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Mechanism of creatinuria in experimental hyperthyroidism
Acta Endocrinologica
|August 1, 1981
Summary
Experimental hyperthyroidism increases creatine excretion in rats by enhancing its release from muscles and de novo synthesis. This leads to reduced muscle creatine levels, despite altered specific activity, impacting creatine metabolism.
Area of Science:
- Biochemistry
- Physiology
- Endocrinology
Background:
- Hyperthyroidism is known to affect energy metabolism.
- Creatine plays a crucial role in cellular energy homeostasis.
- Understanding creatine metabolism alterations in hyperthyroidism is important.
Purpose of the Study:
- To elucidate the mechanisms underlying creatinuria in experimental hyperthyroidism.
- To investigate the impact of hyperthyroidism on creatine synthesis, release, and uptake in different tissues.
Main Methods:
- Rats were pre-labeled with radioactive [14C]creatine.
- Experimental hyperthyroidism was induced over a 20-day period.
- Radioactive creatine content and specific activity in skeletal muscle and myocardium were measured.
Main Results:
- Hyperthyroidism significantly increased creatine excretion (creatinuria).
- Increased creatine release from skeletal muscle and enhanced de novo synthesis contributed to creatinuria.
- Skeletal muscle showed reduced radioactive creatine content and increased specific activity, indicating decreased uptake and increased loss.
- Myocardium exhibited higher radioactive creatine content, suggesting decreased creatine loss.
Conclusions:
- Experimental hyperthyroidism disrupts creatine homeostasis through complex mechanisms.
- Altered creatine kinetics in skeletal muscle and myocardium highlight tissue-specific responses to thyroid hormone excess.
- Findings provide insights into the metabolic consequences of hyperthyroidism on creatine metabolism.