Delayed phagocytosis and bacterial killing in Chediak-Higashi syndrome neutrophils detected by a fluorochrome assay: ultrastructural aspects

Memórias do Instituto Oswaldo Cruz

Raquel Bellinati-pires¹  Maristela M. Salgado²  Paulo P. Joazeiro¹  Magda M. S. Carneiro-sampaio¹ 

[1] ,Instituto Adolfo Lutz Seção de Imunologia São Paulo,Brasil

关键词: neutrophils;    Chediak;    Higashi syndrome;    phagocytosis;    bacterial killing;   

DOI  :  10.1590/S0074-02761992000400018

来源: SciELO

【 摘 要 】

The few studies already published about phagocyte functions in Chediak-Higashi syndrome (CHS) has stated that neutrophils present slow rate of bacterial killing but normally ingest microorganisms. In the present study, both phagocytosis and killing of Staphylococcus aureus were verified to be in neutrophils from two patients with CHS when these functions were simultaneously evaluated by a fluorochrome phagocytosis assay. Electron microscopic examination showed morphologic differences among neutophils from CHS patients and normal neutrophils regarding the cytoplasmic structures and the aspects of the phagolysosomes. It was noteworthy the presence of giant phagolysosomes enclosing bacteria in active proliferation commonly observed in CHS neutrophils after 45 min of phagocytosis, wich corresponded with the impaired bactericidal activity of these leukocytes. The present results suggest that phagocytosis may also be defective in CHS, and point out to the sensitivity of the fluorochrome phagocytosis assay and its application in clinical laboratories.

【 授权许可】

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