Yokoyama K, Sugano N, Rahman AK, Oshikawa M, Ito K.
Oral Microbiol Immunol. 2007 Oct;22(5):352-5.
Nihon University Graduate School of Dentistry, Tokyo, Japan.
INTRODUCTION: We investigated the effect of anti-Porphyromonas gingivalis egg yolk antibody against gingipains [immunoglobulin Y (IgY)-GP] on gingipain activity in vitro. METHODS: IgY-GP was isolated from the yolks of White Leghorn hens immunized with purified gingipains. Control antibody (IgY) was isolated from the yolks of non-immunized hens. Gingipain activity was assessed according to the rate of enzymatic substrate hydrolysis. Human epithelial cells were cultured with or without gingipains and with gingipains pretreated with either IgY-GP or IgY. RESULTS: Hydrolytic activity decreased in the presence of IgY-GP. Cells incubated with gingipains showed a dose-dependent loss of adhesion activity. Pretreatment of gingipains with IgY-GP was associated with strong inhibition of cell detachment, whereas pretreatment with IgY was not. CONCLUSION: Our findings suggest that IgY-GP may be an effective immunotherapeutic agent in the treatment of periodontitis.