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Pain is one of the most serious problems plaguing human health today.Drug therapy is one of the main ways to treat pain in clinic.The analgesic drugs commonly used in clinical treatment of pain are often accompanied by many side effects,the analgesic effect is still not ideal.Salvia miltiorrhiza is a traditional medici-nal material with the same origin as food and medicine.It has the functions of promoting blood circulation and removing blood stasis,relieving pain through menstrual circulation,and contains many effective ingredients such as tanshinone and salvianolic acid.Tanshinone is a kind of rosin diterpenoid compound,which mainly consists of o-quinone type and p-quinone type parent nucleus,and tanshinone Ⅱ A is the representative compound.The pharmacological mechanism of tanshinone ⅡA in labor pain mainly includes:① Regulate inflammatory factors.Inflammatory cytokines played an important role in the occurrence and progression of pain.It was found that the analgesic effect of tanshinone ⅡA was related to the anti-inflammatory effect.Tanshinone ⅡA showed anti-injuri-ous activity in various pain models,such as bone cancer pain and sciatic nerve ligation,and related studies found that tanshinone ⅡA could inhibit the expression of inflammatory factors TNF-α,IL-1β and IL-6 in the spinal cord of model rats.In the spinal nerve ligation model,tanshinone ⅡA also promoted the release of anti-inflam-matory cytokine IL-10 in the spinal cord of rats.② Regu-late signal pathways related to regulating spinal cord oxi-dation and apoptosis.Apoptosis and oxidation played an important role in the process of pain.When nerve injury was caused by stimulation,oxidative stress and apopto-sis of nerve cells were involved in the mechanism of hyperalgesia.Tanshinone ⅡA sodium sulfonate could relieve pain by regulating apoptosis-related pathways.In neuralgia model,tanshinone ⅡA could reduce the apop-tosis of spinal cord neurons by inhibiting oxidative stress response in rat spinal cord tissue.In addition,tanshinone ⅡA also decreased the expression of pro-apoptotic protein in spinal dorsal horn of CCI rats.They included caspase-3,Bcl-2,Bax protein,and enhancer binding protein homologous protein,Increased the expres-sion of anti-apoptosis protein Bcl-2.③ Inhibit the activa-tion of spinal cord glial cells.tanshinone ⅡA could exert its labor pain effect by inhibiting the activation of astro-cytes,including inhibiting the expression of chemo-therapy-induced neuralgia,inflammatory pain and inflam-matory cytokines IL-6,IL-1β and TNF-α,and inhibiting the activation of inflammatory signaling pathways related to astrocyte activation.Such as NF-κB signaling path-way,c-Jun N-terminal kinase signaling pathway,etc.In addition,tanshinone ⅡA also inhibited the activation of microglia by inhibiting the expression of CX3CR1 receptor on the surface of microglia and inhibiting the phosphoryla-tion of ERK,JNK and p38 signaling pathways.④ Decr-ease the expression of glutamate receptors in spinal cord.NMDA is an ionic glutamate receptor in the central nervous system,and its subunit NR2B is closely related to pain.The overexpression of NR2B in spinal cord could lead to the decrease of pain threshold,which was an important mechanism of pain generation.The mechani-cal threshold and thermal threshold of CCI rats were increased by tanshinone ⅡA,and the expression of spi-nal dorsal horn 2B subunit was significantly decreased after tanshinone ⅡA treatment in CCI rats.Therefore,it was concluded that the analgesic effect of tanshinone ⅡA on CCI model may be related to the decreased expres-sion of NR2B in spinal dorsal horn.In conclusion,tanshi-none ⅡA can effectively play the role of labor pain,and has great potential for development in the field of medi-cine and health products.
