In this series, we are going to highlight the different publications from the PsyCoMed partners, in a more accessible version for the general public.
For this fifth edition, let’s have a look at this article published by our colleagues from Jagiellonian Uniwersytet (Poland) entitled «Early-life adversity alters adult nucleus incertus neurons: implications for neuronal mechanisms of increased stress and compulsive behavior vulnerability». This article is available here: https://www.nature.com/articles/s41386-025-02089-0
Early-life stress disrupts brain development and increases the risk of psychological disorders
According to this study, intense stress during childhood (such as physical or emotional abuse) can disrupt normal brain development and deregulate the stress management system (known as the hypothalamic-pituitary-adrenal axis). This increases the risk, in adulthood, of psychological disorders (depression, anxiety, etc.) and compulsive behaviors (addictions, OCD, etc.).
But how?
Researchers focused on a brain region highly sensitive to stress: the nucleus incertus (NI), which is involved in stress responses and reward-seeking behaviors (food, alcohol, etc.). Until now, it was unknown whether this area was affected by early-life stress.
The experiment: In rats, scientists replicated early-life stress (separation from the mother at birth) and observed its effects on the NI in adulthood. The results showed:
- NI neurons respond less effectively to acute stress.
- Their structure is altered (reduction in nerve branches).
- Communication between cells is disrupted.
- Certain stress and addiction markers are overexpressed.
In summary: Early-life stress permanently alters the functioning of the nucleus incertus, which could explain why individuals who experienced early trauma are more vulnerable to stress and addiction later in life.
Why is this important? This opens avenues for better understanding—and potentially better treating—the long-term consequences of early-life trauma.