Ovariectomy and gonadal hormone treatment: Effects on insulin-like growth factor-1 receptors in the rat brain

Nahid K. El-Bakri, Atiqul Islam, Isam Suliman, Urban Lindgren, Bengt Winblad, Abdu Adem

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Various studies demonstrate that estradiol regulates structure and function of adult neurons. Long-term effect of estradiol in terms of neuroprotection is less documented compared to short-term one. It is well documented that estradiol interacts with insulin-like growth factor-1 (IGF-I) in the brain. The present study examines the effect of ovariectomy and two doses of ovarian hormone treatment on IGF-I receptor density in the adult rat by receptor autoradiography using 125I-IGF-I as a ligand. Our result showed that ovariectomy decreased IGF-I receptor density in hippocampus, hypothalamus and parietal cortex compared to that of the sham-operated group. Treatment with low or high dose estrogen restored IGF-I receptor density to the control levels in nearly all areas studied in this investigation. It seems that low dose estrogen has more pronounced effect than the high dose in restoring IGF-I receptor density. On the other hand, progesterone treatment in high but not in low dose restored IGF-I receptor density to that of the control. These results demonstrate that both estrogen and progesterone significantly affects IGF-I receptor density in different areas of the brain. These effects indicate a dose-dependent modulator effect of ovarian hormones on IGF-I activity in the brain.

Original languageEnglish
Pages (from-to)388-393
Number of pages6
JournalGrowth Hormone and IGF Research
Volume14
Issue number5
DOIs
Publication statusPublished - Oct 2004

Keywords

  • Autoradiography
  • Estrogen
  • IGF-I receptors
  • Ovariectomy
  • Progesterone
  • Radioimmunoassay

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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