Question

Describe the differences between direct-acting and indirect acting carcinogens

Answer 1

The carcinogens are compounds which have the tendency to cause cancer. The direct acting carcinogens are those which react directly on the DNA. This means that they do not require anything to interact with the DNA and hence is able to interact directly. They are highly reactive and genotoxic in nature. When it comes to the indirect acting carcinogen, they cannot bind to the DNA directly but needs to be biotransformed into a reactive chemicals post which it can bind to the DNA. The indirect carcinogen needs to be first metabolized before binding to the DNA. Some example of direct acting carcinogen are alkyl or aryl epoxide, nitrosamides, sulfonate etc. Example of indirect acting carcinogen are polycyclic aromatic hydrocarbons, aromatic amines, aflatoxin B1 etc.