CN114099498A - Application of 3-aryl benzofuran derivative EIE-2 in preparation of drugs for treating chronic obstructive pulmonary disease - Google Patents

Abstract

The invention belongs to the field of biological medicine, and discloses application of a 3-aryl benzofuran derivative EIE-2 shown as a formula (I) in preparation of a medicine for treating and/or preventing chronic obstructive pulmonary diseases. The 3-aryl benzofuran derivative EIE-2 disclosed by the invention is simple in preparation method, has obvious anti-inflammatory activity, has an obvious treatment effect on chronic obstructive pulmonary diseases, has an improvement effect on lung tissue inflammation pathological changes of COPD model mice, and can improve various indexes of COPD airway inflammation: the composition can obviously inhibit the total number of leucocytes, neutrophils and macrophages in BALF, obviously reduce the generation levels of inflammatory factors TNF-alpha, IL-17A, IFN-gamma and the like in BALF, can be applied to the clinical treatment of chronic obstructive pulmonary diseases in the form of monomers or medicinal compositions, and has potential application value in the treatment of chronic obstructive pulmonary diseases and immune related diseases.

Description

Application of 3-aryl benzofuran derivative EIE-2 in preparation of drugs for treating chronic obstructive pulmonary disease

Technical Field

The invention relates to the field of biomedicine, in particular to a 3-aryl benzofuran derivative EIE-2 or a pharmaceutically acceptable salt thereof, a medicinal composition containing the derivative or the pharmaceutically acceptable salt thereof, and application of the derivative or the pharmaceutically acceptable salt thereof in preparation of a medicament for preventing and/or treating chronic obstructive pulmonary disease.

Background

Chronic Obstructive Pulmonary Disease (COPD) is a progressive respiratory disease characterized by incomplete reversible airflow limitation, and has the characteristics of high morbidity, disability rate and mortality, the morbidity of the whole world over 40 years old is up to 9% -10%, and the COPD is still in a trend of increasing year by year and seriously harms the human health of the whole world.

COPD airflow limitation is associated with an abnormal chronic inflammatory response of the airways and lungs to toxic particles or gases. Chronic airway inflammation is an important feature of COPD, and studies have shown that airway inflammation is positively correlated with the degree of airflow limitation in COPD, the pathological course of which is consistently accompanied by persistent chronic airway inflammation. The inflammation is typically expressed by inflammatory reaction of airway epithelial cells, neutrophils, eosinophils, macrophages, lymphocytes and other cells, and inflammatory factors cause local vasodilation, capillary permeability increase, leukocyte infiltration and generate inflammatory mediators such as leukotriene, cytokines and the like; the interaction between inflammatory mediators, between inflammatory mediators and cells, and between inflammatory cells exacerbates tissue and cell damage, exacerbates the inflammatory response, and perpetuates the inflammatory response. Therefore, control of airway inflammation is one of the essential tools for clinical treatment of COPD; however, to date, there is no ideal drug for the treatment of COPD airway inflammation. Inhalation therapy with corticoid anti-inflammatory drugs is currently the clinically consistent recommended regimen for airway inflammation treatment in COPD, however, studies have found that there is resistance to corticosteroid inhalation for airway inflammation treatment, and no significant improvement in the condition of about 70% to 80% of patients who inhale corticoid therapy is seen. The long-term use of the corticoids has more problems, such as obviously increasing the risk of adverse reactions such as infectious pneumonia. Moreover, the clinically applied non-steroidal anti-inflammatory drugs also have the problem of causing adverse reactions such as heart disease or systemic coagulopathy. Therefore, the search for safer and more effective anti-airway inflammation drugs remains an important task for current COPD inflammation therapy.

Amurensin H (7, 8-dehydrograpevine pentalin) is resveratrol dimer separated from root of Vitis amurensis (Vitis amurensis), and has good in vivo and in vitro anti-inflammatory activity and low toxicity. The invention provides a 3-aryl benzofuran derivative EIE-2 with a new structure, which is obtained by taking Amurensin H as a lead compound through a series of structural modification and optimization, and the structure of the derivative EIE-2 is shown as a formula (I). Pharmacological experiments show that the compound has obvious effect of resisting chronic obstructive pulmonary disease. The application of the compound in the aspect of treating and/or preventing chronic obstructive pulmonary disease is not reported at present. The patent discloses for the first time the use of the compounds in the treatment and/or prevention of chronic obstructive pulmonary disease.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides application of a 3-aryl benzofuran derivative EIE-2 or a pharmaceutical composition thereof in preparation of a medicine for preventing, treating or adjunctively treating chronic obstructive pulmonary disease.

