CN111789846A

CN111789846A - Application of L-securinine and its medicinal salt in preparing antidepressant drug

Info

Publication number: CN111789846A
Application number: CN202010799865.4A
Authority: CN
Inventors: 师蕾; 叶文才; 王英; 吴振龙; 彭颖慧; 陶丽君; 张清华; 肖涵琳
Original assignee: Jinan University
Current assignee: Jinan University; University of Jinan
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2020-10-20

Abstract

The invention discloses application of L-securinine and a medicinal salt thereof in preparing an anti-depression medicament. The antidepressant drug disclosed by the invention is single-component L-securinine and a pharmaceutically acceptable salt thereof or a pharmaceutical composition containing the L-securinine and the pharmaceutically acceptable salt thereof; the medicament or the pharmaceutical composition adopts the dosage forms of tablets, capsules, solutions, granules, powder, pills, sprays, suspensions, injections or instillations. The medicine or the medicine composition and the medicinal salt thereof can be applied to the treatment of acute depression and chronic depression and have the characteristics of obvious curative effect, quick response and small toxic and side effect.

Description

Application of L-securinine and its medicinal salt in preparing antidepressant drug

Technical Field

The invention belongs to the field of medicines, and particularly relates to application of L-securinega suffruticosa alkaloid and pharmaceutically acceptable salts thereof in preparation of anti-depression drugs.

Background

Depression is a common mental disorder characterized primarily by a depressed mood, often accompanied by a suicidal tendency (FerrariA J, et al.PLoS Medicine2013, 10(11): e 1001547). According to the data published by the world health organization, about 3.5 million people worldwide have depression, about 100 million depression patients suicide each year, and about 6100 tens of thousands of depression patients in China. With the development of society and the acceleration of life rhythm, the number of patients is expected to increase continuously, which brings heavy economic burden to society (Phillips MR, et al,Lancet, 2009, 373(9680): 2041-2053). The first-line antidepressant drugs used in clinic at present are mainly selective 5-hydroxytryptamine reuptake inhibitors, such as fluoxetine, paroxetine, sertraline and other drugs, and the basic principle is that the 5-hydroxytryptamine level in the brain of depression patients is considered to be lower based on early researches. However, these drugs have two distinct limitations: 1) the drug effect is slow, and the effect is generally generated after the patient takes the drug for 5 to 7 weeks; 2) the response was low, with only about one third of patients responding to the drug. More notably, in some cases, the drug exerts antidepressant therapeutic effects but no increase in 5-hydroxytryptamine is detected. These evidence suggest that levels of 5-hydroxytryptamine may not be directly linked to levels of depression, nor are they the most effective targets for antidepressant drugs.

Studies have shown that multiple regions of the brain in depression patients develop lesions, the most stable of which are neuronal loss, atrophy, decreased dendritic protein expression, decreased dendritic spines and synaptic numbers in the hippocampal and prefrontal cortex sites (Krishnan Vand nester EJ,Nature, 2008, 455(7215): 894; Kang HJ, et al,Nature Medicine, 2012, 18(9): 1413-1417). In animal models of depression, pathological features of the brain consistent with the patient also appear, such as decreased branching of hippocampal neurons, shorter length, decreased dendritic spines, synaptic atrophy and the like (Duman RS, oral,Nature Medicine, 2016, 22(3): 238). The mTOR molecular signaling pathway is used as an important regulation pathway in neurons and can be adjusted by itselfThe processes of phagocytosis, transcription, translation and the like improve the expression of the neurosynaptic protein so as to promote the synaptic function, and various traditional antidepressants also have certain effect of activating mTOR; therefore, mTOR may be an important target for antidepressants (Ign cio ZM, et al, Br J Clin Pharmacol, 2016, 82(5): 1280-1290). The first antidepressant discovered in recent years, ketamine, which is different from a reuptake inhibitor of 5-hydroxytryptamine, has the advantages of quick response and high response. Ketamine can regulate the function of neural networks and neuronal synapses by inhibiting NMDA receptor function and activating mTOR pathway, but the overdose of ketamine can cause hallucinogenic and addictive properties to patients, and the clinical use is limited. Therefore, the development of a novel antidepressant with high efficiency and low toxicity is urgently needed.

