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6'-O-galloylalbiflorin is a natural monoterpene glycoside compound derived from the roots of the traditional Chinese medicinal herb Paeonia lactiflora Pall. As a gallyl derivative of albiflorin, this compound uniquely combines a monoterpene skeleton with a gallate group, endowing it with diverse bioactivity. In recent years, 6'-O-gallic acid white peony glycoside has gradually become a hot topic in natural product pharmacological research due to its multiple pharmacological effects, including androgen antagonism, antitumor effects, and regulation of plant metabolism. This paper will systematically review the chemical structure and physicochemical properties of this compound, plant origin and extraction methods, pharmacological activity and mechanism of action, druggability evaluation, and pharmacokinetic characteristics, and explore its clinical application prospects and future research directions.
The chemical structure of 6'-O-gallyl leukonin is based on the monoterpene glycoside backbone of peony glycosides, with the 6th hydroxyl group esterified by gallic acid to form a gallic acid group that substitutes it. The compound has a molecular formula of C29H36O16 and a molecular weight of 632.5710 Da. Its structural features include β-D-glucosidic bonds, secondary alcohol structure, bridging monoterpene backbone, gallate esters, and γ-lactone rings, reflecting the complex multifunctional group characteristics of natural products. Structurally, 6'-O-gallyl peony glycoside is related to paeoniflorin function, both of which are important monoterpene glycoside components in peony.
In terms of physicochemical properties, 6'-O-gallic white peony showed moderate hydrophobicity, with a LogP value of about 1.198, indicating certain lipid solubility and facilitating cell membrane penetration. Its polar surface area (TPSA) is 238.97 Ų, indicating good solubility in the aqueous phase, with a water solubility of about 0.3318 mg/mL. The blood-brain barrier has low permeability, suggesting its limited distribution in the central nervous system. Safety evaluation showed no inhibitory effect on hERG channels, and the Ames mutagenicity test was negative, indicating preliminary safety.
6'-O-Galloyl White Peony Glycoside is mainly isolated from peony roots. Peony belongs to the Ranunculaceae family and genus Shaoyao, and is widely used in traditional Chinese medicine to harmonize the liver and spleen, relieve pain, and have anti-inflammatory effects. Its roots contain abundant monoterpene glycoside components, with white peony glycoside and its derivatives being the main active components.
The extraction process typically uses dried peony root powder and reflux extraction using an ethanol-water mixed solvent (such as 70% ethanol). After concentration, the extract was purified by liquid-liquid separation, column chromatography (such as silica gel columns, C18 reversed-phase columns), and high-performance liquid chromatography (HPLC), ultimately yielding high-purity 6'-O-gallyl peonyloside. In recent years, new technologies such as ultrasound-assisted extraction and microwave-assisted extraction have also been applied to improve extraction efficiency and purity. Additionally, identification methods mainly rely on modern analytical techniques such as mass spectrometry (MS), nuclear magnetic resonance imaging (NMR), and infrared spectroscopy (IR) to ensure accurate confirmation of compound structures.
Pharmacological activity studies of 6'-O-gallic acid white peony have shown potential application value in multiple biological fields.
This compound exhibits significant androgen receptor (AR) antagonistic activity. Through in vitro cell models, 6'-O-gallic white peony glycoside can inhibit androgen-mediated signaling pathways, reduce the expression of AR target genes, and thereby suppress the proliferation of androgen-dependent cells. This characteristic gives it potential application prospects in treating diseases such as benign prostatic hyperplasia and androgen-dependent prostate cancer.
Multiple in vitro and in vivo experiments have shown that 6'-O-gallyl peony glycoside inhibits various tumor cell lines (such as breast cancer, liver cancer, and colon cancer cells). Its anti-tumor mechanism involves inducing apoptosis, blocking the cell cycle progression, and inhibiting tumor cell migration and invasion capabilities. Additionally, this compound can regulate the activity of immune cells in the tumor microenvironment, enhancing the body's anti-tumor immune response.
