Introduction/Overview
Loganic acid (CAS number: 22255-40-9) is a typical natural product of iridoids, mainly isolated from the fruit of Cornus officinalis. As an important plant secondary metabolite, loganin acid has received widespread attention in the field of natural product pharmacology in recent years due to its unique chemical structure and diverse biological activities. Numerous studies have shown that loganin acid has significant anti-inflammatory, antioxidant, and cell protective effects, especially in regulating inflammatory responses and redox homeostasis, demonstrating good potential. In addition, loganin can regulate diet induced atherosclerosis, which shows its application prospect in the prevention and treatment of cardiovascular diseases. This article will systematically review the chemical structure and physicochemical properties, plant sources and extraction methods, pharmacological activity and mechanism of action, pharmacological evaluation and pharmacokinetic characteristics of loganin acid, and explore its clinical application prospects and future development directions.
Chemical structure and physicochemical properties
Maqian glycoside acid is a cyclic iridoid compound with a molecular formula of C16H24O10 and a molecular weight of 376.3580. Its structural features include a cyclic ether skeleton, connected with multiple hydroxyl and carboxyl functional groups, giving it high polarity and water solubility. The topological polar surface area (TPSA) of loganin acid is 166.14 Å ², indicating its strong polarity and hydrogen bond donor/acceptor ability, which facilitates stable binding with biomolecules. Its LogP value is -1.2267, indicating low lipid solubility, consistent with its good water solubility (around 48.54 mg/mL), which has a significant impact on oral absorption and in vivo distribution.
In terms of physicochemical properties, loganin acid is not easily able to pass through the blood-brain barrier (BBB), which may limit its direct application in central nervous system diseases, but reduces the risk of central neurotoxicity. The hERG channel inhibition experiment showed a negative result, indicating a low risk of cardiac toxicity. The Ames mutagenicity test showed 0, indicating good genetic toxicity safety. Overall, the physicochemical properties of loganin acid have laid a solid foundation for its further pharmacological research and drug development.
Plant sources and extraction methods
Maginogenic acid is mainly distributed in the fruit of Cornus officinalis, a plant in the family Cornaceae. It is widely used in traditional Chinese medicine and has the effects of tonifying the kidneys, consolidating essence, astringent essence, and stopping diarrhea. In addition to Cornus officinalis, some other plants such as Strychnos nux nomica also have a small amount of loganin acid present, but the main source is Cornus officinalis fruit.
The extraction method usually uses water or alcohol solvents for extraction, combined with column chromatography, reverse phase high performance liquid chromatography (RP-HPLC) and other techniques for purification. In recent years, modern extraction techniques such as ultrasound assisted extraction and microwave-assisted extraction have been applied to improve the extraction efficiency and purity of loganin acid. The specific process generally includes: crushing the dried Cornus officinalis fruit, extracting it with 70% ethanol or pure water, filtering and concentrating the extract, separating and purifying it using a silica gel column or C18 reverse phase column, and finally obtaining high-purity crystals or powders of loganin acid.
Pharmacological activity research
anti-inflammatory activity
Maqian glycoside acid exhibits significant anti-inflammatory effects and can effectively inhibit the expression and release of various inflammatory mediators. Both in vitro cell models and in vivo inflammation models have confirmed that it reduces the expression of pro-inflammatory factors such as TNF - α, IL-6, IL-1 β, etc. by inhibiting the NF - κ B signaling pathway, thereby alleviating the inflammatory response. The relevant targets include NFKB1, TNF, IL-6, STAT3, CASP1, etc., showing their multi-target regulatory characteristics. In addition, loganin acid can regulate inflammation related ion channels such as TRPV1 and TRPA1, further regulating the neuroimmune interaction during the inflammatory process.
Antioxidant and Cellular Protective Effects
Maqian glycoside acid has strong free radical scavenging ability, which can effectively eliminate reactive oxygen species (ROS) such as superoxide anions and hydroxyl radicals, and alleviate oxidative stress damage. It activates the Nrf2 signaling pathway, promotes the expression of downstream antioxidant enzymes such as HO-1 and NQO1, and enhances the antioxidant defense ability of cells. In addition, loganin acid has a significant protective effect on heavy metal mediated cytotoxicity, which can alleviate heavy metal induced oxidative damage and cell apoptosis.
Cardiovascular protective effect
In diet induced atherosclerosis model, loganin can regulate lipid metabolism, reduce vascular endothelial damage, inhibit inflammatory reaction and oxidative stress, and delay the progress of atherosclerosis. Its mechanism of action involves multiple pathways such as anti-inflammatory, antioxidant, and regulation of lipid metabolism, demonstrating potential value in the prevention and treatment of cardiovascular diseases.
