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Volumn 12, Issue 2, 1999, Pages 204-213

The major metabolite of equilin, 4-Hydroxyequilin, autoxidizes to an o- quinone which isomerizes to the potent cytotoxin 4-Hydroxyequilenin-o- quinone

Author keywords

[No Author keywords available]

Indexed keywords

4 HYDROXYEQUILENIN O QUINONE; 4 HYDROXYEQUILIN; CONJUGATED ESTROGEN; CYTOTOXIN; EQUILIN; ESTRADIOL; ESTROGEN DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0032973129     PISSN: 0893228X     EISSN: None     Source Type: Journal    
DOI: 10.1021/tx980217v     Document Type: Article
Times cited : (94)

References (52)
  • 1
    • 0030755411 scopus 로고    scopus 로고
    • New developments in postmenopausal hormone replacement therapy
    • Prelevic, G., and Jacobs, H. S. (1997) New developments in postmenopausal hormone replacement therapy. Current Opinion in Obstetrics Gynecology 9, 207-212.
    • (1997) Current Opinion in Obstetrics Gynecology , vol.9 , pp. 207-212
    • Prelevic, G.1    Jacobs, H.S.2
  • 3
    • 0029071008 scopus 로고
    • Hormone-replacement therapy: Breast versus heart versus bone
    • Davidson, N. E. (1995) Hormone-Replacement Therapy: Breast Versus Heart Versus Bone. N. Engl. J. Med. 332, 1638-1639.
    • (1995) N. Engl. J. Med. , vol.332 , pp. 1638-1639
    • Davidson, N.E.1
  • 4
    • 0032513345 scopus 로고    scopus 로고
    • New role for estrogen in cancer?
    • Service, R. F. (1998) New role for estrogen in cancer? Science 279, 1631-1633.
    • (1998) Science , vol.279 , pp. 1631-1633
    • Service, R.F.1
  • 5
    • 0027167145 scopus 로고
    • P450 enzymes of estrogen metabolism
    • Martucci, C. P., and Fishman, J. (1993) P450 enzymes of estrogen metabolism. Pharmacol. Ther. 57, 237-257.
    • (1993) Pharmacol. Ther. , vol.57 , pp. 237-257
    • Martucci, C.P.1    Fishman, J.2
  • 6
    • 0000652198 scopus 로고
    • Mechanism of metabolic activation and inactivation of catecholestrogens: A basis of genotoxicity
    • Liehr, J. G. (1994) Mechanism of metabolic activation and inactivation of catecholestrogens: A basis of genotoxicity. Polycyclic Aromat. Compd. 6, 229-239.
    • (1994) Polycyclic Aromat. Compd. , vol.6 , pp. 229-239
    • Liehr, J.G.1
  • 7
    • 0029890377 scopus 로고    scopus 로고
    • Molecular mechanisms of estrogen carcinogenesis
    • Yager, J. D., and Liehr, J. G. (1996) Molecular mechanisms of estrogen carcinogenesis. Annu. Rev. Pharmacol. Toxicol. 36, 203-232.
    • (1996) Annu. Rev. Pharmacol. Toxicol. , vol.36 , pp. 203-232
    • Yager, J.D.1    Liehr, J.G.2
  • 8
    • 0030986245 scopus 로고    scopus 로고
    • Hormone-associated cancer: Mechanistic similarities between breast cancer and estrogen-induced kidney carcinogenesis in hamsters
    • Liehr, J. G. (1997) Hormone-associated cancer: Mechanistic similarities between breast cancer and estrogen-induced kidney carcinogenesis in hamsters. Environ. Health Perspect. 105 (S3), 565-569.
    • (1997) Environ. Health Perspect. , vol.105 , Issue.S3 , pp. 565-569
    • Liehr, J.G.1
  • 9
    • 0031848636 scopus 로고    scopus 로고
    • Functional role of estrogen metabolism in target cells: Review and perspectives
    • Zhu, B. T., and Conney, A. H. (1998) Functional role of estrogen metabolism in target cells: Review and perspectives. Carcinogenesis 19, 1-27.
