Summary
Neutral proteases can be released from PMN neutrophils in blood smears from healthy subjects by incubation with NaCl-borate buffer. The activity of the PMN proteases can be revealed by the degradation of erythrocytes and plasma within ring-shaped areas centered around each neutrophil (halo effect). During the acute stage of various inflammatory diseases (pneumonia, meningitis, cholecystitis, etc.) the activity of neutral PMN proteases is substantially reduced, as reflected by reduced halo formation. After recovery, halo formation returns to normal. Temporary lowering of neutral PMN proteases is thus one of a series of functional defects of PMN neutrophils which are detectable in the course of acute infectious diseases. These include reduced phagocytosis, altered chemotaxis and reduced bactericidal function. The cytochemical test for neutrophilic granulocyte function used in the present investigation is especially practical by comparison with the other techniques: it saves time and is simple to perform.
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Dedicated to Prof. W. Graumann on the occasion of his 65th birthday
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Klessen, C., Tekolf, W. Cytochemical investigation of neutral proteases in polymorphonuclear (PMN) neutrophils in acute inflammatory diseases. Histochemistry 69, 307–314 (1980). https://doi.org/10.1007/BF00489776
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DOI: https://doi.org/10.1007/BF00489776