[3H] cortisol binding by young and old human liver cytosol proteins in vitro
International Journal of BiochemistryPublished 1 January 1973
Sanford S. Singer, Hiroko Itô, Gerald Litwack
Citations43
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TL;DR
There is a significant quantitative decrease in the binding proteins with old age, similar to that seen in rat and human.
Abstract
1. Corticosteroid binding proteins of liver cytosol arc similar in rat and human. 2. There is a significant quantitative decrease in the binding proteins with old age.
Keywords
MedicineNeuroscienceBiochemistry, Genetics and Molecular Biology
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Radioactivity in rat liver was investigated 20 min after intraperitoneal injection of 20 and 200 μC of [3H]cortisol and was found to be weakly associated with a macromolecular fraction in a form resistant to nucleases but sensitive to pronase, trypsin and neuraminidase.
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76 Citations1971Sanford S. Singer, Gerald Litwack
The effects of age and sex upon the uptake, metabolism and binding of 3H-cortisol by rat liver and on the induction of hepatic tyrosine aminotransferase were studied.
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An isotopic method has been developed for the measurement of tyrosine transaminase activity based upon the use of a radioactive amino acid substrate and detection of radioactivity in its keto acid analog separated by ion-exchange chromatography.
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PubMedIdentity of corticosteroid binder I with the macromolecule binding 3-methylcholanthrene in liver cytosol in vivo.
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Although cortisol radioactivity does not remain bound after the electrofocusing step, aligning with the behavior of Binder I, the 3-methylcholanthrene binder can be shown to rebind corticosterone to form a complex which has the anticipated molecular weight.
Biochimica et Biophysica Acta (BBA) - General SubjectsBinding of a [14C]hydrocortisone metabolite in liver supernatant
31 Citations1966Emerich S. Fiala, Gerald Litwack
Most of the radioactive material from the liver supernatan, following injection of the isotope in vivo, consisted of at least three electrophoretically distinct, negatively charged components.
Biochimica et Biophysica Acta (BBA) - General SubjectsIntracellular binding of [14C]hydrocortisone prior to enzymatic induction
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