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Cellular and Molecular Neurobiology

, Volume 6, Issue 4, pp 363–379 | Cite as

Electrophysiological actions of somatostatin (SRIF) in hippocampus: Anin vitro study

  • Alan L. Mueller
  • Dennis D. Kunkel
  • Phillip A. Schwartzkroin
Article

Summary

  1. 1.

    The electrophysiological actions of somatostatin (somatotropin release inhibiting factor; SRIF) were investigated in thein vitro hippocampal slice preparation. Intracellular recordings were obtained from pyramidal neurons in area CA1 in slices of hippocampus from guinea pigs and rabbits.

     
  2. 2.

    Somatostatin, applied via micropressure ejection to CA1 pyramidal-cell somata, was primarily excitatory. The effects, however, were quite variable, with nearly all cells displaying pronounced tachyphylaxis. A majority of cells was depolarized by SRIF, but hyperpolarizations or biphasic depolarization/hyperpolarization responses were also recorded. Only minimal conductance changes were associated with the SRIF-induced voltage changes.

     
  3. 3.

    Depletion of SRIF, by injection of the intact animal with cysteamine several hours before preparing slices, resulted in no obvious abnormalities in hippocampal slice electrophysiology.

     
  4. 4.

    Our results obtained with application of exogenous SRIF are consistent with the concept that SRIF acts as an excitatory neurotransmitter/neuromodulator in hippocampus. However, our attempts to demonstrate endogenous SRIF action have thus far been unsuccessful.

     

Key words

somatostatin hippocampal slice excitation local circuit neurons interneurons 

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Copyright information

© Plenum Publishing Corporation 1986

Authors and Affiliations

  • Alan L. Mueller
    • 1
    • 3
  • Dennis D. Kunkel
    • 1
  • Phillip A. Schwartzkroin
    • 1
    • 2
  1. 1.Department of Neurological SurveyUniversity of WashingtonSeattleUSA
  2. 2.Department of Physiology and BiophysicsUniversity of WashingtonSeattleWashington
  3. 3.Department 47H-AP10Abbott LaboratoriesAbbott ParkUSA

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