Product Name: Specioside
Synonym name:
Catalogue No.: SBP01750
Cas No.: 72514-90-0
Formula: C₂₄H₂₈O₁₂
Mol Weight: 508.476
Physical Description: Powder

Purity: 95%~99%
Analysis Method: HPLC-DAD or/and HPLC-ELSD
Identification Method: Mass, NMR
Packing: Brown vial or HDPE plastic bottle
Can be supplied from milligrams to grams. Inquire for bulk scale.

For Reference Standard and R&D, Not for Human Use Directly.

Storage conditions：Short-term storage at 2~8℃, long-term storage at -20 ~ -80℃

Research progress in pharmacology of a novel natural product of iridoid glycosides, Specioside

Introduction/Overview

Natural products, as an important source of drug discovery, have always held an irreplaceable position in the history of human disease prevention and treatment. Iridoid glycosides are a class of important secondary metabolites widely present in the plant kingdom, which have attracted much attention due to their structural diversity and significant biological activity. Specioside, also known as [1S - (1 α, 4a α, 6 α, 7 α, 7a α)] -1,4a, 5,6,7,7a - hexahydro-1,6-dihydroxy-7-methylcyclopentane [c] pyran-4-carboxylic acid methyl ester -6- β - D-glucopyranose, is a glycoside derived from the Bignoniaceae plant（Catalpa speciosa A novel iridoid glycoside compound isolated and identified in Warder. Since its first report, golden dendrobine has gradually become one of the hot molecules in natural product chemistry and pharmacology research due to its unique chemical structure and various pharmacological activities.

Golden Tree（Catalpa speciosa）Also known as the American catalpa tree, it is native to the Midwest region of North America and is widely introduced and cultivated as an ornamental and timber tree species. In traditional medicine, the genus Ziziphus（Catalpa）The bark, fruit, and leaves of plants are used to treat various diseases such as fever, inflammation, skin diseases, and parasitic infections. As one of the characteristic components of this genus of plants, the discovery of golden tree glycosides not only enriches the chemical diversity of iridoid glycosides, but also provides an important material basis for explaining the traditional medicinal value of Zizania plants.

In recent years, with the advancement of separation and analysis techniques and the improvement of pharmacological evaluation systems, significant progress has been made in the research of golden tree glycosides. Research has shown that this compound has various pharmacological activities such as anti-inflammatory, antioxidant, anti-tumor, hepatoprotective, and neuroprotective effects. Its mechanism of action involves regulating multiple signal transduction pathways and molecular targets. In addition, Golden Tree Glycosides exhibit excellent pharmacological characteristics, including low toxicity, no hepatotoxicity and cardiotoxicity, and no crossing of the blood-brain barrier, laying the foundation for further drug development. This article will provide a systematic review of the research progress of golden dendrobine from the aspects of chemical structure and physicochemical properties, plant sources and extraction methods, pharmacological activity research, mechanism of action and molecular targets, drug evaluation and pharmacokinetics, as well as clinical application prospects.

Chemical structure and physicochemical properties

Chemical structural characteristics

Golden tree glycoside belongs to the iridoid glycoside class of compounds, and its parent structure is an iridoid skeleton, which is a bicyclic monoterpene structure formed by the condensation of cyclopentane ring and dihydropyran ring. Specifically, the aglycone of Golden Tree Glycoside is 1,4-alpha, 5,6,7,7a-hexahydro-1,6-dihydroxy-7-methylcyclopentane [c] pyran-4-carboxylic acid methyl ester, with one hydroxyl group attached to each of the C-1 and C-6 positions, one methyl group attached to the C-7 position, and a methoxycarbonyl group (- COOCH ∝) at the C-4 position. On the C-6 hydroxyl group, a molecule of D-glucose is connected by a β - glycosidic bond to form a complete cyclic iridoid glycoside structure.

The absolute configuration of Golden Tree Glycoside is [1S - (1 α, 4a α, 6 α, 7 α, 7a α)], and this stereochemical feature determines its specific spatial conformation and biological activity. Compared with compounds of the same genus such as catalpol, golden dendrobine has an additional glucose substituent at the C-6 position and a methyl group instead of a hydroxymethyl group at the C-7 position. These structural differences endow golden dendrobine with unique physicochemical properties and biological activity spectrum.