    • (1998) Carcinogenesis , vol.19 , pp. 1-27
    • Zhu, B.T.1    Conney, A.H.2
  • 10
    • 0031741669 scopus 로고    scopus 로고
    • Role of quinoids in estrogen carcinogenesis
    • Bolton, J. L., Pisha, E., Zhang, F., and Qiu, S. (1998) Role of quinoids in estrogen carcinogenesis. Chem. Res. Toxicol. 11, 1113-1127.
    • (1998) Chem. Res. Toxicol. , vol.11 , pp. 1113-1127
    • Bolton, J.L.1    Pisha, E.2    Zhang, F.3    Qiu, S.4
  • 11
    • 0027097569 scopus 로고
    • Synthesis and characterization of estrogen 2,3- and 3,4-quinones. Comparison of DNA adducts formed by the quinones versus horseradish peroxidase-activated catechol estrogens
    • Dwivedy, I., Devanesan, P., Cremonesi, P., Rogan, E., and Cavalieri, E. (1992) Synthesis and characterization of estrogen 2,3- and 3,4-quinones. Comparison of DNA adducts formed by the quinones versus horseradish peroxidase-activated catechol estrogens. Chem. Res. Toxicol. 5, 828-833.
    • (1992) Chem. Res. Toxicol. , vol.5 , pp. 828-833
    • Dwivedy, I.1    Devanesan, P.2    Cremonesi, P.3    Rogan, E.4    Cavalieri, E.5
  • 12
    • 0029005370 scopus 로고
    • An estrogen-nucleic acid adduct. Electroreductive intermolecular coupling of 3,4-estrone-o-quinone and adenine
    • Abul-Hajj, Y. J., Tabakovic, K., and Tabakovic, I. (1995) An estrogen-nucleic acid adduct. Electroreductive intermolecular coupling of 3,4-estrone-o-quinone and adenine. J. Am. Chem. Soc. 117, 6144-6145.
    • (1995) J. Am. Chem. Soc. , vol.117 , pp. 6144-6145
    • Abul-Hajj, Y.J.1    Tabakovic, K.2    Tabakovic, I.3
  • 13
    • 0029680465 scopus 로고    scopus 로고
    • Molecular characteristics of catechol estrogen quinones in reactions with deoxyribonucleosides
    • Stack, D. E., Byun, J., Gross, M. L., Rogan, E. G., and Cavalieri, E. L. (1996) Molecular characteristics of catechol estrogen quinones in reactions with deoxyribonucleosides. Chem. Res. Toxicol. 9, 851-859.
    • (1996) Chem. Res. Toxicol. , vol.9 , pp. 851-859
    • Stack, D.E.1    Byun, J.2    Gross, M.L.3    Rogan, E.G.4    Cavalieri, E.L.5
  • 14
    • 0030911971 scopus 로고    scopus 로고
    • Estrogennucleic acid adducts: Reaction of 3,4-estrone-o-quinone with nucleic acid bases
    • Akanni, A., Tabakovic, K., and Abul-Hajj, Y. J. (1997) Estrogennucleic acid adducts: Reaction of 3,4-estrone-o-quinone with nucleic acid bases. Chem. Res. Toxicol. 10, 477-481.
    • (1997) Chem. Res. Toxicol. , vol.10 , pp. 477-481
    • Akanni, A.1    Tabakovic, K.2    Abul-Hajj, Y.J.3
  • 15
    • 0030797641 scopus 로고    scopus 로고
    • Estrogen-nucleic acid adducts: Reaction of 3,4-estrone-o-quinone radical anion with deoxynucleosides
    • Akanni, A., and Abul-Hajj, Y. J. (1997) Estrogen-nucleic acid adducts: Reaction of 3,4-estrone-o-quinone radical anion with deoxynucleosides. Chem. Res. Toxicol. 10, 760-766.
    • (1997) Chem. Res. Toxicol. , vol.10 , pp. 760-766
    • Akanni, A.1    Abul-Hajj, Y.J.2
  • 16
    • 0004949368 scopus 로고
    • Estrogen-induced endogenous DNA adduction: Possible mechanism of hormonal cancer
    • Liehr, J. G., Avitts, T. A., Randerath, E., and Randerath, K. (1986) Estrogen-induced endogenous DNA adduction: Possible mechanism of hormonal cancer. Proc. Natl. Acad. Sci. U.S.A. 83, 5301-5305.
