Energy balance
AMP-activated protein kinase (AMPK) acts as a cellular energy sensor that is activated by metabolic stresses (such as hypoxia, hypoglycemia, or muscle contraction) which increase the AMP:ATP ratio, subsequently switching on catabolic pathways to generate ATP while inhibiting biosynthetic pathways that consume ATP.
Your cells have a built-in energy sensor called AMPK. When you exercise, fast, or experience stress, your energy levels (ATP) drop, causing this sensor to activate. This triggers your body to burn fuel (catabolism) and pause non-essential growth processes (anabolism) to restore energy balance. This is the fundamental biological mechanism behind why exercise and caloric restriction improve metabolic health.
The LKB1→AMPK cascade is switched on by metabolic stresses that either inhibit ATP production (e.g. hypoxia, hypoglycaemia) or that accelerate ATP consumption (e.g. muscle contraction). Any decline in cellular energy status is accompanied by a rise in the cellular AMP : ATP ratio, and this activates AMPK... Once activated by metabolic stress, AMPK activates catabolic pathways that generate ATP, while inhibiting cell growth and biosynthesis and other processes that consume ATP.
Why this rating
This is a foundational review by the discoverers of the AMPK system, citing extensive primary literature.
Source
AMP‐activated protein kinase – development of the energy sensor concept
D. Grahame Hardie et al. · The Journal of Physiology · 2006
DOI 10.1113/jphysiol.2006.108944
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- Exercise activates AMPK in skeletal muscle through mechanisms involving both LKB1-dependent (energy stress) and LKB1-independent (calcium-dependent) pathways, with the degree of activation depending on the intensity and type of exercise relative to the individual's fitness level.Good
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