Schizophrenia’s lost brain connections follow a surprising pattern
Specialized brain scans reveal that schizophrenia is linked to widespread loss of the synapses that connect brain cells, with the left side of the brain hit especially hard. The damage follows a surprisingly organized pattern tied to the brain’s chemistry and wiring. Researchers also identified a left frontal region that may serve as a starting point for the loss.
A Rutgers-led study has uncovered a surprising pattern in the biological changes linked to schizophrenia, revealing that synaptic connections in the living human brain are disproportionately affected in specific regions. The research, detailed in Molecular Psychiatry, employed positron emission tomography (PET) imaging to measure synaptic connections, a technique that conventional imaging methods like MRI cannot perform.
The study, involving 122 individuals, including 29 with schizophrenia, is one of the largest synaptic density PET imaging studies conducted. Compared to healthy participants, those with schizophrenia exhibited a significant and widespread reduction in synaptic connections across several brain areas, including frontal and temporal regions, as well as memory and emotion-related areas.
This synaptic pattern diverged from the changes in brain volume typically observed with standard MRI scans, indicating that synaptic loss and brain volume alterations may represent distinct biological processes. The team also discovered that the brain regions displaying the most synaptic losses contained high concentrations of receptors for neurotransmitters such as serotonin, gamma-aminobutyric acid, and glutamate.
This suggests that the molecular characteristics of individual brain regions may influence their vulnerability to schizophrenia-associated changes. The researchers utilized computer simulations based on the brain's structural connections to identify an area in the left frontal lobe as a likely starting point for synaptic loss to spread to connected regions.
Dr. Sidhant Chopra, the study's first author, emphasized that these findings suggest schizophrenia-related synaptic loss is not random but follows the brain's molecular and connectivity architecture. This detailed mapping of synaptic vulnerability could pave the way for developing targeted therapies to prevent or restore brain function, potentially leading to more effective and personalized schizophrenia treatments.
Further research will explore how synaptic loss changes over time and responds to clinical treatments, with the ultimate goal of improving schizophrenia care.
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