Securinine (securinine) belongs to indolizidine alkaloids, and natural securinine includes levo-securinine and dextro-securinine. L-securinega suffruticosa has been found to antagonize neurotransmitter receptor GABA_AThe action of the receptors to excite central nerves (Beutler JA, et al,Brain Res1985, 3310(1):135-140), and can be used for treating facial paralysis, neurasthenia, lethargy, and poliomyelitis sequela. However, the application of the L-securinega suffruticosa alkaloid in depression has not been reported. The inventor finds that the L-securinine can improve the mTOR pathway level and the synaptic protein level of the brains of depressed mice, has obvious curative effect on the mice with acute depression and chronic depression, and is expected to be developed into a novel medicament for treating depression.

Disclosure of Invention

The invention aims to provide the application of the L-securinega suffruticosa alkaloid or the medicinal salt thereof in preparing the anti-depression medicament.

In order to achieve the purpose, the invention adopts the following technical scheme:

a L-securinine has a chemical structure as shown in formula (1):

。

the preparation method of the L-securinine and the pharmaceutically acceptable salt thereof comprises the following steps:

drying and pulverizing the plant raw material of the securinega suffruticosa, percolating and extracting by using 95% ethanol, and concentrating under reduced pressure to obtain a total extract of the securinega suffruticosa extract; suspending the total extract with water, adding 10% hydrochloric acid water solution to adjust pH to 2-3, extracting with chloroform, adding ammonia water to adjust pH to 9-10, extracting with chloroform, and concentrating chloroform layer under reduced pressure to obtain total alkaloids; purifying the total alkaloids by silica gel column chromatography to obtain an enriched part of L-securinine, and recrystallizing the enriched part to obtain L-securinine crystal.

Slowly adding dilute acid solution into the L-securinine crystal to completely dissolve the L-securinine crystal, cooling in ice water bath, drying under reduced pressure to obtain salt of L-securinine, dissolving with anhydrous ethanol, standing for recrystallization, filtering, and drying to obtain pure product of pharmaceutically acceptable salt of L-securinine.

The pharmaceutically acceptable salts described above include, but are not limited to: inorganic anions such as chloride, bromide, iodide, sulfate, sulfite, nitrate, nitrite, phosphate, and hydrogenphosphate, and the like; organic anions such as acetate, propionate, cinnamate, phenylmethanesulfonate, citrate, lactate, gluconate, and the like.

The L-securinine and its pharmaceutically acceptable salt can be made into various dosage forms, including tablet, pill, lozenge, granule, gel, unguent, solution, suppository, injection, inhalant and spray. These dosage forms can be used for both local or systemic administration and for immediate or sustained release administration. When administered by injection, the compounds can be formulated into solutions, suspensions, and emulsions with water-soluble or lipid-soluble solvents. When administered orally, they can be formulated into a complex with pharmaceutically acceptable excipients using conventional techniques. These excipients can be used to formulate the compounds into a variety of dosage forms acceptable to the patient, such as tablets, pills, capsules, suspensions, gels, and the like.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention provides a new application of L-securinine and a medicinal salt thereof in treating depression. The experimental data show that the L-securinega suffruticosa alkaloid has obvious curative effect on mice with acute depression and chronic depression, has effect after single administration, takes effect quickly and has no influence on the autonomous movement of animals. Therefore, the anti-depression drug prepared from the L-securinine and the pharmaceutically acceptable salt thereof has the characteristics of obvious curative effect, quick response and good safety.

Drawings

FIG. 1: the pharmacokinetics curve of single intraperitoneal administration of the L-securinine for blood inflow and brain inflow is shown in the specification, wherein A is the blood concentration of the L-securinine after different time of intraperitoneal administration, and B is the brain concentration of the L-securinine after different time of intraperitoneal administration.

FIG. 2: securinine levorotatory reduced the level of acute depression in mice in a forced swim model: after intraperitoneal administration of L-securinine for 30min (A) or 90min (B), the result of immobility time in the experiment is forced. The result of 15 mice per group experiment is the mean value + -SEM, and the statistical method is one-way ANOVA; p <0.05, p < 0.01.

