Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
  • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
  • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D307/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
  • A61P19/10—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease for osteoporosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
  • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
  • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D307/38—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D307/40—Radicals substituted by oxygen atoms
  • C07D307/46—Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
  • C07D307/48—Furfural

Definitions

• the present invention relates to furan derivatives and pharmaceutical compositions containing the same, more particularly, to furan derivatives having an improved effect on bone proliferation, compared to the conventional agents for treatment of osteoporosis, their pharmaceutically acceptable salts, and pharmaceutical compositions comprising such furan derivatives as effective ingredients .
• Osteoporosis is a disease caused by reduction of the content of calcium which determines the physical strength of bone by various reasons (genetic factors, insufficient intake of nutrients, change of hormones, physical inactivity, habits, etc.). In this disease, the medullary cavity is enlarged, and bone becomes easily fractured even by a weak impact, resulting in tremendous inconvenience.
• bone mineral density starts to decrease gradually after age 30, and estrogen levels drop sharply during menopause.
• the production of B lymphocytes is increased, such as by action of interleukin 7 (IL-7), and B cell progenitors are thus accumulated in the bone marrow, thereby promoting IL-6 synthesis.
• IL-7 interleukin 7
• the currently available therapeutic agents for osteoporosis include bisphosphonates (e.g., alendronate, etidronate) , hormones (e.g., raloxifene) , vitamin D and its analogues, calcitonin and calcium.
• bisphosphonates are disadvantageous in terms of being slowly absorbed by the gastrointestinal tract, being administered by an intricate procedure, and causing inflammation in the esophagus when administration is not successfully achieved.
• the hormonal drugs should be administered for the whole life, and increase the prevalence of breast cancer and uterine cancer.
• the vitamin preparations are expensive and not clearly identified for its therapeutic efficacy for osteoporosis.
• calcitonin is expensive and its administration is difficult.
• the calcium preparations are known to have mild side effects, but are a preventive, not therapeutic, agent.
• Sex hormones are mainly used for prevention, rather than treatment, of menopausal disorders and cardiovascular diseases, and effective in treating osteoporosis by inhibiting osteoclasts .
• sex hormones have side effects including the risk of breast cancer and bleeding, and are not convenient in use.
• the calcium preparations aid only skeleton formation in rapidly growing children, juveniles and pregnant or lactating women.
• FIG. 1 is a graph showing degree of proliferation of
• MG63 osteoblasts when treated with the Compound 1 of the present invention, prepared in Example 1, at various concentrations, in comparison with a control not treated with the compound;
• FIG. 2 is a graph showing alkaline phosphatase (ALP) activity when HOS cells were treated with the Compound 1 of the present invention, prepared in Example 1, in comparison with a control not treated with the compound;
• ALP alkaline phosphatase
• FIG. 3 is a graph showing expression levels of Runx2 that is a transcription factor for differentiation of osteoblasts when 6xOSE2-Luc vector-transfected C2C12 cells were treated with the Compound 1 of the present invention, prepared in Example 1, in comparison with a control not treated with the compound;
• FIG. 4 is a graph showing expression levels of osteoprotegerin (OPG) when MG63 osteoblasts were treated with the Compound 1 of the present invention, prepared in
• Example 1 where the OPG expression levels were analyzed by an ELISA assay
• FIG. 5 is a graph showing production of TRAP (tartrate-resistant acid phosphatase) -positive multinucleated cells when osteoclast progenitor cells were treated with the Compound 1 of the present invention, prepared in Example 1;
• TRAP heartrate-resistant acid phosphatase
• FIG. 6 is a graph showing the area of formed resorption pits when osteoclast progenitor cells, cultured in calcium phosphate-coated plates, were treated with the Compound 1 of the present invention, prepared in Example 1, in comparison with a control not treated with the compound;
