Related Experiment Videos
A potential error in modifications of the [14C]2-deoxyglucose technique
Brain Research
|January 31, 1983
Summary
Modified [14C]2-deoxyglucose methods for measuring brain glucose use may be inaccurate. Unphosphorylated 2-deoxyglucose can account for significant radioactivity, introducing errors not present in the original Sokoloff technique.
Area of Science:
- Neuroscience
- Biochemistry
- Medical Imaging
Background:
- The [14C]2-deoxyglucose technique is widely used to measure local cerebral glucose utilization.
- Several modifications exist, often simplifying the original method.
Purpose of the Study:
- To validate a key assumption in modified [14C]2-deoxyglucose techniques.
- To assess the proportion of unphosphorylated 2-deoxyglucose in the central nervous system (CNS).
Main Methods:
- Utilized the Sokoloff kinetic model.
- Analyzed arterial plasma [14C]2-deoxyglucose and glucose levels over time.
- Calculated the proportion of total CNS radioactivity as unphosphorylated 2-deoxyglucose.
Main Results:
- Unphosphorylated 2-deoxyglucose constituted 5-50% of total CNS radioactivity.
- This proportion varied based on glucose utilization rate, time to sacrifice, isotope administration route, and plasma glucose levels.
Conclusions:
- Modifications to the [14C]2-deoxyglucose technique can introduce significant errors.
- These errors stem from the presence of unphosphorylated 2-deoxyglucose, unlike the original Sokoloff method.