Impaired hoarding and olfactory learning in DSP-4-treated rats and control cagemates

Area of Science:

• Neuroscience
• Animal Behavior

Background:

• Olfactory preferences and hoarding behavior are crucial for rodent survival and adaptation.
• Neonatal development and social environment can significantly impact neurobiological pathways.

Purpose of the Study:

• To investigate the influence of neonatal noradrenergic depletion and social housing conditions on odor preference and hoarding behavior in rats.
• To determine if early-life stress or neurochemical changes affect olfactory learning and resource accumulation.

Main Methods:

• Neonatal male rats received injections of N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine (DSP-4), a noradrenergic neurotoxin, or vehicle.
• Post-weaning rats were housed in DSP-4-only, control-only, or mixed social groups.
• Rats were exposed to either cedar or pine shavings to assess odor preference and hoarding behavior.

Main Results:

• Exposure to cedar shavings increased odor preference in control-only groups but not in DSP-4-treated or mixed groups.
• Control-only rats exhibited significantly higher hoarding of pellets compared to DSP-4-treated or mixed groups.
• Neonatal noradrenergic depletion and altered social environments impaired olfactory adaptation and hoarding.

Conclusions:

• Both neonatal noradrenergic depletion and abnormal social environments can impair olfactory adaptation and hoarding behavior in rats.
• These findings highlight the critical role of early-life neurochemical balance and social experiences in shaping fundamental behaviors.