    • (1986) Proc. Natl. Acad. Sci. U.S.A. , vol.83 , pp. 5301-5305
    • Liehr, J.G.1    Avitts, T.A.2    Randerath, E.3    Randerath, K.4
  • 17
    • 0023202816 scopus 로고
    • Localization of estrogen-induced DNA adducts and cytochrome P450 activity at the site of renal carcinogenesis in the hamster kidney
    • Liehr, J. G., Hall, E. R., Avitts, T. A., Randerath, E., and Randerath, K. (1987) Localization of estrogen-induced DNA adducts and cytochrome P450 activity at the site of renal carcinogenesis in the hamster kidney. Cancer Res. 47, 2156-2159.
    • (1987) Cancer Res. , vol.47 , pp. 2156-2159
    • Liehr, J.G.1    Hall, E.R.2    Avitts, T.A.3    Randerath, E.4    Randerath, K.5
  • 18
    • 0028960390 scopus 로고
    • 32P-postlabeling in the dorsolateral prostate of NBL/Cr rats treated with estradiol-17β and testosterone
    • 32P-postlabeling in the dorsolateral prostate of NBL/Cr rats treated with estradiol-17β and testosterone. Carcinogenesis 16, 951-954.
    • (1995) Carcinogenesis , vol.16 , pp. 951-954
    • Han, X.1    Liehr, J.G.2    Bosland, M.C.3
  • 20
    • 0020471249 scopus 로고
    • Relative rates of 2- and 4-hydroxyestrogen synthesis are dependent on both substrate and tissue
    • Purdy, R. H., Moore, P. H., Williams, M. C., Goldzheher, H. W., and Paul, S. M. (1982) Relative rates of 2- and 4-hydroxyestrogen synthesis are dependent on both substrate and tissue. FEBS Lett. 138, 40-44.
    • (1982) FEBS Lett. , vol.138 , pp. 40-44
    • Purdy, R.H.1    Moore, P.H.2    Williams, M.C.3    Goldzheher, H.W.4    Paul, S.M.5
  • 21
    • 0021934592 scopus 로고
    • Estrogen 2- and 4-hydroxylase activity, catechol estrogen formation, and implications for estrogen carcinogenesis in the hamster kidney
    • Li, S. A., Klicka, J. K., and Li, J. J. (1985) Estrogen 2- and 4-hydroxylase activity, catechol estrogen formation, and implications for estrogen carcinogenesis in the hamster kidney. Cancer Res. 45, 181-185.
    • (1985) Cancer Res. , vol.45 , pp. 181-185
    • Li, S.A.1    Klicka, J.K.2    Li, J.J.3
  • 22
    • 0029050292 scopus 로고
    • Carcinogenic activities of various steroidal and nonsteroidal estrogens in the hamster kidney: Relation to hormonal activity and cell proliferation
    • Li, J. J., Li, S. A., Oberley, T. D., and Parsons, J. A. (1995) Carcinogenic activities of various steroidal and nonsteroidal estrogens in the hamster kidney: relation to hormonal activity and cell proliferation. Cancer Res. 55, 4347-4351.
    • (1995) Cancer Res. , vol.55 , pp. 4347-4351
    • Li, J.J.1    Li, S.A.2    Oberley, T.D.3    Parsons, J.A.4
  • 23
    • 0343144815 scopus 로고    scopus 로고
    • Mechanism of cytochrome P450-catalyzed aromatic hydroxylation of estrogens
    • Sarabia, S. F., Zhu, B. T., Kurosawa, T., Tohma, M., and Liehr, J. G. (1997) Mechanism of cytochrome P450-catalyzed aromatic hydroxylation of estrogens. Chem. Res. Toxicol. 10, 767-771.
    • (1997) Chem. Res. Toxicol. , vol.10 , pp. 767-771
    • Sarabia, S.F.1    Zhu, B.T.2    Kurosawa, T.3    Tohma, M.4    Liehr, J.G.5
  • 25
    • 0031426130 scopus 로고    scopus 로고
    • Bioreductive activation of catechol estrogen-ortho-quinones: Aromatization of the B ring in 4-hydroxyequilenin markedly alters quinoid formation and reactivity
    • Shen, L., Pisha, E., Huang, Z., Pezzuto, J. M., Krol, E., Alam, Z., van Breemen, R. B., and Bolton, J. L. (1997) Bioreductive activation of catechol estrogen-ortho-quinones: Aromatization of the B ring in 4-hydroxyequilenin markedly alters quinoid formation and reactivity. Carcinogenesis 18, 1093-1101.
