Introduction/Overview
Atherosclerosis and related cardiovascular and cerebrovascular diseases are one of the major causes of death and disability worldwide. Although modern medicine has made significant progress in lipid-lowering, antiplatelet, and interventional therapy, the complexity of diseases and the side effects caused by long-term medication have prompted researchers to continuously explore candidate molecules with multi-target regulatory potential and good safety from natural products. As a class of secondary metabolites widely present in medicinal plants, iridoid glycosides have attracted much attention due to their diverse biological activities. Among them, 7-O-Methylmorinoside (CAS: 41679-97-4) is a traditional Chinese medicine derived from Cornus officinalis（Cornus officinalis Sieb. et Zucc. and honeysuckle（Lonicera japonica In recent years, iridoid glycosides isolated from plants such as Thunb.) have shown remarkable potential in the field of anti atherosclerosis research. This article aims to systematically review the chemical properties, plant sources, pharmacological activities, molecular mechanisms of action, pharmacological evaluation, and clinical application prospects of 7-O-methylmononucleoside, in order to provide comprehensive scientific references for the in-depth research and development of this compound.
Chemical structure and physicochemical properties
7-O-methylmononucleoside is a cyclic terpenoid glycoside compound. Its basic skeleton is the iridoid parent nucleus, which is connected to a molecule of glucose through glycosidic bonds and undergoes methylation on the hydroxyl group at position 7 of the parent nucleus. This is the key structural feature that distinguishes it from its precursor, morroniside. This methylation modification may significantly affect its lipid water partition coefficient, metabolic stability, and interaction mode with target proteins.
Its molecular formula is C17H26O11 and its molecular weight is 420.4110. The calculated lipid water partition coefficient (LogP) is approximately -1.0354, indicating that the compound has a high degree of hydrophilicity. The topologically polar surface area (TPSA) is as high as 153.3700 Å ², mainly attributed to the numerous oxygen atoms in the molecule (from sugar groups and multiple hydroxyl groups). The theoretically calculated water solubility value is 38.9214 mg/L, further confirming its good water solubility. These physicochemical parameters suggest that the distribution of 7-O-methylmononucleoside in the body may be more inclined towards hydrophilic environments, and oral bioavailability may face challenges that need to be improved through pharmaceutical methods. Preliminary pharmacological screening showed that its ability to cross the blood-brain barrier is low, and it has no significant inhibitory effect on hERG potassium channels (indicating a low potential risk of cardiac toxicity). The Ames test result was 0.3, indicating a low risk of mutagenicity and providing a safety basis for further development.
Plant sources and extraction methods
7-O-methylmononucleoside is mainly derived from the Cornaceae plant Cornus officinalis（Cornus officinalis）Dry and ripe fruit flesh. Cornus officinalis is a famous traditional Chinese medicine that nourishes the liver and kidneys. It is recorded in ancient books such as "Treatise on Cold Damage" and is commonly used to treat symptoms such as soreness and weakness of the waist and knees, dizziness and tinnitus. In addition, the honeysuckle plant in the honeysuckle family（Lonicera japonica）The presence of this ingredient has also been detected in China, which broadens its natural sources.
The extraction of 7-O-methylmononucleoside from plant materials is usually carried out using solvent extraction method. The common process is as follows: Grind the dried Cornus officinalis pulp and use methanol, ethanol, or ethanol water solutions of different proportions for heating reflux or ultrasound assisted extraction. The extract is concentrated under reduced pressure to obtain a paste. Further separation and purification often use modern chromatographic techniques, such as macroporous adsorption resin column chromatography (commonly used models such as D101, AB-8, etc.) for initial enrichment, followed by fine separation using silica gel column chromatography, reverse phase silica gel column chromatography (such as ODS-C18), and high-performance liquid chromatography (HPLC) or preparative liquid chromatography, ultimately obtaining high-purity 7-O-methylmononucleoside monomer. The combination of optimization of extraction process (such as solvent selection, temperature, time) and purification strategy is the key to ensuring its yield and purity.
Pharmacological activity research
A large number of pharmacological studies in vitro and in vivo have shown that 7-O-methylmonoglycoside has various biological activities. Its core research direction focuses on anti atherosclerosis, and extends to related anti-inflammatory, antioxidant, anti apoptosis and vascular protection effects.
