WO1998004541A1 - Gastroprotective flavone/flavanone compounds with therapeutic effect on inflammatory bowel disease - Google Patents
Gastroprotective flavone/flavanone compounds with therapeutic effect on inflammatory bowel disease Download PDFInfo
- Publication number
- WO1998004541A1 WO1998004541A1 PCT/KR1997/000144 KR9700144W WO9804541A1 WO 1998004541 A1 WO1998004541 A1 WO 1998004541A1 KR 9700144 W KR9700144 W KR 9700144W WO 9804541 A1 WO9804541 A1 WO 9804541A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flavone
- hydroxy
- group
- hydrogen
- alkyloxy
- Prior art date
Links
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- 229930003944 flavone Natural products 0.000 title claims abstract description 44
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- 230000002178 gastroprotective effect Effects 0.000 title description 2
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- 150000003839 salts Chemical class 0.000 claims abstract description 24
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- 150000001875 compounds Chemical class 0.000 claims description 80
- 229910052739 hydrogen Inorganic materials 0.000 claims description 31
- 239000001257 hydrogen Substances 0.000 claims description 31
- 125000003545 alkoxy group Chemical group 0.000 claims description 27
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- GHIDENQNBRLAMY-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-7-(2-hydroxyethoxy)-5,6-dimethoxychromen-4-one Chemical compound C1=C(OC)C(OC)=CC=C1C1=CC(=O)C2=C(OC)C(OC)=C(OCCO)C=C2O1 GHIDENQNBRLAMY-UHFFFAOYSA-N 0.000 claims description 3
- AGBODBJRABIDBB-UHFFFAOYSA-N 2-[2-(3,4-dimethoxyphenyl)-5-hydroxy-6-methoxy-4-oxochromen-7-yl]oxyacetic acid Chemical compound C1=C(OC)C(OC)=CC=C1C1=CC(=O)C2=C(O)C(OC)=C(OCC(O)=O)C=C2O1 AGBODBJRABIDBB-UHFFFAOYSA-N 0.000 claims description 3
- ZWVHTXAYIKBMEE-UHFFFAOYSA-N 2-hydroxyacetophenone Chemical compound OCC(=O)C1=CC=CC=C1 ZWVHTXAYIKBMEE-UHFFFAOYSA-N 0.000 claims description 3
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- XIEYTSSHRZRSKW-UHFFFAOYSA-N 2-[6-butoxy-2-(3,4-dimethoxyphenyl)-5-hydroxy-4-oxochromen-7-yl]oxyacetic acid Chemical compound C=1C(=O)C2=C(O)C(OCCCC)=C(OCC(O)=O)C=C2OC=1C1=CC=C(OC)C(OC)=C1 XIEYTSSHRZRSKW-UHFFFAOYSA-N 0.000 claims description 2
- 125000005907 alkyl ester group Chemical group 0.000 claims description 2
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
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- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
- C07D311/30—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only not hydrogenated in the hetero ring, e.g. flavones
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- A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
- C07D311/32—2,3-Dihydro derivatives, e.g. flavanones
Definitions
- the present invention relates to novel fla- vone/flavanone compounds or their pharmaceutically acceptable salts, and process for preparation thereof for protecting gastrointestinal tracts against gastritis, ulcers and inflammatory bowel disease.
- the first line therapy for gastritis and gastric ulcer is to promote the effects of treatments by attenuating the attacking factors by administering antisecret- ory agents such as antacid, H2 antagonists and proton pump inhibitors.
- antisecret- ory agents such as antacid, H2 antagonists and proton pump inhibitors.
- omeprazole or long acting H2 antagonists the duration of action was so long more than 24 hours that their long-term administration to rats caused dysplasia in epidermal cells of mucous membrane in gastrointestinal tracts (Ekman, L. et al . , Scand. J. Gastroentrol.1985, 20 suppl.108: 53).
- .And long-term administration of antisecretory agents is frequently associated with formation of gastric tumors in animals (Garner, A.
- prostaglandins such as PEI 2 , PGE 2 are mainly generated in the gastric mucosa, and they effectively prevent the experimental ulceration induced by various kinds of ulcerogens (Robert. A., 1976. Advances in Prostaglandin and Thromboxane Research, Raven Press, New York, Vol 2, p.507). It was clinically proved that misoprostol, one of the prostaglandin compounds, prevented the gastric ulcer induced by NSAIDs (Graham, D.Y., et al., Lancet 1988, 2: 1277; Edelson, J.T. , et al . , JAMA 1990, 264: 41) .
