Original Aicar

Definition and Core Mechanism of Original AICAR

Original AICAR (Aminoimidazole carboxamide ribonucleotide, also known as Acadesine or ZMP precursor) is an analog of adenosine monophosphate (AMP) designed strictly for laboratory research use. It acts as a direct, cell-permeable activator of AMP-activated protein kinase (AMPK), allowing researchers to investigate metabolic signaling pathways, intracellular ATP regulation, mitochondrial biogenesis, and cellular lipid oxidation in vitro and in animal models.

In physiological and biochemical research setups, cellular energy status is monitored through the AMP:ATP ratio. When metabolic stress depletes ATP, elevated levels of endogenous AMP bind to the gamma subunit of AMPK, triggering a conformational change that promotes phosphorylation at Threonine-172 (Thr172) on the alpha catalytic subunit. Original AICAR bypasses upstream signaling cascades by rapidly crossing cell membranes and undergoing intracellular conversion by adenosine kinase into ZMP (5-aminoimidazole-4-carboxamide ribonucleotide). ZMP acts as an AMP mimetic, directly binding to the regulatory subunits of AMPK to induce allosteric activation without disturbing physiological ATP concentrations.

Researchers evaluating high-purity metabolic regulators can explore our reference catalog of all research peptides and specialized Small Molecule compounds to source analytical-grade reagents for cellular signaling experiments.

Chemical Identifiers and Molecular Properties

To ensure precise experimental replication, laboratory investigators must confirm the chemical identity and structural specifications of original AICAR prior to assay integration. The compound possesses the molecular formula C9H15N5O8P in its phosphorylated active form (ZMP) or C9H14N4O5 in its nucleoside form (Acadesine), with a molecular weight of 258.23 g/mol (free base form).

Chemically designated as 5-amino-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]imidazole-4-carboxamide, AICAR presents as a white to off-white crystalline powder. It exhibits high solubility in aqueous buffer systems, rendering it an adaptable reagent for cell culture administration and enzymatic assays. When procuring from PX1 Research, each batch of AICAR research powder undergoes stringent testing to verify structural identity, molecular weight, and absence of synthetic contaminants.

Preclinical Applications: AMPK Activation and Metabolic Pathways

In preclinical laboratory settings, original AICAR serves as the standard pharmacological tool for evaluating the metabolic consequences of AMPK activation. In vitro data indicate that AICAR-mediated AMPK phosphorylation downregulates energy-consuming anabolic processes, such as fatty acid synthesis and protein translation, while simultaneously upregulating ATP-generating catabolic pathways.

Rodent and cell culture models demonstrate that AICAR administration enhances the expression of Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), a master regulator of mitochondrial biogenesis. Preclinical studies suggest that sustained AMPK activation via AICAR leads to increased expression of mitochondrial enzymes, improved oxidative capacity, and enhanced glucose transporter type 4 (GLUT4) translocation independent of insulin signaling pathways. Research groups examining parallel metabolic mechanisms may also consult our comprehensive guide on MOTS-c research pathways to compare mitochondrial-derived peptide actions against direct nucleoside mimetics.

Comparative Analysis: AICAR vs. GW501516 and MOTS-c

When designing preclinical protocols investigating metabolic modulation, researchers frequently compare AICAR to other small molecules and mitochondrial peptides. While AICAR functions as a direct AMP mimetic activating AMPK, compounds like GW501516 cardarine research reagents operate through an entirely distinct mechanism—acting as a high-affinity agonist of the Peroxisome Proliferator-Activated Receptor delta (PPARδ). Conversely, MOTS-c mitochondrial peptides represent endogenously encoded mitochondrial-derived peptides that translocate to the nucleus during metabolic stress to regulate nuclear gene expression.

While GW501516 primarily alters transcriptional activity downstream of lipid sensing and MOTS-c regulates systemic folate and purine metabolism, original AICAR directly targets the master energy sensor AMPK at the enzyme level. Comparing these distinct pathways enables laboratories to map complex cross-talk between nuclear transcription factors, mitochondrial signals, and intracellular energy sensing cascades in robust experimental models.

Laboratory Handling, Solubility, and Reconstitution Protocols

Achieving consistent assay outcomes requires meticulous handling and reconstitution practices. Original AICAR is soluble in aqueous buffers including phosphate-buffered saline (PBS, pH 7.2) up to approximately 10 mg/mL, as well as in dimethyl sulfoxide (DMSO) and water. For maximum stability in cell culture media, fresh stock solutions should be prepared immediately prior to laboratory experiments.

Researchers should reconstitute dry AICAR powder using sterile, endotoxin-free water or appropriate buffer solutions under a certified laminar flow hood. Vortexing or gentle sonication may be applied to achieve complete dissolution. Stock solutions prepared in DMSO can be aliquoted into single-use microcentrifuge tubes and stored at -80°C to prevent degradation over multiple freeze-thaw cycles. Comprehensive reconstitution parameters for diverse assay media are curated within the PX1 Research library.

Assay Integration and In Vitro Experimental Design

In cell-based experimentation, working concentrations of original AICAR typically range from 0.1 mM to 2.0 mM, depending on the cell line, exposure duration, and targeted endpoint (e.g., Thr172 phosphorylation verification versus downstream gene transcription). In vitro studies indicate that exposure times of 1 to 4 hours are generally sufficient to observe acute AMPK activation, whereas multi-day incubations are utilized to measure mitochondrial enzyme induction and structural biogenesis.

To rule out off-target effects, control groups should incorporate specific AMPK inhibitors (such as Compound C / Dorsomorphin) or knockdown models (siRNA targeting AMPK α1/α2 subunits). Maintaining precise molarity and controlling for potential nucleoside transporter saturation are vital considerations when quantifying substrate oxidation rates or intracellular ATP/AMP ratios.

Analytical Verification: HPLC, Mass Spectrometry, and Endotoxin Standards

In scientific research, material purity directly dictates data integrity. Low-grade or unverified compounds introduce confounding variables, such as unreacted chemical intermediates or microbial endotoxins, which can induce nonspecific inflammatory responses in cell culture models. PX1 Research ensures that every batch of original AICAR undergoes rigorous analytical verification before distribution.

Purity is quantitatively confirmed via High-Performance Liquid Chromatography (HPLC), guaranteeing a minimum chemical purity threshold of ≥98%. Mass Spectrometry (MS) analysis is conducted concurrently to verify the exact molecular mass and eliminate the presence of positional isomers or residual contaminants. Furthermore, every lot is subjected to Chromogenic Reagent Endotoxin Assay testing to ensure endotoxin levels remain below strict laboratory limits (<0.05 EU/mg), ensuring compatibility with sensitive primary cell lines and in vitro assays.

Sourcing USA-Manufactured Compounds for Institutional Research

Procuring research compounds from verified domestic suppliers mitigates logistics delays and guarantees batch-to-batch consistency. PX1 Research operates out of state-of-the-art facilities in California and Arizona, utilizing ISO 17025 accredited testing laboratories and GMP-compliant manufacturing protocols to deliver uncompromised analytical standards.

Principal investigators, university departments, and private research institutions requiring bulk quantities or dedicated lot reservation can establish institutional procurement pipelines via our dedicated wholesale lab access platform. Each order ships complete with lot-specific Certificates of Analysis (COAs) detailing raw HPLC chromatograms, mass spectra, and endotoxin verification data.