EFFECT OF SELENIUM DEFICIENCY ON HEPATIC TYPE-I 5-IODOTHYRONINE DEIODINASE ACTIVITY AND HEPATIC THYROID-HORMONE LEVELS IN THE RAT

G J BECKETT, A RUSSELL, Fergus Nicol, P SAHU, C R WOLF, John Arthur

Research output: Contribution to journalArticle

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Abstract

Selenium deficiency in rats for a period of up to 6 weeks inhibited both the production of 3,3',5-tri-iodothyronine (T3) from thyroxine (T4) (5'-deiodination) and also the catabolism of T3 to 3,3'-di-iodothyronine (5-deiodination) in liver homogenates. The hepatic stores of T3 were decreased by only 8% in selenium deficiency, despite the T3 production rate from T4 being only 7% of the rate found in selenium-supplemented rats. Hepatic glutathione S-transferase (GST) activity was increased in both hypothyroidism and selenium deficiency, but apparently by different mechanisms, since mRNA expression for this family of enzymes was lowered by hypothyroidism and increased in selenium deficiency. It is concluded that, since both T3 production and catabolism are inhibited by selenium deficiency, there is little change in hepatic T3 stores, and therefore the changes in the activity of certain hepatic enzymes, such as GST, that are found in selenium deficiency are not the result of tissue hypothyroidism.

Original languageEnglish
Pages (from-to)483-486
Number of pages4
JournalBiochemical Journal
Volume282
Publication statusPublished - 1 Mar 1992

Keywords

  • GLUTATHIONE S-TRANSFERASE
  • MESSENGER-RNA
  • LIVER
  • EXPRESSION
  • IODOTHYRONINE
  • PEROXIDASE
  • INHIBITION
  • THYROXINE
  • SERUM
  • GENES

Cite this

BECKETT, G. J., RUSSELL, A., Nicol, F., SAHU, P., WOLF, C. R., & Arthur, J. (1992). EFFECT OF SELENIUM DEFICIENCY ON HEPATIC TYPE-I 5-IODOTHYRONINE DEIODINASE ACTIVITY AND HEPATIC THYROID-HORMONE LEVELS IN THE RAT. Biochemical Journal, 282, 483-486.

EFFECT OF SELENIUM DEFICIENCY ON HEPATIC TYPE-I 5-IODOTHYRONINE DEIODINASE ACTIVITY AND HEPATIC THYROID-HORMONE LEVELS IN THE RAT. / BECKETT, G J ; RUSSELL, A ; Nicol, Fergus; SAHU, P ; WOLF, C R ; Arthur, John.

In: Biochemical Journal, Vol. 282, 01.03.1992, p. 483-486.

Research output: Contribution to journalArticle

BECKETT, G J ; RUSSELL, A ; Nicol, Fergus ; SAHU, P ; WOLF, C R ; Arthur, John. / EFFECT OF SELENIUM DEFICIENCY ON HEPATIC TYPE-I 5-IODOTHYRONINE DEIODINASE ACTIVITY AND HEPATIC THYROID-HORMONE LEVELS IN THE RAT. In: Biochemical Journal. 1992 ; Vol. 282. pp. 483-486.
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abstract = "Selenium deficiency in rats for a period of up to 6 weeks inhibited both the production of 3,3',5-tri-iodothyronine (T3) from thyroxine (T4) (5'-deiodination) and also the catabolism of T3 to 3,3'-di-iodothyronine (5-deiodination) in liver homogenates. The hepatic stores of T3 were decreased by only 8{\%} in selenium deficiency, despite the T3 production rate from T4 being only 7{\%} of the rate found in selenium-supplemented rats. Hepatic glutathione S-transferase (GST) activity was increased in both hypothyroidism and selenium deficiency, but apparently by different mechanisms, since mRNA expression for this family of enzymes was lowered by hypothyroidism and increased in selenium deficiency. It is concluded that, since both T3 production and catabolism are inhibited by selenium deficiency, there is little change in hepatic T3 stores, and therefore the changes in the activity of certain hepatic enzymes, such as GST, that are found in selenium deficiency are not the result of tissue hypothyroidism.",
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AB - Selenium deficiency in rats for a period of up to 6 weeks inhibited both the production of 3,3',5-tri-iodothyronine (T3) from thyroxine (T4) (5'-deiodination) and also the catabolism of T3 to 3,3'-di-iodothyronine (5-deiodination) in liver homogenates. The hepatic stores of T3 were decreased by only 8% in selenium deficiency, despite the T3 production rate from T4 being only 7% of the rate found in selenium-supplemented rats. Hepatic glutathione S-transferase (GST) activity was increased in both hypothyroidism and selenium deficiency, but apparently by different mechanisms, since mRNA expression for this family of enzymes was lowered by hypothyroidism and increased in selenium deficiency. It is concluded that, since both T3 production and catabolism are inhibited by selenium deficiency, there is little change in hepatic T3 stores, and therefore the changes in the activity of certain hepatic enzymes, such as GST, that are found in selenium deficiency are not the result of tissue hypothyroidism.

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