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(Received for publication, November 19, 1996, and in revised form, April 9, 1997)
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From The iodothyronine deiodinases are a family of
selenoproteins that metabolize thyroxine and other thyroid hormones to
active and inactive metabolites in a number of tissues including brain. Using primary cultures of rat astroglial cells as a model system, we
demonstrate that the mRNA for the type II iodothyronine deiodinase (DII) selenoenzyme is rapidly and markedly induced by forskolin and
8-bromo-cAMP. The induction of DII activity, however, was significantly
impaired by culturing cells in selenium-deficient medium for 7 days.
Under such conditions, the addition of selenium resulted in a rapid
increase in cAMP-induced DII activity that was
dose-dependent, with maximal effects noted within 2 h.
Cycloheximide blocked this effect of selenium on restoring cAMP-induced
DII activity, whereas actinomycin D did not. These data demonstrate that the DII selenoenzyme is expressed in cultured astrocytes and that
the induction of DII activity by cAMP analogues appears to be mediated,
at least in part, by pretranslational mechanisms. Furthermore, selenium
deprivation impairs the expression of DII activity at the level of
translation.
U96 INSERM-Unité de Recherche sur la
Glande Thyroïde et la Regulation Hormonale, 80, rue du
Général Leclerc, 94276 Le Kremlin-Bicêtre Cedex,
France and the § Departments of Medicine and Physiology,
Dartmouth Medical School, Lebanon, New Hampshire 03756
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