​Metabolic Activation of Drugs and Other Xenobiotics in Hepatocellular Carcinoma

​Metabolic Activation of Drugs and Other Xenobiotics in Hepatocellular Carcinoma
Author: Grace S. N. Lau
Publisher: Chinese University Press
Total Pages: 344
Release: 1997
Genre: Medical
ISBN: 9789622017443

'The metabolic activation of many drugs and xenobiotics in vivo is effected through the large family of cytochrome P450s enzymes that catalyse a diverse spectrum of reactions including the metabolism of both endogenous and exogenous compounds. There is considerable evidence suggesting that changes in P450 activities can affect the in vivo toxicity of drugs in both animals and humans. Oxidative metabolism by cytochrome P450 enzymes has been implicated in the pathogenesis of cancer, through the formation of toxic intermediates and carcinogenic metabolites are formed from drugs and xenobiotics. A marked overall increase in the metabolic activation of the commonly used analgesic agent, paracetamol, was found in patients with hepatocellular carcinoma, as indicated by a much higher percentage recovery of the oxidative metabolites cysteine and mercapturate conjugates, compared to healthy controls and patients with chronic hepatitis B infection. It was through that metabolic activation of some drugs and xenobiotics through the actions of specific cytochrome P450s may be enhanced in patients with hepatocellular carcinoma.

Metabolism of Drugs and Other Xenobiotics

Metabolism of Drugs and Other Xenobiotics
Author: Pavel Anzenbacher
Publisher: John Wiley & Sons
Total Pages: 755
Release: 2012-05-29
Genre: Medical
ISBN: 352732903X

A practice-oriented desktop reference for medical professionals, toxicologists and pharmaceutical researchers, this handbook provides systematic coverage of the metabolic pathways of all major classes of xenobiotics in the human body. The first part comprehensively reviews the main enzyme systems involved in biotransformation and how they are orchestrated in the body, while parts two to four cover the three main classes of xenobiotics: drugs, natural products, environmental pollutants. The part on drugs includes more than 300 substances from five major therapeutic groups (central nervous system, cardiovascular system, cancer, infection, and pain) as well as most drugs of abuse including nicotine, alcohol and "designer" drugs. Selected, well-documented case studies from the most important xenobiotics classes illustrate general principles of metabolism, making this equally useful for teaching courses on pharmacology, drug metabolism or molecular toxicology. Of particular interest, and unique to this volume is the inclusion of a wide range of additional xenobiotic compounds, including food supplements, herbal preparations, and agrochemicals.

Transporters and Drug-Metabolizing Enzymes in Drug Toxicity

Transporters and Drug-Metabolizing Enzymes in Drug Toxicity
Author: Albert P. Li
Publisher: John Wiley & Sons
Total Pages: 530
Release: 2021-07-27
Genre: Medical
ISBN: 1119170842

TRANSPORTERS AND DRUG-METABOLIZING ENZYMES IN DRUG TOXICITY Explore up-to-date coverage on the interaction between drug metabolism enzymes, transporters, and drug toxicity with this leading resources Transporters and Drug-Metabolizing Enzymes in Drug Toxicity delivers a comprehensive and updated review of the relationship between drug metabolism, transporters, and toxicity, providing insights into a major challenge in drug development – accurate assessment of human drug toxicity. Combining two disciplines frequently considered independently of one another, the book combines drug metabolism and toxicology with a focus on the role of biotransformation on drug toxicity and as a major factor for species and individual differences. Mechanism and species differences in drug metabolizing enzymes and transporters are discussed, as are the methods used to investigate the role of drug metabolizing enzymes and transporters in drug toxicity. Finally, the distinguished authors describe promising new experimental approaches to accurately assessing human drug toxicity via the consideration of human-specific drug metabolism in toxicity assays. In addition to topics as diverse as extended clearance models, experimental approaches for the estimation of DILI potential of drug candidates and roles of transporters in renal drug toxicity, readers will also enjoy the inclusion of such subjects as: A thorough overview of and introduction to drug metabolism and transporters and drug toxicity An exploration of drug metabolism enzymes and transporter activities as risk factors of marketed drugs associated with drug-induced fatalities A discussion of human-based in vitro experimental models for the evaluation of metabolism-dependent drug toxicity A treatment of mechanism-based experimental models for the evaluation of BSEP inhibition and DILI An examination of transporters and cochlea toxicity Perfect for scientists, students, and practitioners with interests in metabolism, toxicology, and drug development in the pharmaceutical industry, Transporters and Drug-Metabolizing Enzymes in Drug Toxicity will also earn a place in the libraries of medicinal chemists, pharmacologists, biochemists, toxicologists, and regulators in the pharmaceutical and health industries.