In order to realize the technical problem of the invention, the invention provides the following technical scheme:

the invention takes Amurensin H as a lead compound, synthesizes a 3-aryl benzofuran derivative EIE-2 by a structural modification method, and researches the application of the compound in the aspect of treating chronic obstructive pulmonary disease.

The first aspect of the technical scheme of the invention provides an application of a 3-aryl benzofuran derivative EIE-2 shown as a formula (I) and a pharmaceutically acceptable salt thereof in preparation of a medicament for treating and/or preventing chronic obstructive pulmonary diseases.

In order to accomplish the objects of the present invention, the present invention relates to the use of the 3-arylbenzofuran derivative EIE-2 and its pharmaceutically acceptable salts, and pharmaceutical compositions thereof in chronic obstructive pulmonary disease and other immune-related diseases.

The main risk factor for chronic obstructive pulmonary disease is smoking, and a COPD model of a simulated mouse is induced by LPS + cigarette. The EIE-2 was administered by gavage at a dose of 7.5, 15, 30 mg/kg. The research result shows that the compound can inhibit secretion of inflammatory factors IL6 and IL-8 in neutrophils induced by LPS, reduce recruitment of white blood cells in alveolar lavage fluid (BALF) of a COPD mouse, inhibit generation of inflammatory cytokines IL-17A, IFN-gamma and TNF-alpha in BALF, and remarkably reduce the pathological damage degree of lung inflammation of the COPD mouse.

In a second aspect of the technical scheme, the invention provides an application of a pharmaceutical composition containing a pharmaceutically effective dose of the compound EIE-2 as shown in the formula (I) and a pharmaceutically acceptable carrier in preparing a medicament for preventing, treating or adjunctively treating chronic obstructive pulmonary disease.

According to the present invention, the compounds of the present invention may exist in the form of isomers, and generally, the term "compounds of the present invention" includes isomers of the compounds.

According to an embodiment of the invention, said compounds of the invention also include pharmaceutically acceptable salts thereof.

The invention also relates to pharmaceutical compositions containing a compound of the invention as active ingredient and conventional pharmaceutical excipients or auxiliaries. Generally, the pharmaceutical composition of the present invention contains 0.1 to 95% by weight of the compound of the present invention. The compound of the invention is generally present in an amount of 0.1 to 100mg in a unit dosage form, with a preferred unit dosage form containing 4 to 50 mg.

Pharmaceutical compositions of the compounds of the invention may be prepared according to methods well known in the art. For this purpose, the compounds of the invention can, if desired, be combined with one or more solid or liquid pharmaceutical excipients and/or adjuvants and brought into a suitable administration form or dosage form for use as human or veterinary medicine.

The invention also relates to a preparation method of the pharmaceutical composition. For this purpose, the active ingredient may, if desired, be combined with one or more solid or liquid pharmaceutical excipients and/or adjuvants in a suitable administration form or dosage form for human administration.

The pharmaceutical compositions of the present invention may be administered in unit dosage form, either enterally or parenterally, for example orally, intramuscularly, subcutaneously, nasally, oromucosally, dermally, peritoneally or rectally, and the like.

The route of administration of the pharmaceutical composition of the present invention may be administration by injection. The injection includes intravenous injection, intramuscular injection, subcutaneous injection, intradermal injection, acupoint injection, etc. The administration dosage form can be liquid dosage form or solid dosage form. For example, the liquid dosage form can be true solution, colloid, microparticle, emulsion, or suspension. Other dosage forms such as tablet, capsule, dripping pill, aerosol, pill, powder, solution, suspension, emulsion, granule, suppository, lyophilized powder for injection, etc.

The composition can be prepared into common preparations, sustained release preparations, controlled release preparations, targeting preparations and various microparticle drug delivery systems.

In order to prepare the unit dosage form into tablets, various carriers well known in the art can be widely used. Examples of the carrier are, for example, diluents and absorbents such as starch, dextrin, calcium sulfate, lactose, mannitol, sucrose, sodium chloride, glucose, urea, calcium carbonate, kaolin, microcrystalline cellulose, aluminum silicate and the like; wetting agents and binders such as water, ethylparaben, polyethylene glycol, ethanol, propanol, starch slurry, dextrin, syrup, honey, glucose solution, acacia slurry, gelatin slurry, sodium carboxymethylcellulose, shellac, methyl cellulose, potassium phosphate, polyvinylpyrrolidone, etc.; disintegrating agents such as dried starch, alginates, agar powder, brown algae starch, sodium hydrogen carbonate and citric acid, calcium carbonate, polyoxyethylene sorbitol fatty acid esters, sodium dodecyl sulfate, methyl cellulose, ethyl cellulose, etc.; disintegration inhibitors such as sucrose, glyceryl tristearate, cacao butter, hydrogenated oil and the like; absorption accelerators such as quaternary ammonium salts, sodium lauryl sulfate and the like; lubricants, for example, talc, silica, corn starch, stearate, boric acid, liquid paraffin, polyethylene glycol, and the like. The tablets may be further formulated into coated tablets, such as sugar-coated tablets, film-coated tablets, enteric-coated tablets, or double-layer and multi-layer tablets.

