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AICAR

AMP analog used in research to activate AMPK and studied as a potential exercise mimetic in rodents; human benefit is unproven and it is not approved.

Overview

AICAR (5-aminoimidazole-4-carboxamide ribonucleoside; the riboside form is also known as acadesine) is a research compound widely used as an activator of AMP-activated protein kinase (AMPK), a central sensor of cellular energy status. Inside cells it is phosphorylated to a monophosphate (ZMP) that mimics AMP and activates AMPK.

Interest in AICAR as a potential exercise mimetic grew after rodent studies reported endurance-type adaptations such as increased fatty-acid oxidation and mitochondrial biogenesis in skeletal muscle. It is not approved for human use, and its ergogenic value in humans is unproven.

Mechanism

ZMP binds the regulatory (gamma) subunit of AMPK, promoting its phosphorylation and activation. Active AMPK shifts metabolism toward catabolic pathways, stimulating glucose uptake, fatty-acid oxidation, and mitochondrial biogenesis, while suppressing energy-consuming anabolic processes.

Whether chronic AMPK activation can reproduce training adaptations in people remains controversial; human studies have generally not confirmed the robust effects seen in rodents.

Dosing

All published work reflects research or historical clinical contexts. The related compound acadesine was previously tested by intravenous infusion in cardiac-surgery trials as a cardioprotective agent; those studies did not establish any approved use.

  • Rodent exercise-mimetic studies typically used repeated intraperitoneal injections over several weeks
  • Cell-culture work commonly uses sub-millimolar to millimolar concentrations
  • No standard or approved human dosing exists

Expected Effects

  • AMPK activation with downstream phosphorylation of acetyl-CoA carboxylase (ACC)
  • Increased markers of mitochondrial biogenesis and fatty-acid oxidation in rodent muscle
  • Improved running endurance in some mouse studies
  • Human performance benefits remain unproven

Side Effects & Tolerability

Because AMPK regulates metabolism across many tissues, systemic activation could have broad effects. Data from the historical cardiac-surgery trials of acadesine suggest the compound was generally tolerated when infused, but long-term safety and the consequences of chronic AMPK activation have not been established.

Storage

Store the compound dry, cool, and protected from light and moisture. Solutions should be prepared according to the supplier's instructions and used within the stated stability period.

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