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. 1989 Apr 15;259(2):555–559. doi: 10.1042/bj2590555

Iodothyronine 5'-deiodinase activity as an early event of prenatal brown-fat differentiation in bovine development.

M Giralt 1, L Casteilla 1, O Viñas 1, T Mampel 1, R Iglesias 1, J Robelin 1, F Villarroya 1
PMCID: PMC1138544  PMID: 2719666

Abstract

Iodothyronine 5'-deiodinase activity appears to be a type I enzyme in bovine brown adipose tissue, on the basis of its high Km for 3,3',5'-tri-iodothyronine ('reverse T3') (in the micromolar range) and sensitivity to propylthiouracil inhibition. This enzyme activity is already detectable in perirenal adipose tissue of bovine fetuses in the second month of gestation, reaches peak values around the seventh month of fetal life, declines before birth, becomes lower after parturition and finally undetectable in the adult cow. Iodothyronine 5'-deiodinase activity is present in the pericardic, peritoneal and intermuscular adipose depots of the neonatal calf, but it is always undetectable in the subcutaneous adipose tissue. It is concluded that iodothyronine 5'-deiodinase is a specific feature of brown fat in the bovine species that is not shared by white adipose tissue. white adipose tissue. Peak values of 5'-deiodinating activity appear as an early event in the prenatal differentiation programme of bovine brown-fat cells as they occur when uncoupling-protein-gene expression first starts.

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Selected References

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