For making the administration units into pills, a wide variety of carriers well known in the art can be used. Examples of the carrier are, for example, diluents and absorbents such as glucose, lactose, starch, cacao butter, hydrogenated vegetable oil, polyvinylpyrrolidone, Gelucire, kaolin, talc and the like; binders such as acacia, tragacanth, gelatin, ethanol, honey, liquid sugar, rice paste or batter, etc.; disintegrating agents, such as agar powder, dried starch, alginate, sodium dodecylsulfate, methylcellulose, ethylcellulose, etc.

For making the administration unit into a suppository, various carriers well known in the art can be widely used. As examples of the carrier, there are, for example, polyethylene glycol, lecithin, cacao butter, higher alcohols, higher alcohol enzymes, gelatin, semisynthetic glycerase and the like.

To encapsulate the administration units, the active ingredient is mixed with the various carriers described above, and the mixture thus obtained is placed in hard gelatin capsules or soft gelatin capsules. Or making into microcapsule, suspending in aqueous medium to form suspension, or making into hard capsule or injection.

For example, the composition of the present invention is formulated into an injectable preparation, such as a solution, a suspension solution, an emulsion, a lyophilized powder, which may be aqueous or non-aqueous, and may contain one or more pharmaceutically acceptable carriers, diluents, binders, lubricants, preservatives, surfactants or dispersants. For example, the diluent may be selected from water, ethanol, polyethylene glycol, 1, 3-propanediol, ethoxylated isostearyl alcohol, polyoxylated isostearyl alcohol, polyoxyethylene sorbitol fatty acid enzyme, etc. In addition, for the preparation of isotonic injection, sodium chloride, glucose or glycerol may be added in an appropriate amount to the preparation for injection, and conventional cosolvents, buffers, pH adjusters and the like may also be added. These adjuvants are commonly used in the art.

In addition, if desired, colorants, preservatives, flavors, flavorings, sweeteners, or other materials may also be added to the pharmaceutical preparation.

The dose of the pharmaceutical composition of the present invention to be administered depends on many factors, such as the nature and severity of the disease to be prevented or treated, the sex, age, body weight, character and individual response of the patient or animal, the administration route, the number of administrations, etc., and thus the therapeutic dose of the present invention can be widely varied. Generally, the dosage of the compounds of the present invention used is well known to those skilled in the art. The amount of the drug actually contained in the final formulation of the pharmaceutical composition of the present invention can be adjusted appropriately to achieve the desired therapeutically effective amount, thereby achieving the objective of the present invention for treating inflammatory diseases.

In general, for a patient weighing about 75 kg, the compounds of the present invention are administered in a daily dose of 0.001mg/kg body weight to 200mg/kg body weight, preferably 1mg/kg body weight to 100mg/kg body weight. The above-mentioned dosage may be administered in a single dosage form or divided into several, e.g., two, three or four dosage forms, which is limited by the clinical experience of the administering physician and the dosage regimen. The compounds or compositions of the present invention may be administered alone or in combination with other therapeutic or symptomatic agents.

The third aspect of the present invention provides a method for preparing the derivative of the first aspect.

The starting materials for the preparation of the compounds of the invention, methyl 3-methoxy-5-hydroxybenzoate and 1- (3, 5-dimethoxyphenyl) -2-bromoacetophenone, can be prepared according to the literature [ org.biomol.chem.,2009,7(13): 2788-; the method reported by Synlett,2016,27: 1587-.

The basic synthetic route of the 3-arylbenzofuran derivative EIE-2 of the formula (I) is as follows:

the compound is a structurally modified derivative of an active natural product 3-aryl benzofuran, and the molecular formula is C₂₈H₂₅NO₆And is named as 3- (3, 5-dimethoxyphenyl) -6-methoxy-4-benzofurancarboxylic acid-4-acetylphenyl ester.

The basic synthesis method of the compound comprises the following steps:

the method comprises the following steps: methyl 3-methoxy-5-hydroxybenzoate and 1- (3, 5-dimethoxyphenyl) -2-bromoacetophenone are subjected to etherification reaction to synthesize an alpha-phenoxyketobenzoic acid methyl ester intermediate.

3-methoxy-5-hydroxybenzoic acid methyl ester and 1- (3, 5-dimethoxyphenyl) -2-bromoacetophenone in anhydrous acetone at K₂CO₃And (3) carrying out etherification reaction under the catalysis of a solid, and carrying out recrystallization or chromatographic separation and purification on the obtained product to obtain a target product, namely the intermediate of the alpha-phenoxy ketone methyl formate.