• FIGS. 7a and 7b are microscopic photographs (12.5x magnification) showing no trabecular bone loss in ovariectomized white mice orally administered for four weeks with 10 mg/day of the Compound 1 of the present invention, prepared in Example 1, where 7a and 7b show cross-sectional views of leg bone of white mice not treated and treated with the Compound 1, respectively;
• FIGS. 8a and 8b are microscopic photographs (40x magnification) showing no trabecular bone loss in ovariectomized white mice orally administered for four weeks with 10 mg/day of the Compound 1 of the present invention, prepared in Example 1, where 8a and 8b show cross-sectional views of leg bone of white mice not treated and treated with the Compound 1, respectively;
• FIGS. 9a and 9b are microscopic photographs (40x magnification) showing no trabecular bone loss in ovariectomized white mice subcutaneously administered for four weeks with 10 mg of the Compound 1 of the present invention, prepared in Example 1, where 9a and 9b show cross-sectional views of leg bone of white mice not treated and treated with the Compound 1, respectively;
• FIGS. 10a and 10b are microscopic photographs (40x magnification) showing no trabecular bone loss in ovariectomized white mice bred with solid foodstuff for four weeks to develop osteoporosis and then orally administered for four weeks with 220 ⁇ l/day of the Compound 1 of the present invention, prepared in Example 1, where 10a and 10b show cross-sectional views of leg bone of white mice not treated and treated with the Compound 1, respectively;
• FIG. 11 is a graph showing remarkably increased bone mineral density (BMD) in ovariectomized white mice orally administered for four weeks with 10 mg/day of the Compound 1 of the present invention, prepared in Example 1, where, four weeks after ovariectomy, BMD was elevated compared to that before ovariectomy; and
• FIG. 12 is a graph showing a very slight reduction of BMD in ovariectomized white mice bred with solid foodstuff for four weeks to develop osteoporosis and then orally administered for four weeks with 220 ⁇ l/day of the Compound 1 of the present invention, prepared in Example 1, compared to a control.
• BMD bone mineral density
• R 1 and R 2 are the same or different from each other and each represents hydrogen, naphthalene, aryl group having three or less substitution groups selected from among methyl, methoxy, chloro, bromo, iodo, nitro and fluorine, or a C ⁇ C 3 aliphatic alkyl group, or R 1 and R 2 are linked with carbon, oxygen, hydrogen, or nitrogen having an C ⁇ -C 3 aliphatic alkyl group and together represent an aliphatic alkyl group.
• furan derivative represented by the Formula 1 include furan derivatives having substitution groups, X and Y, listed in Tables 1 to 7, below.
• the present invention include all possible solvates and hydrates prepared therefrom.
• the compounds of the Chemical Formula 1 may be used in the form of pharmaceutically acceptable salts.
• the salts may be prepared as pharmaceutically acceptable metal salts by using pharmaceutically acceptable bases. Alkali or alkaline earth metal salts are obtained, for example, by dissolving compounds in an excessive alkali metal hydroxide or alkali earth metal hydroxide solution, filtering the resulting solution to remove undissolved compounds, and evaporating and drying the filtrate.
• the metal salts are prepared in the form of sodium, potassium or calcium salts.
• silver salts may be prepared by reacting alkali metal or alkali earth metal salts with a suitable silver salt (e.g., silver nitrate).
• a suitable silver salt e.g., silver nitrate.
• the furan derivatives of the present invention may be prepared by extraction and chemical synthesis processes commonly used in the art, but not limited to them. In an embodiment, the furan derivatives of the present invention may be prepared, as follows.
• furan-2-carboxyaldehyde derivatives in which X is H are prepared by reacting 5-chloromethylfuran-2-carboxyaldehyde with substituted aliphatic alcohol, substituted arylalcohol or various amines in a solvent of acetonitrile using potassium carbonate to produce 5-substituted methyl furan-2- carboxyaldehyde (when X is H and Y is OH, the furan-2- carboxyaldehyde compound was isolated from a plant Rehmannia glutinosa Libosch by an extraction process and evaluated for physiological activity) .
• the 5- chloromethylfuran-2-carboxyaldehyde compound used as a starting material and represented by the Formula II, is prepared from glucose and hydrochloric acid according to the method described by W.N. Haworth and . G. M. Jones, J. Chem . Soc . 667-670, 1944.
