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Journal Article
Review
The immune system and the effects of non-volatile anesthetics on neutrophil transmigration through endothelial cell monolayers.
Current Pharmaceutical Design 1999 December
Inflammation represents the consequence of capillary dilation with accumulation of fluid and transmigration of leukocytes into the surrounding tissue. Leukocytes play a major role in the defense system of the body against invading microorganisms. This defense system has a non-specific branch consisting of granulocytes and macrophages and a specific branch of lymphocytes. Granulocytes release cytotoxic compounds from their intracellular granules into their local environment when encountering microorganisms. This random destruction happens rapidly, but it may also harm healthy tissue of the body. Leukocytes patrol the body by circulating through the blood and lymphatic system ensuring a continuous surveillance which is a prerequisite for an efficient defense. Upon tissue damage and inflammation, leukocytes are recruited from the blood to sites of injury, and this trafficking displays exquisite specificity. In the late 1890 s, Metchnikoff noted the power of certain blood cells to move towards microorganisms and ingest them. In fact, leukocytes adhere to the endothelium of the blood vessels, and subsequently leave the circulation by transmigration through the intercellular junctions of the endothelial cell monolayer. Transmigration is driven by chemoattractants, a process known as diapedesis. Reversible adherence of leukocytes to the endothelium, basement membranes, and other surfaces is an essential event in the establishment of inflammation, whose molecular basis is beginning to be understood. Inflammation may become chronic in many pathophysiologic processes and disease states. In long-term mechanically ventilated critically ill patients, non-volatile anesthetics are needed over a prolonged time period. Perioperative infections are a major cause of morbidity and mortality in critically ill patients. Therefore, the influence of non-volatile anesthetics and opioid agents on the immune system is of high interest. After presentation of the different effectors of the immune system and their fluxes through the body, the aim of this review is to propose a general model of leukocyte transmigration through endothelial cell monolayers. It emphasizes in which way different non-volatile anesthetic drugs may affect the non-specific branch of the immune system, i.e. the leukocyte transmigration through endothelial cell monolayers.
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