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Diethylnitrosamine에 의하여 유발된 마우스 간 종양의 CYP1A2 메틸화와 발현
진보환(Bohwan Jin),오새진(Saejin Oh),류덕영(Doug-Young Ryu) 한국환경성돌연변이발암원학회 2006 한국환경성돌연변이·발암원학회지 Vol.26 No.3
Cytochrome P450 1A2 (CYP1A2) is a xenobiotic metabolizing enzyme that is tissue-specifically expressed in the mammalian liver. In this study, the extent of CYP1A2 promoter methylation was analyzed to determine its potential role in the regulation of CYP1A2 in diethylnitrosamine (DEN)-induced mouse liver tumors. CYP1A2 mRNA was under-expressed about three fold in DEN-induced liver tumors compared to agematched control livers. The CYP1A2 promoter was hypermethylated in DEN-induced liver tumors compared to controls, especially in a promoter domain close to the coding region. These results suggest that promoter methylation is involved in the regulation of CYP1A2 in mouse liver tumors.
초임계이산화탄소를 이용한 탈카페인녹차 열수추출물의 포유동물 세포주를 이용한 염색체이상시험
구윤창(Yun-chang Koo),이현순(Hyun-sun Lee),박병규(Byung-gyu Park),김은진(Eun-jin Kim),이선주(Sun-joo Lee),김경헌(Kyoung Hoen Kim),김영석(Young Suk Kim),김광옥(Kim Kwang ok),정영신(Young-shin Chung),이광원(Kwang-won Lee) 한국환경성돌연변이발암원학회 2006 한국환경성돌연변이·발암원학회지 Vol.26 No.3
There are 10~30% polyphenol and 2~4% caffeine in green tea. Caffeine is a kind of alkaloid containing nitrogen which cause stimulation, impatience, headache, insomnia, low birth weight infant. Because of these negative effect, decaffeined beverage came out and decaffeined coffee already have a big market since 1970s. Having proving the physiologic functions of green tea, high consumption of coffee is shifting to green tea. Because of the carcinogenic effect of the organic solvents, decaffeine processing with supercritical carbon dioxide has industrialized and have an advantage in environment-friendly and minimized flavor loss. Decaffeined green tea using supercritical carbon dioxide is considered to be safe but there are not enough study. We investigated the chromosome aberration test with mammalian cell line, CHL. When the cells were treated with 5000, 2000, 1000 ㎍/㎖ and compared with the negative controls, there were no significant (P > 0.05) increased chromosome aberration. Same results was observed when adding S9 mixture or not. As a result, water extract of decaffeined green tea using supercritical carbon dioxide does not induce chromosome aberration.