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Inhibitory Effects of Areca Nut Extract on Expression of Complement Receptors and Fc Receptors in Human Neutrophils
Author(s) -
Lee YaYun,
Lin MingBin,
Cheng ChiFang,
Chang LienYu,
Liu TsungYun,
Hung ShanLing
Publication year - 2014
Publication title -
journal of periodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.036
H-Index - 156
eISSN - 1943-3670
pISSN - 0022-3492
DOI - 10.1902/jop.2013.130498
Subject(s) - opsonin , receptor , phagocytosis , complement receptor , flow cytometry , complement system , receptor expression , chemistry , biology , microbiology and biotechnology , antibody , immunology , biochemistry
Background: Chewing of areca quid increases the prevalence of periodontal diseases. Areca nut extract (ANE) inhibits the phagocytic activity of human neutrophils. This in vitro study investigates the effects of ANE on complement‐ and antibody‐opsonized phagocytosis by neutrophils. Expression of complement receptors, Fc receptors, and F‐actin in ANE‐treated neutrophils is also analyzed. Methods: The viability of ANE‐treated neutrophils was determined using the propidium iodide staining method. The possible effects of ANE on the expression of complement receptors and Fc receptors were examined using an immunofluorescence staining method followed by flow cytometry and confocal laser scanning microscopy. The phagocytic activity of neutrophils against complement or immunoglobulin (Ig)G‐opsonized fluorescent beads was analyzed using flow cytometry. Expression of F‐actin was determined using confocal laser scanning microscopy. Results: ANE significantly inhibited the production of complement receptors (CR1, CR3, and CR4) and Fc receptors (FcγRII and FcγRIII) in a concentration‐dependent manner. Treatment of neutrophils with ANE significantly impaired their ability to phagocytose fluorescent beads. ANE also inhibited phagocytosis of fluorescent beads that were opsonized by complement or IgG. Moreover, expression of F‐actin was inhibited after ANE treatment. Conclusions: ANE inhibits the complement‐ and IgG‐mediated neutrophil phagocytosis that may result from reduction of the expression of complement receptors, Fc receptors, and F‐actin formation after ANE treatment. The findings suggest that areca nut chewing may jeopardize the defensive functions of neutrophils and affect periodontal health.