Physical and chemical property parameters

According to the compound information, the molecular formula of Golden Tree Glycoside is C ₂₄ H ∝₆ O ₁∝, with a molecular weight of 524.4700 g/mol. The LogP of its lipid water partition coefficient is -2.0000, indicating that the compound has strong hydrophilicity and high solubility in water, but low solubility in lipid soluble media. This property is closely related to the presence of multiple hydroxyl groups in its molecule (including two hydroxyl groups on the aglycone and four hydroxyl groups on glucose) as well as the sugar moiety.

The Topological Polar Surface Area (TPSA) of Golden Tree Glycosides is 200000 Å ², which is much higher than the upper limit of 140 Å ² typically required for oral medication, indicating that this compound may have poor oral absorption. In addition, the TPSA value is consistent with its characteristic of not crossing the blood-brain barrier (BBB), as molecules with TPSA greater than 90 Å ² are generally considered difficult to cross the blood-brain barrier.

In terms of hydrogen bond acceptors, Golden Tree Glycoside contains 12 hydrogen bond acceptors (including hydroxyl oxygen, ether oxygen, and carbonyl oxygen), as well as multiple hydrogen bond donors (hydroxyl hydrogen). These hydrogen bond sites not only determine their interaction mode with biomolecules such as proteins and nucleic acids, but also affect their solubility and membrane permeability.

Spectral characteristics and identification

The structural identification of golden tree glycosides usually relies on nuclear magnetic resonance spectroscopy (NMR) and mass spectrometry (MS) techniques. In the ¹ H NMR spectrum, the characteristic signals of the iridoid skeleton include: H-1 proton (δ 4.5-5.5 ppm, bimodal, J ≈ 7-8 Hz， Coupling with glucose end group protons), H-3 protons (δ 6.0-7.5 ppm, unimodal or broad peak, characteristic olefin protons of cyclohexene ether terpenes), H-7 methyl (δ 1.0-1.5 ppm, bimodal), and glucose end group protons (δ 4.5-5.0 ppm, bimodal), J ≈ 7-8 Hz， Indicating the β configuration. In the ¹ ³ C NMR spectrum, C-4 carbonyl carbon (δ 165-170 ppm), C-3 ene carbon (δ 140-150 ppm), and glucose end group carbon (δ 95-105 ppm) are key diagnostic signals.

High resolution mass spectrometry (HR-MS) can provide precise molecular weight information, combined with fragment ion patterns, which helps to confirm molecular formulas and distinguish structurally similar compounds. In UV spectroscopy, iridoid glycosides typically exhibit characteristic absorption at 230-240 nm, belonging to the chromophores of α, β - unsaturated esters or lactones.

Plant sources and extraction methods

Main plant sources

Golden tree glycoside was originally derived from the golden tree（Catalpa speciosa The plant was isolated from Warder and belongs to the Bignoniaceae family, Zizania genus（Catalpa）. There are about 11 species of Ziziphus worldwide, mainly distributed in East Asia and North America. Except for the Golden Tree, other catalpa plants such as the catalpa tree（Catalpa ovata G. Don）、 Catalpa tree（Catalpa bungei C. A. Mey.) and Yunnan catalpa（Catalpa fargesii Bureaus and others have also been reported to contain golden tree glycosides, but the content varies.

In terms of plant organ distribution, golden glycosides are mainly present in leaves, bark, and fruits, with higher levels typically found in young leaves and bark. Research has shown that the content of glycosides in golden tree leaves varies seasonally, reaching its peak from summer to autumn, which may be related to the regulatory mechanism of plant secondary metabolism. In addition, there are significant differences in the content of arbutin in plant materials from different origins and growth stages, which poses requirements for quality control and resource development of medicinal materials.

