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• W2567826945 abstract "Depending primarily on the degree and route of exposure, chemicals may adversely affect the function and/or structure of living organisms. The qualitative and quantitative characterization of these harmful or toxic effects is essential for an evaluation of the potential hazard posed by a particular chemical. It is also valuable to understand the mechanisms responsible for the manifestation of toxicity—that is, how a toxicant enters an organism, how it interacts with target molecules, and how the organism deals with the insult. An understanding of the mechanisms of toxicity is of both practical and theoretical importance. Such information provides a rational basis for interpreting descriptive toxicity data, estimating the probability that a chemical will cause harmful effects, establishing procedures to prevent or antagonize the toxic effects, designing drugs and industrial chemicals that are less hazardous, and developing pesticides that are more selectively toxic for their target organisms. Elucidation of the mechanisms of chemical toxicity has led to a better understanding of fundamental physiologic and biochemical processes ranging from neurotransmission (e.g., curare-type arrow poisons) to deoxyribonucleic acid (DNA) repair (e.g., alkylating agents). Pathologic conditions such as cancer and Parkinson’s disease are better understood because of studies on the mechanism of toxicity of chemical carcinogens and 1,2,3,6tetrahydro-1-methyl-4-phenylpyridine (MPTP), respectively. Continued research on mechanisms of toxicity will undoubtedly continue to provide such insights. This chapter reviews the cellular mechanisms that contribute to the manifestation of toxicities. Although such mechanisms are dealt with elsewhere in this volume, they are discussed in detail in this chapter in an integrated and comprehensive manner. We provide an overview of the mechanisms of chemical toxicity by relating a series of events that begins with exposure, involves a multitude of interactions between the invading toxicant and the organism, and culminates in a toxic effect. This chapter focuses on mechanisms that have been identified definitively or tentatively in humans or animals. As a result of the huge number of potential toxicants and the multitude of biological structures and processes that can be impaired, there are a tremendous number of possible toxic effects. 2996R_ch03_035-081 4/16/01 9:35 AM Page 35" @default.
• W2567826945 created "2017-01-13" @default.
• W2567826945 creator A5056232739 @default.
• W2567826945 creator A5076743166 @default.
• W2567826945 date "2001-01-01" @default.
• W2567826945 modified "2023-10-01" @default.
• W2567826945 title "MECHANISMS OF TOXICITY" @default.
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