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Areca nut is the dried and mature seed of Areca catechu L.in the palm family,which is a medicinal and food resource.It tastes bitter,spicy and warm.It has the functions of killing insects,eliminating accumulation,activating qi and nourishing water.It contains alkaloids,polyphenols,polysaccharides,fatty acids,amino acids,flavonoids,triterpenes and steroids and other chemical components.It has a certain protective effect on the ner-vous system,and mainly includes:① Arecoline con-tained in areca nut can stimulate the sympathetic nerve and simultaneously stimulate M receptor and N receptor,which can be used for the treatment of Alzheimer's dis-ease.② Antidepressant effect.Arecoline can easily pass through the blood-brain barrier and stimulate nerve cell receptors,thus promoting the body's excitement.Total phenols increase the content of monoamine transmitters in the brain by decreasing the content of monoamine oxi-dase,thus exerting therapeutic effect on depression.③ Antioxidant effect.Polyphenols and flavonoids can reduce oxidative damage of nervous system,and their antioxidant capacity is related to their content.④ Anti-inflammatory effect.Areca polysaccharides can exert anti-inflammatory activity by inhibiting the production of NO in macrophages induced by lipopolysaccharide.⑤Improved digestion.Areca nut water extract has a pro-moting effect on gastrointestinal motility,which is not only related to M choline receptor,but also probably related to α-adrenalin receptor.⑥Other effects.Such as anti-throm-bosis,anti-atherosclerosis,hypoglycemia,blood lipid reg-ulation,anti-tumor,anti-allergy,bacteriostasis,etc.This review summarized the chemical composition and phar-macological action of Areca catechu in recent years.It was found that the mechanism of action of Areca cate-chu L.is still unclear and further research is needed to provide basis for scientific utilization of Areca catechu.
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Acorus tatarinowii is the dried rhizome of the Araceae plant Acorus tatarinowii Schott.Acorus tata-rinowii was first recorded in Shennong's Classic of Mate-ria Medica.It was used for the treatment of epilepsy,amnesia,insomnia,tinnitus,deafness,silent diarrhea,and other diseases.Alzheimer's disease(AD),also known as senile dementia,is a degenerative disease of the central nervous system.It is mainly manifested as neuropsychiatric symptoms such as progressive memory impairment,cognitive dysfunction,personality changes and language disorders.Acorus tatarinowii mainly con-tains phenylpropylene,lignans,alkaloids,sugars,organic acids and amino acids,among which volatile compo-nents such as β-asarone are the main active compo-nents.The main mechanism of action of Acorus tatari-nowii in the prevention and treatment of AD is as follows:① Improve memory ability.Increasing the expression of brain-derived neurotrophic factor(BDNF),extracellular signal-regulated kinase(ERK)and adenosine cyclic phosphate response element binding protein(CREB)can improve cognitive dysfunction.Studies have shown that Acorus tatarinowii can increase the expression of BDNF,ERK,CREB and tyrosine receptor kinase B in the hippo-campus of mice to varying degrees.It can significantly improve the memory ability of memory-impaired mice,so as to achieve the purpose of prevention and treatment of AD.② Anti-oxidative stress.Studies have shown that Acorus tatarinowii can reduce the production of malondi-aldehyde in skeletal muscle,increase superoxide dis-mutase activity and total antioxidant capacity,and repair the balance of oxidative stress.③ Acetylcholinesterase inhibition.The loss of consciousness caused by deficiency of kidney essence in AD patients is related to the patho-logical changes of the cholinergic nervous system.The results showed that Acorus tatarinowii could significantly increase the contents of glutamate and acetylcholine in the cerebral cortex of AD model mice,and decrease the activity of acetylcholinesterase,to achieve the anti-AD effect.④ Anti-inflammatory and neuroprotective effects.The damage of neurons in the brain of AD patients is related to the excessive inflammatory immune response of nerve cells including microglia and astrocytes.The results showed that Acorus tatarinowii can inhibit the autophagy of microglia in rats with cerebral hemorrhage,and has neuroprotective effect,to achieve the effect of anti-AD.In this study,the effects of Acorus tatarinowii on AD were reviewed to further clarify its pharmacological ef-fects,and to provide a basis for clinical application and research.