In recent years, there have been reports of other genera of plants in the family Verbenaceae, such as the genus Lingxiao, in addition to the plants of the genus Zizania（Campsis）The presence of golden dendrobine was also detected in the plant, indicating that this compound may have a wider distribution in plants of the Wisteriaceae family. However, currently the main source of golden tree glycosides is still dominated by plants in the genus Zizania.

extraction method

As a highly polar cyclic terpenoid glycoside, the extraction of golden tree glycosides is usually carried out using a polar solvent system. Traditional extraction methods include solvent impregnation, reflux extraction, and percolation. The commonly used extraction solvents are methanol, ethanol, or their aqueous solutions, among which 50% -80% ethanol aqueous solution is widely used due to balancing polarity and extraction efficiency. The extraction temperature is generally controlled at 40-60 ℃, and excessively high temperatures may lead to hydrolysis or degradation of glycoside compounds.

In order to improve extraction efficiency and selectivity, various modern extraction techniques have been applied in recent years for the extraction of golden dendrobine. Ultrasound assisted extraction (UAE) utilizes the cavitation effect of ultrasound to destroy plant cell walls, accelerate solvent permeation and solute diffusion, and achieve high extraction rates in a short period of time. Microwave assisted extraction (MAE) rapidly increases the internal temperature of plant cells through microwave heating, leading to cell rupture and promoting the release of target compounds. Research has shown that using microwave-assisted extraction of golden dendrobine can shorten the extraction time from several hours in traditional methods to several minutes, and increase the extraction rate by 20% -30%.

Enzyme assisted extraction (EAE) is another green and efficient extraction method. By adding cell wall degrading enzymes such as cellulase and pectinase, the structure of plant cell walls can be disrupted, promoting the release of arbutin. This method has mild conditions and can avoid the damage of high temperature to the active ingredients, making it particularly suitable for the extraction of thermosensitive compounds.

Separation and purification

The separation and purification of glycosides from crude extracts usually require the use of multiple chromatographic techniques. Macroporous adsorption resins (such as D101, AB-8, etc.) are commonly used for preliminary separation. Gradient elution can effectively remove impurities such as sugars and tannins, and enrich iridoid glycosides. Silica gel column chromatography using chloroform methanol water system as the mobile phase can achieve the preliminary separation of golden glycosides and structurally similar compounds.

High performance liquid chromatography (HPLC) and preparative high-performance liquid chromatography (Prep HPLC) are key technologies for obtaining high-purity golden glycosides. The commonly used stationary phase is a C18 reverse phase column, and the mobile phase is a methanol water or acetonitrile water system. By optimizing the gradient program, baseline separation of golden glycosides can be achieved. High speed counter current chromatography (HSCCC), as a liquid-liquid distribution chromatography technique, has the advantages of high sample recovery rate and less irreversible adsorption. In recent years, it has also been successfully applied to the separation and purification of aucubin.

In terms of quality control, thin layer chromatography (TLC) and high-performance liquid chromatography ultraviolet detection (HPLC-UV) are commonly used qualitative and quantitative analysis methods. With the popularization of mass spectrometry technology, liquid chromatography-mass spectrometry (LC-MS) method has become the preferred tool for determining the content and metabolite identification of arbutin due to its high sensitivity and selectivity.

Pharmacological activity research

anti-inflammatory activity

Inflammation is the body's defense response to harmful stimuli, but excessive or sustained inflammation is closely related to the occurrence and development of various diseases. Golden tree glycosides exhibit significant anti-inflammatory activity in various inflammatory models. In a macrophage model stimulated by lipopolysaccharides (LPS), golden glycosides can dose dependently inhibit the production of nitric oxide (NO) and prostaglandin E ₂ (PGE ₂), while reducing the expression levels of pro-inflammatory cytokines such as tumor necrosis factor - α (TNF - α), interleukin-1 β (IL-1 β), and interleukin-6 (IL-6).

In the in vivo inflammation model, golden dendrobine showed significant inhibitory effects on xylene induced mouse ear swelling and carrageenan induced rat toe swelling. In addition, in chronic inflammation models such as adjuvant arthritis models, quercetin can reduce joint swelling, lower serum levels of inflammatory factors, and inhibit synovial tissue proliferation and the formation of vascular opacities.

antioxidant activity

Oxidative stress is the common pathological mechanism of many diseases, including cardiovascular diseases, neurodegenerative diseases, diabetes and its complications. The antioxidant activity of Golden Tree Glycosides has been confirmed in various in vitro and in vivo models. In chemical antioxidant experiments, golden dendrobine can effectively scavenge 1,1-diphenyl-2-trinitrophenylhydrazine (DPPH) free radicals, 2,2 '- diazobis (3-ethylbenzothiazole-6-sulfonic acid) (ABTS) cationic free radicals, and hydroxyl free radicals, and its activity is concentration dependent.