- the cytoprotective mechanism of prostaglandins includes stimulating the blood flow of gastric mucosa
- NSAIDs such as indomethacin induce adherence of leukocytes to the vascular endothelium and activation of neutrophils is accompanied by release of the active oxygens which can damage the gastrointestinal tracts (Klebanoff, S.J., Inflammation: Basic Principles and Clinical Correlates, New York: Raven, 1988, p.391-444; Vaananen P.M, et al., Am. J. Physiol., 1991, 256: G470-G475) .
- Inflammatory bowel diseases which are idiopathic chronic and refractory diseases having high relapsy, include ulcerative colitis and Crohn's disease.
- inflammatory mediators such as leukotrienes is known to induce sustaining inflammation on the mucous membrane (Rachmilewitz, D., et al., Gastroenterology, 1989, 97: 326) as well as reactive oxygen species (Keshavarzian A., et al . , Gastroenterology, 1992, 103: 177).
- leukotriene inhibitors (Wallace J.L. , et al . , Gastroenterology, 1989, 96: 29; Zingarelli B, et al . , Agents Actions 1993, 39: 150) reduced the damage of inflamed colon effectively.
- flavonoid compounds which exist in nature show various effects, for example natural flavonoids such as hypolaetin- 8-glucoside, apigenin-7,4' -dimethylether, kampferol, quercetin, naringenin, and hesperidine are known to have anti-ulcerative action (J.Pharm. Pharmacol.1984 , 36: 820 ; Ind. J. Pharm. Sci. 1981, 43: 159; Ind. J. Exp. Biol . 1988, 26: 121; Phytotherapy Res .1992 , 6: 168; ibid, 1988, 2: 137) .
- natural flavonoids such as hypolaetin- 8-glucoside, apigenin-7,4' -dimethylether, kampferol, quercetin, naringenin, and hesperidine are known to have anti-ulcerative action (J.Pharm. Pharmacol.1984 , 36: 820 ; Ind. J
- flavone/flavanone compounds in the formula (I) and their salts have better function of cytoprotection on gastrointestinal tracts including large intestine, than known compounds of flavone/flavanone .
- the present invention is to provide flavone/flavanone compounds of the formula (I) and their pharmaceutically acceptable salts.
- A, B and C which are the same or different, are respectively selected from a group consisting of hydrogen, hydroxy, unsubstituted or mono-substituted alkyloxy or cycloalkyl- oxy group.
- the preferable substituents of alkyloxy groups contain hydroxy, carboxy, alkylester of carboxy, carboxamide, N-mono or dialkyl carboxamide, N-hydroxy carboxamide, N-hydroxy N-alkyl carboxamide, and substituted or unsubstituted benzene ring.
- D and E which are the same or different, are respectively selected from a group consisting of hydrogen, hydroxy, low alkyloxy having normal or branched chain with one to six carbon atoms .
- the present invention is also to provide process for preparing flavone/flavanone compounds and their pharmaceutically acceptable salts.
- the present invention is also to provide uses of flavone/flavanone compounds having formula (I) or their pharmaceutically acceptable salts to treat gastrointestinal diseases such as gastritis and gastric ulcer, and inflammatory bowel diseases such as ulcerative colitis and Crohn's disease.
- gastrointestinal diseases such as gastritis and gastric ulcer
- inflammatory bowel diseases such as ulcerative colitis and Crohn's disease.
- Flavone/flavanone derivatives of the structures of the formula (I) of the present invention are prepared as following.
- the numbers for the position of substituen- ts are shown in the formula (I) .
- Flavone/flavanone derivatives of the formula (I) are obtained by the process which comprises aldol- condensation of 2-hydroxyacetophenone having appropriately substituted group A, B and C with benzaldehyde having appropriately substituted group D and E into forming chalcone, and followed by cyclization of the chalcone to form the skeletal structure of formula (I), removal of the protecting group of corresponding substituent of flavone /flavanone compounds of the formula (I) , and introduction of the intended substituents at the deprotected positions.