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Parkinson's disease(PD)is a degenera-tive disease of the central nervous system characterized by the loss of dopamine(DA)neurons in the dense sub-stantia nigra and the depletion of DA neurons.Clinically,the treatment of PD is mainly supplementing dopamine deficiency or using DA receptor agonists,but these drugs can only alleviate the symptoms of PD patients,but cannot prevent neuronal loss and delay disease progres-sion.Natural bioactive polysaccharides have the advan-tages of multi-target,low toxicity and synergistic effect,and have great potential in the prevention and treatment of PD.Numerous studies have shown that polysaccha-rides can be involved in neuronal protection and preven-tion of neurodegenerative diseases through mechanisms such as oxidative stress,reducing neuroinflammation,and inhibiting anti-apoptosis.①Anti-oxidative stress.Oxi-dative stress is caused by increased reactive oxygen spe-cies(ROS)products and weakened antioxidant capacity,resulting in destruction of lipids,proteins,and DNA.Oxi-dative stress-induced mitochondrial dysfunction is thought to be an important cause of DA neuronal loss in PD mice.Polysaccharides reduce the damage of DA neurons in the substantia nigra by increasing the activity of antioxidant enzymes and inhibiting the formation of reactive oxygen species.② Reduce neuroinflammation.Neuroinflamma-tory response is the main causative factor of neurodegener-ation,microglia are innate immune cells present in the central nervous system,and their continuous activation is a key link in central nervous system neuroinflammation.Polysaccharides can regulate the expression of inflamma-somes,reduce the levels of pro-inflammatory cytokines and cytotoxic factors,inhibit the excessive activation of microglia,reduce PD neuroinflammatory damage,and then exert neuroprotective effects.③ Inhibiting apopto-sis.Apoptosis(APO)is the process of cell death caused by the activation of cell death procedures by various fac-tors.During the pathogenesis of PD,due to changes in the internal and external environment of DA neurons,some apoptosis-related genes cause DA neuronal death by regulating cell death signaling pathways.Polysaccha-rides can reduce the Bax/Bcl2 ratio,weaken the activa-tion of caspase-related proteins,improve the viability of PC12 cells,reduce apoptosis,and protect the activity of dopamine neurons.In summary,traditional Chinese med-icine polysaccharides can effectively treat and improve PD,and its mechanism of action involves anti-oxidative stress,reducing neuroinflammation and apoptosis.There-fore,traditional Chinese medicine polysaccharides have great development potential in the field of medicine and health.
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Alzheimer's disease(AD)is a neurode-generative disease with insidious onset and progressive development.In recent years,the prevalence of AD has shown a linear upward trend.At present,its pathogene-sis is not clear.Lycium barbarum polysaccharide(LBP)is one of the main effective components extracted from the dried ripe fruit of Lycium barbarum L.,a solanaceae plant.It has many pharmacological effects such as anti-aging,anti-oxidation,anti-fibrosis,anti-inflammation,neu-roprotection and immunomodulation.LBP has been widely studied in the field of prevention and treatment of AD because of its good anti-aging and neuroprotective effects.Its prevention and treatment mechanism mainly includes the following points:① Regulating the apoptosis of nerve cells.Studies have shown that the signal pathway com-posed of phosphatidylinositol 3-kinase/protein kinase B(PI3K/Akt)participates in a series of processes such as the growth,proliferation and apoptosis of neurons and plays an important regulatory role.LBP can reduce the number of cell apoptosis,increase the expression levels of autophagy protein Beclin1 and microtubule-associated protein 1 light chain 3Ⅱ(LC3Ⅱ),and decrease the expres-sion levels of p-Akt and phosphorylated mammalian target protein of rapamycin(p-mTOR),which indicates that Lycium barbarum polysaccharide can prevent and treat AD by inhibiting PI3K/Akt/mTOR pathway and improv-ing the autophagy level of cells.②Inhibition of amyloid β-protein(Aβ)production.Aβ is the main component of senile plaque,which is regarded as the main biomarker of AD.It is found that the neurotoxicity of Aβ plays a role by increas-ing the influx of Ca2+ mediated by N-methyl-D-aspartate receptor in the process of signal transduction in the brain,and then generating reactive oxygen species(ROS)and apoptosis signals.LBP can promote autophagy of HT22 cells by inhibiting PI3K/Akt pathway,which has a protec-tive effect on Aβ-induced toxicity.③ Inhibit the produc-tion of inflammatory cytokines.In the pathogenesis of AD,microglia are activated when they feel pathological accumulation of Aβ,and then cell surface immune and adhesion molecules such as cluster of differentiation 45(CD45),CD40,CD36 and integrins are activated,thereby recruiting Src family kinases and activating MAPK path-way,leading to over-expression of proinflammatory fac-tors.A large number of cytokines and chemokines are produced,which may lead to synapse damage and loss.For example tumor necrosis factor-α(TNF-α)can induce neuronal apoptosis and injury.The production of interleu-kin,and other cytokines and chemokines may also lead to microglia activation,astrocyte proliferation,and further secretion of proinflammatory factors and amyloid deposi-tion,thus making the neuroinflammatory cascade perma-nent.LBP can down-regulate the expression of TNF-α and IL-1β genes,reduce the level of intracellular ROS,and improve the learning and memory ability of AD patients.In this paper,the mechanism of Lycium barbarum polysaccharide in preventing and treating AD is reviewed,in order to provide basis for drug development and clini-cal application.
