Unlocking the Brain’s Secrets: New Study Identifies Network Linked to Schizophrenia
Researchers at Mass General Brigham have made a groundbreaking discovery: a unique brain network that links to the varied patterns of brain atrophy, or shrinkage, associated with schizophrenia. By combining neuroimaging data from multiple studies involving over 8,000 participants, the team identified a specific connectivity pattern of atrophy present across different stages and symptoms of schizophrenia, distinguishing it from networks linked to other psychiatric disorders.
A Common Thread Across Schizophrenia
“We looked for common threads among reports on how schizophrenia affects the brain,” said corresponding author Ahmed T. Makhlouf, MD, of the Center for Brain Circuit Therapeutics and medical director of the Brigham and Women’s Hospital Psychosis Program. “We found that there’s atrophy in places all over the brain, but they’re all connected to a single network.”
Despite extensive research, understanding the exact circuits in the brain affected by schizophrenia has been challenging due to varying results and different methodologies. This new study took a unique approach, aiming to paint a more comprehensive picture of the neurological changes associated with schizophrenia.
Reconstructing the “Elephant” of Brain Atrophy
“One explanation could be that everyone’s actually looking at the same thing from a different vantage point,” explained senior author Shan H. Siddiqi, MD, a psychiatrist at the Brigham’s Center for Brain Circuit Therapeutics. “If multiple people try to feel different parts of an elephant with their eyes closed, they’re going to describe different things. Our approach with this study was to try to reconstruct the elephant.”
The researchers analyzed data from 90 studies encompassing 1,636 patients with recently diagnosed schizophrenia, 2,120 individuals with chronic schizophrenia, and over 6,000 healthy individuals. They also examined data from individuals at genetic or clinical high risk of developing schizophrenia, providing a more complete understanding of the progression of the disorder.
By combining the widespread locations of atrophy in schizophrenia, the team created a common brain map. They then utilized coordinate network mapping (CNM) to analyze the overlap between atrophy locations and functional brain networks. The resulting map highlighted brain regions linked to schizophrenia, including the bilateral insula, hippocampus, and fusiform cortex.
Importantly, the researchers found that this network differed from those observed in other conditions like Alzheimer’s disease, major depressive disorder, and substance use disorders, suggesting its specificity to schizophrenia.
Implications for Diagnosis and Treatment
This discovery has significant implications for understanding, diagnosing, and treating schizophrenia. The network, found to be similar across patients with various symptoms and stages of the disorder, remains consistent even with antipsychotic treatment. Notably, individuals at high risk of developing schizophrenia also showed similarities in atrophy patterns, highlighting the potential for early intervention.
“There is a debate in the field as to whether or not schizophrenia is a neurodegenerative disorder,” said Makhlouf. “Our study indicates that there is a unique and unified network that might be a core characteristic of schizophrenia.”
The research team is planning a clinical trial that will use transcranial magnetic stimulation to assess connectivity of stimulation sites to the identified schizophrenia network. This could pave the way for new therapies that target this specific network.
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