In cell models, golden dendrobine can alleviate oxidative damage induced by hydrogen peroxide (H ₂ O ₂), reduce intracellular reactive oxygen species (ROS) levels, increase the activity of antioxidant enzymes such as superoxide dismutase (SOD), glutathione peroxidase (GSH Px), and catalase (CAT), while reducing the production of lipid peroxidation products such as malondialdehyde (MDA). In animal models, golden dendrobine can alleviate liver oxidative damage induced by carbon tetrachloride (CCl ₄) and protect liver tissue morphology and function.

Antitumor activity

The anti-tumor activity of Golden Tree Glycosides has been one of the hot topics in recent years. In vitro experiments have shown that goldenrod has inhibitory effects on the proliferation of many tumor cell lines, including human liver cancer cells (HepG2), human breast cancer cells (MCF-7), human lung cancer cells (A549), human colon cancer cells (HT-29) and human melanoma cells (A375). The half maximal inhibitory concentration (IC ₅₀) value varies depending on the cell type and is generally within the range of 10-50 μ M.

It is worth noting that Golden Tree Glycosides have low toxicity to normal cells (such as human liver cell L02 and human umbilical vein endothelial cell HUVEC) and exhibit certain selective anti-tumor activity. Further research has found that Golden Tree Glycosides can exert anti-tumor effects by inducing cell cycle arrest and apoptosis. In HepG2 cells, treatment with kaempferol resulted in cell cycle arrest in the G0/G1 phase, accompanied by downregulation of Cyclin D1 and cyclin dependent kinase 4 (CDK4) expression, as well as upregulation of p21 and p27 expression. At the same time, Golden Tree Glycosides can activate the mitochondrial apoptosis pathway, leading to a decrease in mitochondrial membrane potential, release of cytochrome c, and activation of caspase-9 and caspase-3.

Hepatoprotective activity

The liver is the main organ for drug metabolism and detoxification, as well as a target for various diseases. The hepatoprotective activity of Golden Tree Glycosides has been validated in various liver injury models. In a mouse model of acute liver injury induced by CCl ₄, pre-treatment with kaempferol can significantly reduce serum transaminase (ALT, AST) levels, alleviate pathological damage to liver tissue (including hepatocyte necrosis, steatosis, and inflammatory infiltration), and improve the liver's antioxidant defense system.

In the model of alcoholic liver injury, quercetin can inhibit alcohol induced hepatic steatosis, reduce hepatic triglyceride (TG) content, and alleviate oxidative stress and endoplasmic reticulum stress response. In addition, in the non-alcoholic fatty liver disease (NAFLD) model, quercetin can improve hepatic lipid deposition and insulin resistance induced by high-fat diet, and its effect is related to regulating the expression of lipid metabolism related genes and inhibiting inflammatory signaling pathways.

Neuroprotective activity

Although Golden Tree Glycosides do not cross the blood-brain barrier, recent studies have found that they can still indirectly exert neuroprotective effects by regulating peripheral immune and metabolic pathways. In the model of cerebral ischemia-reperfusion injury, quercetin can reduce the volume of cerebral infarction and improve the neurological deficit score. Its mechanism may be related to the inhibition of inflammatory response and oxidative stress.

In the Alzheimer's disease (AD) model, golden dendrobine can improve cognitive dysfunction induced by β - amyloid protein (A β), reduce hippocampal A β deposition and tau protein hyperphosphorylation. It is worth noting that Golden Tree Glycosides can also regulate the composition of gut microbiota, increase the abundance of short chain fatty acid producing bacteria, and exert neuroprotective effects through the gut brain axis pathway. This provides a new perspective for understanding the contradictory phenomenon of its neuroprotective activity without crossing the blood-brain barrier.