FIG. 3: l-securinenine activates AKT-mTOR-S6K, ERK and p38 pathways in mouse brain: (A) performing intraperitoneal injection of L-securinine for 90min, homogenizing forebrain parts (mainly including cerebral cortex and hippocampus), performing Western blot experiment, and detecting response of each signal channel. (B-G) statistics of different signaling pathway protein changes; the result is the mean value + -SEM of 6 groups of samples, and the statistical method is one-way ANOVA; p <0.01, p < 0.001.

FIG. 4: the oral administration of the L-securinine has the following effects of resisting acute depression: statistics of forced swimming immobility time after 3 hours of oral administration of securinega suffruticosa alkali. Results are mean ± SEM for 15 mice per group, one-way ANOVA, p <0.05 as statistical method.

FIG. 5: therapeutic effect of securinine levorotatory on chronic depression model mice: after administration of securinine, mice, a chronic depression model, were tested for carbohydrate preference (a), forced swimming (B), mTOR pathway activation (C), and PSD95 expression (D). It can be seen that a single administration improves carbohydrate bias and increases immobility time in forced swimming; the effect is more obvious after multiple times of administration. For the aspects of mTOR pathway activation and PSD95 expression, the effect of single administration is not obvious, and the effect of multiple administrations is obvious. Results were mean ± SEM for 15 mice per group, statistical methods one-way ANOVA, p <0.01, p <0.001, depression model + DMSO vs normal mice group; # p <0.05, # p <0.01, # p <0.001, depressive model + Securinegine levogyration group vs depressive model + DMSO group; a depression model, a single levorotatory securinine group vs depression model and a multiple levorotatory securinine group.

FIG. 6: the L-securinine does not generate toxic and side effects on the autonomous behavior of the mice: after the administration of the L-securinine for 60min, various indexes of the movement of the mice in an open field are tested: (A) a central zone residence time; (B) peripheral zone dwell time; (C) a center region movement distance; (D) peripheral zone movement distance; (E) a total movement distance; (F) a central region movement speed; (G) peripheral region

The speed of movement; (H) the total speed of movement. All indexes have no statistical difference. Results are mean ± SEM of 15 mice per group, one-way ANOVA is the statistical method.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.

Example 1: separation and purification of L-securinine

Taking 1 kg of dried securinega suffruticosa branches and leaves, grinding, percolating and extracting with 5L of 95% ethanol for 3 times, mixing the extracting solutions, and concentrating under reduced pressure to obtain 80 g of total extract; suspending the total extract with 800 mL of water, adding 50 mL of 10% hydrochloric acid aqueous solution to adjust the pH to 2-3, extracting with chloroform, adding 30 mL of ammonia water into the acid aqueous layer to adjust the pH to 9-10, extracting with chloroform, and concentrating under reduced pressure in the chloroform layer to obtain 0.9 g of total alkaloids of securinega suffruticosa; purifying the total alkaloids by silica gel column chromatography, eluting with chloroform-methanol mixed solvent, mixing the fractions rich in L-securinine, and recrystallizing to obtain L-securinine crystal of about 200 mg.

Example 2: preparation of L-securinega suffruticosa salt

And slowly adding 100 mg of L-securinine crystals (purity is more than 95%), completely dissolving the crystals in 6 mL of 1% hydrochloric acid solution, standing the mixture for 2 hours in an ice water bath, drying the mixture under reduced pressure, dissolving the dried mixture in 3 mL of absolute ethanol, standing the mixture for recrystallization, washing the crystals with methanol, and filtering and drying the washed crystals to obtain the L-securinine hydrochloride (103 mg).

And slowly adding 100 mg of L-securinine crystals (purity is more than 95%), completely dissolving the crystals in 2 mL of 1% sulfuric acid solution, standing the mixture for 2 hours in an ice-water bath, drying the mixture under reduced pressure, dissolving the dried mixture in 3 mL of absolute ethanol, standing the mixture for recrystallization, washing the crystals with methanol, and filtering and drying the crystals to obtain the L-securinine sulfate (108 mg).

