| Co-Investigator(Kenkyū-buntansha) |
MORI Hideki Gifu Univ.Sch.Med., Pathology, Professor, 医学部, 教授 (70021433)
YOSHIMI Naoki Gifu Univ.Sch.Med., Pathology, Instructor, 医学部, 講師 (30166996)
SUGIE Shigeyuki Gifu Univ.Sch.Med., Animal Fac., Associate Professor, 医学部附属動物実験施設, 助教授 (60187648)
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| Research Abstract |
To clarify carcinogenesis process of oral cancer and to prevent this cancer, molecular analysis and search of chemopreventive agents against oral carcinogenesis were done using a 4-nitroquinoline 1-oxide (4-NQO)-induced rat oral carcinogenesis model. The results obtained were as follows : 1.Molecular analysis using PCR-SSCP technique revealed infrequent Ha-ras and absence of Ki-ras, N-ras, and p53 mutations in 4-NQO induced rat oral lesions. 2.Histological studies revealed mutistep nature of 4-NQO-induced oral carcinogenesis and strong expression of GGT and GST-P or weakly positive for c-myc, c-fos, c-Ha-ras, c-erbB,p53 in the lesions. 3.Protocatechuic acid (PCA), hesperidin, curcumin, 1'-acetoxychavicol acetate, beta-carotene, astaxanthin, and canthaxanthin effectively suppressed rat oral carcinogenesis. 4.Indole-3-carbinol could inhibit spontaneous endometrial cancer development as well as oral and liver cell neoplasms. 5.PCA,astaxanthin, and canthaxanthin could also inhibit other organs' tumorigenesis (colon, liver, stomach, and bladder) in rats. 6.KYN-54 and mofarotene prevented rat oral carcinogenesis. 7.PCA had anti-progression effects on rat oral carcinogenesis. 8.These results may indicate that all tested compounds are possible chemopreventive agents against oral cancer. Although inhibition in cell proliferation activity in the oral mucosa might be suspected, further studies on the precise mechanisms of inhibition should be done.
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