Other activities

In addition to the main activities mentioned above, Golden Tree Glycosides also exhibit various pharmacological activities such as antibacterial, antiviral, hypoglycemic, and immune regulatory effects. In antibacterial experiments, golden tree glycosides have an effect on Staphylococcus aureus（Staphylococcus aureus）And Staphylococcus epidermidis（Staphylococcus epidermidis）Gram positive bacteria have a certain inhibitory effect. In terms of antiviral effects, Golden Tree Glycosides can inhibit the replication of influenza virus and herpes simplex virus. In terms of reducing blood sugar, goldenrod can improve the abnormal glucose tolerance of diabetes mice, promote insulin secretion, and reduce insulin resistance. In terms of immune regulation, Golden Tree Glycosides can regulate the proportion of T cell subsets, enhance the activity of natural killer cells (NK cells), and promote macrophage phagocytic function.

Mechanism of action and molecular targets

Anti inflammatory mechanism

The anti-inflammatory effect of Golden Tree Glycosides involves the regulation of multiple signaling pathways. Research has shown that golden dendrobine can inhibit the activation of the nuclear factor kappa B (NF - κ B) signaling pathway. In LPS stimulated macrophages, treatment with kaempferol can inhibit the phosphorylation and degradation of I κ B α, thereby preventing the translocation of NF - κ B p65 subunit to the nucleus and reducing the transcription of downstream inflammatory genes. In addition, Golden Tree Glycosides can also inhibit the mitogen activated protein kinase (MAPK) signaling pathway, including phosphorylation of p38 MAPK, c-Jun N-terminal kinase (JNK), and extracellular signal regulated kinase (ERK).

In recent years, research has found that the anti-inflammatory activity of golden tree glycosides is also related to the regulation of NLRP3 inflammasome. NLRP3 inflammasome is a multi protein complex whose activation promotes caspase-1 activation and maturation and secretion of IL-1 β and IL-18. Golden tree glycosides can inhibit the assembly and activation of NLRP3 inflammasomes, reduce the cleavage of caspase-1 and the release of IL-1 β, thereby alleviating the inflammatory response.

Antioxidant mechanism

The antioxidant effect of Golden Tree Glycosides is mainly achieved through two pathways: direct clearance of free radicals and activation of endogenous antioxidant defense systems. In terms of directly eliminating free radicals, multiple hydroxyl groups in the molecule of golden tree glycosides can serve as hydrogen atom donors, neutralize free radicals, and block free radical chain reactions. In terms of activating the endogenous antioxidant system, golden dendrobine can activate the nuclear factor E2 related factor 2 (Nrf2)/antioxidant response element (ARE) signaling pathway. Nrf2 is a key transcription factor that regulates the expression of antioxidant enzymes. Under normal conditions, it binds to Kelch like ECH related protein 1 (Keap1) and remains inactive. Golden tree glycosides can promote the dissociation of Nrf2 and Keap1, causing them to translocate into the nucleus and bind to ARE, initiating the transcription of downstream antioxidant enzyme genes such as SOD, CAT, HO-1, NQO1, etc.

Antitumor mechanism

The anti-tumor mechanism of Golden Tree Glycosides involves multiple levels. In terms of cell cycle regulation, golden dendrobine can upregulate the expression of cell cycle inhibitory proteins such as p21 and p27, inhibit the activity of Cyclin D1/CDK4 and Cyclin E/CDK2 complexes, and thus block the cell cycle in the G0/G1 phase. In terms of apoptosis induction, golden dendrobine can activate the mitochondrial apoptosis pathway, leading to an increase in Bax/Bcl-2 ratio, a decrease in mitochondrial membrane potential, release of cytochrome c, and activation of caspase cascade reaction. In addition, Golden Tree Glycosides can activate the death receptor pathway, upregulate the expression of Fas and FasL, and promote the activation of caspase-8.

In recent years, studies have found that quercetin can also exert anti-tumor effects by inhibiting the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt)/mammalian rapamycin target protein (mTOR) signaling pathway. This pathway plays a critical role in tumor cell proliferation, survival, and metabolism. Golden tree glycosides can inhibit the phosphorylation of Akt, reduce the activity of mTOR and its downstream effector factors p70S6K and 4E-BP1, thereby inhibiting protein synthesis and growth of tumor cells.

