Immunosuppression involves an act that reduces the activation or efficacy of the immune system. Some portions of the immune system itself have immuno-suppressive effects on other parts of the immune system, and immunosuppression may occur as an adverse reaction to treatment of other conditions. Deliberately induced immunosuppression is generally done to prevent the body from rejecting an organ transplant, treating graft-versus-host disease after a bone marrow transplant, or for the treatment of auto-immune diseases such as rheumatoid arthritis or Crohn's disease. This is typically done using drugs, but may involve surgery (splenectomy), plasmapharesis, or radiation. A person who is undergoing immunosuppression, or whose immune system is weak for other reasons (for example, chemotherapy and HIV patients) is said to be immunocompromised. When an organ is transplanted, the immune system of the recipient will most likely recognise it as foreign tissue and attack it. The destruction of the organ will, if untreated, end in the death of the recipient. In the past, radiation therapy was used to decrease the strength of the immune system, but now immunosuppressant drugs are used to inhibit the reaction of the immune system. The downside is that with such a deactivated immune system, the body is very vulnerable to opportunistic infections, even those usually considered harmless. Also, prolonged use of immunosuppressants increases the risk of cancer. This book presents the latest research in the field.

In recent decades immunology has been one of the most exciting--and successful--fields of biomedical research. Over the past thirty years immunologists have acquired a detailed understanding of the immune system's unique recognition mechanism and of the cellular and chemical means used to destroy or neutralize invading organisms. This understanding has been formulated in terms of the clonal selection theory, the dominant explanation of immune behavior. That story is the subject of "The Generation of Diversity,"

A major problem for immunologists had long been to determine how cells of the immune system could produce millions of distinct antibodies--and produce them on demand. The clonal selection theory explains that cells with genetic instructions to produce each antibody exist in the body in small numbers until exposure to the right molecule--the antigen--triggers the selective cloning that will reproduce exactly the cell needed. But how can so many different antibody-producing cells be generated from such limited genetic material? The solution to this question came from new applications of molecular biology, and, as the authors argue, the impact of the new techniques changed both the methods and the concepts of immunology.

"The Generation of Diversity" is an intellectual history of the major theoretical problem in immunology and its resolution in the post-World War II period. It will provide for immunologists essential background for understanding the conceptual conflicts occurring in the field today.

Monoclonal antibodies have had their impact on biomedical research for more than a decade. Beside their exuberant use as reagents, quite a number of diagnostic and therapeutic approaches have been followed and an impressive number of technological improvements, e.g., humanization, recombinant miniantibodies, have been elaborated to strengthen the principle. With respect to clinical applications, the first generation of antibody 'drugs' is yielding promising results while second and third generation antibody constructs are already underway. The book reviews the status of technological development and brings this into the perspective of clinical results. A rapidly growing amount of clinical data is collected in an expanding number of indications. Hence, the review of clinical study results has been grouped according to the fields of oncology and of chronic and acute inflammation. This book will be of interest to scientists working in the fields of oncology, immunology, internal medicine and clinical chemistry.

This book presents a wide variety of immuno-gold techniques for use in virus diagnosis and research. Protocols are presented for state-of-the-art techniques, including in situ hybridization, freeze substitution, and the utilization of ultra-small probes and replicas for use by virologists and electron microscopists identifying and studying viruses, their components, and replication in cells. The procedures are described by eminent scientists and are pertinent to both experienced researchers and newcomers to this field who are interested in the localization of low antigenic mass structures.