Summary: New research shows that aggression and self-harm can share a biological basis rooted in how the brain responds to early-life trauma. The study found that trauma increases activity of specific calcium channels within a neural circuit connecting the thalamic nucleus reuniens and the hippocampus, intensifying pain signaling and impulsive behaviors.
This hyperactivation makes individuals more likely to engage in self-injury or aggressive outbursts later in life. By identifying a mechanistic link between trauma, heightened pain processing, and maladaptive actions, the findings point toward more precise targets for treating trauma-related disorders.
Key Facts
- Shared Circuit: Early-life trauma overactivates a pathway linking the nucleus reuniens and the hippocampus.
- Calcium Channel Role: Increased activity of L-type calcium channels in that pathway contributes to vulnerability to both aggression and self-harm.
- Pain Connection: Altered processing of emotional and physical pain appears to facilitate the emergence of these behaviors.
Source: Virginia Tech
Aggression and self-harm frequently co-occur in people who experienced early-life trauma—a relationship that has largely been documented through clinical observations and self-reported histories.
Clinical data show that individuals treated for self-inflicted injuries are considerably more likely to engage in excessive aggression. This raises a core question: what changes in the brain tie these two behaviors together?
Sora Shin, an assistant professor at the Fralin Biomedical Research Institute’s Center for Neurobiology Research, led a new study that pinpoints a neural circuit altered by early trauma. The paper was published Nov. 5 in Science Advances.
“Our results suggest that aggression and self-harm, while behaviorally distinct, can arise from a common neural mechanism,” Shin said. “Both behaviors may exist along a continuum shaped by how the brain processes pain.”
Shin’s lab studies how childhood adversity reconfigures brain function and molecular signaling, producing maladaptive adult behaviors. Earlier work from the team explored links between early trauma, binge eating, and stress-related eating patterns.
Seeking the roots of aggression and self-harm, Shin asked whether anxiety or depression alone explained these outcomes, or whether deeper alterations—specifically in pain processing—were involved.
Using mouse models, the researchers found that early-life trauma and increased activity of a particular L-type calcium channel in neurons along the thalamo-hippocampal pathway elevate the risk of impulsive aggression and self-injurious behavior.
The nucleus reuniens (RE) serves as a critical connection between the prefrontal cortex and the hippocampus and plays roles in memory, emotion, and decision-making. Dysregulation of this region has been linked to impulsivity and anxiety-related behaviors.
Shin’s team identified LTCC-expressing neurons in the RE as key regulators of these maladaptive outcomes. Trauma increased LTCC activity in vesicular glutamate transporter 2 (vGlut2)–expressing RE neurons, producing persistent neuronal activation and higher susceptibility to aggression and self-harm.
Specifically, activation of vGlut2 RE neurons projecting to the ventral hippocampus (vCA1) promoted these behaviors in control mice, whereas projections to the medial prefrontal cortex did not have the same effect. The study further showed that RE neurons influence two distinct subsets of vCA1 neurons: one set projects to the hypothalamus and is implicated in driving aggression, while another projects to the basal amygdala and is linked to self-harm.
“Trauma increases channel activity and changes the molecular and electrophysiological properties of these neurons,” Shin said. “This hyperactivation in the RE–vCA1 circuit appears to heighten vulnerability to both aggression and self-injury.”
The researchers also highlight the role of pain—both physical and emotional—as a potential gateway for these behaviors. By establishing a biological pathway that connects early adversity, altered pain processing, and maladaptive actions, the study moves beyond subjective reporting to reveal concrete neural targets for intervention.
“Pathological aggression and self-harm are serious public-health concerns with far-reaching consequences,” Shin said. “Our findings offer mechanistic insight into their neural origins and may help guide the development of more effective, targeted therapies.”
Michael Friedlander, executive director of the Fralin Biomedical Research Institute and Virginia Tech’s vice president for Health Sciences and Technology, praised the work for combining technological innovation with conceptual advances to address complex health challenges.
Funding: The study was supported by grants from the National Institute of Mental Health (part of the NIH), the FBRI Seale Innovation Fund, the Integrated Translational Health Research Institute of Virginia, and a postdoctoral fellowship from the South Korean government.
Other contributors include Jane Jung, postdoctoral associate in Shin’s lab, and former research associate In-Jee You.
Key Questions Answered:
A: The study shows both behaviors can arise from the same neural pathway that becomes overactive after early-life trauma, indicating similar disruptions in how the brain processes pain.
A: The pathway between the nucleus reuniens and the ventral hippocampus (vCA1) is central: trauma increases L-type calcium channel activity in RE neurons projecting to vCA1, driving behavioral risk.
A: Identifying the neurobiological roots of these behaviors enables researchers to move beyond self-report and develop targeted interventions that address the specific brain dysfunctions caused by early trauma.
About this trauma, aggression, and self-harm research news
Author: John Pastor
Source: Virginia Tech
Contact: John Pastor – Virginia Tech
Image: The image is credited to Neuroscience News
Original Research: Closed access. “Thalamo-hippocampal pathway determines aggression and self-harm” by Sora Shin et al. Science Advances. DOI: 10.1126/sciadv.ady5540
Abstract
Thalamo-hippocampal pathway determines aggression and self-harm
Aggression and self-harm are maladaptive coping strategies that frequently follow early-life trauma (ELT), but the neural mechanisms linking ELT to these behaviors have been unclear. This study identifies the L-type calcium channel (LTCC)–expressing thalamic nucleus reuniens (RE) as a critical regulator of both outcomes. ELT induces excessive LTCC activity in vesicular glutamate transporter 2 (vGlut2)–expressing RE neurons, producing persistent neuronal activation that increases susceptibility to aggression and self-harm. Activation of vGlut2 RE neurons projecting to the ventral hippocampus (vCA1), but not to the medial prefrontal cortex, promoted these behaviors in control mice. Moreover, RE neurons differentially target two vCA1 subpopulations: one projecting to the hypothalamus to drive aggression and another projecting to the basal amygdala to mediate self-harm. These findings reveal how LTCC-driven hyperactivity in the RE–vCA1 pathway raises the risk of aggression and self-harm, highlighting potential targets for interventions to reduce destructive behaviors following early adversity.