• furan-2-carboxyaldehyde derivatives in which X is not H are obtained by primarily producing 5-chloromethylfuran-2- carboxychloride of the Formula IV using 5- hydroxymethylfuran-2-carboxylic acid of the Formula III, reacting the first product with various alcohols and amine derivatives to produce 5-chloromethyl furan-2-carboxylic acid ester and amide derivatives, and reacting the second product with a neucleophile selected from among various alcohols, amines and thioureas to produce 5-substituted methyl furan-2-carboxylic acid ester and amide derivatives of the Formula I .
• the 5-hydroxymethylfuran-2-carboxylic acid used as a starting material and represented by the Formula III, is prepared according to the method described by W. N. Haworth et al . , J. Chem . Soc . 1513-1526, 1927.
• the present invention includes a pharmaceutical composition for preventing and treating osteoporosis, comprising a furan derivative represented by the Formula 1 or its pharmaceutically acceptable salt as an effective ingredient.
• the furan derivatives of the present invention are superior to the conventional therapeutic agents for osteoporosis, by displaying effects of stimulating proliferation of osteoblasts and increasing osteoblast activity as well as inhibiting proliferation and activity of osteoclasts.
• cell proliferation was increased to 105% or higher (see, FIG. 1), while phosphatase activity was elevated to 120% (see, FIG. 2) , compared to a control not treated with the compound.
• the compound prepared in Example 1 was found to increase the activity of Runx2 that is a transcription factor for differentiation of osteoblasts (see, FIG. 3) .
• the compound of the present invention increases the expression of osteoprotegerin (OPG) in osteoblasts, which inhibits osteoclast formation (see, FIG. 4).
• OPG osteoprotegerin
• the compound was found to inhibit bone resorption activity of osteoclasts (see, FIG. 6) .
• a pharmaceutical composition comprising the furan derivative having the aforementioned effects according to the present invention increases bone proliferation, and is thus useful for increasing children's height and preventing and treating osteoporosis, degenerative bone diseases, rheumatoid arthritis and other bone-related diseases.
• the compounds of formula 1 can be used with oral, intravenous, subcutaneous, intranasal, intrabronchial or rectal administration, and may be used with ordinary medicine forms.
• the compounds of formula 1 can be formulated into various dosage forms for oral or parenteral administration.
• pharmaceutically acceptable diluents, expedients and/or carriers including fillers, thickeners, binders, wetting agent, disintegration, surfactants, etc.
• Solid dosage forms for oral administration are exemplified by tablets, pills, powders, granules and capsules. These solid forms are prepared by admixing at least one compound of formula 1 with at least one expedient such as starch, calcium carbonate, sucrose, lactose, gelatin, etc.
• a lubricant such as magnesium styrate talc may be added.
• Suspensions, internal solutions, emulsions, syrups, etc. are liquid dosage forms for oral administration that can comprise wetting agents, sweeteners, aromatics, and/or perspectives in addition to simple diluents such as water and liquid paraffin.
• Dosage forms for parenteral administration include sterile aqueous solutions, non-aqueous solvents, suspensions, emulsions, freeze-dried agents, suppositories, etc.
• vegetable oils such as propylene glycol and polyethylene glycol or injectable esters such as ethyl oleate may be used.
• bases for suppositories Witepsol, macrogol, Tween 61, cocoa oil, laurinic acid and glycerogelatine are useful.
• Administration dosage of the compound, represented by above formula 1 is dependant on patient's condition, for example age, weight, sex, hygienic condition and seriousness of disease. If drug is administered to adult patient weighing 70 kg, administration dosage is generally. 0.01-1000 g per 1 day, preferably 0.1-500 mg per 1 day. According to diagnosis of doctor or pharmaceutist, drug can be administrated to patient once or many times at regular intervals .
• the present inventon provides functional foods, health-supporting food or special nutritional food, comprising of furan derivatives as effective ingredients.
