Exploration of sex differences in Rhes effects in dopamine mediated behaviors

Area of Science:

• Neuroscience
• Molecular Biology
• Behavioral Science

Background:

• Ras homolog enriched in striatum (Rhes) proteins are highly expressed in dopaminergically innervated brain regions.
• Understanding Rhes's role in neurological functions is crucial for central nervous system research.

Purpose of the Study:

• To investigate the impact of Rhes protein levels on activity, anxiety, and stereotypy.
• To explore sex-dependent differences in Rhes's effects on these behaviors.

Main Methods:

• Utilized Rhes mutant mice (Wild type, Rhes KO, Rhes Heterozygous) of both sexes.
• Assessed basal activity and anxiety using the open field test over five days.
• Evaluated apomorphine-induced stereotypy to measure dopamine receptor function.

Main Results:

• Rhes protein levels significantly affected basal locomotion but showed no sex-related differences.
• A decrease in Rhes levels exhibited a trend towards anxiolytic effects, more pronounced in female mice.
• Rhes protein levels did not alter dopamine D(1) and D(2) receptor synergism in either sex.

Conclusions:

• Rhes protein levels modulate locomotion and influence anxiety in a sex-dependent manner.
• Rhes does not appear to affect dopamine D(1)/D(2) receptor synergism.
• These findings highlight Rhes's complex role in regulating behavior within the central nervous system.