- Flavone derivatives having double bond between 2-position and 3 -position are prepared by stirring the chalcone having formula (IV) with selenium dioxide in the refluxing isoamylalcohol or dimethylsuifoxide as solvent. While flavanone derivatives having single bond between 2 -position and 3 -position can be obtained by treatment with sulfuric acid.
- Preparation of the compounds can be classified as follows according to the substituents A, B, C, D and E. ⁇ 1> In case that A and C are respectively hydroxy or substituted or unsubstituted alkyloxy groups, the compounds are prepared by the following scheme.
- hydroxy group is introduced to the compound II as shown on the scheme 1 by Elbs persulfate oxidation (J. Org. Chem. 1984, 49: 645 ) .
- Base which can be used in the above reaction is preferably selected from a group consisting of sodium hydroxide aqueous solution and tetraalkylammonium hydroxide aqueous solution.
- the appropriately substituted compound III is obtained by alkylating the introduced hydroxy group with appropriate alkylating agent
- the compound IV is obtained by aldol condensation of compound III with benzaldehyde which is appropriately substituted with R 3 and R 4 .
- Solvents which can be used for aldol condensation are lower alcohol such as methanol and ethanol and the mixed solvent of the mentioned alcohol with water.
- R- and R 2 which are either same or different, represent the appropriate protecting groups of phenoxy group such as methyl, benzyl, and benzoyl or appropriate alkyl or cycloalkyl groups.
- R-, and R 2 are respectively different protecting groups, they can be removed simultaneously (V ⁇ VI) or successively (V ⁇ VI ⁇ VII) by changing the reaction condition.
- R 1 is methyl group and R 2 is benzyl group
- R- is successively removed by Lewis acid such as alumminium chloride after R 2 is selectively removed by reaction with hydrogen using metal catalyst, or R x and R 2 can be simultaneously removed using boron trichloride or hydrochloric acid with acetic acid.
- the protecting group of phenoxy group can be simultaneously or successively removed by the mentioned process.
- Compound VIII selectively alkylated on the 7-position hydroxy group is obtained by reacting compound VI or VII with an equivalent of ⁇ -haloacetate in the presence of base in polar solvent.
- Compound IX selectively alkylated on the 5-position hydroxy group is obtained by reacting compound VIII with alkylhalide R 4 X in the presence of base in polar solvent such as DMF.
- Compound X can be prepared by removal of carboxyl protecting group and the compound XI is obtained by condensation the compound X with R 7 R B NH, wherein R 7 and R 8 which are respectively same or different, are selected from hydrogen, alkyl, hydroxy or alkoxy group.
- the condensation can be carried out by dehydration reaction using DCC (dicyclohexyl carbodiimide) or EDC
- compound X (1- (3-dimethylaminopropyl) -3 -ethyl-carbodiimide) or compound X can be converted to reactive carboxylic acid derivatives such as acid anhydride or acid chloride and then reacting it with R 7 R 8 NH to give compound XI .
- Example 3 7-hydroxy-3' ,4' , 5-trimethoxy-6-n-propyloxy flavone
- the titled product was synthesized from 4 -benzyl oxy-2, 5-dihydroxy-6-methoxy acetophenone as a starting material by the same process of the steps 2) , 3) , 4) , and 5) of the Example 1.
- Example 5 7-hydroxy-3' ,4' , 5-trimethoxy-6-n-pentyloxy flavone
- the titled product was synthesized from 4 -benzyl - oxy-2, 5-dihydroxy-6 -methoxy acetophenone as a starting material by the same process of the Example 3.
- the titled product was synthesized from 7-hydroxy -3 ', 4' , 5-trimethoxy-6-n-pentyloxy flavone as a starting material by the same process of the Example 2.
- the titled product was synthesized from 4 -benzyl oxy-2, 5-dihydroxy-6-methoxy acetophenone as a starting material by the same process of the Example 3.
- Example 8 6-ethoxy-5, 7-dihydroxy-3' ,4' -dimethoxy flavone
- the titled product was synthesized from 6 -ethoxy -7-hydroxy-3' ,4' , 5-trimethoxy flavone as a starting material by the same process of the Example 2.
