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D-Tetrandrine is a biologically active dianilide isoquinoline alkaloid with significant pharmacological activity. It is mainly extracted from the roots of the traditional Chinese medicine plant Aconitum dianthum. Its molecular structure is complex, characterized by the connection of two isoquinoline units through an ether bond, presenting a unique stereoconfiguration, which directly determines the specificity of its pharmacological effects. This compound typically appears as a white to off-white crystalline powder, odorless and slightly bitter in taste, and has good solubility in common organic solvents such as chloroform or ethanol.Apart from its direct therapeutic potential, it is also regarded as a classic tool drug for studying calcium ion-mediated physiological processes.However, its clinical application also requires attention to potential adverse reactions such as liver and kidney toxicity, reflecting the complexity of the benefits and risks when natural products are used as drugs.
|
Chemical Formula |
C38H42N2O6 |
|
Exact Mass |
622 |
|
Molecular Weight |
623 |
|
m/z |
622 (100.0%), 623 (41.1%), 624 (8.2%), 624 (1.2%) |
|
Elemental Analysis |
C, 73.29; H, 6.80; N, 4.50; O, 15.41 |
D-powafimazine is best known for its non-selective calcium channel blockade pharmacological effect, which can effectively inhibit calcium ion influx, thereby relaxing vascular smooth muscle and reducing peripheral vascular resistance. This makes it an important component in the clinical treatment of hypertension. Additionally, extensive scientific research has revealed its potential pharmacological activities such as anti-inflammatory, anti-fibrotic, immunosuppressive, and anti-tumor effects, with the mechanism involving the regulation of multiple cellular signaling pathways, such as the NF-κB and MAPK pathways.
D-Tetrandrine Use:
1. Use in Immune System Diseases
As a natural alkaloid with immunomodulatory activity, D-tetrandrine exhibits significant inhibitory effects on the progression of inflammatory arthritis. It can effectively alleviate joint swelling, relieve inflammatory responses, and improve clinical symptoms in related conditions. Pharmacodynamic studies have shown that its therapeutic effect is stronger than that of aspirin, supporting its clinical application as an adjunct or alternative agent for the treatment of rheumatoid arthritis and other immune-related joint disorders.
2. Use in Cardiovascular Diseases
D-tetrandrine possesses notable calcium antagonistic properties in the cardiovascular system. It can inhibit both T-type and L-type calcium channels in ventricular myocytes, interact with M receptors, and block calcium-activated potassium channels. Through these multi-target mechanisms, it helps regulate cardiac electrical activity and stabilize heart rhythm, providing a safe and effective clinical strategy for the management of paroxysmal supraventricular tachycardia.
3. Use in Digestive System Diseases
In the digestive system, D-tetrandrine exerts protective effects on hepatocytes and resists the progression of liver pathological changes. It can reduce hepatocyte damage caused by multiple pathogenic factors, inhibit the activation of hepatic stellate cells, and reduce collagen deposition. Therefore, it plays a positive role in preventing liver fibrosis and maintaining normal liver structure and function, showing potential value in chronic liver protection.
4. Use in Ocular Inflammatory Diseases
D-tetrandrine is also applied in the treatment of various ocular inflammatory conditions. It can suppress local inflammatory reactions, relieve tissue edema and exudation, and improve ocular microcirculation. Clinical applications include the management of uveitis, keratitis, and certain retinopathies induced by inflammatory factors, helping to alleviate ocular discomfort and protect visual function.
5. Other Clinical Applications
D-tetrandrine shows obvious antagonistic effects against acute nephrotoxicity induced by streptomycin. It can reduce apoptosis and abnormal proliferation of renal tubular epithelial cells, thereby protecting renal function and alleviating renal injury caused by acute ischemia-reperfusion. Furthermore, it significantly reduces serum creatinine and urea nitrogen levels, improves glomerular filtration rate and renal plasma flow, and delays the development of glomerulosclerosis, presenting important value in renal protection.
Synthesis of D-tetrandrine:
The method belongs to the technical field of traditional Chinese medicine extraction, and specifically relates to a preparation method of tetrandrine. The preparation method of tetrandrine is as follows: after the crude drug of tetrandrine is crushed, it is extracted by ethanol reflux, combined with the extract, and purified by AB ‑ 8 resin column chromatography after reduced pressure concentration, followed by elution chromatography with purified water, 50% ethanol, 80% ethanol and 95% ethanol, and then 80% ethanol and 95% ethanol elution are collected and concentrated under reduced pressure, and then further purified by neutral alumina column chromatography, and the elution is obtained by dichloromethane elution chromatography column, The purified tetrandrine was obtained by recrystallization with acetone after concentration under reduced pressure. The preparation method of tetrandrine provided by this method is simple, efficient, and has high extraction rate. It can obtain pure tetrandrine with purity of more than 99%, and does not use organic solvents such as benzene and chloroform. It is green and energy-saving, and has no risk of harm to human health.
Extraction and separation of d-tetrandrine:
1. Extraction of total alkaloids and separation of lipophilic and hydrophilic alkaloids
Tetrandrine is an alkaloid, and the plant material is tetrandrine (root). The principle of extraction and separation is high content or main components and dissolution difference, which is called acid water percolation. The separation method is as follows:
2. Separation of tetrandrine A and B by low pressure column chromatography
Under low pressure (0.5~3kg/cm2, generally 0.3~1.2kg/cm2), the particle diameter of low pressure column chromatography is between 100~200 μ m) And HPLC (～ 37 μ m) Silica gel (or alumina) H or G (50 ～ 75 μ m) As a filling agent, a column chromatographic column has the same basic principle as HPLC, and the separation effect is also between the classical column and HPLC. The column is packed by the dry method of decompression, the layer is tight and uniform, and the distribution of chromatographic bands is centralized and neat. At the same time, the best separation solvent system of thin layer chromatography can be directly used for low pressure column chromatography. It is a method with good separation effect, simple equipment, convenient operation and fast. Suitable for constant preparative separation of natural products.
