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1,7-Dimethylxanthine More Info

1,7-Dimethylxanthine is a dimethylated derivative of xanthine, a purine base, with the CAS Registry Number 611-59-6. Its molecular structure consists of a xanthine core—a fused pyrimidine and imidazole ring system—where methyl groups are specifically located at the nitrogen positions 1 and 7. This specific methylation pattern distinguishes it from its isomers, such as theophylline and paraxanthine, conferring unique physicochemical and pharmacological properties. It is a naturally occurring metabolite found in the body and also appears as an intermediate in the metabolism of certain methylxanthines.

The compound exhibits a pharmacological profile as a mild non-selective phosphodiesterase inhibitor and a competitive non-selective adenosine receptor antagonist. By inhibiting PDE enzymes, it leads to an accumulation of intracellular cyclic adenosine monophosphate, while its blockade of adenosine receptors prevents the normal inhibitory actions of adenosine in various tissues. These dual mechanisms result in mild stimulatory effects on the central nervous system, relaxation of smooth muscle, and a potential diuretic action. However, its potency in these areas is generally lower than that of its more well-known relatives like caffeine or theophylline.

The primary significance of 1,7-dimethylxanthine lies in its role as a key metabolic intermediate. It is a major metabolite of the bronchodilator theophylline, formed in the liver via the cytochrome P450 1A2 pathway. Its presence in biological fluids is therefore used as a biomarker in pharmacokinetic studies to monitor the metabolic fate of theophylline in both clinical and research settings. While not a primary therapeutic agent itself, understanding its formation and clearance is important for managing theophylline therapy and assessing metabolic function.

From a biochemical perspective, this compound is typically encountered as a white crystalline powder in laboratory settings. Its solubility and stability follow the general patterns of methylxanthines. In research, it may be used as a reference standard in chromatography for the identification and quantification of xanthine metabolites in physiological samples. It also serves as a chemical tool to study the structure-activity relationships within the methylxanthine class, helping to elucidate which molecular features contribute to specific biological effects.

The safety and toxicological profile of 1,7-dimethylxanthine is generally considered to be mild, especially in the low concentrations encountered as a metabolite. As with related xanthines, very high concentrations could theoretically lead to side effects such as nervousness, tachycardia, or gastrointestinal upset, but these are not commonly associated with it as a stand-alone substance. Its main relevance to human health is indirect, through its role in the metabolism of other drugs. It is not commonly used as a direct pharmaceutical agent but remains an important compound in metabolic and pharmacological research.

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