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Related Experiment Videos

Somatostatin receptors.

K Raynor1, T Reisine

  • 1Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia 19104.

Critical Reviews in Neurobiology
|January 1, 1992
PubMed
Summary

The neuropeptide somatostatin (SRIF) influences brain functions via distinct receptor subtypes. SRIF1 receptors mediate motor activity, while SRIF2 receptors

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Somatostatin (SRIF) is a neuropeptide neurotransmitter in the brain.
  • SRIF modulates ion conductances, neuronal firing, neurotransmitter release, and behaviors.
  • SRIF exerts effects through cell surface receptors, with subtypes identified in the brain.

Purpose of the Study:

  • To characterize distinct somatostatin receptor subtypes (SRIF1 and SRIF2) in the brain.
  • To investigate the functional roles and distribution of these receptor subtypes.

Main Methods:

  • Pharmacological characterization using agonists like MK 678 and CGP 23996 analogs.
  • Analysis of receptor coupling to G proteins.
  • Mapping of receptor distribution in brain regions.

Main Results:

  • SRIF1 receptors bind MK 678, couple to G proteins, and mediate SRIF-stimulated K+ currents and locomotor activity.
  • SRIF1 receptors are abundant in the hippocampus, locus coeruleus, neostriatum, and cerebral cortex.
  • SRIF2 receptors do not bind MK 678, have distinct labeling properties, are less coupled to G proteins, and have overlapping brain distribution with SRIF1 receptors.

Conclusions:

  • SRIF1 receptors are functionally linked to specific neuronal excitability and behavioral responses.
  • SRIF2 receptors represent a distinct subtype with currently undefined biological functions.
  • Understanding these receptor subtypes is crucial for deciphering somatostatin's role in brain function.

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