Abstract
1. The xanthine-dehydrogenase activity of chick liver, expressed per mg. of nitrogen, is increased during starvation. 2. Administration of inosine and possibly of adenine has a comparable effect on the xanthine dehydrogenase, and also induces an elevation of the total quantity of enzyme. Hypoxanthine, xanthine, guanine, xanthosine, guanosine and adenosine are ineffective. Cortisone is equally ineffective. 3. The administration of puromycin abolishes the effect of inosine and reduces that of starvation. It is concluded that inosine induces an increased synthesis of xanthine dehydrogenase, whereas during starvation the enzyme is spared with respect to other liver proteins. 4. The hypothesis is formulated that chick-liver xanthine dehydrogenase is an adaptive enzyme, its activity being regulated by inosine or by one of its metabolites.
Keywords
CORTISONE
EXPERIMENTAL LAB STUDY
GUANINE
HYPOXANTHINES
LIVER ENZYMOLOGY
NUCLEOSIDES
PHARMACOLOGY
POULTRY
PUROMYCIN
SPECTROPHOTOMETRY
STARVATION
XANTHINE OXIDASE
XANTHINES
MeSH Terms
Adenine
Adenosine
Animals
Chickens
Cortisone
Guanine
Guanosine
Hypoxanthines
Inosine
Liver/enzymology
Nucleosides
Pharmacology
Poultry
Purine Nucleosides
Purines
Puromycin
Research
Ribonucleosides
Spectrophotometry
Starvation
Xanthine Dehydrogenase
Xanthine Oxidase
Xanthines
Chemicals
Hypoxanthines
Nucleosides
Purine Nucleosides
Purines
Ribonucleosides
Xanthines
Guanosine
Puromycin
Inosine
Guanine
xanthosine
Xanthine Dehydrogenase
Xanthine Oxidase
Adenine
Adenosine
Cortisone
purine
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
STIRPE F
DELLACORTE E
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30 references, click to expand
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