• the term "functional food”, as used herein, is intended to indicate a food that is made by adding the furan derivatives and pharmaceutically acceptable salts thereof to a general food to improve the functionality of the general food.
• the term "health-supporting food” or "special nutritional food”, as used herein separately from the functional food, refers to a health food imparting unique health benefits upon uptake, which is. made by adding the furan derivatives and pharmaceutically acceptable salts thereof to a general food, or additionally by formulating the resulting general food into capsules, powders, suspensions, and the like.
• the health-supporting and special nutritional foods are advantageous in terms of being prepared using a food as a raw material unlike general medical drugs and thus not having side effects found in the drugs.
• the content of the furan derivatives and pharmaceutically acceptable salts thereof may vary depending on kinds of foods, and may be determined in the range of cytotoxicity evaluated in the use as the pharmaceutical composition.
• the concentrate was chromatographed in an open column of silica gel using ethylacetate and n-hexane as solvents, thus yielding 720 mg of 5-hydroxymethylfuran-2- carboxyaldehyde (melting point: 32-35°C) .
• the compound (Compound 1) of the present invention was evaluated for effects on osteoblast proliferation, differentiation and activity in the following tests.
• the human osteosarcoma cell lines MG-63 (ATCC No. CRL-1427) and HOS (ATCC No. CRL-1543), and mouse muscle C2C12 muscle cells (ATCC No. CRL-1772) were purchased from ATCC (American Type Culture Collection, Rockville, USA) , and cultured in Dulbecco ' s modified Eagle's medium (DMEM) supplemented with 10% fetal bovine serum (FBS) .
• DMEM Dulbecco ' s modified Eagle's medium
• FBS fetal bovine serum
• TCA trichloroacetic acid
• osteoblasts that are responsible for bone formation in bone tissue should be primarily proliferated.
• the number of osteoblasts was investigated.
• the cells treated with the Compound 1 of the present invention showed a proliferation rate of over 105%, compared to a control not treated with the Compound 1 (Table 8 and FIG. 1).
• alkaline phosphatase (ALP) activity was measured.
• HOS cells were aliquotted onto a 96-well microplate at a density of 5xl0 3 cells per well, and cultured. When forming a monolayer, the cells were treated with the naturally extracted compound
• Alkaline phosphatase used as an osteoblast marker, was reported to participate in several steps of bone formation (Siffert, 1958; Farley and Baylink, 1986) .
• alkaline phosphate activity as an indicator of osteoblast activity was determined in order to investigate effect of the Compound 1 on osteoblast activity.
• alkaline phosphate activity was elevated to about 121%, compared to a control not treated with the Compound 1 (Table 9 and FIG. 2).
• C2C12 cells were plated onto 6-well plates at a density of lxlO 5 cells per well, and cultured for 24 hrs in a 5% C0 2 incubator.
• the cells transiently transfected with the p6xOSE2-Luc vector using a transfection reagent, LipofectAmine, as follows.
• the plasmid DNA was reacted with the transfection reagent for 15 min to form p ⁇ xOSE2- Luc DNA: lipofectamine complexes.
• culture medium was removed from each well of the plates, the cells were washed with FBS-free DMEM, and 800 ⁇ l of FBS-free DMEM was added to each well.
• 207 ⁇ l of the formed p ⁇ xOSE2-Luc DNA: lipofectamine complexes was added to each well, followed by incubation for 3 hrs in a 5% C0 2 incubator.
• Receptor activator of NF- ⁇ B receptor is essentially required for production and activation of osteoclasts.
• RANKL is expressed in osteoblasts and mesenchymal cells, and binds to receptor activator of NF- ⁇ B (RANK) in osteoclast progenitors and osteoclasts (Hofbauer et al., 2000).
• OPG as a decoy receptor of RANKL, interferes with RANK-RANKL binding, and thus inhibits differentiation of osteoclast progenitors to osteoclasts and the activity of osteoclasts (Kong et al . , 1999; Yasuda et al., 1999; Suda et al . , 1999; Aubin et al . , 2000). This test was performed to determine whether the Compound 1 increases secretion of OPG by osteoblasts.