And slowly adding 100 mg of L-securinine crystals (with the purity of more than 95 percent), slowly adding 3 mL of 1 percent nitric acid solution to completely dissolve the crystals, standing for 2 hours in ice-water bath, drying under reduced pressure, dissolving the crystals by using 3 mL of absolute ethyl alcohol, standing for recrystallization, washing the crystals by using methanol, filtering and drying to obtain the L-securinine nitrate (110 mg).

Example 3: nerve cell differentiation promoting activity of L-securinine and its salts

The purpose is as follows: investigating the activity of L-securinine and the nitrate, hydrochloride and sulfate thereof for promoting the differentiation of nerve cells

The method comprises the following steps: neuro-2a cells (purchased from American type culture collection cell bank) were recovered, cultured in growth medium (MEM +10% FBS + 100U/mL penicillin and 100. mu.g/mL streptomycin), plated in a 100 mm dish, and cultured in a constant temperature incubator containing 5% CO2 at 37 ℃. And (3) carrying out passage when the cells grow to 60-70%, sucking out the culture solution in a culture dish, adding a proper amount of PBS (phosphate buffer solution), washing, digesting for 45 seconds by using 0.25% trypsin, adding a growth culture medium to stop digestion after the adherent cells are spherical, uniformly mixing, carrying out passage according to a ratio of 1:10, and carrying out passage for one day in three days. When the differentiation of the nerve cell strain is induced, the planting density of the cells is 2 multiplied by 10⁴Each cell/35 mm culture dish or 1X 10⁴One well (12-well plate), cultured in growth medium for 24 hours, then changed to differentiation medium (MEM +0.5% FBS + 100U/mL penicillin and 100. mu.g/mL streptomycin), and treated with addition of L-securinine or several pharmaceutically acceptable salts thereof for 48 hours. With 4% multimerizationFixing cells with formaldehyde/4% sucrose for 20-30 min, and observing differentiation morphology and neurite of nerve cell strain by using beta-tubulin III (marker protein specifically expressed by neurite) antibody immunofluorescence staining method. And (3) automatically scanning and photographing by adopting a high content instrument, and performing statistical analysis by utilizing Cellomics view software. Cells with neurite length greater than twice the soma were defined as nerve cells, and the average length of total neurite per differentiated cell was statistically analyzed.

As a result: l-securinine and its nitrate, hydrochloride and sulfate all had similar activities of promoting nerve cell differentiation (Table 1).

TABLE 1 neural cell differentiation-promoting activity of L-securinine and its salts

^aThe values in the table are neurite length (unit: μm), the results are mean. + -. SEM of three independent experiments, and the statistical method is one-way ANOVA.^bAs a positive control, trans-Retinoic Acid (RA).

Example 4: l-securinine and its medicinal salts for promoting neurosynaptic formation

The purpose is as follows: investigating the neurosynaptic formation promoting activity of L-securinine and nitrate, hydrochloride and sulfate thereof

The method comprises the following steps: collecting hippocampal tissue of fetal rat of Sprague Dawley at 18 days of embryonic stage, digesting with pancreatin to obtain single isolated neuron, and planting on 18 mm glass slide coated with polylysine (Poly-D-Lysine) at density of 0.2 × 10⁵Slide glass, cultured in Neurobasal medium supplemented with 2% B27. The solution was changed every three days (2% B27 in Neurobasal medium) half at a time. DMSO or L-securinine or its several pharmaceutically acceptable salts (10 μ M) was added at the 14 th day of culture, and treated for 48 hours. Fixation was performed with 4% paraformaldehyde for 5 minutes, followed by pre-cooled methanol on ice for 15 minutes. PSD-95 (excitatory postsynaptic nerve)Specifically expressed marker protein) antibody immunofluorescent staining method to evaluate the synapse formation. The number of PSD-95 clusters on the average dendrite length in each group was counted by photographing with a Zeiss Imager A2 fluorescence microscope.

As a result: l-securinine and its nitrate, hydrochloride and sulfate all had similar activity in promoting PSD-95 clustering (Table 2).

