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Thyroid function in hemidecorticate rats.

C O Munhoz1, D O Tosello, G A Fernandez

  • 1Departamento de Morfologia, Faculdade de Odontologia de Piracicaba, Universidade Estadual de Campinas, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 1, 1988
PubMed
Summary

Hemidecortication in rats led to mild hypothyroidism, evidenced by lower thyroxine (T4) levels and reduced growth of incisors and mandibles. Thyroid function showed reduced thyroglobulin breakdown but normal biosynthesis.

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Comparative Physiology

Background:

  • Thyroid hormones regulate metabolism and growth.
  • Hemidecortication is a surgical procedure affecting brain function.
  • The impact of hemidecortication on thyroid function is not well-established.

Purpose of the Study:

  • To investigate the effects of hemidecortication on thyroid hormone levels and function in rats.
  • To assess the impact of hemidecortication on the development of incisors and mandibles.

Main Methods:

  • Serum T3 and T4 levels were measured.
  • Thyroid gland histology (follicle size, colloid droplets) was analyzed.
  • [3H]-glycine uptake assessed thyroglobulin biosynthesis.
  • Incisor and mandible growth (weight, length) were quantified.

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Main Results:

  • Hemidecorticate rats had normal T3 but significantly lower T4 levels.
  • Thyroid glands showed slight atrophy and reduced colloid droplets, indicating decreased thyroglobulin breakdown.
  • Thyroglobulin biosynthesis remained unaltered.
  • Mandible weight and incisor weight/length were reduced in hemidecorticate rats.

Conclusions:

  • Hemidecortication induces mild hypothyroidism, likely of a trophoprivic nature.
  • Hypothalamic dysfunction secondary to hemidecortication may underlie the observed thyroid changes.
  • These findings highlight a link between central nervous system alterations and peripheral endocrine function.