- the titled product was synthesized from 4 -benzyl oxy-2, 5-dihydroxy-6 -methoxy acetophenone as a starting material by the same process of the Example 3.
- the titled product was synthesized from 6-n-butyl oxy-7-hydroxy-3 ' ,4' , 5-trimethoxy flavone as a starting material by the same process of the Example 2.
- the titled product was synthesized from 4 -benzyl oxy-2-hydroxy-5, 6-dimethoxy acetophenone as a starting material by the same process of the Example 3.
- the titled product was synthesized from 7-hydroxy -4' , 5, 6 -trimethoxy flavone as a starting material by the same process of the Example 2.
- Example 13 7-hydroxy-5, 6-dimethoxy flavone
- the titled product was synthesized from 4-benzyl oxy-2-hydroxy-5, 6 -dimethoxy acetophenone as a starting material by the same process of the steps 3) , 4) and 5) of the Example 1.
- the titled product was synthesized from 4-benzyl oxy-2 -hydroxy- 5, 6 -dimethoxy acetophenone as a starting material by the same process of the steps 3) ,4) and 5) of the Example 1.
- the titled product was synthesized from 2 -hydroxy -4 -benzyloxy acetophenone as a starting material by the same process of the Example 1.
- Example 18 3' ,4' ,7-trihydroxy-5, 6-dimethoxy flavone
- the titled product was synthesized from 4 -benzyl oxy-2-hydroxy-5, 6-dimethoxy acetophenone as a starting material by the same process of the steps 3) ,4) and 5) of the Example 1.
- the titled product was synthesized from 3' ,4' , 7-trihydroxy-5, 6-dimethoxy flavone as a starting material by the same process of the Example 2.
- the titled product was synthesized from 3' ,4' ,5,
- Example 21 7-hydroxy-6-n-pentyloxy flavone
- the titled product was synthesized from 4-benzyl oxy-2-hydroxy acetophenone as a starting material by the same process of the Example 1.
- the titled product was synthesized from 4 -benzyl oxy-2-hydroxy acetophenone as a starting material by the same process of the Example 1.
- the titled product was synthesized from 7-benzyl oxy-5 , 6-dimethoxy-4 ' -thiomethoxy flavone as a starting material by the same process of the Example 2.
- the titled product was synthesized from -benzyl oxy-5-n-pentyloxy 2 -hydroxy chalcone as a starting material by the same process of the step 1) of the Example 24.
- the titled product was synthesized from 7-benzyl oxy-5 -n-pentyloxy flavanone as a starting material by the same process of the step 5) of the Example 1.
- the titled product was synthesized from 4 -benzyloxy-2- hydroxy- 6 -methoxy acetophenone as a starting material by the same process of the steps 3) , 4) and 5) of the Example 1.
- the titled product was synthesized from 4 -benzyl oxy-3 ' , 4' , 6 -trimethoxy-2-hydroxy chalcone as a starting material by the same process of the step 1) of the Example 24.
- NMR(CDC1 3 ) 7.39(m, 5H) , 6.93(m, 3H) , 6.2l(d,
- the titled product was synthesized from 7-benzyl oxy-3 ' ,4' , 6-trimethoxy flavanone as a starting material by the same process of the step 5 ) of the Example 1.
- the titled product was synthesized from 6 -methoxy -2 -hydroxy acetophenone as a starting material by the same process of the step 3) and 4) of the Example 1.
- the titled product was synthesized from 6 -methoxy -2 -hydroxy acetophenone as a starting material by the same process of the steps 1),2),3) and 4) of the Example 1.
- the titled product was synthesized from 3' ,4' ,5, 6-tetramethoxy flavanone as a starting material by the same process of the Example 2.
- E are hydrogen or alkoxy group, respectively
- the titled product was synthesized from 5,7-di hydroxy-3' ,4' , 6-trimethoxy flavone as a starting material by the same process of the Example 34.
- the titled product was synthesized from 7-hydroxy -3' ,4' , 6 -trimethoxy flavone as a starting material by the same process of the Example 34.
- the titled compound was synthesized from 5,7-di hydroxy-3' ,4' , 6-trimethoxy flavanone as a starting material by the same process of the Example 34.
- Example 38 7-carboxymethyloxy-3 ' , 4' , 5-trimethoxy flavone
- the titled product was synthesized from 7-hydroxy -3' ,4' , 6-trimethoxy flavone as a starting material by the same process of the Example 34.