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Anti atherosclerotic effect: In atherosclerosis models such as apolipoprotein E knockout (ApoE -/-) mice, 7-O-methylmonoside administration can significantly reduce the area of aortic plaque, reduce lipid deposition and macrophage infiltration in plaque, and stabilize plaque structure. Its function involves multiple aspects such as regulating lipid metabolism, inhibiting vascular inflammation, and improving endothelial function.
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Anti inflammatory and antioxidant effects This compound can effectively inhibit the overexpression of inflammatory factors (such as TNF - α, IL-1 β, IL-6) induced by lipopolysaccharide (LPS) or oxidized low-density lipoprotein (ox LDL) in macrophages and vascular endothelial cells. At the same time, it can enhance the intracellular antioxidant defense system, such as upregulating the activity of superoxide dismutase (SOD) and glutathione peroxidase (GSH Px), reducing the levels of reactive oxygen species (ROS) and malondialdehyde (MDA), thereby alleviating oxidative stress damage.
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Anti apoptosis and protection of vascular endothelial cells Under the stimulation of injury factors such as ox LDL, 7-O-methylmononucleoside can inhibit excessive apoptosis of vascular endothelial cells and vascular smooth muscle cells, maintaining the integrity of vascular wall cells. This is crucial for preventing plaque instability and thrombus formation.
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Potential neuroprotective and anti complications of diabetes Based on the traditional use of cornus officinalis, some studies also suggest that 7-O-methylmonoglycoside may have an improvement effect on diabetes nephropathy, cognitive dysfunction, etc. These activities are closely related to its anti-inflammatory, antioxidant and microcirculation improving properties.
Mechanism of action and molecular targets
The anti atherosclerotic effect of 7-O-methylmonoglycoside is not achieved through a single pathway, but involves a complex multi target regulatory network. Existing research has revealed its interactions with multiple key target proteins:
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LOX-1 (lectin like oxidized low-density lipoprotein receptor-1)LOX-1 is the main receptor for recognizing and uptake of ox LDL on endothelial cells, and is a key molecule for the initiation of atherosclerosis. 7-O-methylmonoside has been proved to down regulate the expression of LOX-1, thereby reducing the endocytosis of ox LDL and the resulting endothelial dysfunction, inflammatory response and foam cell formation.
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AMPK (AMP activated protein kinase)AMPK is the core regulator of cellular energy metabolism. 7-O-methylmononucleoside can activate the AMPK (PRKAA1 subunit) pathway. On the one hand, the activation of AMPK can inhibit the activity of key enzymes for cholesterol synthesis (such as HMG CoA reductase), on the other hand, it can up regulate the expression of ABCA1, the key protein for cholesterol reverse transport, promote the outflow of cholesterol in macrophages, and play an anti atherosclerotic role.
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ABCA1 (ATP binding cassette transporter A1)As mentioned above, as the main transport protein of cholesterol efflux, the expression of ABCA1 is up-regulated by 7-O-methylmonoside through AMPK and other pathways, which is one of its direct mechanisms to promote the degreasing of foam cells and inhibit the development of plaque.
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EHMT2 (Histone Lysine Methyltransferase G9a)Epigenetic regulation plays an important role in atherosclerosis. EHMT2 catalyzes the dimethylation of histone H3 lysine 9 (H3K9me2), which is typically associated with gene transcription inhibition. It has been found that 7-O-methylmonoglycoside may play a therapeutic role by inhibiting the activity of EHMT2 and changing the epigenetic status of specific atherosclerosis promoting genes.
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Bcl-2 family proteins (MCL1, BCL2)This compound can upregulate the expression of anti apoptotic proteins MCL1 and BCL2, and may also affect the activity of pro apoptotic proteins, thereby reshaping the balance of apoptosis in cells and protecting vascular cells from ox LDL induced apoptosis.
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RECQ1 (RecQ helicase 1)RECQ1 is a DNA helicase involved in DNA replication, repair, and maintaining genomic stability. Some studies suggest that 7-O-methylmonoglycoside may be involved in maintaining the genomic stability of vascular cells under stress by affecting the function of RECQ1, but its specific role in atherosclerosis needs further exploration.
