Down's syndrome in adults: brain metabolism

Area of Science:

• Neuroscience
• Genetics
• Medical Imaging

Background:

• Down's syndrome, also known as trisomy 21, is a genetic disorder associated with various physiological changes.
• Cerebral glucose metabolism is a key indicator of brain function and health.
• Previous research has not fully elucidated the metabolic profile of the brain in individuals with Down's syndrome across different age groups.

Purpose of the Study:

• To investigate and compare the cerebral metabolic rate for glucose in young adults with Down's syndrome and healthy controls.
• To examine how cerebral glucose utilization changes with age in individuals with Down's syndrome.

Main Methods:

• Utilized positron emission tomography (PET) scanning.
• Employed fluorine-18-labeled 2-deoxy-D-glucose (FDG) as a tracer to measure glucose metabolism.
• Compared metabolic rates between young adults with Down's syndrome, healthy young controls, and an older individual with Down's syndrome.

Main Results:

• Young subjects with Down's syndrome showed a significantly higher cerebral metabolic rate for glucose compared to healthy young controls.
• In an older individual with Down's syndrome, cerebral glucose utilization in the frontal lobe was significantly lower than in younger subjects with the condition.
• The frontal lobe glucose utilization in the older Down's syndrome subject approximated that of middle-aged controls.

Conclusions:

• Cerebral glucose utilization appears to be elevated in young adults with Down's syndrome.
• Brain glucose metabolism may decline in specific regions with advancing age in individuals with Down's syndrome.
• These findings suggest age-related alterations in brain energy metabolism in Down's syndrome.