Introduction/Overview
Naringenin (CAS number: 480-41), as a natural flavanone mainly found in citrus fruits, has attracted much attention in recent years due to its diverse biological activities. Naringin not only exhibits significant anti-inflammatory and antioxidant effects, but has also been proven to have the potential to resist viruses, especially dengue virus (DENV). In addition, the application research of naringin in the prevention and treatment of cardiovascular diseases is becoming increasingly in-depth, involving multiple key molecular targets, reflecting its broad prospects as a natural drug candidate molecule. This article aims to systematically review the chemical structure and physicochemical properties, plant sources and extraction methods, pharmacological activity and mechanism of action, pharmacological evaluation, pharmacokinetic characteristics, and clinical application potential of naringin. The purpose is to provide theoretical basis and research reference for scientific research and drug development in related fields.
Chemical structure and physicochemical properties
Naringin belongs to the class of flavanone compounds, with a molecular formula of C15H12O5 and a molecular weight of 272.2560. Its chemical structure is composed of a typical flavanone skeleton, consisting of two benzene rings (A and B rings) and one oxygen heterocyclic ring (C ring). The specific structure is 5,7,4 '- trihydroxyflavanone. The LogP value of naringin is 2.2375, indicating its moderate lipid solubility, which is beneficial for membrane penetration. The polar surface area (TPSA) is 86.9900, reflecting its moderate molecular polarity and a certain degree of water solubility (0.3040 mg/mL), which has a positive impact on its bioavailability. The low blood-brain barrier permeability of naringin suggests its limited distribution in the central nervous system. The negative result of hERG channel inhibition experiment indicates a low risk of cardiac toxicity. The Ames test score is 0.6, indicating a low risk of genotoxicity and meeting safety requirements.
Plant sources and extraction methods
Naringin is widely present in the fruits, peels, and leaves of citrus plants, with grapefruit (Citrus paradisi), orange (Citrus sinensis), lemon (Citrus limon), and orange (Citrus reticulata) being the main sources. The content of naringin is significantly affected by variety, maturity, and cultivation environment. The traditional extraction method mainly adopts solvent extraction technology, and commonly used solvents include ethanol, methanol, and ethyl acetate. Modern extraction techniques such as ultrasound assisted extraction (UAE), microwave-assisted extraction (MAE), and supercritical fluid extraction (SFE) have improved extraction efficiency and purity, while reducing solvent usage and environmental pollution.
The extraction process usually includes raw material pretreatment (cleaning, drying, crushing), solvent extraction, impurity filtration, concentration, and purification. Purification steps often use column chromatography, reverse phase high-performance liquid chromatography (RP-HPLC), or membrane separation techniques to obtain high-purity naringin. The optimization of extraction process not only affects the yield, but also relates to the biological activity preservation of naringin and the accuracy of subsequent pharmacological research.
Pharmacological activity research
anti-inflammatory effect
Naringin exhibits significant anti-inflammatory activity and can inhibit the expression and release of various pro-inflammatory factors, such as tumor necrosis factor - α (TNF - α), interleukin-6 (IL-6), and nitric oxide synthase (iNOS). Both in vitro cell models and in vivo inflammation models have confirmed that naringin reduces the production of inflammatory mediators by regulating the nuclear factor kappa B (NF - κ B) signaling pathway, thereby alleviating tissue damage and inflammatory response.
Antioxidant effect
Naringin has strong free radical scavenging ability, which can effectively remove superoxide anions, hydroxyl radicals, and reactive oxygen species (ROS) such as hydrogen peroxide. Its antioxidant mechanism mainly includes directly clearing free radicals and upregulating the expression of endogenous antioxidant enzymes (such as superoxide dismutase (SOD) and glutathione peroxidase (GPx)), protecting cells from oxidative stress damage, delaying cell aging and tissue degeneration.
Antiviral activity
Naringin has shown potential inhibitory effects in anti dengue virus (DENV) research. In vitro experiments have shown that naringin can inhibit the replication of DENV, reduce viral load, and alleviate virus mediated cellular lesions. Its antiviral mechanism may involve blocking virus entry into cells, inhibiting virus protein synthesis, and interfering with virus gene expression, providing important clues for the development of new antiviral drugs.
Cardiovascular protective effect
Naringin has multiple protective effects in the prevention and treatment of cardiovascular diseases, including anti atherosclerosis, lowering blood lipids, improving vascular endothelial function and anti myocardial ischemia reperfusion injury. Its mechanism of action involves regulating lipid metabolism, inhibiting inflammatory reactions and oxidative stress, promoting vasodilation, reducing myocardial cell apoptosis, and comprehensively improving cardiovascular system function.
