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Water deprivation changes naloxone binding in the rat brain
M Mori1, H Ishihara, T Iriuchijima
1First Department of Internal Medicine, Gunma University School of Medicine, Maebashi, Japan.
Neuroendocrinology
|April 1, 1988
Summary
Water deprivation in rats significantly reduced naloxone binding in the striatum, indicating a link between thirst and brain opioid receptors. Food deprivation did not affect these opioid receptors.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Addiction Research
Background:
- Opioid receptors play a role in reward and motivation, potentially influencing drinking behaviors.
- Understanding the neurobiological underpinnings of thirst and its relation to the brain's reward system is crucial.
Purpose of the Study:
- To investigate the relationship between water deprivation (thirst) and brain opioid receptor binding.
- To determine if food deprivation affects opioid receptor binding similarly.
Main Methods:
- Utilized naloxone, a mu-opioid receptor antagonist, to measure opioid receptor binding in water-deprived rats.
- Compared binding in various brain regions (striatum, hypothalamus, midbrain) after 48-hour water deprivation versus food deprivation.
Main Results:
- Water deprivation significantly decreased naloxone binding in the striatum, but not other brain regions.
- Striatal naloxone binding decreased progressively with the duration of water deprivation (0-48 hours).
- Food deprivation did not alter naloxone binding in any tested brain regions.
Conclusions:
- Changes in striatal opioid receptors are specifically associated with the sensation of thirst in rats.
- The brain's opioid system may be involved in the motivational aspects of water seeking and consumption.