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Related Experiment Videos

Retinoic acid reverses the PTU related decrease in neurogranin level in mice brain.

V Enderlin1, J Vallortigara, S Alfos

  • 1Unité de Nutrition et Signalisation Cellulaire (E.A. MENRT; USC INRA) ISTAB, Université Bordeaux 1, Avenue des Facultés, 33405 Talence cedex, France. v.enderlin@istab.u-bordeaux1.fr

Journal of Physiology and Biochemistry
|February 11, 2005
PubMed
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Retinoic acid (RA) and thyroid hormone (T3) signaling are crucial for brain function in aging mice. Mild hypothyroidism affects RA

Area of Science:

  • Neuroscience
  • Endocrinology
  • Molecular Biology

Background:

  • Retinoid signaling is vital for brain function in aging mice.
  • Thyroid hormone signaling may impede retinoic acid's (RA) effects.
  • Mild hypothyroidism is common in the elderly.

Purpose of the Study:

  • To investigate if RA exerts neurological effects in mild hypothyroidism.
  • To understand the interplay between RA and thyroid hormone signaling in aging.

Main Methods:

  • Mice were given propylthiouracil (PTU) to induce mild hypothyroidism.
  • Quantitative analysis of RA receptors (RAR, RXR), T3 receptor (TR), and neurogranin (RC3) was performed.
  • Mice received vehicle, RA, or T3 treatment.

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Main Results:

  • PTU-induced decrease in RAR, RXR, and RC3 expression was reversed by RA or T3.
  • TR mRNA levels, unaffected by PTU, increased only after T3 administration.
  • These findings mirror observations in aged mice.

Conclusions:

  • Neurobiological changes in aging mice may stem from altered RA and T3 signaling.
  • Mild thyroid function changes contribute to these signaling pathway modifications.
  • RA and T3 signaling are interconnected in maintaining brain function during aging.