Environmental compounds are known to be involved in both the generation and prevention of many<br>human cancers. It is important to discover naturally occurring or synthetic compounds which can block the process of<br>carcinogenesis. We have focused attention on several organosulfur compounds (OSCs) in garlic and onion, and<br>analyzed their potential for chemoprevention in the post-initiation stage in a liver medium-term bioassay (Ito test) and a<br>multi-organ carcinogenesis bioassay. In the ITO test, rats were given diethylnitrosamine (DEN), 200 mg/kg b.w., i.p.;<br>starting 2 weeks later they were treated with test chemicals for 6 weeks and then killed. All rats were subjected to 2/3<br>hepatectomy 1 week after the start of test chemical treatment. Inhibitory effects of a number of compounds could be<br>identified in terms of reduced numbers and areas of liver glutathione S-transferase placental (GST-P) positive foci. In the<br>multi-organ carcinogenesis bioassay, rats were given DEN, N-methyl-N-nitrosourea, N-butyl-N-(4-hydroxybutyl)nitrosamine, N,N8-dimethylhydrazine, and dihydroxy-dipropylnitrosamine during the first 4 weeks, followed by test chemicals<br>for 24 weeks. Various organs were examined. As a result, oil-soluble OSCs such as methyl propyl disulfide and<br>propylene sulfide demonstrated inhibitory effects on the development of GST-P positive foci. Moreover, water-soluble<br>OSCs như S-methylcysteine và cysteine giảm tương tự hình thành tập trung GST-P. Ngược lại, OSCs như diallyl <br>sulfua, diallyl trisulfide, và allyl methyl trisulfide tăng cường hình thành các ổ tế bào gan bị thay đổi như vậy. Ức chế <br>khả năng gây ung thư ruột kết và thận đã được quan sát ở chuột được điều trị bằng diallyl disulfide. Như vậy, kết quả cho thấy <br>rằng một số OSCs phát huy tác dụng ngăn ngừa ung thư trên ung thư hóa. Nó phải, tuy nhiên, nên nhớ rằng <br>họ cũng có thể chứng minh tiềm năng thúc đẩy, tùy thuộc vào cơ quan kiểm tra
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