(1) Column mounting
Decompression dry packing method, chromatographic column specification: column length is 30cm, inner diameter is 2cm, total silica gel is about 30g (height is about 22cm), 2.2 sample mixing and sample adding Take about 150mg of tetrandrine, add a small amount of acetone for hot dissolution (just soluble in degrees) and add it to 1.5g of silica gel with a dropper, carefully mix it, evaporate it on the water bath, grind it, carefully add it to the top of the column through a long-neck funnel, gently and vertically hit it, and cover it with about 1~2cm high blank silica gel when the surface of the sample is flat and not stirred, Then cover a circular filter paper and press it tightly.
(2) Elution
First check whether the pipelines from the air compressor to the chromatographic column are normal, close all valves, and start the air compressor to the rated pressure (5.8kg/cm2) for use. Carefully add a small amount of eluent (cyclohexane-ethyl acetate-diethylamine/6:2:0.8) to the column wall of the column with a dropper. When the liquid level reaches a certain height, add the remaining eluent again (about 250ml in total), quickly install a glass standard plug connector on the top of the column, press it tightly with an iron clip (to prevent the connector from flushing when pressurized), carefully open the air compressor valve, and then open the needle valve and air filter reducer, (Note: The pressure is too high. The glass column will explode, and it is generally safe to wear a protective mask if necessary.) Adjust the required pressure to 0.6~1.2 kg/cm2, and it will flow out after about 40 minutes. Control the flow rate of 1 ml/min, and collect 12~15 portions every 10 minutes. The whole process of elution is about 3 hours.
(3) Check
Each stream was transferred into a small glass evaporator, concentrated on a water bath, and passed TLC inspection respectively. Adsorbent: silica gel G, developing agent: cyclohexane ethyl acetate diethylamine/6:3:1, modified bismuth potassium iodide reagent spray color, tetrandrine A and B were used as standard controls, and the same components were combined to obtain crude A and B products, recrystallized with acetone, and determined.
In 1951, Chinese scientists isolated a compound with pharmacological activity from Chuanwu, and after studying it, determined its structure and named it "Tetrandrine". The name comes from the name of botanist T.T. Yu and the Latin root 'andr -', meaning 'male', indicating that it is extracted from male plant tissue.
Later, scientists discovered the existence of two optical isomers of Tetrandrine: D-Tetrandrine and L-Tetrandrine. The molecular structures of these two isomers are the same, but their optical activities are different. D-product has right-handed properties, while L-Tetrandrine has left-handed properties.
In order to distinguish between these two isomers, the scientific community began to prefix them with "D -" or "L -" to indicate their optical rotation properties. Therefore, it is a right-handed Tetrandrine, while L-Tetrandrine is a left-handed Tetrandrine.
The purpose of adding optical activity prefix in naming is to accurately describe the structure and properties of compounds and avoid confusion. This naming method is common in organic chemistry and can help scientists and researchers accurately identify and describe different compounds.
In summary, it is a dextral isomer of Tetrandrine, and its naming history stems from the initial separation and identification of this compound. By distinguishing the optical rotation properties, the scientific community can more accurately describe and study the characteristics and pharmacological activities of these two isomers.
What are the side effects of this compound?
Gastrointestinal discomfort: This compound may cause digestive symptoms such as nausea, vomiting, and upper abdominal discomfort. This may be due to the stimulating effect of drugs on the gastrointestinal mucosa.
Neurological reactions: Some patients may experience neurological symptoms such as dizziness, headache, and drowsiness after using this compound. This may be related to the inhibitory effect of drugs on the nervous system.
Facial pigmentation: Long term or excessive use of this compound may lead to facial pigmentation, affecting skin aesthetics. This may be related to the impact of drugs on the skin during metabolism and excretion in the body.
Effects on liver and kidney function: This compound needs to be metabolized and excreted by the liver and kidneys, so it may have certain effects on liver and kidney function. Especially for patients with liver and kidney dysfunction, extra attention should be paid when using it.
Allergic reactions: A very small number of patients may experience allergic reactions to this compound, manifested as rash, itching, difficulty breathing, and other symptoms. Once an allergic reaction occurs, the medication should be stopped immediately and medical treatment should be sought.
Other potential side effects: In addition to the common side effects mentioned above, this compound may also cause other potential side effects, such as palpitations, chest tightness, and decreased blood pressure. These side effects may be related to the impact of drugs on the cardiovascular system.
D-Tetrandrine is a bisbenzylisoquinoline alkaloid with diverse pharmacological activities and potential therapeutic applications. Its calcium channel-blocking, anti-inflammatory, anti-cancer, anti-fibrotic, and neuroprotective effects make it a promising candidate for the treatment of various diseases, including cardiovascular diseases, inflammatory and autoimmune diseases, cancer, fibrotic disorders, and neurological disorders. However, further research is needed to evaluate its efficacy and safety in humans, as well as to address issues such as poor bioavailability, potential toxicity, and drug interactions. As research on D-tetrandrine continues to evolve, it is likely that we will gain a deeper understanding of its mechanisms of action and potential applications, paving the way for the development of novel therapeutic strategies.
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