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Self-stimulation from the mesencephalon following intraventricular interleukin-2 administration
A L Hebb1, R M Zacharko, H Anisman
1Institute of Neuroscience, Carleton University, Ottawa, Ontario, Canada.
Brain Research Bulletin
|May 5, 1998
Summary
Interleukin-2 (IL-2) administration in the brain reduced the reward value of self-stimulation in the dorsal VTA region of mice. This effect on brain reward pathways was specific to the dorsal area, not the ventral.
Area of Science:
- Neuroscience
- Immunology
- Behavioral Science
Background:
- The ventral tegmental area (VTA) is a key brain region involved in reward and motivation.
- Interleukin-2 (IL-2) is a cytokine with known roles in immune responses and potential central nervous system effects.
Purpose of the Study:
- To investigate the effects of central Interleukin-2 (IL-2) administration on intracranial self-stimulation (ICSS) in mice.
- To determine if IL-2 differentially affects reward processing in subregions of the VTA.
Main Methods:
- Mice (CD-1) were trained to respond for brain stimulation from dorsal or ventral aspects of the VTA.
- Intraventricular administration of IL-2 (5 ng) or vehicle was performed.
- ICSS response frequency was measured at various time points post-administration.
Main Results:
- Intraventricular IL-2 administration significantly increased the stimulation frequency needed for half-maximal responding in the dorsal A10 region of the VTA.
- This effect was observed 15 minutes, 24 hours, 48 hours, and 1 week after IL-2 administration.
- IL-2 did not affect responding for brain stimulation from the ventral A10 area.
Conclusions:
- Central IL-2 administration selectively reduces the rewarding value of brain stimulation from dorsal VTA subregions.
- These findings suggest that IL-2 can modulate reward circuitry in the brain, with region-specific effects.
- The results have implications for understanding the role of cytokines in behavioral pathology.