title: Cationic Lipid Content in Liposome-Encapsulated Nisin Improves Sustainable Bactericidal Activity against Streptococcus mutans.
abstract: An oral infectious disease, dental caries, is caused by the cariogenic streptococci Streptococcus mutans. The expected preventive efficiency for prophylactics against dental caries is not yet completely observed. Nisin, a bacteriocin, has been demonstrated to be microbicidal against S. mutans, and liposome-encapsulated nisin improves preventive features that may be exploited for human oral health. Here we examined the bactericidal effect of charged lipids on nisin-loaded liposomes against S. mutans and inhibitory efficiency for insoluble glucan synthesis by the streptococci for prevention of dental caries. Cationic liposome, nisin-loaded dipalmitoylphosphatidylcholine/phytosphingosine, exhibited higher bactericidal activities than those of electroneutral liposome and anionic liposome. Bactericidal efficiency of the cationic liposome revealed that the vesicles exhibited sustained inhibition of glucan synthesis and the lowest rate of release of nisin from the vesicles. The optimizing ability of cationic liposome-encapsulated nisin that exploit the sustained preventive features of an anti-streptococcal strategy may improve prevention of dental caries.
authors: Department of Preventive Medicine and Public Health, National Defense Medical College,Tokorozawa, Japan.
authors: Kazuo
authors: K
authors: Yamakami
authors: Department of Chemistry, National Defense Medical College, Tokorozawa, Japan.
authors: Hideaki
authors: H
authors: Tsumori
authors: Department of Applied Biochemistry, Tokai University, Hiratsuka, Japan.
authors: Yoshitaka
authors: Y
authors: Shimizu
authors: Department of Preventive Medicine and Public Health, National Defense Medical College,Tokorozawa, Japan.
authors: Yutaka
authors: Y
authors: Sakurai
authors: Eco Friendly Institute Ltd., Fukuoka, Japan.
authors: Kohei
authors: K
authors: Nagatoshi
authors: Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Fukuoka, Japan.
authors: Kenji
authors: K
authors: Sonomoto
keywords: Cationic liposome; Dental caries; Insoluble glucan; MIC; Nisin; Streptococcus mutans