Abstract
Material with leuckocyte migration inhibition (LMI) activity has been demonstrated in various types of nonimmunologically induced acute pleural inflammatory exudates. This activity is present in inflammatory cell-free exudate and appears to involved the deposition of fibrin around the migrating leukocyte, resulting in "cell-trapping." This is supported by the fact that removal or inhibition of fibrin formation leads to loss of exudate LMI activity. Both fibrinogen and complement as well as vitamin K-dependent clotting factors appear to be required for LMI activity. The mechanism involved in the LMI reaction and its significance in nonimmune and cell-mediated immune inflammation are discussed.
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