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Aicar injection is a class of synthetic cell-permeable nucleoside analog preparations with 5-aminoimidazole-4-carboxamide riboside (AICAR) as its core active ingredient. AICAR (Arasine) also serves as a key intermediate metabolite in the de novo purine biosynthesis pathway of living organisms. Bypassing physiological energy-consuming processes, it pharmacologically activates AMPK directly to initiate catabolism, inhibit anabolism, and remodel cellular energy homeostasis.
Boasting prominent pharmacological merits including strong targeting performance, high stability and reversible effects, this preparation has become a core research tool in the fields of metabolic regulation, exercise physiology, inflammatory immunity and severe infection, providing critical support for dissecting the pathogenesis of related diseases and discovering new drug targets.
Aicar COA
Applications in Animal Models of Metabolic Diseases
Metabolic disorders have evolved into highly prevalent chronic diseases worldwide, pathologically characterized by abnormal glucose and lipid metabolism, insulin resistance, obesity and non-alcoholic fatty liver disease (NAFLD). Inactivation of the AMPK pathway represents a shared core mechanism underlying all types of metabolic diseases. By targeted activation of AMPK, aicar injection comprehensively modulates glucose and lipid metabolism and ameliorates insulin sensitivity, making it the most commonly used positive intervention agent for verifying metabolic mechanisms and evaluating pharmacodynamic efficacy in metabolic disease animal models such as mice and rats.
In diabetic model studies, intraperitoneal administration of the product to high-fat diet-induced type 2 diabetic mice and spontaneous diabetic rats significantly elevates AMPK phosphorylation levels in skeletal muscle, liver and adipose tissue, upregulates membrane translocation of GLUT4 protein, facilitates insulin-independent glucose uptake in skeletal muscle, and suppresses the expression of key hepatic gluconeogenic enzymes to reduce endogenous glucose production. It effectively lowers fasting blood glucose and alleviates impaired glucose tolerance and insulin resistance.
Multiple model experiments confirm that sustained low-dose injection intervention markedly reduces glycated hemoglobin levels in model animals and delays functional deterioration of pancreatic β-cells, furnishing direct pharmacological evidence for research on metabolic regulatory mechanisms of type 2 diabetes.
In obesity and dyslipidemia models, arasine activates the AMPK-PGC-1α signaling axis to boost mitochondrial biogenesis and fatty acid oxidative breakdown, suppress the activity of mTORC1-a core lipid synthesis pathway, and mitigate lipid accumulation in the liver and white adipose tissue.
For high-fat diet-induced obese mice, continuous intervention substantially decreases body weight, body fat percentage, as well as serum triglyceride and cholesterol levels, alleviates adipocyte hypertrophy and ectopic lipid deposition, and rectifies systemic dyslipidemia. Meanwhile, in animal models of NAFLD and metabolic syndrome, this preparation alleviates hepatic steatosis, reduces inflammatory infiltration in liver tissue, and blocks the vicious metabolic cycle triggered by lipotoxicity.
Furthermore, in metabolic aging models, arasine ameliorates mitochondrial function and repairs energy metabolic disorders to delay aging-related metabolic degeneration. It acts as a stable and reliable intervention tool for mechanistic exploration, target validation and candidate drug screening of metabolic disorders, and is an indispensable reagent for basic research on metabolic diseases.
Applications in Exercise Physiology and Doping Research
Possessing an exercise-mimicking property, arasine functions as a core research reagent in exercise physiology, and meanwhile a focal research subject for sports doping control and detection. Under physiological conditions, prolonged exercise depletes ATP and elevates the AMP/ATP ratio to activate AMPK, thereby triggering exercise adaptive alterations including mitochondrial proliferation, enhanced oxidative metabolism and improved endurance. Without physical exercise load, arasine directly activates AMPK via pharmacological means and recapitulates metabolic adaptive effects induced by exercise, rendering it a pivotal tool for deciphering physiological regulatory mechanisms of physical activity.
