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Sequential changes in mucosal immunity after hemorrhagic shock.
American Surgeon 2001 August
Immunoinflammatory responses after shock and major trauma are characterized by an early hyperinflammatory response and later by compensatory anti-inflammatory host mediator production. This late phase is associated with depressed immune function that has been causally linked with post-traumatic infectious complications and late organ failure. Gut barrier failure is noted in this setting and may be an important source of nosocomial infections and organ failure. Secretory immunoglobulin A (sIgA) is the predominant immunoglobin at mucosal surfaces and is difficult to quantify in luminal secretions. Attempts to normalize sIgA concentrations may not be accurate and/or may not be applicable in vivo. A method using mucosal immunization with cholera toxin (ChT) to normalize gut sIgA levels was used to assess serial changes in sIgA after hemorrhagic shock (HS) in rodents. Total and anti-ChT sIgA levels were highly variable in both HS and sham animals. However, when normalized using the specific anti-ChT/total sIgA ratio, differences were clearly evident. This ratio was depressed between 3 and 10 days post-HS. The specific anti-ChT/total sIgA ratio is a reliable index of secretory antibody at gut luminal surfaces. Impaired mucosal immune function occurred in a time frame consistent with development of late nosocomial infections. This may be important mechanistically in the development of these infectious complications.
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