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Related Experiment Videos

Central monoamine dysfunction in diabetes: psychotherapeutic implications: electroanalysis by voltammetry.

P A Broderick1, J H Jacoby

  • 1Department of Pharmacology, City University of New York Medical School, NY.

Acta Physiologica Et Pharmacologica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y De La Asociacion Latinoamericana De Farmacologia
|January 1, 1989
PubMed
Summary

Diabetes significantly alters dopamine and serotonin release in rat striatum. Acute diabetes increases both neurotransmitters, while chronic diabetes shows impaired release, suggesting a link to mood changes.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Biochemistry

Background:

  • Diabetes mellitus is a metabolic disorder with known neurological complications.
  • Neurotransmitter systems, particularly dopaminergic and serotonergic pathways in the striatum, are crucial for motor control and mood regulation.
  • Alterations in neurotransmitter release may underlie some of the non-motor symptoms observed in diabetes.

Purpose of the Study:

  • To investigate the in vivo effects of streptozotocin-induced diabetes and hyperglycemia on dopamine and serotonin release in the rat striatum.
  • To examine the impact of L-tryptophan administration on neurotransmitter release in both diabetic and non-diabetic rats.
  • To correlate changes in neurotransmitter availability with potential mood alterations in the diabetic state.

Main Methods:

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  • In vivo voltammetry was employed to measure dopamine and serotonin release in the striatum of rats.
  • Diabetes was induced using streptozotocin (STZ).
  • Hyperglycemia was induced, and L-tryptophan was administered to assess its effects on neurotransmitter release.

Main Results:

  • Acute diabetes increased striatal dopamine (67%) and serotonin (62%) release.
  • Chronic diabetes showed attenuated increases in dopamine (19%) and a return of serotonin release to basal levels.
  • L-tryptophan administration decreased dopamine release and increased serotonin release in non-diabetic rats, but decreased both in long-term diabetic rats.
  • Hyperglycemia in non-diabetic rats decreased dopamine release (52%) and increased serotonin release (304%).

Conclusions:

  • Untreated diabetes is associated with a progressive impairment of striatal dopamine and serotonin release.
  • These neurotransmitter dysregulations may contribute to mood disturbances observed in diabetic individuals.
  • The findings highlight the complex interplay between metabolic status and central neurotransmission.