The project involved a detailed exploration of stress, motivation, and behavior in mice through a series of focused experiments.
In the first set of studies, the researcher studied natural behavior patterns in mice under various stressors such as elevated platforms and synthetic predator odors. The researcher employed advanced techniques, including precise surgeries and viral infections, to examine how these stressors affected brain activity. The team adopted a virus-based approach, injecting a specific calcium sensor into the BNST, a brain region associated with stress and motivation. The goal was to understand how stressors influenced neural pathways and motivated behavior. This phase also involved refining behavioral protocols and selecting appropriate stressors.
In the second set of studies, the researcher manipulated the GABAergic BNST-VTA pathway, a neural connection linked to stress responses. Through a combination of surgeries and chemogenetic techniques, the researcher activated or inhibited this pathway in mice during motivated behavior tasks. Intriguingly, the researcher found that around 25% of mice exhibited low motivation, unrelated to anxiety. By manipulating specific neurons, researchers enhanced motivation in low performers while reducing it in high performers, providing valuable insights into the neural mechanisms underlying motivation.
In the third set of studies, the researcher investigated the role of endogenous corticotropin-releasing hormone (CRH) in behavioral modulation. By infusing specific compounds into the brain, they studied how CRH influenced motivated behaviors. The team also collected samples to analyze CRH mRNA expression levels, deepening their understanding of the molecular processes involved in stress-related behaviors.
In the operant conditioning task, a quarter of mice exhibited low motivation. Activating specific BNST projection neurons improved motivation in low performers, while inhibiting them reduced motivation in high performers, which suggest the existence of an inverted-U shape regulation of motivated behavior by the circuit under study. Manipulating corticotropin-releasing hormone (CRH) neurons in the BNST influenced motivation levels, demonstrating the intricate interplay between neural pathways and behavior.
This research advances our understanding of stress and motivation, and provides valuable insights into the neural mechanisms underlying these behaviors. These findings have the potential to impact future studies in neuroscience and mental health, offering new avenues for research and therapeutic interventions.
Furthermore, the researcher presented this work and attended several scientific events, including seminars and conferences, such as EBBS meeting in 2021 and BMI Symposia on memory and engaged with the wider scientific community, contributing to the collective understanding of stress, motivation, and behavior.