• bone marrow cells were isolated, as follow. After sacrificing 7-9 week female mice by cervical dislocation, femur and tibia were excised aseptically while removing attached soft tissues. After cutting both ends of long bones, 1 ml of an enzyme solution, containing 0.1% collagenase (Gibco) , 0.05% trypsin and 0.5 mM EDTA (Gibco) , was injected to the bone marrow cavity at one end using a syringe with a 2 ⁇ -guage needle, and bone marrow was then collected.
• an enzyme solution containing 0.1% collagenase (Gibco) , 0.05% trypsin and 0.5 mM EDTA (Gibco)
• bone marrow cells were collected, and cultured in ⁇ - minimum essential medium ( ⁇ -MEM) supplemented with 10% FBS for 24 hrs. Then, non-adherent cells were collected, which are osteoclast pregenitors, aliquotted onto culture plates at a density of 2xl0 5 cells per well, and cultured for 8 days in ⁇ -MEM supplemented with 20 ng/ml of macrophage- colony stimulating factor (M-CSF, Peprotech, USA) and 30. ng/ml RANKL (Peprotech, USA) . During the 8 days of culturing, the cells were treated with the Compound 1.
• M-CSF macrophage- colony stimulating factor
• osteoclast formation was investigated by fixing the cultured cells and then carrying out TRAP staining, as described in the following Experimental Example 2.2.
• resorption activity of osteoclasts was investigated by measuring the absorption area after removing osteoclasts in cultures in calcium phosphate- coated plates, as described in Experimental Example 2.3, below.
• TRAP staining was performed, as follows. After being fixed with citrate-acetate-formaldehyde for 5 min, the cells were incubated for 1 hr in acetate buffer (prewarmed at 37°C, pH 5.0) containing naphthol AS-BI phosphate, fast Garnet GBC and 7 mM tartrate buffer (pH- 5.0). TRAP-positive multinucleated cells having 3 or more- nuclei were considered as osteoclasts. The results are given in Table 12, below, and FIG. 5.
• Osteoclasts are derived from hematopoietic cells belonging to the monocyte/macrophage lineage originating in bone marrow. These mononucleated progenitor cells are carried by the bloodstream, and proliferate in the inner side of bone and fuse together to become multinucleated (Scheven et al . , 1986). Osteoclasts secrete tartrate- resistant acid phosphate (TRAP) that is used as a biochemical marker of osteoclasts while allowing discrimination of osteoclasts from other cells (Minkin, 1982) . In this test, bone marrow known to contain progenitor cells of osteoclasts was used to induce differentiation of osteoclasts, and treated with the Compound 1 of the present invention for 8 days. The formed TRAP-positive multinucleated cells containing three or more nuclei were counted as osteoclasts, and the counted cell number was compared to that of a control not treated with the Compound 1.
• TRAP tartrate-
• the differentiated osteoclasts were cultured on calcium phosphate-coated plates (OAASTM, OCT, Korea) in order to evaluate resorption activity of the cells. After removing culture medium, to remove the adherent cells, the plates were washed with distilled water three times, and incubated in 5% sodium hypochlorite for 5 min. After washing again with distilled water and drying the plates, the area of formed resorption pits was calculated by means of an Image Pro Plus software. The results are given in Table 13, below, and FIG. 6.
• differentiated osteoclasts were cultured in plates coated with calcium phosphate, where the formed matrix is similar to the inorganic portion of bone tissue (Choi et al . , 2001), while being treated with the Compound 1.
• the area of the formed absorption pits was compared to a control not treated with the Compound 1.
• Osteoclast pregenitor cells were isolated, and their differentiation to mature osteoclasts was induced, according to the same method as in the Experimental Example 2-1, while treated with each of the furan derivatives of the present invention. According to the same method as in the Experimental Example 2-2, TRAP staining performed, and TRAP-positive multinucleated cells were counted. An inhibition rate of each furan derivative against osteoclast formation was expressed as percentage, wherein the number of stained cells in a control not treated the furan derivative was arbitrarily set as 100% (Tables 14 to 16) .