In animal model studies of exercise physiology, short-term or long-term intervention with arasine in experimental mice significantly upregulates the expression of genes related to skeletal muscle oxidative metabolism, promotes slow-twitch muscle fiber differentiation, inhibits fast-twitch fiber hypertrophy, and enhances aerobic oxidation capacity and exercise endurance of skeletal muscle. Studies demonstrate that mice receiving arasine without exercise intervention exhibit drastically prolonged maximal exercise duration and elevated endurance capacity, alongside a remarkable increase in skeletal muscle mitochondrial quantity and oxidase activity, perfectly replicating the physiological outcomes of long-term aerobic training. It establishes an important research model to distinguish molecular mechanisms of physiological exercise regulation and pharmacological drug modulation.
In research on exercise fatigue and adaptive mechanisms, aicar injection effectively relieves energy exhaustion and oxidative stress induced by exhaustive exercise. It enhances fatty acid oxidation and ATP synthesis efficiency to reduce lactic acid accumulation during exercise, postpone fatigue onset, and accelerate skeletal muscle injury repair and energy metabolism recovery post-exercise. Owing to its unique exercise-mimicking efficacy, AICAR is listed as a prohibited performance-enhancing substance by the World Anti-Doping Agency (WADA), which has driven extensive research related to doping.
In doping detection and control studies, researchers utilize animal injection models to systematically investigate the in vivo pharmacokinetic profiles, tissue distribution and excretion patterns of AICAR, identify its metabolic biomarkers in blood and urine, and establish precise doping detection methods. Relevant research further validates the efficacy mechanism and dose-effect relationship of arasine in boosting athletic performance, clarifies the physiological basis for its illicit use, and provides scientific support for competitive sports doping control and standardized medication guidelines for athletes. In addition, this preparation is applied to the research and development of novel target drugs for endurance improvement and exercise fatigue recovery, opening new avenues for precise intervention in sports medicine.
Applications in Inflammation, Immunity and Sepsis Models
The AMPK pathway serves as a vital negative regulatory axis for systemic inflammatory responses and immune homeostasis. By activating AMPK, arasine comprehensively suppresses excessive inflammatory reactions and modulates immune cell activation, exhibiting great application value in animal models of inflammatory injury, immune disorders and severe sepsis. It delivers core experimental support for mechanistic research and intervention strategy development of inflammatory diseases and severe infections.
In general inflammatory models including lipopolysaccharide (LPS)-induced systemic inflammatory mice and local tissue inflammatory injury models, intervention with arasine markedly inhibits activation of the NF-κB inflammatory signaling pathway, downregulates the release of pro-inflammatory factors such as TNF-α, IL-6 and IL-1β, upregulates anti-inflammatory factor expression, and alleviates tissue inflammatory infiltration and oxidative stress damage. In local inflammation models involving airway, intestinal and vascular inflammation, the preparation efficiently relieves mucosal congestion, inflammatory cell infiltration and tissue damage, and blocks the pathological progression of sustained chronic inflammation, providing a dependable intervention model for mechanistic research on chronic inflammatory disorders.
In immune regulation research, arasine precisely modulates the functional phenotypes of core immune cells including macrophages, T lymphocytes and neutrophils. It inhibits macrophage polarization toward pro-inflammatory M1 subtype while facilitating transformation into anti-inflammatory M2 subtype to attenuate excessive macrophage immune responses. It also balances T cell subsets, suppresses aberrant activation of helper T cells, enhances the function of regulatory T cells, rectifies systemic immune dysregulation, and prevents tissue damage elicited by overactive immune reactions.
In autoimmune inflammatory models, it effectively mitigates autoimmune-mediated tissue injury and maintains immune homeostasis.
Intervention efficacy of aicar injection is more pronounced in severe sepsis animal models. Sepsis is pathologically characterized by uncontrolled systemic inflammatory response, immune paralysis and multiple organ dysfunction, accompanied by an extremely high mortality rate. Studies verify that pretreatment or early intervention with arasine in septic mice profoundly suppresses systemic inflammatory storm, drastically reduces serum pro-inflammatory factor levels, and alleviates inflammatory injury, oxidative stress and cell apoptosis in vital organs including heart, lung, liver and kidney.
