Studies on the Immunobiology of Trypanosoma Lewisi Infections in Rats


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"The immunological responses in hosts infected with Trypanosoma lewisi were examined during the course of infection and after recovery. Peak antibody levels coincided with the time of parasite elimination, but remained significantly elevated for over one year after the end of the infection The antigen repertoire recognized by antibodies demonstrated that some were revealed only by sera taken during the infection, and other antigens were revealed for the first time only by post-recovery sera. Immunomodulatory protective and suppressive factors were demonstrated in the plasma of irradiated, infected rats. These factors were identified as parasite-derived exoantigens which are shed in vivo and in vitro; exoantigens are complexes of proteins, lipids and polysaccharides and are membrane-surface coat associated, as shown by phase-partitioning and surface-labeling studies. The suppressive activity of the exoantigens was dose-dependent, probably mediated by a suppressor substance(s) produced by macrophages that subsequently inhibits production of interleukin 2 by T helper cells." --




Research Awards Index


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Immunobiology of Parasites and Parasitic Infections


Book Description

The phenomena involved in infections of man and domestic animals with metazoan or protozoan parasites present formidable practical problems as well as a theoretical challenge to immunologists, molecular biologists, and evolu tionary biologists. With respect to the public health and economic problems, malaria, for example, remains a major health problem with approximately 200 million people being infected yearly and, on the basis of World Health Organiza tion estimates, more than 1 million children die each year of malaria infections (Chapter 4). This volume addresses state-of-the-art immunologic approaches to the development of vaccines for parasitic diseases (Chapter 9) and analyses of studies bearing on the antigenic characterization of protozoan and metazoan parasites (Chapters 4, 5, and 7), on investigations of the role of precise mecha nisms underlying natural resistance or non permissiveness of the host to parasitic infections (Chapters 1, 2, and 12), on induced mechanisms including the genera tion of parasite-specific T-cell lines and clones (Chapter 6), and on the generation of monoclonal antibodies (Chapters 4 and 5) to parasite antigens of distinct de velopmental stages. Great progress has been made in characterizing parasite antigens capable of inducing a protective response in the vaccinated host; further progress in this area strongly depends on biochemistry and molecular biology with the long-term goal of synthesizing such antigens chemically or producing them by means of recombinant DNA technology (Chapter 4).




Research Grants Index


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Complement Infectious Diseases


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This monograph has been written with the notion that it may be read by complementologists relatively untrained in microbiology and infectious diseases and by microbiologists and infectious diseases specialists relatively untrained in complementology. Thus, abbreviations are used sparingly and jargon has hopefully been minimized. Furthermore, I have attempted to offer general background information where it seemed relevant or helpful.