine-Binding Proteins - metabolism
Triiodothyronine - metabolism
title A thyroxine binding globulin (TBG)-like protein in the sera of developing and adult rats
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