- the titled product was synthesized from 7-hydroxy -6 -n-pentyloxy flavone as a starting material by the same process of the Example 34.
- the titled product was synthesizedfrom 7-hydroxy- 3' ,4' -dimethoxy-6 -n-pentyloxy flavone as a starting material by the same process of the Example 34.
- Example 43 7-carboxymethyloxy-5-hydroxy-6 -methoxy flavone
- the titled product was synthesized from 5,7-di hydroxy-6 -methoxy flavone as a starting material by the same process of the Example 34.
- the titled product was synthesized from 5,7-di hydroxy-6 -ethoxy-3 ', 4' -dimethoxy flavone as a starting material by the same process of the Example 34.
- the titled product was synthesized from 5,7-di hydroxy-4 ' , 6-dimethoxy flavone as a starting material by the same process of the Example 34.
- the titled compound was synthesized from 5,7-di hydroxy-6 -n-butyloxy-3' , 4' -dimethoxy flavone as a starting material by the same process of the Example 34.
- Example 47 7 -carboxymethyloxy-5-hydroxy-6-n- propyloxy-3 ' , 4 ' -dimethoxy flavone
- the titled compound was synthesized from 5,7-di hydroxy-6 -n-propyloxy-3 ' ,4 ' -dimethoxy flavone as a starting material by the same process of the Example 34.
- Example 48 7-carboxymethyloxy-5-hydroxy-3' ,4' -dimethoxy flavone
- the titled compound was synthesized from 5,7-di hydroxy-3' ,4' -dimethoxy flavone as a starting material by the same process of the Example 34.
- the titled compound was synthesized from 5-benzyl oxy-7-t-butyloxycarbomethyloxy-3' , 4 ' -dimethoxy flavone as a starting material by the same process of the step 2 of the Example 34.
- the titled compound was synthesized from 7-t- butyloxycarbomethyloxy-5-hydroxy-3 ' , 4 ' -dimethoxyflavone as a starting material by the same process of the Example 49.
- the titled compound was synthesized from 7-t-butyloxycarbomethyloxy-5-hydroxy-3 ' , 4 ' -dimethoxy flavone as a starting material by the same process of the Example 49.
- A is N-alkylamidoalkyloxy
- B, C, D and E are hydrogen or alkyloxy, respectively
- the molecular structure of the compounds of the formula (I) was identified by measuring Infrared spectroscopy, Ultra-visible spectroscopy, Nuclear magnetic resonance (NMR) spectroscopy, Mass spectroscopy.
- the compounds of the formula (I) may exist in the form of free acid or their salt.
- the salts of the compounds of the formula (I) can be prepared by adding bases to the free acid, wherein the salts should be pharmaceutically acceptable salts.
- the preferable salts of the present invention are sodium salts, potassium salts, and so on.
- the compounds of the formula (I) can be administered orally or non-orally as general types of medicine. Substantially, the compounds can be administered orally or non-orally and in all the possible dosage forms.
- diluents generally used such as filler, binding agent, damping agent, dissolving agent, and surfactant can be used.
- Solid pharmaceutical preparations for oral administration contain tablet, pill, powder, granule and capsule. These solid pharmaceutical preparations are prepared from the compound or mixture of at least one of the compounds along with at least one of diluents such as starch, calcium carbonate, sucrose or lactose, and gelatin. In addition to diluents, lubricating agents such as magnesium stearate talc are used.
- diluents such as starch, calcium carbonate, sucrose or lactose, and gelatin.
- lubricating agents such as magnesium stearate talc are used.
- Liquid preparations for oral administration contain suspension, solution, emulsion or syrup and they contain damping agent, sweetener, perfume or preserving agent in addition to simple diluents such as water or liquid paraffin.
- Preparations for non-oral administration contain sterilized aqueous solutions, non-aqueous solution, suspension, emulsion, lyophilization and suppository.
- Vegetable oils such as propylene glycol, polyethylene glycol and olive oil or injectable esthers such as ethylolate can be used for non-aqueous solution or suspension.
- the basement for suppository contain witepsol, macrogol, tween 61, cacao, laurine, glyceroge- latin, etc.