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Traditional Chinese herb compound is a prescription formulated according to the theory of Chinese medicine, and it is a commonly used method of Chinese medicine. As one of the main active ingredients, the extraction methods of polysaccharides from traditional Chinese herb compound include solvent extraction, ultrasonic assisted extraction, microwave assisted extraction and microbial fermentation extraction. The traditional Chinese herb compound polysaccharide has antitumor, immunoregulatory, intestinal mucosa repair, hypoglycemic, antiviral, antioxidant and other pharmacological activities. In this paper, the extraction methods of polysaccharides from traditional Chinese herb compound and its pharmacological activities were summarized, so as to provide scientific evidence for a better development and utilization of traditional Chinese herb compound polysaccharide.
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OBJECTIVE： To establish a method for determining the content of tetracaine hydrochloride （TCH） ethosomes， and to optimize the preparation technology. METHODS： The content of TCH was determined by HPLC. TCH ethosomes were prepared with injection-ultrasonic method. Using drug-loading amount， egg lecithin concentration and ethanol volume fraction as factor， encapsulation efficiency as index， central composite design-response surface methodology was used to optimize the prescription based on the single factor test. The prepared ethosomes were characterized and the stability was evaluated. RESULTS： The linear range of TCH was 10-100 μg/mL （r＝0.999 5）； the limit of quantification was 0.045 μg/mL， and detection limit was 0.021 μg/mL. RSD of precision， stability and repeatability tests were less than 2％. The recoveries ranged 97.80％-103.20％ （RSD＝0.36％， n＝9）. The optimal preparation technology included that the adding amount of TCH control was 1 mg； the concentration of egg lecithin was 7 mg/mL， and ethanol volume fraction was 33％. Under this technology， the average encapsulation efficiency was 64.50％ （n＝3）， the relative error of which from the predicted value （64.92％） was 0.64％. TCH ethosome was a clear blue liquid with a blue opalescence. Its appearance was spherical， its shape was round， smooth， uniform in size； the average particle size was （80.33±2.24） nm， and the average Zeta potential was （－22.6±1.33） mV. TCH ethosome was stable during 10 days under 4 ℃， sealed and protected from light. CONCLUSIONS： The optimal preparation process is stable and feasible. Established method is simple and rapid.
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Objective:On the basis of synthetic antigens on minoxidil ,we prepared its polyclonal antibody and established a ELISA method to detect minoxidil .Methods:We synthesized minoxidil artificial antigen with glutaraldehyde and identified by UV scan -ning.We had established a detection of minoxidil competition ELISA .Results: The UV scan showed that the minoxidil successfully coupled to a carrier protein.The conjugate of minoxidil-BSA was used to immunize BALB/c mice.And the produced antiserum showed high titer of 1:12 800 in the indirect ELISA.Its ELISA curve equation:y=-0.082 3 x+0.938 ( R2 =0.9811 ) , minoxidil mass concentration and the absorbance in 0.001-10 μg/ml showed a good linearity .Conclusion: This method has been successfully preparing minoxidil artificial antigen and polyclonal antibodies and established ELISA detection method for minoxidil ,which provides a basis for the practical application of minoxidil immunoassay method .
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Aim To investigate the protective effects of chrysophanol( Chry) on immune function of lead poi-soning mice. Methods The lead poisoning model was established by peritoneally injecting mice with 7 mg · kg-1 lead acetate every day for 8 days. After Chry was ip injected for 14 days,spleen and thymus index, the white blood cell count, T, B lymphocyte proliferation, phagocytic function of macrophages, natural killer cell ( NK cell) activity were detected. The concentrations of IFN-γ,IL-2,IL-4,IL-10 in the lead poisoning mice ser-um were determined by enzyme-linked immunosorbent assay ( ELISA) . Results Intraperitoneal injection of 7 mg · kg-1 lead acetate for 8 consecutive days could cause an immunity decline in lead poisoning mice, Chry could significantly improve the immunity of lead poisoning mice. Compared with model group, Chry sig-nificantly improved growth rate, viscera index and white blood cell count of lead poisoning mice at differ-ent extent ( P0. 05 ) , only IL-10 was significantly increased in Chry ( 0 . 1 mg · kg-1 ) treatment group ( P<0 . 05 ) . Conclusion Chry can significantly improve the im-mune function of lead poisoning mice.