Step two: and (3) cyclizing the alpha-phenoxy ketone methyl formate intermediate under an acidic condition to synthesize a benzofuran methyl formate intermediate.

And (3) performing cyclization reaction on the product obtained in the step one in dichloromethane under the action of acidic catalysts such as methane sulfonic acid and the like, and performing recrystallization or chromatographic separation and purification on the obtained solid product to obtain the methyl benzofurancarboxylate intermediate.

In the reaction, the catalyst is Methane Sulfonic Acid (MSA), bismuth triflate (Bi (OTf)₃) Trifluoroacetic acid (TFA), ferric chloride (FeCl)₃) And the like, methanesulfonic acid and bismuth trifluoromethanesulfonate are preferred.

Step three: and (3) hydrolyzing the methyl benzofurancarboxylate intermediate under an alkaline condition to synthesize the benzofurancarboxylic acid intermediate.

Step two the resulting compound was in THF, MeOH and H₂And (3) performing hydrolysis reaction in a mixed solution of O (1: 1, v/v/v) by using an alkaline reagent such as NaOH and the like as a catalyst, neutralizing the reaction mixture by using HCl, and filtering to obtain a solid which is a benzofuran carboxylic acid intermediate.

Step four: the target compound (I) is synthesized by the esterification reaction of the intermediate of benzofuran carboxylic acid and 3-indole ethanol.

And (3) carrying out esterification reaction on the intermediate compound obtained in the third step and 3-indoleethanol in dry dichloromethane under the catalysis of DMAP and EDCI, and carrying out chromatographic separation on the obtained solid through a silica gel column to obtain a target product EIE-2 (I).

Advantageous technical effects

The invention has the advantages that: (1) the compound is a fully-synthesized 3-aryl benzofuran derivative EIE-2, and has better pharmacodynamic characteristics and relatively smaller toxic and side effects than a precursor Amurensin H thereof; (2) the compound of the invention has obvious in vivo and in vitro anti-inflammatory activity; (3) the compound has obvious inhibition effect on cigarette-induced chronic obstructive pulmonary disease of mice; (4) the product has easily obtained raw materials, simple preparation process, and easy standardized production.

Drawings

FIG. 1. Effect of EIE-2 on morphologic changes in lung organization pathology in COPD mice (HE staining, Mean. + -. SD, n ═ 4)

Detailed Description

The invention is further illustrated but is not limited by the following examples, which are purely exemplary and are intended to be a detailed description of the invention.

Example 1: preparation of compound (I) [3- (3, 5-dimethoxyphenyl) -6-methoxy-4-benzofurancarboxylic acid-2- (1H-indol-3-yl) ethyl ester ].

The synthesis procedure of compound EIE-2(I) is as follows:

the method comprises the following steps: methyl 3-methoxy-5-hydroxybenzoate and 1- (3, 5-dimethoxyphenyl) -2-bromoacetophenone are subjected to etherification reaction to synthesize the alpha-phenoxyketoformate.

Methyl 3-methoxy-5-hydroxybenzoate (4.5g,26.8mmol) and 1- (3, 5-dimethoxyphenyl) -2-bromoacetophenone (6.94g,26.8mmol) were dissolved in 150ml dry acetone, and K was slowly added with vigorous stirring₂CO₃7.39g (53.5mmol) of solid, the reaction solution was stirred at room temperature for 3h, and heating and refluxing were continued for 3 h. TLC monitoring indicated the starting material was complete. The reaction solution was cooled to room temperature, filtered through celite, washed with acetone, concentrated under reduced pressure from the organic phase, and the resulting solid was separated by 200-mesh 300-mesh silica gel column chromatography, eluted with petroleum ether-ethyl acetate-dichloromethane (30: 2:5) to give methyl α -phenoxyketobenzoate (9.49g, 98.3% yield) as a white amorphous powder.

Compound 17: white amorphous powder, m.p.96.1-99.7 ℃.¹H NMR(500MHz,acetone-d₆):δ7.19(d,J＝2.2Hz,2H),7.17(brs,1H),7.15(brs,1H),6.80(t,J＝2.3Hz,1H),6.78(t,J＝2.2Hz,1H),5.57(s,2H),3.86(s,6H),3.85(s,3H),3.83(s,3H).ESI-MS m/z 361.1[M+H]⁺,383.2[M+Na]⁺,399.0[M+K]⁺.

Step two: the methyl alpha-phenoxy ketone formate is cyclized and synthesized into methyl benzofuran formate under acidic conditions.

