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Related Experiment Videos

Selective breeding for increased cholinergic function: increased serotonergic sensitivity.

E Wallis1, D H Overstreet, A D Crocker

  • 1School of Biological Sciences, Flinders University of South Australia, Bedford Park.

Pharmacology, Biochemistry, and Behavior
|October 1, 1988
PubMed
Summary

Rats bred for higher cholinergic function show altered responses to serotonin drugs. These findings suggest interactions between cholinergic and serotonergic systems in the brain.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Selective breeding can create distinct animal models for studying neurochemical systems.
  • Cholinergic and serotonergic systems are known to interact and influence various physiological and behavioral processes.

Purpose of the Study:

  • To investigate the effects of serotonergic drugs on body temperature and behavior in rats selectively bred for cholinergic sensitivity.
  • To explore potential interactions between cholinergic and serotonergic systems.

Main Methods:

  • Administered serotonergic antagonist cyproheptadine and agonist 1-(m-chlorophenyl) piperazine (mCPP) to two rat lines (Flinders Sensitive Line and control).
  • Measured core body temperature, locomotor activity, and operant responding for water reward.

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  • Assessed sensitivity to muscarinic agonist oxotremorine.

    • Main Results:

    • Both cyproheptadine and mCPP caused dose-dependent hypothermia, more pronounced in the Flinders Sensitive Line (FSL) rats.
    • Cyproheptadine's stimulant effects were similar across lines, but mCPP's inhibitory effects were greater in FSL rats.
    • FSL rats were more sensitive to oxotremorine-induced hypothermia, which cyproheptadine partially attenuated.

    Conclusions:

    • Rats selectively bred for increased cholinergic function (FSL) exhibit altered sensitivity to serotonergic agents.
    • Findings support the hypothesis of significant cholinergic-serotonergic interactions influencing thermoregulation and behavior.