Moreover, the preparation ameliorates sepsis-induced immunosuppression, restores systemic immune clearance capacity, lowers mortality of model animals, and delays the initiation and progression of multiple organ dysfunction syndrome (MODS). At present, arasine has become a core tool for dissecting inflammatory and immune mechanisms of sepsis and screening intervention targets for severe inflammation, offering important experimental evidence for the development of adjuvant therapies for clinical severe infections.
Applications in In Vivo Models of Fibrotic Diseases
Owing to its targeted AMPK-activating activity, arasine effectively intervenes in the pathological progression of multi-organ fibrosis. It is currently widely utilized in in vivo animal model studies of hepatic, pulmonary, myocardial and other fibrotic diseases, serving as a vital reagent for validating anti-fibrotic mechanisms and screening candidate drugs.
The core pathology of organ fibrosis consists of aberrant fibroblast activation, myofibroblast proliferation and excessive extracellular matrix deposition, accompanied by persistent low-grade inflammation and metabolic disorders. Suppression of the AMPK pathway acts as a critical trigger for fibrosis progression.
In carbon tetrachloride-induced mouse hepatic fibrosis models, bleomycin-induced pulmonary fibrosis models and post-myocardial ischemia fibrosis models, in vivo intervention with arasine markedly activates tissue AMPK signaling, inhibits the activation of the canonical pro-fibrotic TGF-β/Smad pathway, downregulates the abnormal expression of matrix proteins such as collagen I and collagen III, and reduces collagen deposition in tissues.
Meanwhile, it represses the transformation of fibroblasts into myofibroblasts and alleviates organ tissue remodeling and functional sclerosis. Furthermore, by suppressing local chronic inflammatory infiltration and ameliorating disordered tissue energy metabolism, it breaks the vicious inflammatory-fibrotic cycle and mitigates pathological organ injury. This preparation provides a stable and reliable in vivo intervention model for deciphering the molecular pathogenesis of fibrosis and verifying the targeted anti-fibrotic effects of AMPK activation.
The core raw material of the product is 5-aminoimidazole-4-carboxamide riboside (AICAR). Its synthetic routes are mainly divided into chemical synthesis and microbial fermentation. Chemical synthesis dominates industrial production and preparation manufacturing, supplemented by biological purification processes, enabling efficient production of high-purity AICAR raw materials suitable for injectable formulation processing.
Chemical Synthesis Route
Chemical synthesis adopts inosine as the starting material to complete skeleton construction and modification through multiple controllable chemical reactions, featuring mild overall reaction conditions and high product purity.
Firstly, acetone is used to protect ribose hydroxyl groups of inosine to avoid hydroxyl damage in subsequent reactions. Alkaline hydrolysis then reconstructs the purine ring framework, converting the parent purine nucleus into the characteristic imidazole-4-carboxamide scaffold to yield crude AICAR intermediates.
Subsequent structural optimization is implemented via coupling with dibenzyl aspartate and phosphorylation with tetrabenzyl pyrophosphate. Finally, catalytic hydrogenolysis removes protecting groups to obtain high-purity AICAR monomer.
Microbial Fermentation Route
The microbial fermentation route relies on microbial purine metabolism pathways. Engineered strains of modified yeast and Escherichia coli are cultivated in optimized culture media containing low concentrations of alkanoic acids.
The de novo purine biosynthesis pathway of microorganisms is regulated to promote the conversion of SAICAR to AICAR via fumarate elimination. Product yield is elevated by controlling parameters such as fermentation temperature and residual sugar concentration. The fermentation broth undergoes impurity removal by centrifugation, filtration purification, crystallization and drying to obtain refined AICAR powder.
FAQ
What are the long-term effects of arasine?
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Long-term arasine administration induced a considerable decrease in fasting plasma levels of insulin and glucose in this animal model for insulin resistance. These changes were accompanied by a normalization of glucose tolerance when compared with non-insulin-resistant lean animals.
How does arasine compare to exercise?
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Arasine administration at rest naturally differs to exercise because there is no muscle contraction and there are not the large increases in blood flow or oxygen consumption that occur during exercise/contraction. However, both result in alterations in muscle that signal that there is an energy deficit.
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