Alternative energy substrate (None established; not a standard molecular abbreviation.)

The term alternative energy substrate refers broadly to any metabolite that cells utilize for ATP generation when their preferred fuel—typically glucose—is insufficient or unavailable. Common examples include ketone bodies, fatty acids, and sometimes amino acids or lactate. This metabolic flexibility allows tissues such as the heart and brain to maintain function during periods of fasting, intense exercise, starvation, diabetes mellitus, or cardiac dysfunction. In clinical research and therapeutics—especially cardiology—modulating the availability or utilization of these alternative fuels has been explored as a strategy for supporting failing organs like the myocardium. However, "alternative energy substrate" itself does not denote any particular protein target amenable to direct pharmacological intervention—it describes a physiological phenomenon rather than an actionable drug target.

Other names

Alternative metabolic fuelNon-glucose energy sourceSecondary energy substrate

Not applicable for this entry; mechanisms depend on the specific alternative substrate and context.