Liver protection mechanism

The hepatoprotective effects of Golden Tree Glycosides involve multiple mechanisms such as antioxidant, anti-inflammatory, and anti apoptotic effects. In the CCl ₄ - induced liver injury model, quercetin can enhance liver antioxidant capacity by activating the Nrf2/ARE pathway, while inhibiting the NF - κ B pathway to alleviate inflammatory response. In the model of alcoholic liver injury, quercetin can inhibit the activity of cytochrome P450 2E1 (CYP2E1), reduce ROS produced by alcohol metabolism, and activate the AMP activated protein kinase (AMPK) signaling pathway, promoting fatty acid oxidation and inhibiting lipid synthesis, thereby reducing liver steatosis.

In a non-alcoholic fatty liver disease model, quercetin can promote fatty acid oxidation and inhibit de novo lipid synthesis by regulating the expression of peroxisome proliferator activated receptor alpha (PPAR alpha) and steroid regulatory element binding protein 1c (SREBP-1c). In addition, Golden Tree Glycosides can also inhibit endoplasmic reticulum stress response, reduce the expression of CHOP and caspase-12, thereby alleviating liver cell apoptosis.

molecular target

Based on existing research, the molecular targets of Golden Tree Glycosides can be classified into the following categories: (1) Signal transduction proteins, including NF - κ B p65, I κ B α, p38 MAPK, JNK, ERK, Akt, mTOR, AMPK, Nrf2, Keap1, etc; (2) Inflammation related proteins: including NLRP3, ASC, caspase-1, COX-2, iNOS, etc; (3) Cell cycle regulatory proteins: including Cyclin D1, CDK4, p21, p27, etc; (4) Apoptosis related proteins: including Bax, Bcl-2, caspase-3, caspase-8, caspase-9, PARP, etc; (5) Metabolic related proteins: including PPAR alpha, SREBP-1c, CYP2E1, etc.

It should be pointed out that current research on the direct targets of action of Golden Tree Glycosides is still relatively limited. Most studies indirectly infer the mechanism of action based on observed effects in cell and animal models, while direct targets (such as binding sites and binding modes with specific proteins) still need to be further confirmed through methods such as surface plasmon resonance (SPR), drug affinity response target stability (DARTS), and cellular thermal transition analysis (CETSA).

Evaluation of drug properties and pharmacokinetics

Analysis of drug properties parameters

Drug lethality evaluation is an important basis for determining whether candidate compounds can enter clinical development. According to the compound information, the molecular weight of Golden Tree Glycoside is 524.4700, slightly higher than the threshold of molecular weight less than 500 in Lipinski's Rule of Five. Its LogP is -2.0000, far below the upper limit of 5, indicating that the compound has strong hydrophilicity and may have poor membrane permeability. The number of hydrogen bond receptors is 12, exceeding the upper limit of 10, further indicating that oral absorption may be limited. The TPSA is 200000 Å ², much higher than the threshold of 140 Å ², consistent with poor oral absorption and non crossing of the blood-brain barrier.

However, Golden Tree Glycosides exhibit significant advantages in terms of safety. The predicted results show that the compound has no hepatotoxicity, no cardiotoxicity, and no hERG inhibitory activity, indicating that it has a high safety window. The Ames test results are unknown, but based on the structural characteristics of its iridoid glycosides and existing research, the risk of genetic toxicity is low.

Overall, Golden Tree Glycosides meet some of the criteria for "drug like properties", but there are significant deficiencies in oral absorption. This feature suggests that Golden Tree Glycosides may be more suitable for development as injectable or topical formulations, rather than traditional oral formulations. In addition, improving its membrane permeability through structural modification or formulation techniques (such as nanocarriers, prodrug design, etc.) is also a feasible strategy to enhance its drug properties.