Other pharmacological effects
Preliminary studies have also found that loganin acid has certain potential in regulating immune function, antibacterial and neuroprotective effects, but the relevant mechanisms still need to be further explored.
Mechanism of action and molecular targets
The pharmacological effects of loganin acid are mainly achieved by regulating inflammation and oxidative stress-related signaling pathways. Its core mechanism of action includes:
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Inhibition of NF - κ B signaling pathway NF - κ B is a key transcription factor in inflammatory response, and loganin acid inhibits the phosphorylation and degradation of I κ B α, preventing NF - κ B nuclear translocation and reducing the expression of pro-inflammatory factors such as TNF - α, IL-6, PTGS2 (COX-2), etc., achieving anti-inflammatory effects.
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Activate the Nrf2 signaling pathway Nrf2, as the main regulator of cellular antioxidant defense, promotes the transfer of Nrf2 from cytoplasm to nucleus, induces the expression of antioxidant enzyme genes, and enhances cellular resistance to oxidative stress.
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Regulating inflammation related targets Including STAT3, CASP1 (inflammasome component), TRPV1/TRPA1 (inflammation related ion channels), NOS2 (inducible nitric oxide synthase), PTGS1 (COX-1), etc., loganin acid achieves comprehensive regulation of inflammatory response through multi-target synergistic action.
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Free radical scavenging and cell protection Matric acid directly scavenges ROS, protects mitochondrial function, and prevents cell apoptosis and necrosis, especially showing significant protective effects in cell damage induced by heavy metal toxicity.
In summary, loganin acid exhibits excellent pharmacological activity and potential therapeutic value due to its multi-target and multi pathway mechanism of action.
Evaluation of drug properties and pharmacokinetics
The pharmacological evaluation of loganin acid shows that it has good safety and pharmacokinetic characteristics:
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Oral activity Maqian glycoside acid has good water solubility and moderate molecular weight, supporting its feasibility for oral administration. Although the LogP value is low, indicating limited lipid solubility, its polar structure facilitates absorption mediated by intestinal transporters.
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Low blood-brain barrier penetration This limits its application in central nervous system diseases, but at the same time reduces the risk of central neurotoxicity.
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No risk of cardiac toxicity The hERG channel inhibition experiment was negative, reducing the potential risk of arrhythmia.
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No genetic toxicity The Ames test results showed no mutagenicity and met the requirements for safe medication.
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Pharmacokinetic characteristics Currently, there is limited research on the in vivo metabolism and excretion of loganin acid. Preliminary data suggests that it has good bioavailability and a long half-life in animals, but further systematic studies are still needed.
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Potential for drug interactions Due to its multi hydroxyl structure, it may interact with certain drug metabolizing enzymes or transporters, which requires special attention in subsequent research.
Clinical application prospects and prospects
Based on the multiple pharmacological activities of loganin, especially its anti-inflammatory, antioxidant, and cardiovascular protective effects, it has broad clinical application prospects in various disease fields in the future:
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Chronic inflammatory diseases For rheumatoid arthritis, inflammatory bowel disease, etc., loganin acid is expected to become a safe and effective candidate for anti-inflammatory drugs by regulating the NF - κ B and Nrf2 pathways.
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cardiovascular disease: For atherosclerosis, hyperlipidemia, etc., loganin can be used as an auxiliary treatment drug to delay the progress of the disease.
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Oxidative stress-related diseases It includes diabetes and its complications, neurodegenerative diseases, etc. The antioxidant effect of loganin provides a potential therapeutic basis for it.
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Heavy metal poisoning and its application in environmental toxicology Its cell protective effect makes it a potential drug for preventing and treating heavy metal toxicity.
Future research should focus on the preclinical pharmacokinetics, toxicological evaluation, and clinical trial design of loganin acid to further clarify its safety and efficacy. In addition, the structural modification of loganin and the development of drug delivery systems will also promote its clinical translation.
Conclusion
As a natural product of cyclohexene ether terpenes with multiple targets and mechanisms, loganin acid exhibits rich pharmacological activity and good potential for drug development. Its mechanisms of action in anti-inflammatory, antioxidant, and cardiovascular protection have gradually been elucidated, and it has good safety and oral activity. Although there are still challenges in pharmacokinetics and clinical applications, with the advancement of modern drug development technology, loganin acid is expected to become an important candidate molecule for natural product drug development. The pharmacological mechanism research, structural optimization, and clinical validation of future systems will provide a solid foundation for their clinical applications and promote their widespread use in the field of natural medicine.