Methyl α -phenoxyketobenzoate (5.00g,13.9mmol) obtained in the previous step was dissolved in 500mL of dichloromethane, and 3.0mL of methanesulfonic acid was added. The reaction mixture is stirred at 40 ℃ and reacted for 30 hours, and the reaction liquid is sequentially saturated NaHCO₃The solution and water were washed, the organic phases were combined, dried over anhydrous sodium sulfate and concentrated to dryness under reduced pressure, and the resulting solid was separated by 200-mesh 300-mesh silica gel column chromatography eluting with petroleum ether-ethyl acetate-dichloromethane (60:2:5) to give a pale yellow powder as a methyl benzofurancarboxylate intermediate (3.43g, 72.1%).

Methyl benzofurancarboxylate intermediate: light yellow amorphous powder, m.p.138.9-141.1 ℃.¹H NMR(500MHz,acetone-d₆):δ7.89(s,1H),7.38(d,J＝2.2Hz,1H),7.24(d,J＝2.2Hz,1H),6.50(s,3H),3.93(s,3H),3.81(s,6H),3.30(s,3H).¹³C NMR(500MHz,acetone-d₆):δ168.05,161.79,158.60,157.97,144.09(2×C),135.81,127.09,123.82,118.81,113.72,107.16(2×C),100.17,100.10,56.44,55.69(2×C),51.61.ESI-MS m/z 365.2[M+Na]⁺.

Step three: the benzofuran benzoic acid methyl ester obtained in the last step is hydrolyzed under the alkaline condition to synthesize a benzofuran benzoic acid intermediate

The methyl benzofurancarboxylate intermediate (10.0g,29.2mmol) from the previous step was dissolved in 150mL of THF, MeOH, and H₂To the mixed solution of O (1: 1, v/v/v), NaOH (1.17 g) was added after stirring and dissolving. The reaction mixture was heated under reflux for 12h, concentrated to a small volume under reduced pressure, and 1mol/L HCl solution was added dropwise until no white precipitate precipitated out. The reaction mixture was filtered with suction, washed with distilled water and the filter cake was dried to give a white powdery solid as the benzofuran benzoic acid intermediate (9.48g, 98.9%).

Benzofuran carboxylic acid intermediate: white powder.¹H NMR(500MHz,acetone-d₆)δ7.89(s,1H),7.37(d,J＝2.0Hz,1H),7.31(d,J＝2.0Hz,1H),6.54(d,J＝2.0Hz,2H),6.43(t,J＝2.0Hz,1H),3.94(s,3H),3.78(s,6H)；¹³C NMR(125MHz,acetone-d₆):δ168.07,161.41,158.52,158.15,144.22,135.64,127.81,124.09,118.49,113.85,107.31(2×C),100.30,99.88,56.40,55.54(2×C).ESI-MS m/z329.2[M+H]⁺,351.1[M+Na]⁺,367.0[M+K]⁺.

Step four: the benzofuran carboxylic acid intermediate and 3-indole ethanol are subjected to esterification reaction to synthesize a target compound (I).

The compound obtained in step three (5g,15.2mmol) was dissolved in 500mL dry dichloromethane, DMAP (2.23g,18.45mmol) and EDCI (3.51g,18.52mmol) were added, stirring was carried out at room temperature for 20min, 3-indoleethanol (2.95g,18.24mmol) was added, and stirring was continued at room temperature for 4 h. The reaction solution was concentrated under reduced pressure, and the obtained solid was subjected to 200-mesh 300-mesh silica gel column chromatography and eluted with petroleum ether and acetone (20:1) to give 4.83g of the objective product in 67.26% yield. The physicochemical parameters of compound (I) are as follows:

compound EIE-2: a white solid.¹H NMR(500MHz,acetone-d₆):δ9.98(s,1H),7.93(s,1H),7.50(d,J＝8.0Hz,1H),7.38(d,J＝2.0Hz,1H),7.35(d,J＝8.0Hz,1H),7.24(d,J＝2.0Hz,1H),7.08(dt,J＝1.0,8.0Hz,1H),7.07(d,J＝1.0Hz,1H),7.00(dt,J＝1.0,8.0Hz,1H),6.59(d,J＝2.0Hz,2H),6.54(t,J＝2.0Hz,1H),4.02(t,J＝8.0Hz,2H),3.92(s,3H),3.80(s,6H),2.64(t,J＝8.0Hz,2H)；¹³C NMR(125MHz,acetone-d₆):δ167.90,161.91(2×C),158.62,158.07,144.20,137.58,136.02,128.42,127.56,123.92,123.55,122.16,119.47,119.24,118.57,113.75,112.15,111.50,107.16(2×C),100.36,100.14,65.93,56.44,55.72(2×C),24.81.(+)-ESI-MS m/z 472.1[M+H]⁺,494.2[M+Na]⁺,510.1[M+K]⁺.HR-ESI-MS m/z:494.1590[M+Na]⁺(calcd.for C₂₈H₂₅NO₆Na,494.1574).