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AIM:To establish a method for determining saikosaponin A,paeoniflorin,hesperidin and ferulic acid in Chaihu Shugan Powder(Pericarpium Citri Reticulatae,Radix Bupleuri,Rhizoma Chuanxiong,Fructus Aurantii,Radix Paeoniae alba,etc.).METHODS:The chromatographic saparation was performed on a Hypersil C_(18) column(250 mm×4.6 mm,5 μm).The mobile phase was acetonitril-water(43:57)for saikosaponin A,and the mobile phase for rest components was acetonitrile-0.5% acetic acid(40:60).All of flow rates were 0.8 mL/min and column temperature maintained at 30℃.The detection wavelength was set at 200-400 nm.RESULTS:The four constituents were separated within 15 min.The linear ranges of saikosaponin A,paeoniflorin,hesperidin and ferulic acid were 38.5-166.7 μg/mL(r = 0.999 6),15.9～254.5 μg/mL(r = 0.999 9),22.1-353 μg/mL(r =0.999 3),6.30-201.5 μg/mL(r =0.999 9),respectively.The average recoveries were 97.57%,97.40%,98.86%,96.37%,respectively.The RSD were 2.1%,1.1%,0.70%,1.3%,respectively.CONCLUSION:The method is rapid,simple and accurate,and can be used for quality control of Chaihu Shugan Powder.
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AIM To study the protective effects and mechanism of chrysophanol on learning and memory impairment of mice with acute senile model induced by AlCl 3. METHODS After sc of AlCl 3 60 mg?kg -1 for 7 d and ip chrysophanol 10,1,0 1 mg?kg -1 for 15 d, using step-through test and step-down test, the effect of chrysophanol on learning and memory was observed and the superoxide dismutase (SOD) activities in cerebrum and glutathione peroxidase (GSH-px)activities in plasma and cerebrum were measured. RESULTS Chrysophanol 10,1,0 1 mg?kg -1 significantly improved me mory impairment induced by AlCl 3 and enhanced the activities of GSH- px and SOD. CONCLUSION Chrysophanol showed protective effect on br ain memory impairment of mice in acute senile model induced by AlCl 3, perhaps the mechanism is involved in enhancing the activities of GSH-px and SOD, cleari ng away the oxygen radicals, protecting the brain neurons from the harm of lipop eroxide.
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Objective To optimize the preparation technology of chrysophanol loaded polybutylcyanoacrylate nanocapsules by interfacial polymerization,sieve the optimal technology conditions of preparation,and study its quality. Methods Based on the single factor experiment,the formulation was optimized by L9(34) orthogonal design with entrapment efficiency as reference index. The factors including agitating speed,pH value of aqueous phase,amount of ?-butylcyanoacrylate (BCA) and of ethyl acetate were screened. At last,its shape,particle size,the encapsulation efficiency,and the drug loading were investigated as its quality inspection. Results When the ammunt of chrysophanol was 5 mg,the optimum preparation conditions were established as follows:the agitating speed was 800 r/min,the pH value of aqueous phase was 2,the amount of ?-BCA was 13 ?L and ethyl acetate was 0.6 mL. Under this optimum condition,the mean entrapment ratio was 82.19%,and the mean drug loading was 21.48%,the mean diameter of the nanocapsule was 246 nm. The particle size was well-distributed showed by electron microscope pictures. Conclusion The prepared chrysophanol loaded polybutylcy-anoacrylate nanocapsules has small size,high encapsulation efficiency,and drug loading. The preparation technique established in this study is stable and feasible. It also can be used for iv injection.
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AIM:To establish a method for determining saikosaponin A,paeoniflorin,hesperidin and ferulic acid in Chaihu Shugan Powder(Pericarpium Citri Reticulatae,Radix Bupleuri,Rhizoma Chuanxiong,Fructus Aurantii,Radix Paeoniae alba,etc.).METHODS:The chromatographic saparation was performed on a Hypersil C18 column(250 mm?4.6 mm,5 ?m).The mobile phase was acetonitril-water(43:57) for saikosaponin A,and the mobile phase for rest components was acetonitrile -0.5% acetic acid(40:60).All of flow rates were 0.8 mL/min and column temperature maintained at 30 ℃.The detection wavelength was set at 200-400 nm.RESULTS:The four constituents were separated within 15 min.The linear ranges of saikosaponin A,paeoniflorin,hesperidin and ferulic acid were 38.5-166.7 ?g/mL(r=0.999 6),15.9～254.5 ?g/mL(r=0.999 9),22.1-353 ?g/mL(r =0.999 3),6.30-201.5 ?g/mL(r=0.999 9),respectively.The average recoveries were 97.57%,97.40%,98.86%,96.37%,respectively.The RSD were 2.1%,1.1%,0.70%,1.3%,respectively.CONCLUSION:The method is rapid,simple and accurate,and can be used for quality control of Chaihu Shugan Powder.
