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Hepatic microsomal ethanol-oxidizing system (MEOS): increased activity following propylthiouracil administration
Alcoholism, Clinical and Experimental Research
|January 1, 1981
Summary
Propylthiouracil and thyroid hormones both increase microsomal ethanol-oxidizing system activity in the liver. This suggests propylthiouracil
Area of Science:
- Biochemistry
- Pharmacology
- Hepatology
Background:
- Thyroid hormones regulate hepatic metabolism.
- The microsomal ethanol-oxidizing system (MEOS) is involved in ethanol metabolism.
- The role of thyroid status in MEOS activity is not fully understood.
Purpose of the Study:
- To investigate the effect of propylthiouracil (PTU) and thyroid hormones on hepatic MEOS activity.
- To determine if PTU's effect on MEOS is mediated by thyroid hormones.
Main Methods:
- Rats were treated with PTU to induce hypothyroidism or with thyroid hormones (L-thyroxine or L-triiodothyronine) to induce hyperthyroidism.
- Hepatic levels of thyroxine and triiodothyronine were measured.
- Activities of MEOS, alcohol dehydrogenase, and catalase were determined.
Main Results:
- PTU treatment resulted in a hypothyroid hepatic state and increased MEOS activity.
- Hyperthyroid states induced by L-thyroxine or L-triiodothyronine also increased MEOS activity.
- Alcohol dehydrogenase activity decreased in hyperthyroid states, while catalase activity remained unchanged in both conditions.
Conclusions:
- Both PTU and thyroid hormones increase hepatic MEOS activity.
- The induction of MEOS by PTU is independent of thyroid hormone action.
- Thyroid status significantly influences hepatic ethanol metabolism pathways.