    • (1997) Carcinogenesis , vol.18 , pp. 1093-1101
    • Shen, L.1    Pisha, E.2    Huang, Z.3    Pezzuto, J.M.4    Krol, E.5    Alam, Z.6    Van Breemen, R.B.7    Bolton, J.L.8
  • 27
    • 0030688956 scopus 로고    scopus 로고
    • Reaction of the Premarin metabolite 4-hydroxyequilenin semiquinone radical with 2′-deoxyguanosine: Formation of unusual cyclic adducts
    • Shen, L., Qiu, S., van Breemen, R. B., Zhang, F., Chen, Y., and Bolton, J. L. (1997) Reaction of the Premarin metabolite 4-hydroxyequilenin semiquinone radical with 2′-deoxyguanosine: Formation of unusual cyclic adducts. J. Am. Chem. Soc. 119, 11126-11127.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 11126-11127
    • Shen, L.1    Qiu, S.2    Van Breemen, R.B.3    Zhang, F.4    Chen, Y.5    Bolton, J.L.6
  • 28
    • 0031931940 scopus 로고    scopus 로고
    • Alkylation of 2′-deoxynucleosides and DNA by the Premarin metabolite 4-hydroxyequilenin semiquinone radical
    • Shen, L., Qiu, S., Chen, Y., Zhang, F., van Breemen, R. B., Nikolic, D., and Bolton, J. L. (1998) Alkylation of 2′-deoxynucleosides and DNA by the Premarin metabolite 4-hydroxyequilenin semiquinone radical. Chem. Res. Toxicol. 11, 94-101.
    • (1998) Chem. Res. Toxicol. , vol.11 , pp. 94-101
    • Shen, L.1    Qiu, S.2    Chen, Y.3    Zhang, F.4    Van Breemen, R.B.5    Nikolic, D.6    Bolton, J.L.7
  • 29
    • 0031692626 scopus 로고    scopus 로고
    • The equine estrogen metabolite 4-hydroxyequilenin causes DNA single strand breaks and oxidation of DNA bases in vitro
    • Chen, Y., Shen, L., Zhang, F., Lau, S. S., van Breemen, R. B., Nikolic, D., and Bolton, J. L. (1998) The equine estrogen metabolite 4-hydroxyequilenin causes DNA single strand breaks and oxidation of DNA bases in vitro. Chem. Res. Toxicol. 11, 1105-1111.
    • (1998) Chem. Res. Toxicol. , vol.11 , pp. 1105-1111
    • Chen, Y.1    Shen, L.2    Zhang, F.3    Lau, S.S.4    Van Breemen, R.B.5    Nikolic, D.6    Bolton, J.L.7
  • 30
    • 0003401491 scopus 로고
    • NIH Publication No. 81-2385, U.S. Government Printing Office, Washington, DC
    • National Institutes of Health (1981) NIH Guidelines for the Laboratory Use of Chemical Carcinogens. NIH Publication No. 81-2385, U.S. Government Printing Office, Washington, DC.
    • (1981) NIH Guidelines for the Laboratory Use of Chemical Carcinogens
  • 31
    • 0001144822 scopus 로고
    • Reactions with nitrosodisulfonate (III). Equilenin-quinone
    • Teuber, H. J. (1953) Reactions with nitrosodisulfonate (III). Equilenin-quinone. Chem. Ber. 86, 1495-1499.
    • (1953) Chem. Ber. , vol.86 , pp. 1495-1499
    • Teuber, H.J.1
  • 32
    • 0032973128 scopus 로고    scopus 로고
    • Synthesis of the equine estrogen metabolites 2-hydroxyequilin and 2-hydroxyequilenin
    • Zhang, F., and Bolton, J. L. (1999) Synthesis of the equine estrogen metabolites 2-hydroxyequilin and 2-hydroxyequilenin. Chem. Res. Toxicol. 12, 200-203.