To sum up, 7-O-methylmonoglycoside cooperatively exerts its anti atherosclerotic effect from multiple dimensions such as reducing lipid intake, promoting lipid outflow, inhibiting inflammatory oxidative stress, and protecting cell survival by simultaneously acting on multiple targets such as LOX-1, AMPK, EHMT2, ABCA1, and Bcl-2 families.
Evaluation of drug properties and pharmacokinetics
Although the pharmacological activity of 7-O-methylmononucleoside is clear, its pharmacological properties still need to be comprehensively evaluated. As mentioned earlier, its high hydrophilicity (low LogP, high TPSA) suggests that oral absorption may be poor and its bioavailability limited. The existing pharmacokinetic studies are relatively limited, but based on its glycoside structure, it can be speculated that it may be partially hydrolyzed by microbial communities in the gastrointestinal tract, and after absorption, it may undergo further II binding reactions such as glucuronidation or sulfation in the liver.
Preliminary studies on animal pharmacokinetics (usually conducted in rodents) require attention to the following parameters: peak time after oral administration (Tmax), peak concentration (Cmax), half-life (t1/2), and absolute bioavailability. Due to its good water solubility, developing injectable formulations (such as intravenous injection) may be a way to bypass absorption barriers and achieve rapid efficacy. For oral formulations, it is necessary to consider using formulation technologies such as phospholipid complexes, nanoemulsions, solid dispersions, or prodrug strategies to improve their membrane permeability and bioavailability. Its lower hERG inhibition risk and negative Ames test results are favorable starting points for its safety development, but comprehensive preclinical safety evaluation (such as long-term toxicity, reproductive toxicity, etc.) is still a necessary step in the future.
Clinical application prospects and prospects
The clinical application prospects of 7-O-methylmononucleoside, as an active monomer derived from traditional Chinese medicine, are mainly reflected in the following aspects:
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As a candidate molecule for an innovative anti atherosclerosis drug: Its clear multi target mechanism of action is in line with the current trend of drug development for complex diseases (such as atherosclerosis). In the future, it can be developed into a new class of chemicals or traditional Chinese medicine for the prevention and treatment of atherosclerotic cardiovascular and cerebrovascular diseases (such as coronary heart disease, ischemic stroke).
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Interpretation of the biomarker and functional substance basis for quality control of traditional Chinese medicine compound prescriptions In Cornus officinalis and related compounds (such as Liuwei Dihuang Pills), 7-O-methylmononucleoside can be used as one of the key quality indicators to control the quality of medicinal materials and finished products. At the same time, in-depth research on its activity can help explain some scientific connotations of the traditional efficacy of Cornus officinalis in nourishing liver and kidney, nourishing essence and blood from a modern scientific perspective.
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The potential of combination therapy Given its unique mechanism of action (such as regulating the epigenetic enzyme EHMT2), 7-O-methylmononucleoside may be used in combination with existing statins, antiplatelet drugs, etc. to produce synergistic effects, or for the treatment of patients who are insensitive to existing therapies.
However, its development also faces challenges: firstly, there is an urgent need for systematic and complete preclinical pharmacokinetic and toxicological research data. Secondly, it is necessary to optimize the synthesis or biosynthesis process to solve the problem of limited natural sources and provide sufficient material support for subsequent development. Finally, further fundamental research is needed to elucidate its specific target network, particularly the interaction details with targets such as RECQ1, as well as its specificity in different cells and tissues.
Conclusion
7-O-methylmonoglycoside is a kind of iridoid glycoside with significant anti atherosclerosis potential, which was excavated from cornus officinalis and other traditional Chinese medicines. It exerts multidimensional regulatory effects on multiple pathological processes such as lipid metabolism, inflammatory response, oxidative stress, and cell apoptosis by acting on multiple key targets such as LOX-1, AMPK, ABCA1, EHMT2, Bcl-2, reflecting the advantages of natural product multi-target intervention in complex diseases. Although there are challenges in drug formulation, especially in oral absorption, its clear pharmacological activity and good preliminary safety characteristics make it a candidate drug molecule worth further research and development. Future research should focus on the systematic optimization of its pharmacokinetic properties, precise analysis of its mechanism of action, and product development based on modern formulation technology, with the ultimate goal of transforming this ancient plant gift into modern drugs that benefit a wide range of cardiovascular and cerebrovascular disease patients.