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AIM:To study the electrophysiological effects of resveratrol from grape and polygonum cuspidate on autorhythmicity organization in left ventricular outflow tract of guinea pig and its intracellular mechanism.METHODS:In choosing guinea pig weighing 250~300 g,the action potential,including its MDP(maximal diastolic potential),APA(amplitude of AP),Vmax(maximal rate of zero phase depolarization),VDD[velocity of diastolic(phase 4)depolarization],RPF(rate of pacemaker firing)and APD_ 50,APD_ 90(the duration of 50% and 90% repolarization of action potential),were observed and recorded by means of the intracellular microelectrode technique.RESULTS:(1)Resveratrol could reduce the electric activity of left ventricular outflow tract.Resveratrol(30、60、120 ?mol/L)not only significantly decreased APA and Vmax,but also decreased VDD and RPF respectivily(P
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liver after i.v. administration. The distribution of osthole in blood and kidney were siginificantly higher( P
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OBJECTIVE:To study the best preparation technology of Gross Saponins tribullu terrestris droping pill. METHODS: The ratio of Gross Spongines Tribullu terrestris to matrix, dripping temperature, dripping distance and dripping speed were investigated by preliminary test and orthogonal test with sphericity, the variation coefficient of weight of pill,time limit of dissolution and appearance of the dropping pill were taken as scoring indexes. Meanwhile, the technical conditions were optimized by orthogonal test on the basis of preliminary test.RESULTS: The optimal technical conditions were as follows: the ratio of matrix to Gross Saponins Tribullu terrestris was 5∶1;the dripping temperature was 85 ℃;the dripping speed was 8 d?min-1 and the dripping distance was 12 cm.CONCLUSION:The technology is simple, feasible and the evaluation indexes were reliable and reasonable and it can meet the requirement for dripping pill specified in China Pharmacopeia (2005 Edition).
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Aim To study the effect of blocking adenosine A_1 receptors on BDNF protein expression and the endoplasmic reticulum(ER) content of the rat hippocampus.Methods The effect of DPCPX on BDNF protein expression in granular cells of the rat hippocampus was observed using immunohistochemical method,and the effect of DPCPX on ER in neurons of the rat hippocampus was observed with transmission electron microscope.Results DPCPX(0.1 mg?kg~(-1),ip,15 d) significantly increased the number of BDNF positive cells in hippocampus granular cells.DPCPX(0.5 mg?kg~(-1),ip,15 d) significantly increased both the levels of BDNF protein and the number of BDNF positive cells in hippocampus granular cells(P
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In step-down tests in mice,the effects of L -proline 0.1 - 100?g ? mouse-1 icv on memory acquisition were not observed, but L -proline0. l~10?g ? mouse-1 icv could significantly improve the anisodine- induced impairments of memory acquisition. This effect of L-proline 1?g ? mouse-1 icv could not be antagonized with D-2-amino-5-phosphonovaleric acid(APS), the N-methyl-D-aspartate (NMDA) receptor antagonist. L-proline 1?g ? mouse-1 icv could also improve memory acquisition impairment induced by high GABA level in brain. This results suggested that L - proline may improve the memory as the modulator or possibly through GABA.
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Aim To observe the effects of chrysophanol on memory impairment and synaptic transmission in the dentate gyrus of hippocampus in AD rats induced by ?-amyloid peptide(A?25-35).Methods AD rat model was established by injection of A?25-35 into cerebral ventricles with cerebral three-dimensional positioning.Chrysophanol of different doses(0.350,0.070 and 0.014 mg?kg-1 ip) were administered continuously.Through the methods of morris water maze test and electrophysiological test,the effects of chrysophanol on memory impairment and long-term potentiation(LTP) induced by high-frequency stimulation(HFS) in AD rats were observed.Results Chrysophanol(0.350,0.070,0.014 mg?kg-1,ip) does-dependently shortened the time of seeking platform and significantly improved the LTP induced by HFS in the DG of hippocampus in AD rats.Conclusion Chrysophanol can improve memory impairment and possess enhancement property on the LTP induced by HFS in AD rats induced by A?25-35.