Pharmacokinetic characteristics

At present, systematic research on the pharmacokinetics of Golden Tree Glycosides is still relatively limited. Based on its physicochemical properties and existing research, its pharmacokinetic characteristics can be preliminarily inferred. In terms of absorption, the high hydrophilicity and large polar surface area of Golden Tree Glycosides result in lower oral bioavailability. Animal experiments have shown that after oral administration, the blood concentration of golden dendrobine is lower and the peak time (Tmax) is longer, indicating slow and incomplete absorption. In terms of distribution, golden tree glycosides are mainly distributed in extracellular fluid and have a wide tissue distribution but low concentration. Due to its non crossing of the blood-brain barrier, the concentration in the central nervous system can be ignored, which to some extent limits its application in the treatment of neurological diseases, but also avoids central nervous system related side effects.

In terms of metabolism, iridoid glycosides can usually undergo deglycosylation under the action of gut microbiota, producing aglycones or secondary glycosides. The glucosyl portion of golden glucoside can be hydrolyzed by β - glucosidase of intestinal bacteria, releasing aglycones. Glycosides may undergo further phase II metabolic reactions such as methylation, hydroxylation, and glucuronic acid binding. The cytochrome P450 enzyme system in the liver may also be involved in the oxidative metabolism of quercetin.

In terms of excretion, golden dendrobine and its metabolites are mainly excreted through urine and bile. Due to its large molecular weight and strong hydrophilicity, glomerular filtration and tubular secretion may be the main excretion pathways. After bile excretion, some metabolites can enter the enterohepatic circulation, prolonging their retention time in the body.

Formulation strategy

Multiple formulation strategies are currently being explored to address the issue of poor oral absorption of Golden Tree Glycosides. Liposomes, nanoparticles, and microemulsions, among other nano delivery systems, can enhance the encapsulation efficiency and bioavailability of kaempferol. For example, encapsulating golden dendrobine in poly (lactic acid glycolic acid) copolymer (PLGA) nanoparticles can significantly improve its oral bioavailability and prolong the drug's circulation time in the body. Phospholipid complex technology can improve the lipid solubility of glycosides by forming drug phospholipid complexes, promoting their passive diffusion through intestinal epithelial cells.

Pre drug design is another promising strategy. By introducing lipophilic groups (such as acetyl, palmitoyl, etc.) on the hydroxyl or carboxyl groups of golden glycosides, their membrane permeability can be improved. The prodrug releases active parent drug after enzymatic or chemical hydrolysis in the body, thereby achieving the goal of improving bioavailability. In addition, coupling golden dendrobine with specific ligands (such as vitamins, peptides, etc.) can achieve targeted delivery, improve therapeutic efficacy, and reduce side effects.

Clinical application prospects and prospects

Potential indications

Based on the multifaceted pharmacological activities of Golden Tree Glycosides, they have potential application value in the treatment of various diseases. In terms of inflammatory diseases, Golden Tree Glycosides can be used to treat rheumatoid arthritis, inflammatory bowel disease, dermatitis, etc. It has strong anti-inflammatory activity and high safety, and is expected to be developed as a new type of anti-inflammatory drug. In terms of liver diseases, the hepatoprotective activity of golden dendrobine makes it promising for the treatment of alcoholic liver disease, non-alcoholic fatty liver disease, drug-induced liver injury, and other diseases. In terms of tumor treatment, the selective anti-tumor activity of Golden Tree Glycoside suggests that it can be used as a chemotherapy sensitizer or adjuvant therapy drug, combined with conventional chemotherapy drugs to improve efficacy and reduce low toxicity.

In addition, the antioxidant and neuroprotective activities of Golden Tree Glycosides provide possibilities for their application in aging related diseases and neurodegenerative diseases. Although it does not cross the blood-brain barrier, the discovery that it indirectly exerts neuroprotective effects by regulating peripheral immune and metabolic pathways has opened up new ideas for its application in diseases such as Alzheimer's disease and Parkinson's disease. In terms of metabolic diseases, the hypoglycemic and lipid-lowering activities of goldoside make it potentially valuable in the treatment of type 2 diabetes and its complications.

Research Challenges and Future Directions

Although significant progress has been made in the research of golden tree glycosides, there are still many challenges to clinical application. Firstly, the pharmacokinetic characteristics of Golden Tree Glycosides are not yet clear, especially the issue of low oral bioavailability that urgently needs to be addressed. In the future, systematic pharmacokinetic studies are needed to clarify its absorption, distribution, metabolism, and excretion processes in the body, providing a basis for formulation design and optimization of dosing regimens.