    • (1999) Chem. Res. Toxicol. , vol.12 , pp. 200-203
    • Zhang, F.1    Bolton, J.L.2
  • 33
    • 0025055648 scopus 로고
    • Enzyme induction in the cytochrome P-450 system
    • Okey, A. B. (1990) Enzyme induction in the cytochrome P-450 system. Pharmacol. Ther. 45, 241-298.
    • (1990) Pharmacol. Ther. , vol.45 , pp. 241-298
    • Okey, A.B.1
  • 35
    • 77957000392 scopus 로고
    • DT-Diaphorase
    • Ernster, L. (1967) DT-Diaphorase. Methods Enzymol. 10, 309-317.
    • (1967) Methods Enzymol. , vol.10 , pp. 309-317
    • Ernster, L.1
  • 36
    • 0021112677 scopus 로고
    • Butylated hydroxy-anisole-stimulated NADPH oxidase activity in rat liver microsomal fractions
    • Cummings, S. W., and Prough, R. A. (1983) Butylated hydroxy-anisole-stimulated NADPH oxidase activity in rat liver microsomal fractions. J. Biol. Chem. 258, 12315-12319.
    • (1983) J. Biol. Chem. , vol.258 , pp. 12315-12319
    • Cummings, S.W.1    Prough, R.A.2
  • 37
    • 0021194159 scopus 로고
    • Quantitative reversed-phase high-performance liquid chromatography of major and modified nucleosides in DNA
    • Gehrke, C. W., McCune, R. A., and Kenneth, C. K. (1984) Quantitative reversed-phase high-performance liquid chromatography of major and modified nucleosides in DNA. J. Chromatogr. 301, 199-219.
    • (1984) J. Chromatogr. , vol.301 , pp. 199-219
    • Gehrke, C.W.1    McCune, R.A.2    Kenneth, C.K.3
  • 38
    • 0029850686 scopus 로고    scopus 로고
    • Alkylation of 2′-deoxynucleosides and DNA by quinone methides derived from 2,6-di-tert-butyl-4-methylphenol
    • Lewis, M. A., Yoerg-Graff, D., Bolton, J. L., and Thompson, J. A. (1996) Alkylation of 2′-deoxynucleosides and DNA by quinone methides derived from 2,6-di-tert-butyl-4-methylphenol. Chem. Res. Toxicol. 9, 1368-1374.
    • (1996) Chem. Res. Toxicol. , vol.9 , pp. 1368-1374
    • Lewis, M.A.1    Yoerg-Graff, D.2    Bolton, J.L.3    Thompson, J.A.4
  • 39
    • 0002265018 scopus 로고
    • Protocols for screening chemical agents and natural products against animal tumors and other biological systems
    • third edition
    • Geran, R. I., Greenberg, N. H., McDonald, M. M., Schumacher, A. M., and Abbott, B. J. (1972) Protocols for screening chemical agents and natural products against animal tumors and other biological systems (third edition). Cancer Chemother. Rep. 3, 1-103.
    • (1972) Cancer Chemother. Rep. , vol.3 , pp. 1-103
    • Geran, R.I.1    Greenberg, N.H.2    McDonald, M.M.3    Schumacher, A.M.4    Abbott, B.J.5
  • 40
    • 0027404651 scopus 로고
    • Cytotoxic and antimalarial bisbenzylisoquinoline alkaloids from Stephania Erecta
    • Likhitwitayawuid, K., Angerhofer, C. K., Cordell, G. A., and Pezzuto, J. M. (1993) Cytotoxic and antimalarial bisbenzylisoquinoline alkaloids from Stephania Erecta. J. Nat. Prod. 56, 30-38.
    • (1993) J. Nat. Prod. , vol.56 , pp. 30-38
    • Likhitwitayawuid, K.1    Angerhofer, C.K.2    Cordell, G.A.3    Pezzuto, J.M.4
  • 41
    • 0030890101 scopus 로고    scopus 로고
    • Cell-based assay for the determination of estrogenic and anti-estrogenic activities
    • Pisha, E., and Pezzuto, J. M. (1997) Cell-based assay for the determination of estrogenic and anti-estrogenic activities. Methods Cell Sci. 19, 37-43.