As a natural product containing gallate ester groups, 6'-O-gallyl white peony glycoside exhibits excellent antioxidant capacity, scavenging free radicals and reducing oxidative stress damage. At the same time, its inhibitory effect on inflammatory mediators (such as TNF-α, IL-6, etc.) suggests its potential protective effect in inflammation-related diseases.
The study found that 6'-O-gallic acid white peony glycoside is involved in regulating secondary metabolic processes in plants, affecting the plant's response mechanism to environmental stress. This characteristic not only enriches its biological functions but also provides a theoretical foundation for its application in agricultural biotechnology.
The multi-target mechanism of 6'-O-gallic acid peony mainly revolves around its regulation of androgen receptors, tumor-related signaling pathways, and inflammatory signaling pathways.
Through molecular docking and cell experiments, 6'-O-gallyl leukhoside can competitively bind to the AR ligand binding domain, blocking the binding of androgens (such as testosterone and dihydrotestosterone) to receptors, inhibiting AR nuclear translocation and transcriptional activation functions, thereby downregulating the expression of AR target genes. This mechanism provides a molecular basis for treating androgen-dependent diseases.
6'-O-Galloyl Peony Glycoside exerts antitumor effects through multiple signaling pathways, including:
6'-O-Galloyl Peony glycoside reduces the production of pro-inflammatory cytokines by inhibiting NF-κB and MAPK signaling pathways, thereby alleviating inflammatory responses. At the same time, its phenolic hydroxyl structure imparts radical scavenging activity, protecting cells from oxidative damage.
Druggability evaluation is a crucial step in the development of natural products. The molecular weight of 6'-O-gallyl white peony is 632.5710, slightly above the ideal range for traditional oral drugs (<500 Da), but its LogP value of 1.198 indicates moderate lipid solubility, which is beneficial for cell membrane penetration. A higher TPSA (238.97 Ų) suggests strong polarity, which may affect oral bioavailability.
Moderate water solubility (0.3318 mg/mL), which is beneficial for formulation development. The blood-brain barrier has low permeability, reducing the risk of central nervous system side effects. Negative hERG channel inhibition and Ames test negative indicate low cardiotoxicity and mutagenic risks, indicating good safety.
In terms of pharmacokinetics, current research is relatively limited. Preliminary in vivo experiments show that this compound is slowly absorbed orally and widely distributed in the body, mainly metabolized by the liver, with excretion primarily via the kidneys. The metabolites are not yet fully understood, and future research combining metabolomics and pharmacokinetics will require in-depth exploration of their in vivo behavior.
6'-O-Galacyl White Peony Glycoside, as a natural monoterpene glycoside with multiple pharmacological activities, shows broad clinical application potential. Its androgen antagonistic activity gives it potential value in adjunctive therapy for prostate diseases, especially prostate cancer and benign prostatic hyperplasia. Its antitumor activity provides a theoretical basis for its role as a candidate for new anti-cancer drugs, especially in combination chemotherapy and immunotherapy that warrant further exploration.
Moreover, its anti-inflammatory and antioxidant properties give it certain application prospects in the prevention and treatment of chronic inflammatory diseases, metabolic syndrome, and neurodegenerative diseases. Its plant metabolic regulatory function also provides new ideas for agricultural biotechnology.
Future research should focus on:
6'-O-Galloyl White Peony Glycoside, as an important monoterpene glycoside natural product in peony medicine, has become a hot topic in natural product pharmacology research due to its unique chemical structure and diverse biological activities. Its multiple mechanisms of action include androgen antagonism, anti-tumor, anti-inflammatory, and antioxidant effects, providing new ideas and potential drug candidates for the treatment of related diseases. Although research on its pharmacokinetics and clinical applications is still in its early stages, as research deepens, 6'-O-gallacyl peony glycoside is expected to become one of the key directions for natural drug development. In the future, multidisciplinary research combining modern medicinal chemistry, molecular biology, and clinical medicine will further promote its clinical translation and benefit human health.
Shenshuai
Wenjing
Hedandan
