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• W2022309557 endingPage "340" @default.
• W2022309557 startingPage "313" @default.
• W2022309557 abstract "Endotoxins have been recognized for more than a century as microbial constituents capable of eliciting deleterious pathophysiologic responses when administered to experimental laboratory animals. Within the last several decades, evidence in support of the concept that endotoxins can serve as proinflammatory mediators in humans has derived primarily from studies carried out in healthy human volunteers using highly purified and well-characterized endotoxic lipopolysaccharides from Escherichia coli.10 Of considerable interest in this respect, however, is the finding that there is not at the present time strong and unequivocal evidence that would unambiguously support bacterial endotoxin as being among the dominant microbial factors that contributes substantially to morbidity and mortality in the septic patient.63 Nevertheless, there is still sufficiently strong evidence from many sources to allow the conclusion that endotoxin is of considerable importance in sepsis, and it merits study to understand exactly how it contributes to the disease process. Since the earliest days of endotoxin research, investigators have sought the answer to the question of the relationship between the structure of the endotoxin molecule and its function as a microbial toxin. From the very earliest studies, pioneered in large part by Andre Boivin, the Mesrobeanus, Walter Morgan, and others, it was recognized that endotoxin is indeed a complex chemical entity, consisting of protein, lipid, and carbohydrate.89 Experiments first carried out by the cancer researchers, Shear and his colleagues,33 to test experimentally the concept that the endotoxin-containing mixed microbial toxins employed by William Coley to treat inoperable sarcomas were, in fact, endotoxin, first described these molecules as complex lipopolysaccharides (LPS). Strong support for this conclusion was provided by studies that allowed the conclusion that LPS was, in fact, identical to the O-antigen first described by Weil and Felix in 1917.114 The seminal studies of Luderitz and Westphal in the 1950s provided the first insights into detailed structure-function relationships of endotoxic LPS when they demonstrated that heating of highly purified LPS with mild acid resulted in the generation of an insoluble lipid-enriched residue that they called lipid A (to distinguish it from the more readily removable lipids, termed lipid B, also present in the preparations). By the late 1950s and early 1960s, the evidence was reasonably strong (but not without question) that the lipid component (and more precisely the lipid A) was the toxic component of endotoxin responsible for the lethal activity of endotoxin in experimental laboratory animals. Mounting evidence to further substantiate this claim derived from studies involving a diverse spectrum of experimental approaches, including (1) the isolation and characterization of the so-called deep rough Salmonella minnesota strain of bacteria70, 71; (2) chemical treatment with mild alkali to modify selectively lipid A fatty acids85; (3) experiments carried out in the presence of polymyxin B, an agent shown to bind exclusively to the lipid A region of LPS64; and (4) more comprehensive in vivo and in vitro studies comparing highly purified lipid A with intact LPS.11 The final proof of the importance of lipid A awaited the precise determination of its chemical structure and subsequent complete chemical synthesis, the latter of which was finally achieved and published in the early 1980s by Tetsuo Shiba and his colleagues in Japan.106 It is now universally recognized that bacterial endotoxins are complex chemical structures. The active component of endotoxin is the O-antigen–containing LPS structure. Within the LPS molecule, it is the common highly conserved lipid A domain that actually constitutes the toxic principle of endotoxin. Chemically synthesized polysaccharide-free preparations of lipid A will manifest biologic activities both in vitro and in vivo that are superimposible with those obtained using preparations of highly purified lipid A from natural microbial sources. In spite of the now generally universally accepted concept that the toxic and inflammatory manifestations of endotoxin reside in the lipid A region, it is nevertheless important to appreciate that there exist credible data that would support the concept that other components of the endotoxin complex are also capable of eliciting host responses. These responses would be in addition to their ability to stimulate the host immune system in the induction of specific antibody. In this respect, there is evidence that the polysaccharide component of LPS (including both core oligosaccharide and O-antigen) can have biologic activity independent of lipid A. In addition, other microbial constituents that often associate with LPS during the isolation and purification process, primarily protein, can interact with host cells to produce inflammatory mediators, and such contributions should not be ignored, particularly when considering the pathophysiologic role of endotoxin in the septic patient." @default.
• W2022309557 created "2016-06-24" @default.
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• W2022309557 date "1999-06-01" @default.
• W2022309557 modified "2023-10-17" @default.
• W2022309557 title "STRUCTURE-FUNCTION RELATIONSHIPS OF BACTERIAL ENDOTOXINS" @default.
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