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Elevation of serum lipids after chronic administration of amiodarone in rabbits
Abstract:
Amiodarone hydrochloride is a potent, iodine-containing antiarrhythmic compound with a long elimination half-life, whose cardiac action appears to be mediated through an interference with thyroxine-dependent pathways in the heart. Whether it has any effect on lipid metabolism is not known. Its effect (20 mg/kg per day intraperitoneally) after 3 and 6 weeks of treatment on changes in serum lipoproteins were studied in male New Zealand white rabbits. Serum amiodarone levels reached a steady state (approximately 0.05 microgram/ml) after 3 weeks, and serum reverse T3 (an index of drug dose and duration of treatment) increased 3-4 fold by 3 and 6 weeks. In two discrete sets of studies, serum triglyceride (TG) and total cholesterol (CHOL) increased significantly (P less than 0.01) after 3 and 6 weeks on amiodarone when compared to the values in a control series of animals. Phospholipid (PL) levels were not changed. Very low density lipoproteins (VLDL) in the drug-treated groups showed a significant increase in triglyceride (P less than 0.01) and in apoprotein B (P less than 0.05). There was no change in low density lipoprotein-apoprotein B levels. Whether the abnormalities observed in serum lipids induced by amiodarone are mediated through changes in thyroid hormones or occur as a result of a direct effect on lipid metabolism is unknown, but the problem merits further investigation.
Insights
Amiodarone hydrochloride significantly increases serum triglyceride and cholesterol levels in rabbits, potentially impacting lipid metabolism. Further research is needed to understand the mechanisms behind these observed lipid abnormalities.
Area of Science:
- Pharmacology
- Cardiovascular Medicine
- Biochemistry
Background:
- Amiodarone hydrochloride is an antiarrhythmic drug affecting cardiac pathways.
- Its impact on lipid metabolism remains largely uncharacterized.
- Thyroid hormone interactions are implicated in amiodarone's cardiac effects.
Purpose of the Study:
- To investigate the effects of amiodarone hydrochloride on serum lipoproteins in a rabbit model.
- To determine if amiodarone influences lipid metabolism.
Main Methods:
- Male New Zealand white rabbits received daily intraperitoneal injections of amiodarone (20 mg/kg).
- Serum amiodarone levels, reverse T3, triglyceride, cholesterol, and phospholipid levels were measured at 3 and 6 weeks.
- Lipoprotein analysis focused on very low-density lipoproteins (VLDL) and low-density lipoproteins (LDL).
Main Results:
- Serum amiodarone reached steady-state levels by 3 weeks; reverse T3 increased significantly.
- Amiodarone treatment led to significant increases in serum triglyceride and total cholesterol.
- VLDL showed increased triglyceride and apoprotein B, while LDL-apoprotein B remained unchanged.
Conclusions:
- Amiodarone hydrochloride significantly alters serum lipid profiles in rabbits, increasing triglycerides and cholesterol.
- The observed lipid abnormalities may be linked to thyroid hormone pathways or direct effects on lipid metabolism.
- Further investigation is warranted to elucidate the precise mechanisms of amiodarone-induced dyslipidemia.