TABLE 2L-securinine and its salts promote PSD-95 clustering activity

Example 5: the pharmacokinetic results of the L-securinine after intraperitoneal injection into blood and brain

The purpose is as follows: study on the pharmacokinetic parameters of L-securinine entering blood and brain

The method comprises the following steps:

male C57BL/6J mice 7-8 months old are fasted for 12 hours before the experiment, freely drink water, and are intraperitoneally injected with L-securinine at a dose of 7.5 mg/kg, and the preparation method is shown in example 3. The eyes were bled and the brain tissue was harvested at 10 time points (3 mice per time point) before (0 min) and 1.5, 5, 9, 15, 30, 60, 120, 240, 480 min after administration, respectively. The blood samples were centrifuged (4 ℃, 3000 rpm, 8 min) and the plasma was separated.

Taking 100 mu L of mouse plasma, adding 600 mu L of acetonitrile (IS) solution containing an internal standard compound, vortexing and oscillating for 5 min, centrifuging for 15 min at 4 ℃ and 15000 rpm, taking supernatant, volatilizing by a vacuum concentrator (40 ℃, 4 h), adding 100 mu L of 50% methanol for redissolving, vortexing for 3 min, performing ultrasound for 5 min, vortexing for 1 min, then centrifuging for 15 min at 15000 rpm, and taking supernatant for LC/MS analysis.

After the surface bloodstain of the brain tissue is washed by normal saline, water is sucked out, the brain tissue is precisely weighed, the normal saline is added according to the mass (g) to volume (mL) ratio of 1:2, and the brain tissue is homogenized. Taking 200 mu L of brain homogenate sample, respectively adding 1200 mu L of acetonitrile solution containing an internal standard compound, vortexing for 5 min, centrifuging for 15 min at the temperature of 4 ℃ and the speed of 15000 rpm, taking supernatant, volatilizing by using a vacuum concentrator, re-dissolving by 100 mu L of 50% methanol, processing the supernatant by using the vacuum concentrator, and then carrying out LC/MS analysis.

Chromatographic conditions are as follows: the method comprises the steps of adopting Waters ACQUITY QTOF four-stage rod series time flight mass spectrum to effectively separate the L-securinine and the internal standard substance, setting the column temperature to be 40 ℃, setting the sample chamber temperature to be 5 ℃, and adopting pure water and acetonitrile as a mobile phase, wherein the water contains 0.1% of formic acid. A chromatographic column: waters ACQUITY UPLC BEH C18 column (1.7 μm, 2.1 mm. times.100 mm) reverse phase chromatography column; time: 6 min; sample introduction amount: 5 μ L (specific conditions see Table below).

Mass spectrum conditions: positive ion scanning mode, electrospray ionization source, ion source temperature 60 ℃; ion spray voltage 3000V; scanning range: 100-500 Da, and the ion pair [ M + H + ] of (+) -SE is 218.12. According to the peak areas of plasma and brain collected at each time point after administration of each tested mouse, the plasma or brain concentration at each time point is calculated through a corresponding standard curve of blood or brain of each compound, each main pharmacokinetic parameter is calculated by using a non-atrioventricular model method, and parameters such as half-life and the like are analyzed through WinNonlin version 6.3 (Pharsight, Mountain View, Calif., USA) software.

As a result: securinine levorotatory can rapidly enter blood and brain in prototype, peak time is 9 minutes and 30 minutes respectively, and elimination time is 4 hours (table 3 and figure 1).

TABLE 3 pharmacokinetic results of L-securinine in blood and brain after intraperitoneal injection

Example 6: therapeutic effect of L-securinine on acute depressive episode induced by forced swimming model

The purpose is as follows: evaluation of anti-acute Depression action of L-securinine

The method comprises the following steps:

1) male mice, C57BL/6J (6-7 weeks) were housed in animal rooms with 12 hours bright (8: 00 to 20: 00), 12 hours dark cycle (20: 00 to 8:00 the next day), and relative humidity 60-70% and were freely fed with water. One week after acclimatization (7-8 weeks), the experiment was started.

2) Mice were placed in a behavioural laboratory in advance to acclimatize for more than 1 hour.

