Overview
Following subcutaneous or intravenous administration, AICAR exhibits rapid cellular uptake via equilibrative nucleoside transporters (ENT1/2). Intracellular phosphorylation to ZMP occurs within minutes; ZMP accumulates to millimolar concentrations sufficient to activate AMPK heterotrimers (α1β1γ1, α2β2γ1, and other isoform combinations) in a tissue-selective manner. Skeletal muscle, liver, and cardiac tissue show prominent AMPK activation. Hepatic AMPK activation suppresses SREBP-1c and ChREBP, reducing de novo lipogenesis and improving hepatic insulin signaling. In skeletal muscle, AICAR-driven AMPK phosphorylates PGC-1α at Thr177 and Ser538, synergizing with SIRT1 deacetylation to transactivate genes encoding OXPHOS components (CYTC, ATP synthase subunits, COXI).
Proposed mechanism
AICAR is taken up by cells and phosphorylated to ZMP (AICA ribonucleotide monophosphate), which directly activates AMP-activated protein kinase (AMPK) by mimicking AMP accumulation — the cell's primary signal of energy depletion. Activated AMPK switches on catabolic pathways (fatty acid oxidation, glycolysis) and suppresses anabolic energy-consuming processes, while also stimulating GLUT4 translocation and upregulating PGC-1α to drive mitochondrial biogenesis. This effectively induces many of the molecular adaptations associated with endurance exercise at the gene expression level.
What the evidence supports
Human data exists but the trials are small, short-term, or not yet replicated.
Graded Human-limited
Human data that exists but is thin: open-label work, single-arm studies, small cohorts, or observational follow-up without randomisation.
Key citations
Representative primary sources, including results that did not favour the compound.
- [1]
AMPK and PPARδ agonists are exercise mimetics
· Cell, 134(3):405-415. doi:10.1016/j.cell.2008.06.051 · 2008
- [2]
AICAR inhibits adipocyte differentiation in 3T3L1 and restores metabolic alterations in diet-induced obesity mice model
· Nutrition & Metabolism, 13:27. doi:10.1186/s12986-016-0086-3 · 2016
- [3]
Acadesine kills chronic myelogenous leukemia (CML) cells through PKC-dependent induction of autophagic cell death
· PLOS ONE, 4(11):e7889 · 2009
- [4]
AMP-activated protein kinase: an energy sensor that regulates all aspects of cell function
· Genes & Development, 26(17):1893-1908. doi:10.1101/gad.183756.111 · 2012
Citation records in this build are illustrative placeholders for the design.
Reference information for research purposes. Not medical advice, and not a recommendation to use any compound. Many entries describe substances that are not approved for human use.