    • (1997) Methods Cell Sci. , vol.19 , pp. 37-43
    • Pisha, E.1    Pezzuto, J.M.2
  • 42
    • 0023655814 scopus 로고
    • Semiquinone anion radicals from addition of amino acids, peptides, and proteins to quinones derived from oxidation of catechols and catecholamines: An ESR stabilization study
    • Kalyanaraman, B., Premovic, P. I., and Sealy, R. C. (1987) Semiquinone anion radicals from addition of amino acids, peptides, and proteins to quinones derived from oxidation of catechols and catecholamines: An ESR stabilization study. J. Biol. Chem. 262, 11080-11087.
    • (1987) J. Biol. Chem. , vol.262 , pp. 11080-11087
    • Kalyanaraman, B.1    Premovic, P.I.2    Sealy, R.C.3
  • 45
    • 0001992708 scopus 로고
    • Examination of polycyclic aromatic hydrocarbon o-quinones produced by dihydrodiol dehydrogenase as substrates for redoxcycling in rat liver
    • Flowers-Geary, L., Harvey, R. G., and Penning, T. M. (1992) Examination of polycyclic aromatic hydrocarbon o-quinones produced by dihydrodiol dehydrogenase as substrates for redoxcycling in rat liver. Life Sci. Adv.: Biochem. 11, 49-58.
    • (1992) Life Sci. Adv.: Biochem. , vol.11 , pp. 49-58
    • Flowers-Geary, L.1    Harvey, R.G.2    Penning, T.M.3
  • 46
    • 0029924611 scopus 로고    scopus 로고
    • Bioactivation of estrone and its catechol metabolites to quinoidglutathione conjugates in rat liver microsomes
    • Iverson, S. L., Shen, L., Anlar, N., and Bolton, J. L. (1996) Bioactivation of estrone and its catechol metabolites to quinoidglutathione conjugates in rat liver microsomes. Chem. Res. Toxicol. 9, 492-499.
    • (1996) Chem. Res. Toxicol. , vol.9 , pp. 492-499
    • Iverson, S.L.1    Shen, L.2    Anlar, N.3    Bolton, J.L.4
  • 47
    • 0029949969 scopus 로고    scopus 로고
    • p-Quinone methides are the major decomposition products of catechol estrogen o-quinones
    • Bolton, J. L., and Shen, L. (1996) p-Quinone methides are the major decomposition products of catechol estrogen o-quinones. Carcinogenesis 17, 925-929.
    • (1996) Carcinogenesis , vol.17 , pp. 925-929
    • Bolton, J.L.1    Shen, L.2
  • 48
    • 0028285123 scopus 로고
    • Evidence that 4-allyl-ortho-quinones spontaneously rearrange to their more electrophilic quinone methides: Potential bioactivation mechanism for the hepatocarcinogen safrole
    • Bolton, J. L., Acay, N. M., and Vukomanovic, V. (1994) Evidence that 4-allyl-ortho-quinones spontaneously rearrange to their more electrophilic quinone methides: Potential bioactivation mechanism for the hepatocarcinogen safrole. Chem. Res. Toxicol. 7, 443-450.
    • (1994) Chem. Res. Toxicol. , vol.7 , pp. 443-450
    • Bolton, J.L.1    Acay, N.M.2    Vukomanovic, V.3
  • 49
    • 0029061720 scopus 로고
    • The influence of the para-alkyl substituent on the isomerization of o-quinones to p-quinone methides: Potential bioactivation mechanism for catechols
    • Iverson, S. L., Hu, L. Q., Vukomanovic, V., and Bolton, J. L. (1995) The influence of the para-alkyl substituent on the isomerization of o-quinones to p-quinone methides: Potential bioactivation mechanism for catechols. Chem. Res. Toxicol. 8, 537-544.
    • (1995) Chem. Res. Toxicol. , vol.8 , pp. 537-544
    • Iverson, S.L.1    Hu, L.Q.2    Vukomanovic, V.3    Bolton, J.L.4
  • 51
    • 0344696927 scopus 로고
    • Calculations on quinonoid compounds. II. Ground-state properties of quinones
    • Gleicher, G. J., Church, D. F., and Arnold, J. C. (1974) Calculations on quinonoid compounds. II. Ground-state properties of quinones. J. Am. Chem. Soc. 96, 2403-2409.
    • (1974) J. Am. Chem. Soc. , vol.96 , pp. 2403-2409
    • Gleicher, G.J.1    Church, D.F.2    Arnold, J.C.3


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