3) Single administration by intraperitoneal injection or oral administration: the injection dosage of the L-securinega suffruticosa alkaloid [ (-) -SE ] is 3.75mg/kg or 7.5 mg/kg, and the oral administration dosage is 10 mg/kg and 30 mg/kg. The preparation method of the medicine comprises the following steps: completely dissolving L-securinine in DMSO at concentrations of 37.5 mg/mL, 75 mg/mL, 100 mg/kg and 300 mg/kg respectively, adding 1 volume of DMSO, adding 1 volume of Tween-80, mixing, adding 98 volumes of physiological saline, mixing to obtain solutions at concentrations of 0.375 mg/mL, 0.75 mg/mL, 1 mg/kg and 3 mg/kg respectively, and injecting or orally administering at a volume of 0.1 mL per 10 g body weight. Blanks were given 1% DMSO, 1% Tween-80 and 98% saline as solvent controls. Prepared fresh before each administration. Each group was set with 15 mice. Forced swimming experiments were performed 30min or 90min after dosing.

4) The video recorder was turned on (angle for side shooter) and the mice were placed in a plexiglass jar of 15 cm diameter, 25 cm height, and 13 cm depth of water (now the mice hind paws were not enough to bottom) at 25 + -1 deg.C. The whole course was videotaped for 6 min, and the immobility time of the mice 4 min later indicated the depressed (despair) mood level of the mice. The mice that completed the experiment were wiped dry with paper, anesthetized with ether, and the brains were immediately removed and stored at-80 ℃ for subsequent pathological experiments. The glass jar was cleaned and water changed before the next mouse experiment.

5) The last 4 minutes of immobility time of the mice in the video was analyzed by forcedslim Version 2.0 (Clever Sys Inc.).

As a result: securinine L-securinine showed antidepressant effect after a single intraperitoneal administration for 30min or 90min at a dose of 7.5 mg/kg, and also showed antidepressant effect after a dose of 3.75mg/kg for 90min (FIG. 1). Brain tissues of a depression group and a depression administration group are simultaneously taken for analysis, and the result shows that an mTOR pathway is obviously activated after administration, and the expression of an important functional protein PSD-95 in the nerve synapse is also up-regulated, which indicates that the nerve synapse function is improved (figure 2). In addition, the oral administration showed antidepressant effect at a dose of 30 mg/kg (administration time of 3 hours) (FIG. 3).

Figure 2 shows that levo-securinine reduces the level of acute depression produced by mice in a forced swim model: retention time in forced swimming test after administering L-securinine to abdominal cavity for 30min (A) or 90min (B). The result of 15 mice per group experiment was the mean ± SEM, and the statistical method was one-way ANOVA; p <0.05, p < 0.01.

FIG. 3 shows that L-securinine activates AKT-mTOR-S6K, ERK and p38 pathway in mouse brain, wherein (A) after administration of L-securinine by intraperitoneal injection for 90min, forebrain parts (mainly cortex and hippocampus) are homogenized and then subjected to Western blot experiment to detect response of each signal pathway. (B-G) statistics of different signaling pathway protein changes; the result is the mean value + -SEM of 6 groups of samples, and the statistical method is one-way ANOVA; p <0.01, p < 0.001.

Figure 4 shows the anti-acute depressive effect of oral securinega laevigata base: statistics of forced swimming immobility time after 3 hours of oral administration of L-securinine. Results were mean ± SEM for 15 mice per group, one-way ANOVA, p <0.05 as statistical method.

Example 7: therapeutic action of L-securinine on chronic depression model mice

The purpose is as follows: evaluation of anti-chronic Depression action of L-securinine

The method comprises the following steps:

2) The chronic depression molding method comprises the following steps: mice were sequentially given the stress patterns shown in the following table, with two stress categories per day for 30 days. The mice were weighed every 5 days during molding and tested for depression levels by a sugar water preference test on

days

15 and 30.

Stress mode adopted by chronic depression modeling

3) The mice are divided into a normal control group, a depression model and DMSO solvent single administration group, a depression model and L-securinine single administration group, a depression model and DMSO multiple administration group, a depression model and L-securinine multiple administration group, and 15 mice in each group. The single administration group is administered the next day after the molding is finished, and depression indexes are detected after administration for 90 min; the multi-administration group starts to administer the medicament on the 16 th day of the molding, once a day, lasts for 15 days until the molding is finished; the next day depression indicators were measured. The administration modes are intraperitoneal injection, the administration dosage of the L-securinine is 7.5 mg/kg, and the preparation method is shown in example 6.

