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Gluconeogenesis and fasting in cerebral malaria.
H van Thien1, M T Ackermans, G J Weverling
1Bao Loc General Hospital, Lamdong Province, Vietnam.
The Netherlands Journal of Medicine
|July 17, 2004
Summary
In cerebral malaria patients, glucose production significantly decreases during fasting due to reduced gluconeogenesis. This indicates active regulation of glucose metabolism even when glycogenolysis is absent.
Area of Science:
- Metabolic regulation
- Pathophysiology of malaria
Background:
- In healthy individuals, glucose production relies on both glycogenolysis and gluconeogenesis.
- In cerebral malaria, gluconeogenesis is the sole source of glucose production after fasting.
- The impact of prolonged fasting on glucose production in cerebral malaria was previously unknown.
Purpose of the Study:
- To investigate glucose production rates during fasting in patients with cerebral malaria.
- To determine if glucose production decreases when gluconeogenesis is the primary source.
Main Methods:
- Utilized stable isotope ([6,6-2H2]glucose) infusion to measure glucose production.
- Studied seven patients with cerebral malaria after extending a fast.
- Measured glucose production between 20:30 and 00:30 hours.
Main Results:
- Glucose production decreased by approximately 10% in patients with cerebral malaria during the extended fast.
- No significant changes were observed in glucoregulatory hormones, free fatty acids (FFA), or precursor levels.
- The observed decrease was statistically significant (p = 0.05).
Conclusions:
- Glucose production diminishes during fasting in cerebral malaria due to a reduced rate of gluconeogenesis.
- These findings suggest active regulation of glucose production during fasting, independent of glycogen stores.
- The rate of decrease in glucose production mirrors that seen in healthy subjects, highlighting a conserved regulatory mechanism.