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Summary
Animals utilize various glucose fermentation pathways when oxygen is limited, impacting energy production and proton balance. These pathways offer adaptable strategies for managing proton accumulation during carbohydrate metabolism, particularly in conditions like endotoxin shock.
Area of Science:
- Biochemistry
- Cellular Metabolism
- Physiology
Background:
- Animals employ diverse metabolic pathways for glucose fermentation under oxygen-limiting conditions.
- Fermentation pathways vary in energetic efficiency and end-product generation (e.g., lactate, succinate, propionate).
Purpose of the Study:
- To investigate the proton (H+) balance during different glucose fermentation pathways.
- To explore the potential impact and functions of net H+ accumulation in carbohydrate metabolism during endotoxin shock.
Main Methods:
- Analysis of proton production stoichiometry across various fermentation pathways.
- Comparison of adenosine triphosphate (ATP) turnover relative to proton production.
Main Results:
- All fermentation pathways generate two moles of protons per mole of fermentable substrate.
- Succinate and propionate fermentations allow for two and three times greater ATP turnover per mole of protons, respectively, compared to lactate fermentation.
- Certain alcohol fermentations achieve a proton balance similar to aerobic metabolism.
Conclusions:
- Proton balance during anaerobic metabolism is adaptable.
- Net H+ accumulation during carbohydrate metabolism may have significant functions, especially in endotoxin shock.