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Substrate balances across colonic carcinomas in humans
E Holm1, E Hagmüller, U Staedt
1Department of Pathophysiology, Medical Clinic I Mannheim, Theodor Kutzer Ufer, Germany.
Cancer Research
|March 15, 1995
Summary
Human colon cancers primarily use glucose for energy, releasing lactate. Impaired blood flow in tumors enhances glycolysis, limiting glucose oxidation and glutaminolysis, indicating a valid method for studying tumor metabolism.
Area of Science:
- Oncology
- Human Physiology
- Biochemistry
Background:
- Malignant tumors exhibit altered nutrient utilization compared to normal tissues.
- Understanding tumor metabolism is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate nutrient and amino acid balances across human colonic carcinomas.
- To compare substrate exchange in tumors versus peripheral tissues.
- To validate a method for assessing trans-tumor substrate flux.
Main Methods:
- Assessed substrate balances (energy-yielding, amino acids) in 17 patients during surgery.
- Measured blood flow in colonic carcinomas and peripheral tissues.
- Analyzed arteriovenous differences and venous occlusion plethysmography.
Main Results:
- Tumor blood flow was significantly higher than in peripheral tissues.
- Colonic carcinomas showed substantial net glucose uptake and lactate release.
- Tumors utilized branched-chain amino acids and serine, releasing alanine and ammonia.
Conclusions:
- Human colonic carcinomas predominantly rely on glucose for energy metabolism.
- Impaired tumor perfusion favors glycolysis, limiting glucose oxidation and glutaminolysis.
- The study validates a method for in vivo analysis of metabolic balances in human colonic cancers.