• the furan derivatives of the present invention have an inhibitory effect versus osteoclast formation.
• when used in an amount when used in an amount
• the compounds 128, 147, 152, 156, 157, 165 and 187 had an inhibition rate of 4-21% versus osteoclast formation.
• most of the furan derivatives showed inhibitory effects versus osteoclast formation.
• mice with osteoporosis induced by ovariectomy were used as a disease model. After ovariectomy, mice were administered with the compound of the present invention. Tibias were dissected from the mice, and observed histologically .
• the daily dosage of the Compound 1 per female white mouse was determined based on 250 g body weight.
• a control group was fed with solid feedstuff and 30 ml water per mouse.
• a test group was administered with a mixture of 100 mg of the Compound 1 and 30 ml of water per mouse, by using a water bottle. This mixture was prepared every morning, and the remaining mixture was not discarded and mixed with a freshly prepared one next morning, wherein the fresh mixture was added to the water bottle regardless of the remaining amount according to the mouse number in a cage. Water was supplemented everyday, based on the number of mice in each group. With caution not to exchange the water bottles between the groups, everyday, the number of mice was recorded, and the mixture was prepared based on the number of mice.
• mice were administered with the Compound 1 contained in water for four weeks, as described above. Then, 16 mice from the test group and four mice from the control group were randomly selected. After checking change in body weight of the mice, tibia tissue specimens were fixed, dehydrated, cleared and stained for histological studies, according to a method known in the art. In order to evaluate therapeutic effect of the Compound 1 on osteoporosis, after ovariectomy, the mice were fed with solid feedstuff for four weeks.
• a test group was administered with the Compound 1 for four weeks, according to the same method as described above, while a control group was fed with only solid feedstuff. Eight weeks after ovariectomy, tibia tissue specimens were prepared according to a method known the art.
• the tibia tissue specimens prepared in the Experimental Example 3-2 were fixed in a Bouin' s solution for about 24 hrs. Then, the tibia tissue specimens were decalcificated with 5% nitric acid for about 60 hrs in order to remove inorganic substances including calcium from the tibias, thus softening the tibias to the degree suitable for fracture. Thereafter, the tibia tissue specimens were washed with running water for 12 hrs, sequentially dehydrated in 70%, 80%, 90%, 95% and 100% ethanol for 2 hrs three times per each case, and cleared with xylene for 2 hrs three times. Finally, the tibia tissue specimens were embedded in paraffin by being immersed in liquid paraffin for 2 hrs three times to allow penetration of paraffin into the tibias.
• Paraffin blocks were slice-cut using a rotatory microtome.
• the obtained 4- ⁇ m sections of the tibias were mounted on slide glasses coated with Poly- L -lysin, and dried by using a slide warmer (40 ⁇ 3°C) .
• the completely dried slides were deparaffinized in xylene, dehydrated in alcohol, and stained with either hematoxylin-Eosin or Gomori's trichrome.
• the stained tissues were rinsed in alcohol and cleared in xylene and alcohol.
• the slides were covered with a covering agent, and dried for 24 hrs in an incubator at 60°C, followed by light microscopic examination and capturing of the microscopic images.
• mice 20 female white mice weighing about 200 g were divided into a control group (4 mice) and a test group (16 mice) . After performing ovariectomy according to the same method as described above, the mice of the test and control groups were administered with the Compound 1 for four weeks or not, under the same conditions as described above. After checking change in body weight of the mice, tibia tissue specimens were fixed, dehydrated, cleared and stained for histological studies, according to a method known in the art.
• Preventive effect 2 of the Compound 1 on osteoporosis 20 female white mice weighing about 200 g were divided into a control group (4 mice) and a test group (16 mice) , and administered with the Compound 1 for four weeks or not. After being dissolved in 1 ml of physiological saline, 10 mg of the Compound 1 was subcutaneously injected into the mice of the test group. The mice of the control group were subcutaneously injected with 1 ml of physiological saline. After checking change in body weight of the mice, tibia tissue specimens were fixed, dehydrated, cleared and stained for histological studies, according to a method known in the art .
