Furaneol odor exposure boosts mouse locomotor activity, altering hypothalamic oxytocin/serotonin and amygdala dopamine systems.

The intricate relationship between olfactory stimuli and central nervous system function, particularly regarding mood and activity, remains an active area of research. Environmental cues, including odors, can profoundly influence behavior and physiology, offering potential non-pharmacological avenues for intervention. Understanding how specific volatile compounds modulate neural pathways could lead to novel strategies for managing conditions characterized by altered activity levels or mood. This study investigates furaneol, a common flavor compound, to elucidate its neurophysiological impact on spontaneous locomotor activity (SLA) and associated brain regions, addressing a gap in our knowledge of how sensory input translates into behavioral changes.

Researchers investigated the effects of furaneol odor exposure on mice. Animals were exposed to furaneol for either 15 minutes or 60 minutes. Key endpoints included spontaneous locomotor activity (SLA), dietary intake, and body weight, measured over time. Additionally, mRNA expression patterns in central tissues, specifically the hypothalamus and amygdala, were analyzed to identify neurophysiological changes. The study compared these mRNA expression levels to those induced by exercise, providing a contextual reference for the observed neural responses.

Exposure to furaneol odor for both 15 minutes and 60 minutes significantly increased spontaneous locomotor activity (SLA) in mice. The highest SLA values in both exposure groups were consistently recorded at 3 weeks, followed by a subsequent decline over time. Notably, dietary intake and body weight remained unchanged across all experimental conditions. The study revealed distinct neurophysiological responses depending on exposure duration:

For 15 minutes of furaneol exposure, mRNA expression levels associated with the oxytocin and serotonin system showed significant increases in the hypothalamus, particularly when compared to levels induced by exercise. Concurrently, dopamine receptor expression increased in the amygdala. In contrast, 60 minutes of furaneol exposure resulted in less pronounced changes in these specific neuropeptides and receptors. However, pituitary adenylate cyclase-activating polypeptide (PACAP) expression significantly increased in this longer exposure group, indicating duration-dependent neurophysiological shifts.