Pharmacological experiments:

experimental example 1: effect of EIE-2 on LPS-induced HL-60 neutrophile cell inflammation

The experimental method comprises the following steps:

HL-60 is a neutrophil promyelocyte, which can be induced to differentiate into a monocyte, macrophage or neutrophil phenotype. DMSO is used as inducer to induce HL-60 to differentiate into neutrophile granulocyte, and inflammatory factors such as chemotactic factor IL-8 can be generated under the induction of bacterial Lipopolysaccharide (LPS) to participate and mediate inflammatory reaction. The anti-inflammatory activity of the compounds can be preliminarily observed in vitro by detecting the production amount of IL-8 in the culture supernatant of neutral granulocyte-like cells differentiated by HL-60 induced by LPS.

The experimental method comprises the following steps:

HL-60 cells which are in good growth state and are in logarithmic phase are taken and cultured for 5 to 6 days by RPMI-1640 medium containing 10 percent FBS and 1.25 percent DMSO, and the HL-60 is induced to be differentiated into the neutral granulocyte-like cells. Inoculating differentiated HL-60 cells into a 96-well plate, and adding EIE-2 with different concentrations for pre-protection for 1 h; then, LPS was added to a final concentration of 1. mu.g/ml, and 5% CO was added at 37 ℃₂After 24h of culture in an incubator, the supernatant was collected and the content of the chemokine IL-8 was determined by ELISA. When comparing between groups, the statistical comparison is carried out according to the calculated ratio of each group OD value to the blank control group average OD value.

The experimental results are as follows:

as shown in Table 1, EIE-2 significantly inhibited the production of IL-8 in the culture supernatant of LPS-induced HL-60 differentiated neutrophils compared with the model control group, and showed better in vitro anti-inflammatory activity (p < 0.01).

TABLE 1 Effect of EIE-2 on IL-8 production in LPS-induced HL-60 neutrophil-like cells (Mean. + -. Std, n ═ 3)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.01 in comparison with model control group

Experimental example 2: effect of EIE-2 on LPS-induced secretion of IL-6, a bone marrow-derived neutrophilic granulocyte in mice

The experimental method comprises the following steps: taking a plurality of SPF male BALB/c mice, killing and aseptically stripping thighbone and shinbone, cutting off two ends of the thighbone and the shinbone to expose a red marrow cavity, taking a 1ml aseptic syringe, sucking 1640 culture medium containing 5% serum, and flushing the marrow cavity to obtain marrow. Finally prepared into 2 × 10⁸～1×10⁹A single cell suspension of bone marrow in ml for use; and (4) separating to obtain the neutrophils by using a mouse bone marrow neutrophil separating medium kit. Inoculating mouse bone marrow neutrophils into 96-well plate, adding compounds with different concentrations for pre-protection for 1h, adding LPS (final concentration of 1 μ g/mL) into the plate after 1h, and treating at 37 deg.C with 5% CO₂Incubating and culturing for 6h in the environment; after 6h, the culture medium supernatant is sucked, the content of IL-6 in the supernatant is detected, and statistical comparison is carried out according to the calculated ratio of each group OD value to the blank control group average OD value when groups are compared.

The experimental results are as follows:

effect of EIE-2 on IL-6 secretion from bone marrow-derived neutrophils in mice

After being activated, the neutrophile granulocyte can produce various bioactive substances, IL-6 is a pleiotropic cytokine, when the balance in the organism is damaged or stimulated by exogenous factors such as LPS, GM-CSF and the like, the neutrophile granulocyte is induced to produce IL-6, and the produced IL-6 also acts on the neutrophile granulocyte. In the experiment, the influence of EIE-2 on the inflammatory response of the cell model is evaluated by detecting the secretion level of IL-6 of the bone marrow-derived neutrophils of the mouse. As shown in Table 2, EIE-2 significantly reduced IL-6 secretion from bone marrow-derived neutrophils in mice (p < 0.01) as compared to the model control group.

TABLE 2 Effect of EIE-2 on LPS-induced IL-6 secretion from bone marrow-derived neutrophils in mice (Mean. + -. Std, n ═ 3)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

Experimental example 3: inhibition effect of EIE-2 on mouse COPD airway inflammation induced by LPS + cigarette

