Tissue contents of endothelin vary according to thyroid hormone status in rat.

Abstract:

:Endothelin-1 (ET-1) is a 21-residue peptide isolated from the conditioned medium of cultured porcine endothelial cells and is widely distributed throughout the body, with relatively high levels in the kidney and lung. In this study we examined the influence of thyroid hormone status on immunoreactive endothelin (ir-ET) levels in the plasma, lung, and kidney tissues of rats. Three weeks after surgical removal of the thyroid gland from male rats, the ir-ET levels in the lung and kidney were reduced by 39% and 42%, respectively. Similarly, ir-ET levels were decreased by 46% in the lung and 45% in the kidney of rats rendered hypothyroid by treatment with 0.1% (wt/wt) n-propylthiouracil (PTU) in the drinking water for 30 days. Replacement with daily L-thyroxine (T4) injections (5 micrograms/100 g) prevented this decrease. However, thyrotoxicosis induced by daily L-T4 injections (10 micrograms/100 g) also caused a decrease of the lung ir-ET levels by 49%, but had no significant effect on the renal ir-ET levels. However, the plasma ir-ET levels were similar in each group. Fast protein liquid chromatography study verified the presence of ir-ET-1 in the plasma and tissue extracts. This study demonstrates that thyroid hormone status affects tissue levels of ir-ET differently and that a euthyroid status is required for the maintenance of physiologic concentrations of ir-ET in the lung of male rats.

journal_name

J Cardiovasc Pharmacol

authors

Lam HC,Wang JP,Lee JK,Ho LT,Han TM,Lu CC,Chiang HT,Cheng DL

doi

10.1097/00005344-199322008-00078

subject

Has Abstract

pub_date

1993-01-01 00:00:00

pages

S299-302

eissn

0160-2446

issn

1533-4023

journal_volume

22 Suppl 8

pub_type

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