- the effective amount of the compounds of the formula (I) is 0. l ⁇ 50mg/kg, preferably 0.1 ⁇ 30mg/kg.
- the compounds of the formula (I) may be administered 1-3 times a day.
- the compound was orally administered in suspension of 5% HPMC, and after 1 hour 1.5mL of 150mM HCl-80% ethanol was orally administered. After 1 hour the rat was sacrifieced and the stomach was extracted and the ulcer index was measured. The ulcer index was shown by the area of hemorrhage lesion (Mizui, T, et al . , Jpn. J. Pharmacol. 1983, 33: 939) . Table 1
- Table 1 shows that the compounds have significantly potent activity at the dose of 0.3 ⁇ 3mg, and have 10-100 times more prevention against the damage of gastric mucosa than Rebamipide which is known as the gastric mucous membrane protecting agent .
- the compound was orally administered into SD male rat (200 ⁇ 250g) . After 1 hour the stomach was extracted. The extracted stomach was immediately washed with lOmL of cold 0.25M sucrose solution. The gastric mucosa was dyed with 0.1% alcian blue solution for 2 hours. After dyeing, the gastric mucosa was washed with 0.25M sucrose solution twice for 15 minutes and for 45 minutes. The dyed gastric mucosa was treated with lOmL of 30% dioctyl sodium sulfo- succinate solution for 2 hours to extract dyed mucus completely and optical density of aqueous phase was measured spectrophotometrically at 655nm. The amount of mucus in the gastric mucosa was shown as the amount of alcian blue after calibration (Kitagawa, H., et al . , Drug Res. 1986, 36: 1240-1244) . Table 2
- IC 50 of Rebamipide which was known as hydroxy radical scavenger
- IC 50 of the compounds of the present invention were 0.4i j 1.8 ⁇ g/mL, as shown in the table 3.
- the compounds of the invention are 50-700 times more potent than Rebamipide.
- the compounds of the invention inhibit the generation of active oxygens from neutrophils or remove the generated active oxygens. These antioxidant activity of compounds of invention may defense the gastric mucosa from its damages by the active oxygens.
- HUVEC After addition of the compound to cultured HUVEC, the HUVEC was incubated at 37°C, for 30 minutes, then arachidonic acid (final concentration : 30 ⁇ M) was added, and the HUVEC was additionally incubated at 37°C for 15 minutes. The culture medium was taken, and the activity of cyclooxygenase for 6-Keto-PGF j ⁇ o? or PGE 2 was measured by radioimmunoassay (Mitchell, J.A. , et al . , Pro. Natl. Acad. Sci. USA 1994, 90: 11693-11697).
- flavonoids affect the metabolic pathway of arachidonic acid, and these compounds of present invention promoted activation of cyclooxygenase as shown in table 4 and 5.
- the function of promoting biosynthesis of prostaglandins will increase the release of prostaglandins in the gastric mucosa and will eventu- ally lead to the inhibition of the damage of the gastric mucosa .
- Damage of the gastric mucosa can be caused by inflammatory reaction cascade such as adhesion of leukocytes to the vascular endothelium and activation of inflammatory cell, and particularly, gastric ulcer induced by NSAIDs such as indomethacine is explained with inflammatory reaction induced by the increase of leukotr- iens in the gastric mucosa.
- the compounds of the invention is to inhibit the activaty of 5-lipoxygenase, which is leukotrien synthesizing enzyme on the metabolic pathway of arachidonic acid and thus the compound is anticipated to have anti-inflammatory effects.
- mesalazine (5-amino salicylic acid) was used for oral administration and prednisolone was used for rectal administration.
- mesalazine 5-amino salicylic acid
- prednisolone was used for rectal administration.
- each group of the rats were put under ether anesthesis, the colon was extracted and the degree of adhesion and extension of the large intestine were measured and their lesion scores were recorded. After 1% formalin solution was injected to the cavity of the extracted colon to inflate, the both ends of it were bonded with each other and it was all-fixed in 1% formalin solution for 2 hours. The all-fixed colon was cut to lengthy direction and washed to remove surrounding fat tissues and connective fissaes.
- Macroscopic evaluation We measured the number and the width of the ulcer and lesion area formed in the large intestine, by using modified Wallace's method (Can. J. Physiol. Pharmacol., 1988, 66: 422). We scored the lesion examined with the naked eye and compared the average value of each group.