The experimental method comprises the following steps: SPF male BALB/c mice, 18-20g, were randomly divided into normal control group, model control group, positive control group (dexamethasone, 0.5mg/kg, gavage), EAPP group (7.5mg/kg, 15mg/kg, 30mg/kg, gavage). Except for the blank control group, 50 mul/physiological saline solution containing 40 mul LPS is dripped into the trachea of each group of animals after the anesthesia on the 1 st day of the experiment, and 50 mul/physiological saline solution containing 30 mul LPS is dripped into the 13 th weather tube; and on the 2 nd to 12 th days and the 14 th to 28 th days of the experiment, the mice are put into a micro-environment preparation system (the cigarette smoke is 300ppm, the temperature is 22 ℃ to 28 ℃, and the oxygen is more than or equal to 18.0 percent) for smoking for 1 h/time and 1 time per day; meanwhile, the administration group is subjected to intragastric administration 1 hour before the daily smoking, and the blank control group and the model control group are administered with the same volume of the menstruum. 24 hours after the last administration, a part of lung tissue of the mice was taken and subjected to histopathological examination. Perfusing the rest groups of mice with 0.7mL of precooled physiological saline, washing for 3 times, sucking out bronchoalveolar lavage fluid (BALF), centrifuging, and analyzing the content of IL-17A, IFN-gamma and TNF-alpha in the supernatant; the cells were resuspended in PBS buffer and differential white blood cell counts were performed.

The experimental results are as follows:

(1) effect of EIE-2 on inflammatory pathological lesions of COPD mouse lung tissue

As shown in the pathological picture of FIG. 1 and the evaluation results of inflammation pathology in Table 3.1, the alveolar wall of the model group is widened, epithelial cells on the alveolar wall are swollen, rounded and partially exfoliated, macrophages are observed in the alveolar space, focal inflammatory cells infiltrate around bronchioles and bronchioles, and the alveolar space at the edge of lung tissues is expanded. As can be seen, the EIE-2 has obvious improvement effect (p is less than 0.05) on the inflammatory pathological change of lung tissues of COPD mice when being administrated by gastric gavage under the dosage of 30 mg/kg.

TABLE 3.1 Effect of EIE-2 on the assessment of pathological inflammation of COPD mouse lung tissue (Mean. + -. Std, n ═ 4)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05 compared to model control

(2) Inhibition of inflammatory cell recruitment in alveolar lavage fluid (BALF) in COPD mice by EIE-2

[ Effect of EIE-2 on the Total number of leukocytes in BALF in COPD mice

COPD is characterized by chronic inflammation throughout the airways, lung parenchyma and pulmonary vessels, which is manifested by an increase in neutrophils, T lymphocytes and macrophages within the lung. Activated inflammatory cells release a series of inflammatory mediators that disrupt lung structures or mediators that sustain neutrophil inflammation. The experiment was aimed at investigating the effect of EIE-2 on total leukocyte recruitment in BALF in COPD mice, and the results are shown in Table 3.2.

As a result: the administration of EIE-2 by gavage at a dose of 30mg/kg reduced total inflammatory cell recruitment in BALF of COPD mice, with significant differences compared to the model group (p < 0.01).

TABLE 3.2 Effect of EIE-2 on the total number of leukocytes in BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

② Effect of EIE-2 on neutrophil differential counts in BALF of COPD mice

Neutrophils play an important role in the pathogenesis of COPD, releasing serine proteases and inducing emphysema-like pathological changes in humans in animals. Neutrophils have a short lifespan and circulate very rapidly through recruitment to the airways and passage through the interstitial space. Pathological studies have demonstrated that an increase in the number of neutrophils in bronchial tissue in some COPD patients correlates with the degree of airflow obstruction. COPD patients who smoke have an increased number of neutrophils in their airways, particularly those with chronic bronchitis. The experiment was aimed at investigating the effect of EIE-2 on neutrophil recruitment in the BALF of COPD mice, and the results are shown in Table 3.3.

As a result: the administration of EIE-2 by gavage at a dose of 30mg/kg reduced neutrophil recruitment in BALF of COPD mice, with significant differences compared to the model group (p < 0.01).

TABLE 3.3 Effect of EIE-2 on neutrophil differential counts in the BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

(iii) Effect of EIE-2 on the differential enumeration of monocytes/macrophages in the BALF of COPD mice

Smokers and COPD patients have increased levels of macrophages in their lungs compared to normal populations, and macrophages are mostly accumulated in the alveoli, bronchioles and small airways. The macrophage number of alveolar wall is positively correlated with the severity of light and moderate emphysema and small airway diseases of COPD patients. COPD progresses slowly and chronically in tissue lesions and lesions, parallel to the long-term increase in macrophages, are seen. Macrophages may induce emphysema by releasing matrix metalloproteinases which results in abnormally increased capacity for degradation of elastic tissues. The experiment was aimed at investigating the effect of EIE-2 on monocyte/macrophage recruitment in BALF in COPD mice, and the results are shown in Table 3.4.

As a result: the administration of EIE-2 by gavage at a dose of 30mg/kg reduced monocyte/macrophage recruitment in BALF in COPD mice, with significant differences compared to the model group (p < 0.01).