How Tobacco Smoke Causes Disease

How Tobacco Smoke Causes Disease
Author: United States. Public Health Service. Office of the Surgeon General
Publisher:
Total Pages: 728
Release: 2010
Genre: Government publications
ISBN:

This report considers the biological and behavioral mechanisms that may underlie the pathogenicity of tobacco smoke. Many Surgeon General's reports have considered research findings on mechanisms in assessing the biological plausibility of associations observed in epidemiologic studies. Mechanisms of disease are important because they may provide plausibility, which is one of the guideline criteria for assessing evidence on causation. This report specifically reviews the evidence on the potential mechanisms by which smoking causes diseases and considers whether a mechanism is likely to be operative in the production of human disease by tobacco smoke. This evidence is relevant to understanding how smoking causes disease, to identifying those who may be particularly susceptible, and to assessing the potential risks of tobacco products.

Mammalian Toxicology

Mammalian Toxicology
Author: Mohamed Abou-Donia
Publisher: John Wiley & Sons
Total Pages: 716
Release: 2015-05-04
Genre: Medical
ISBN: 1119940419

Mammalian Toxicology surveys chemical agents and examines how such chemicals impact on human health, emphasizing the importance in minimizing environmental exposure to chemical and physical hazards in our homes, communities and workplaces through such media as contaminated water, soil and air. Starting with the basic principles on a wide range of toxic agents, this textbook describes how they enter the body, their mechanisms of action once inside, and strategies for diagnosis, prevention and treatment. Topics covered include: General principles of toxicology: pharmacological and toxicological principles underpinning the study of toxicology, risk assessments and mechanisms of cell death Disposition: routes of chemical exposures, entry into the body and various tissues, storage, metabolic biotransformation and elimination, with examples from various toxicants. Toxic agents: the occurrences, disposition in the body, health effects, toxic mechanisms, antidotes and treatments of a range of agents including pesticides, metals, solvents, gases, nanomaterials, food components and additives, pharmaceuticals, drugs of abuse, natural toxins, endocrine disruptors, radiation, and warfare weapons. Toxic effects: including neurotoxicity, developmental toxicity, immunotoxicity, teratogenecity, male and female reproductive toxicity, mutagenecity, carcinogenicity, pulmonary toxicity, cardiovascular toxicity, hepatotoxicity, gastrointestinal toxicity and cardiovascular toxicity Toxicology and society: epidemiological studies of chemical-induced diseases in human populations, and a vision for toxicology in the 21st century. Mammalian Toxicology is an essential primer for students of toxicology, biochemistry, biology, medicine and chemistry. It is also appropriate for professional toxicologists in research or regulatory affairs, and anyone who needs to understand the adverse effects of toxic agents on the human body.

Comprehensive Toxicology

Comprehensive Toxicology
Author:
Publisher: Elsevier
Total Pages: 6448
Release: 2010-06-01
Genre: Medical
ISBN: 0080468845

An explosive increase in the knowledge of the effects of chemical and physical agents on biological systems has led to an increased understanding of normal cellular functions and the consequences of their perturbations. The 14-volume Second Edition of Comprehensive Toxicology has been revised and updated to reflect new advances in toxicology research, including content by some of the leading researchers in the field. It remains the premier resource for toxicologists in academia, medicine, and corporations. Comprehensive Toxicology Second Edition provides a unique organ-systems structure that allows the user to explore the toxic effects of various substances on each human system, aiding in providing diagnoses and proving essential in situations where the toxic substance is unknown but its effects on a system are obvious. Comprehensive Toxicology Second Edition is the most complete and valuable toxicology work available to researchers today. Contents updated and revised to reflect developments in toxicology research Organized with a unique organ-system approach Features full color throughout Available electronically on sciencedirect.com, as well as in a limited-edition print version

Contaminated Water Supplies at Camp Lejeune

Contaminated Water Supplies at Camp Lejeune
Author: National Research Council
Publisher: National Academies Press
Total Pages: 338
Release: 2009-09-06
Genre: Medical
ISBN: 0309136997

In the early 1980s, two water-supply systems on the Marine Corps Base Camp Lejeune in North Carolina were found to be contaminated with the industrial solvents trichloroethylene (TCE) and perchloroethylene (PCE). The water systems were supplied by the Tarawa Terrace and Hadnot Point watertreatment plants, which served enlisted-family housing, barracks for unmarried service personnel, base administrative offices, schools, and recreational areas. The Hadnot Point water system also served the base hospital and an industrial area and supplied water to housing on the Holcomb Boulevard water system (full-time until 1972 and periodically thereafter). This book examines what is known about the contamination of the water supplies at Camp Lejeune and whether the contamination can be linked to any adverse health outcomes in former residents and workers at the base.

Prodrugs

Prodrugs
Author: Valentino Stella
Publisher: Springer Science & Business Media
Total Pages: 1447
Release: 2007-03-12
Genre: Medical
ISBN: 038749782X

These volumes represent a comprehensive guide to prodrugs. They guide the reader through the current status of the prodrug concept and its many applications and highlight its many successes in overcoming formulation and delivery of problematic drugs. Replete with examples of approved and marketed prodrugs, these volumes introduce the topic to the novice as well as professional in the design of prodrugs.