• mice After ovariectomy, 20 female white mice were bred with solid foodstuff for four weeks according to the same method as described above. After checking the onset of osteoporosis in the mice, the mice were divided into a control group (4 mice) and a test group (16 mice) and orally administered with 220 ⁇ l of the Compound 1 dissolved in 30 ml water for four weeks. After checking change in body weight of the mice, tibia tissue specimens were fixed, dehydrated, cleared and stained for histological studies, according to a method known in the art.
• BMD measurement was made at a voxel size of 0.1x0.1 ram 2 and threshold values of 280 mg/cm 2 for cancellous bone and 500 mg/cm 2 for compact bone.
• the analysis sites at the proximal tibias were determined by Scout scans (10 mm/sec) , and BMD was measured at three slices at the determined sites by CT scans (7 mm/sec) . BMD measurement was performed twice or more at the same site every week during four weeks.
• mice After ovariectomy, female white mice weighing about 250 g were bred for four weeks. After checking the onset of osteoporosis in the mice, each of the mice was orally administered with 220 ⁇ l of the Compound 1 dissolved in 30 ml water for four weeks.
• BMD measurement was performed before ovariectomy and every week for eight weeks after ovariectomy, using a bone mineral densitometer, XCT 540 Research SA made in Germany.
• BMD measurement was made at a voxel size of 0.1x0.1 mm 2 and threshold values of 280 mg/cm 2 for cancellous bone and 500 mg/cm 2 for compact bone.
• the analysis sites at the proximal tibias were determined by Scout scans (10 mm/sec) , and BMD was measured at three slices at the determined sites by CT scans (7 mm/sec) . BMD measurement was performed twice or more at the same site every week during eight weeks after ovariectomy.
• 6-week old SPF SD line rats were used in determining acute toxicity.
• the compounds of examples were suspended in 0.5% methylcellulose solution and orally administered once to 2 rats per group at the dosage of 1 g/kg/15 m .
• Death, clinical symptoms, and weight change in rats were observed, hematological tests and biochemical tests of blood were performed, and any abnormal signs in the gastrointestinal organs of chest and abdomen were checked with eyes during autopsy.
• test compounds did not cause any specific clinical symptoms, weight change, or death in rats. No change was observed in hematological tests, biochemical tests of blood, and autopsy. As a result, the compounds used in this experiment are evaluated to be safe substances since they do not cause any toxic change in rats up to the level of 3100 mg/kg and their estimated LD50 values are much greater than 3100 mg/kg in rats .
• the compound of example 1(5.0 mg) was mixed with 14.8 mg of lactose, 10.0 mg of polyvinyl pyrrolidone and 0.2 mg of magnesium stearate. The resultant mixture was filled with gelatine capsule.
• the above capsule was comprising; The compound of example 5.0 mg Lactose 14.8 mg
• the compound of example 1 (10 mg) was mixed with 180 mg of mannitol, 26 mg of Na 2 HP0 4 -12H 2 0 and 2974 mg of distilled water. The mixture was prepared to injectable solution. The injectable solution was sterilized at 20°C for 30 min. The above injectable solution was comprising ;
• the compound of example 1 vitamin C, powdery vitamin E, iron lactate, zinc oxide, nicotinic acid amide, Vitamin A, Vitamin Bi, Vitamin B 2 were mixed, to give beverage.
• the above beverage was comprising ;
• Nicotinic acid amide 3.5 g Vitamin A 0.2 g Vitamin Bi 0.25 g Vitamin B 2 0.3 g Distilled water conditional-weight
• the furan derivatives of the present invention do not have problems encountered in the prior art, stimulate formation and activity of osteoblasts, as well as inhibiting formation and activity of osteoclasts. Therefore, the furan derivatives are useful for increasing children' s height and preventing and treating osteoporosis, degenerative bone diseases, rheumatoid arthritis and other bone-related diseases. In addition, due to their non-toxicity, the furan derivatives are applicable as additives of health foods.

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