Alternative fuel source

The term 'Alternative fuel source' does not refer to a specific biological target, such as a receptor, enzyme, or transporter. Instead, it is a general physiological concept describing metabolic substrates other than glucose—primarily ketone bodies, fatty acids, and lactate—that the body utilizes for energy production during periods of starvation, intense exercise, or specific disease states. In oncology, 'alternative fuel sources' often refers to the ability of cancer cells to utilize glutamine or acetate to survive in nutrient-depleted microenvironments. In neurology, it frequently pertains to the use of ketones as a neuroprotective energy supply when glucose metabolism is impaired, as seen in Alzheimer's disease. Because this term encompasses a wide range of disparate molecules and metabolic pathways rather than a single molecular entity, it is not considered a valid canonical therapeutic target for drug development. Research typically focuses on specific targets within these pathways, such as monocarboxylate transporters (MCTs) or enzymes like 3-hydroxybutyrate dehydrogenase.

Other names

Alternative energy sourceMetabolic fuelNon-glucose substrate

Not applicable as this is a conceptual category of metabolic substrates rather than a specific druggable protein or receptor.