Flow cytometric assay of phagocytic activity of human neutrophils and monocytes in whole blood by neutral red uptake

P. Antal, S. Sipka, P. Surányi, I. Csipo, T. Seres, L. Maródi, G. Szegedi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In a new, simple, and fast flow-cytometric method for the simultaneous measurement of phagocytic activity of human neutrophils and monocytes in whole blood, the fluorescence capability of the well-known vital stain, neutral red was used. The incubation of 0.5 ml heparinized human blood with the phagocytic stimulus of zymosan dose- and time-dependently increased the percentage and the red fluorescence intensity of both neutrophils (4.3±1.2 times) and monocytes (2.7±0.7 times) measured cytofluorimetrically. Decreased uptake of neutral red was observed in a patient with phagocytic disorder, based upon impaired engulfment of particles and production of reactive oxygen species. In a patient with chronic granulomatosis, however, no decrease of neutral red uptake was measured. Platelet activating factor and phorbol myristate acetate were also able to increase the uptake of neutral red by both monocytes and neutrophils, but to a lesser extent than zymosan. The advantage of this method is the possibility for the simultaneous measurement of phagocytic activities of monocytes and neutrophils stimulated by either particles or soluble activators. This method is suitable for the selective measurement of activation processes not related to the production of free radicals in the phagocytes.

Original languageEnglish
Pages (from-to)259-265
Number of pages7
JournalAnnals of Hematology
Volume70
Issue number5
DOIs
Publication statusPublished - May 1 1995

Keywords

  • Flow cytometry
  • Monocytes
  • Neutral red
  • Neutrophils
  • Phagocytosis

ASJC Scopus subject areas

  • Hematology

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