Mechanism of action and molecular targets
The multi-target mechanism of action of naringin is the basis of its multiple pharmacological effects. Research on cardiovascular disease-related targets has revealed the molecular network of action of naringin:
- AMPK(PRKAA1)Naringin activates the AMPK signaling pathway, promotes energy metabolism regulation, enhances lipid oxidation, inhibits fat production, and improves metabolic syndrome related pathological states.
- BCL2 By regulating the expression of anti apoptotic protein BCL2, naringin inhibits myocardial cell apoptosis and protects heart tissue from damage.
- BACE1 Naringin has a regulatory effect on the β - secretase BACE1, indicating its potential value in the cross mechanism of neurodegenerative diseases and cardiovascular diseases.
- TLR4 Naringin inhibits Toll like receptor 4 (TLR4) mediated inflammatory signaling, reduces inflammatory response, and protects vascular endothelium.
- PTPN1 By regulating protein tyrosine phosphatase 1 (PTPN1), naringin improves insulin signaling and indirectly promotes cardiovascular metabolic health.
- ESR2 Naringin binds to estrogen receptor beta (ESR2), exerting estrogen like effects, regulating vasodilation, and anti-inflammatory effects.
- APEX1 Naringin regulates the DNA repair enzyme APEX1, enhancing cellular antioxidant capacity and gene stability.
- SERPINE1 Naringin reduces the level of plasma plasminogen activator SERPINE1 and promotes improvement in blood rheology.
- PRKCA By regulating protein kinase C alpha (PRKCA), naringin affects myocardial cell signaling and function.
- AKR1B1 Naringin inhibits aldose reductase AKR1B1 and reduces the risk of cardiovascular complications associated with diabetes.
The synergistic regulation of these targets constitutes a multidimensional pharmacological network of naringin, laying a solid foundation for its potential as a therapeutic candidate molecule for cardiovascular diseases and related metabolic disorders.
Evaluation of drug properties and pharmacokinetics
The pharmacological evaluation of naringin shows that it has good drug compatibility. The molecular weight is moderate, and the LogP value indicates good membrane permeability. The TPSA is moderate, which is beneficial for oral absorption. Although its water solubility is not high, its bioavailability can be improved through formulation technology. Naringin does not inhibit hERG channels, reducing the risk of cardiac toxicity. Ames test results show that its genotoxicity is low and its safety is good.
Pharmacokinetic studies have shown that naringin is rapidly absorbed after oral administration, but its bioavailability is limited by first pass metabolism and low water solubility. Naringin is mainly metabolized by the liver, generating various glucuronic acid complexes and sulfate complexes, and excreted mainly through bile and urine. Its blood-brain barrier permeability is low, which limits the potential application of the central nervous system. The half-life of naringin is moderate and suitable for daily administration.
In response to its pharmacokinetic limitations, researchers have attempted to enhance the stability, bioavailability, and targeting of naringin through novel formulation technologies such as nanocarriers, liposomes, and solid dispersions, providing technical support for clinical applications.
Clinical application prospects and prospects
Naringin, with its multi-target and multi mechanism pharmacological properties, has shown broad application prospects in the field of cardiovascular disease prevention and treatment. Its anti-inflammatory, antioxidant and metabolic regulating effects provide potential therapeutic strategies for atherosclerosis, hypertension, diabetes, myocardial ischemia and other cardiovascular pathological conditions. In addition, the antiviral activity of naringin, especially its inhibition of dengue virus, has opened up new directions for the development of antiviral drugs.
Although the research on the clinical application of naringin is still in its preliminary stage, some preclinical and early clinical trials have verified its safety and effectiveness. In the future, with the advancement of formulation technology and pharmacokinetic optimization, naringin is expected to become an important component of natural medicine or adjuvant therapy drugs.
In addition, the potential role of naringin in neurodegenerative diseases, metabolic syndrome, and tumors also deserves further in-depth research. The application of multi omics techniques and systems pharmacology will help reveal its complex network of action and precise targets, promoting the clinical translation of naringin.
Conclusion
As a typical citrus flavanone, naringin has become a hot topic in natural product pharmacology research due to its excellent pharmacological activity and safety. Its multiple mechanisms of action in anti-inflammatory, antioxidant, antiviral, and cardiovascular protection provide rich scientific basis for the development of new natural medicines. In the future, with the advancement of modern medicinal chemistry, pharmacokinetics, and formulation technology, naringin is expected to play a greater role in clinical treatment and benefit a large number of patients. Continued in-depth basic and clinical research will lay a solid foundation for the drug development and application of naringin, promoting it to become an important member of the natural medicine field.