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Task-induced brain activity patterns in type 2 diabetes: a potential biomarker for cognitive decline
Thomas J Marder1, Veronica L Flores2, Nicolas R Bolo3
1Clinical, Behavioral and Outcomes Research, Joslin Diabetes Center, Boston, MA.
Diabetes
|April 8, 2014
Summary
Middle-aged individuals with type 2 diabetes show altered brain activity during cognitive tasks, including reduced default mode network (DMN) deactivation. These changes may indicate an increased risk for future cognitive decline.
Area of Science:
- Neuroscience
- Endocrinology
- Radiology
Background:
- Type 2 diabetes is linked to cognitive decline.
- Default Mode Network (DMN) dysfunction is observed in type 2 diabetes.
- Task-based neuroimaging reveals abnormalities in populations at risk for cognitive decline.
Purpose of the Study:
- Investigate brain activity patterns during cognitive tasks in middle-aged type 2 diabetic patients.
- Examine default mode network (DMN) deactivation and task-relevant region activation.
- Correlate brain activity with metabolic markers like HbA1c and insulin resistance.
Main Methods:
- Functional magnetic resonance imaging (fMRI) during encoding and recognition tasks.
- Comparison of brain activity between type 2 diabetic patients and control participants.
- Analysis of correlations between brain activity, HbA1c, insulin resistance, and plasma glucose levels.
Main Results:
- Type 2 diabetic patients exhibited reduced dorsolateral prefrontal cortex activation during encoding.
- Impaired DMN deactivation was observed during recognition in type 2 diabetic patients.
- Task-related activation correlated positively with HbA1c and insulin resistance; hyperglycemia was linked to impaired DMN deactivation.
Conclusions:
- Middle-aged type 2 diabetic patients display abnormal brain activity patterns during cognitive tasks, even with normal cognition.
- These task-induced brain alterations may serve as early indicators of cognitive decline.
- Metabolic dysregulation in type 2 diabetes impacts neural responses to cognitive challenges.
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