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Plasma endothelin levels are unaltered by thyroid hormone status in humans
1Department of Medicine, Veterans General Hospital-Kaohsiung and National Yang-Ming University School of Medicine, Taiwan, Republic of China. hclam@isca.vghks.gov.tw
Journal of Cardiovascular Pharmacology
|November 15, 2000
Summary
Thyroid hormone status does not significantly affect plasma endothelin (ET) levels in humans. This study found no differences in immunoreactive endothelin (irET) concentrations across euthyroid, hypothyroid, and hyperthyroid individuals.
Area of Science:
- Endocrinology
- Cardiovascular Physiology
Background:
- Endothelin (ET) is a potent vasoconstrictor peptide with diverse biological roles.
- Previous research indicated that thyroid hormone status influences tissue endothelin levels in rats.
Purpose of the Study:
- To investigate the relationship between thyroid hormone status and plasma endothelin levels in humans.
- To determine if hypothyroidism or hyperthyroidism affects circulating immunoreactive endothelin (irET) concentrations.
Main Methods:
- Plasma samples were collected from euthyroid, hypothyroid, and hyperthyroid subjects.
- Immunoreactive endothelin (irET) was extracted using Sep-Pak C18 cartridges.
- Plasma irET concentrations were quantified using radioimmunoassay.
Main Results:
- No significant differences in plasma irET levels were observed among the three thyroid function groups.
- No correlations were found between plasma irET levels and thyroid hormones (T3, T4) or thyrotropin (TSH).
Conclusions:
- Thyroid function does not appear to be a primary regulator of plasma endothelin levels in humans.
- These findings suggest that the influence of thyroid status on endothelin may be tissue-specific or not directly reflected in plasma concentrations.