4) Evaluation tests of the depression index include: forced swimming experiment, sugar water preference experiment, mTOR pathway and PSD-95 expression level detection.

As a result: both single and multiple dose groups showed antidepressant effects including decreased immobility time in forced swim experiments, increased sugar intake in sugar preference experiments, decreased corticosterone levels in serum, and increased mTOR pathway activation and PSD-95 expression levels (fig. 5).

Figure 5 shows the therapeutic effect of levo-securinine on chronic depression model mice: after administration of securinerine laevigata (l-securinine) to chronic depression model mice, carbohydrate preference (a), forced swimming (B), corticosterone level in serum (C), mTOR pathway activation (D), and PSD95 expression (E) were tested. Results are mean ± SEM, statistical methods one-way ANOVA, <0.01, <0.001, < depression model + DMSO group vs normal mice group; # p <0.05, # p <0.01, # p <0.001, depression model + securinine levogyration group vs depression model + DMSO group; and the group of the L-securinine are respectively selected from a group of a depression model and a single L-securinine and a group of a multiple L-securinine and a multiple L-securinine.

Example 8: the L-securinine does not generate toxic and side effects on the autonomous motor behavior of the mice

The purpose is as follows: evaluation of toxic and side effects of L-securinine

The method comprises the following steps:

c57BL/6J (7-8 weeks) male mice were acclimated in the laboratory at 23-25 deg.C for 1 hour, and then administered with 3.75mg/kg or 7.5 mg/kg L-securinine intraperitoneally, and the drug formulation was as described in example 6. The independent behavior of the mice was evaluated by an Open field experiment (Open field) 30min after a single administration, as follows:

1) open-top experimental box of opaque Polypropylene (Polypropylene) of 40 × 40 × 40 cm in open field, take out mouse from cage, put into box center, the top shoots and begins timing, record 30min with video system;

2) data statistics were performed by analyzing the mouse motion trajectory, velocity, residence time in the central region (area 50%) and peripheral region using TopScan Version 3.0 (Clever Sys Inc.) software.

As a result: after the administration of L-securinine (3.75 mg/kg or 7.5 mg/kg), the movement distance, speed and residence time in the center and the periphery of the mice are not abnormal, which indicates that the two doses have no toxic and side effects on the autonomous motor behaviors of the mice (figure 6).

Fig. 6 shows that the L-securinine does not generate toxic and side effects on the autonomous motor behavior of the mice: after the administration of the L-securinine for 30min, the various indexes of the movement of the mice in an open field are tested: (A) a central zone residence time; (B) peripheral zone dwell time; (C) a center region movement distance; (D) peripheral zone movement distance; (E) a total movement distance; (F) a central region movement speed; (G) peripheral zone movement speed; (H) the total speed of movement. All indexes have no statistical difference. Results are mean ± SEM of 15 mice per group, one-way ANOVA is the statistical method.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. Application of L-securinine and its pharmaceutically acceptable salt in preparing antidepressant is provided.

2. L-securineine and its pharmaceutically acceptable salts according to claim 1, wherein pharmaceutically acceptable salts include hydrochloride, sulfate and nitrate.

3. The use of L-securinega suffruticosa alkaloid and its pharmaceutically acceptable salt in the preparation of antidepressant according to claims 1-2, wherein the antidepressant is L-securinega suffruticosa alkaloid and its pharmaceutically acceptable salt or pharmaceutical composition containing the above components.

4. The use of L-securinenine and its pharmaceutically acceptable salts for the preparation of antidepressant for the treatment of depression of claims 1-3, wherein said antidepressant or pharmaceutical composition can be administered in a pharmaceutically acceptable manner and dosage form.

5. The administration mode and dosage form of the L-securinine and the pharmaceutically acceptable salt thereof or the pharmaceutical composition containing the above components in the preparation of antidepressant drug according to claim 4 are characterized in that the administration mode and dosage form can be realized by tablets, capsules, solutions, granules, powders, pills, sprays, suspensions, injections or instillations and the like.