- the standards of lesion scores as criterion of the damage of the colon by Wallace's method is as followings.
- mice Microscopic evaluation : We trimmed the colon giving 3 cm interval from the rectum to the cecum, including the site of lesion examined with the naked eye, to make at least 4 specimens per an individual. We did pathological tissue examination on the specimens, and using modified method of Moyama (Ann. Clin. Lab. Sci., 1990, 20: 420), we marked scores of them and accepted the highest score as the score of the individual's. When the lesion can not be examined with the naked eye, we trimmed the other specimen which has the lesion, with 3 cm interval. Table 8
- the compounds of invention showed the inhibiting effect on the model of inflammatory colitis by oral or rectal administration as shown in the table 8 and 9. These anti-colitic effect might be ascribed to the activity of mucous membrane protection, anti-oxidation and leukotrien synthesis inhibition and furthermore the compounds are more potent than mesalazine broadly used in the market .
- Acute toxicity was examined by using ICR mouse.
- the compounds dissolved in distilled water were administered orally.
- three individuals/group were given 5 g/kg of 7-carboxymethyloxy-3' , 4 ' , 5, 6- tetramethoxy flavone and 7-caroxymethyloxy-3 ' ,4' , 5- trimethoxy flavone, respectively, and all of the animals did not show any particular clinical symptoms and all survived .
- the compounds are proved to be safe materials for oral administration, whose LD 50 is over 5 g/kg.
- Flavone and flavanone derivatives of the formula (I) of the present invention stimulate cylo-oxygenase activity.
- cyclooxygenase catayzes synthesis of prosta-glandins such as PGE 2 and PGI 2 , which have gastric mucosa protecting function.
- the compounds of the present invention also inhibited activation of 5-lipoxygenase and resulted the inhibition of synthesis of leukotriens, which are major inflammatory mediator. They also have activity to inhibit synthesis of active oxygens produced by inflammatory cells which is activated during immune reaction.
- the compounds show good effects on inflammatory colitis, ileitis, local ileitis, granulative colitis, hard wall colitis, ileocolitis, arthritis induced with ulcerative colitis, and uveitis.
- These diseases are known to be caused by increasing leukotrien synthesis in mucous membrane, or by active oxygen produced by activated inflammatory cells.
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Abstract
Description
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JP50871298A JP3377214B2 (en) | 1996-07-25 | 1997-07-25 | Flavones and flavanone compounds have a curative effect on inflammatory bowel disease by protecting the gastrointestinal tract |
US09/214,889 US6025387A (en) | 1996-07-25 | 1997-07-25 | Gastroprotective flavone/flavanone compounds with therapeutic effect on inflammatory bowel disease |
DE69715216T DE69715216T2 (en) | 1996-07-25 | 1997-07-25 | GASTROPROTECTIVE FLAVON / FLAVANON COMPOUNDS WITH THERAPEUTIC EFFECT ON INFLAMMABLE COLON DISEASES |
DK97932032T DK0915864T3 (en) | 1996-07-25 | 1997-07-25 | Gastroprotective flavone / flavanone compounds with therapeutic effect on inflammatory bowel diseases |
CA002261267A CA2261267C (en) | 1996-07-25 | 1997-07-25 | Gastroprotective flavone/flavanone compounds with therapeutic effect on inflammatory bowel disease |
EP97932032A EP0915864B1 (en) | 1996-07-25 | 1997-07-25 | Gastroprotective flavone/flavanone compounds with therapeutic effect on inflammatory bowel disease |
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Also Published As
Publication number | Publication date |
---|---|
CA2261267C (en) | 2003-10-07 |
DE69715216D1 (en) | 2002-10-10 |
DK0915864T3 (en) | 2002-12-30 |
CA2261267A1 (en) | 1998-02-05 |
EP0915864A1 (en) | 1999-05-19 |
JPH11514015A (en) | 1999-11-30 |
KR100447918B1 (en) | 2005-09-28 |
EP0915864B1 (en) | 2002-09-04 |
DE69715216T2 (en) | 2003-05-08 |
US6025387A (en) | 2000-02-15 |
JP3377214B2 (en) | 2003-02-17 |
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