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Related Experiment Videos

Somatostatin receptors in the developing rat brain

V S Thoss1, D Duc, D Hoyer

  • 1Preclinical Research, Sandoz Pharma Ltd., Basel, Switzerland.

European Journal of Pharmacology
|February 15, 1996
PubMed
Summary

This study mapped somatostatin receptor (SRIF) binding sites and receptor mRNA in developing rat brains. Most SRIF receptor subtypes are present before birth but show distinct developmental trajectories.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pharmacology

Background:

  • Somatostatin receptors (SRIF) play crucial roles in brain function.
  • Understanding their developmental expression is key to comprehending neurodevelopmental processes.

Purpose of the Study:

  • To investigate the distribution and developmental changes of somatostatin receptor subtypes in the rat brain.
  • To correlate receptor binding patterns with the expression of somatostatin receptor messenger RNA (mRNA).

Main Methods:

  • Autoradiography was used to map the binding sites of radiolabeled ligands: [125I]SRIF-28, [125I]204-090, and [125I]CGP 23996.
  • In situ hybridization was employed to study the mRNA expression of somatostatin receptors (SSTR1-5).
  • Analyses were conducted at embryonic day 18 (E 18) and postnatal day 5 (P 5) in rat brains.

Main Results:

  • Distinct, though partially overlapping, distribution patterns were observed for the three radioligands.
  • Receptor binding generally increased from E 18 to P 5, with a less pronounced increase for [125I]204-090.
  • [125I]204-090 binding correlated with sst2 receptor mRNA distribution, while [125I]CGP 23996 binding did not correlate with any single receptor mRNA.
  • The distribution of [125I]SRIF-28 binding sites showed a different pattern compared to individual receptor mRNAs.

Conclusions:

  • Most somatostatin receptor subtypes are expressed in the rat brain by embryonic day 18.
  • These receptor subtypes exhibit differential developmental patterns postnatally.
  • The findings highlight the complex developmental regulation of somatostatin receptor systems in the brain.

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