TABLE 3.4 Effect of EIE-2 on monocyte/macrophage differential counts in BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.01 in comparison with model control group

(3) Inhibition of inflammatory factor production in alveolar lavage fluid (BALF) of COPD mice by EIE-2

[ Effect of EIE-2 on TNF-alpha production in BALF of COPD mice

The pro-inflammatory cytokine TNF- α is a promoter in the pathogenesis of COPD. In patients with COPD, TNF- α levels are higher than normal and TNF- α is secreted by cultured bronchial epithelial cells exposed to cigarette smoke. TNF-alpha can promote degranulation of neutrophils, induce proliferation and high secretion of mucosal cells, increase IL-8 production of epithelial cells, increase matrix metalloproteinase production of macrophages, and promote airway hyperreactivity. The experiment was aimed at investigating the effect of EIE-2 on TNF- α production in BALF in COPD mice, and the results are shown in Table 3.5.

As a result: the EIE-2 can reduce the production level of TNF-alpha in BALF of COPD mice by intragastric administration at the dose of 7.5, 15 and 30mg/kg, and compared with a model group, the difference is significant (p is less than 0.01).

TABLE 3.5 Effect of EIE-2 on TNF-. alpha.production in BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

② Effect of EIE-2 on IL-17A production in BALF of COPD mice

IL-17A is an important cytokine involved in the inflammation of COPD airways, and in the process of COPD progression, IL-17 induces the activation and aggregation of neutrophils, so that airway goblet cells secrete mucus, and lung injury is caused. Studies show that IL-17 in trachea and lung parenchyma of COPD patients is remarkably higher than that of healthy people and is positively correlated with the severity of the disease, and IL-17 levels of smokers are also higher than those of non-smokers, so that IL-17 is involved in airway inflammatory reaction and airway remodeling of COPD patients to cause airway obstruction. The experiment was aimed at investigating the effect of EIE-2 on IL-17A production in BALF in COPD mice, and the results are shown in Table 3.6.

As a result: the EIE-2 can reduce the IL-17A production level in BALF of COPD mice by intragastric administration at the dose of 15mg/kg and 30mg/kg, and has a significant difference (p < 0.05 or 0.01) compared with a model group.

TABLE 3.6 Effect of EIE-2 on IL-17A production in BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

(iii) Effect of EIE-2 on IFN- γ production in COPD mice BALF

IFN-gamma is also an important factor participating in the generation and development of COPD and can be used as one of important indexes for evaluating the COPD condition, thereby having important reference value. The experiment was aimed at investigating the effect of EIE-2 on IFN- γ production in BALF in COPD mice, and the results are shown in Table 3.7.

As a result: the EIE-2 can reduce the generation level of IFN-gamma in BALF of COPD mice by stomach irrigation at the dose of 7.5, 15 and 30mg/kg, and has significant difference (p is less than 0.05 or 0.01) compared with a model group.

TABLE 3.7 Effect of EIE-2 on IFN- γ production in BALF of COPD mice (Mean. + -. Std, n ═ 8)

Remarking: compared with the blank control group, # # p is less than 0.01; p < 0.05, p < 0.01, compared to model control

The research results show that the 3-arylbenzofuran derivative EIE-2 can obviously improve the pathological change of lung tissue inflammation of a COPD mouse, inhibit the number of total leucocytes, neutrophils, macrophages and the like in BALF, reduce the generation levels of inflammatory factors TNF-alpha, IL-17A, IFN-gamma and the like in BALF, is obvious in dosage of 30mg/kg, and has an obvious improvement effect on the inflammation of COPD airways. Moreover, EIE-2 has no toxic or side effect, and has very wide application and development prospect in the treatment of chronic obstructive pulmonary diseases.

Claims (5)

1. The application of the 3-aryl benzofuran derivative EIE-2 shown as the formula (I) and the pharmaceutically acceptable salts thereof in preparing medicines for treating and/or preventing chronic obstructive pulmonary diseases;

2. the use of a pharmaceutical composition for the manufacture of a medicament for the treatment and/or prevention of chronic obstructive pulmonary disease, wherein the pharmaceutical composition comprises an effective amount of the derivative EIE-2 or a pharmaceutically acceptable salt thereof according to claim 1 and a pharmaceutically acceptable carrier or adjuvant.

3. The use according to claim 2, wherein said pharmaceutical composition further comprises other active ingredients, said other ingredients comprising one or more of antiviral drugs, antitumor drugs, antitubercular drugs, immunosuppressive agents, hepatoprotective drugs, and nutrients.

4. Use according to claim 2, characterized in that said pharmaceutical composition is selected from the group consisting of tablets, capsules, pills, injections.

5. Use according to claim 2, characterized in that said pharmaceutical composition is selected from the group consisting of sustained release formulations, controlled release formulations, and various microparticle delivery systems.

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