Secondly, the direct molecular target of Golden Tree Glycosides is not yet clear. Current research is mostly based on indirect inference of its mechanism of action from observed effects in cell and animal models, while direct target identification is crucial for a deeper understanding of its pharmacological effects, optimization of molecular structure, and prediction of potential side effects. In the future, methods such as chemical proteomics, biophysical chemistry, and computational chemistry should be combined to systematically identify the direct binding proteins of arbutin.

Thirdly, the preclinical safety evaluation of Golden Tree Glycosides is not yet complete. Although the predicted results show that it has no hepatotoxicity or cardiotoxicity, research on long-term toxicity, reproductive toxicity, genetic toxicity, and carcinogenicity still needs to be conducted. In addition, the interaction between Golden Tree Glycosides and other drugs is also worth paying attention to.

Fourthly, the issue of resource sustainability of golden tree glycosides needs to be addressed. At present, the golden tree glycoside is mainly extracted from plants of the Zizania genus, but the content in plants is relatively low and the extraction cost is high. In the future, sustainable production of arbutin can be achieved through biotechnology methods such as plant tissue culture, hairy root culture, and synthetic biology. In addition, the development of chemical synthesis or semi synthesis routes is also a feasible way to solve resource problems.

prospect

With the continuous development of natural product chemistry, pharmacology, and drug development technology, research on golden tree glycosides will usher in new opportunities. On the one hand, structure based drug design (SBDD) and computer-aided drug design (CADD) techniques can be used to optimize the structure of golden glycosides, enhance their activity and drug properties. On the other hand, the application of multi omics technologies such as transcriptomics, proteomics, and metabolomics will help to comprehensively reveal the mechanism of action and molecular target network of glycosides.

In addition, further exploration is warranted on the synergistic effects of Golden Tree Glycosides with other natural products or clinical drugs. The combination therapy of natural products has shown unique advantages in the treatment of complex diseases due to its multi-target and multi pathway effects. The combined application of Golden Tree Glycosides with active ingredients such as Zichun, Baicalin, and Curcumin may produce synergistic effects, which is worthy of further research.

Finally, the medicinal value of Golden Tree Glycosides in traditional medicine needs to be validated and elucidated using modern scientific methods. By integrating traditional medication experience with modern pharmacological research results, it is expected to develop golden dendrobine into a new type of natural medicine with independent intellectual property rights, contributing to the cause of human health.

Conclusion

As a novel cyclohexene ether terpenoid glycoside isolated and identified from the Golden Tree, Golden Tree Glycoside has become an important object of natural product pharmacology research due to its unique chemical structure and multifaceted pharmacological activities. This article systematically reviews the research progress on the chemical structure and physicochemical properties, plant sources and extraction methods, pharmacological activity research, mechanism of action and molecular targets, pharmacological evaluation and pharmacokinetics, as well as clinical application prospects of golden tree glycosides.

Existing studies have shown that golden dendrobine has various pharmacological activities such as anti-inflammatory, antioxidant, anti-tumor, hepatoprotective, and neuroprotective effects. Its mechanism of action involves regulating multiple signaling pathways such as NF - κ B, MAPK, Nrf2/ARE, PI3K/Akt/mTOR, AMPK, etc. In terms of medicinal properties, golden dendrobine exhibits good safety characteristics, but its low oral bioavailability limits its clinical application. Future research should focus on elucidating pharmacokinetic characteristics, identifying direct molecular targets, developing formulation technologies, and addressing resource sustainability issues.

With the continuous deepening of research, golden dendrobine is expected to become a new candidate drug for the treatment of inflammatory diseases, liver diseases, tumors, and metabolic diseases. Natural products are an important source of drug discovery, and the study of golden glycosides not only enriches the chemical and pharmacological knowledge of iridoid glycosides, but also provides an example for mining active ingredients from traditional medicinal plants. I believe that in the near future, golden dendrobine will move from the laboratory to clinical practice and make its due contribution to the cause of human health.