title: Effects of administration of Bifidobacterium animalis subsp. lactis GCL2505 on defecation frequency and bifidobacterial microbiota composition in humans.
abstract: The aim of this study was to evaluate the changes in endogenous bifidobacteria and administered Bifidobacterium animalis subsp. lactis (B. lactis) GCL2505 (GCL2505) in the intestine after administration of GCL2505 by means of a randomized, placebo-controlled double-blind, cross-over study. An increase in the number of total bifidobacteria (the sum of B. bifidum, B. breve, B. longum subsp. longum, B. adolescentis, B. anglatum, B. catenulatum, B. pseudocatenulatum, B. dentium, B. longum subsp. infantis and B. lactis) in the feces were observed after administration of GCL2505 using species- and subspecies-specific real-time polymerase chain reaction analysis. However, the number of endogenous bifidobacteria species (excluding B. lactis) remained unchanged. B. lactis also became the predominant bifidobacterial species. Taking into account the number of GCL2505 administered, the findings further suggested that GCL2505 proliferated in the intestine. In addition, the defecation frequency increased during GCL2505 administration compared with the placebo. Moreover, a single administration study (n=17) clearly demonstrated that GCL2505 successfully reached the intestine before proliferating at least 10-fold. This is the first report to show an increase in intestinal bifidobacteria, with no changes to the endogenous species, and improvements in constipation following proliferation of administered bifidobacteria.
authors.affiliation: Glico Dairy Products Co., Ltd., 2-14-1 Musashino, Akishima-shi, Tokyo 196-0021, Japan. ishizuka-akihiro@gd.glico.co.jp
authors.forename: Akihiro
authors.initials: A
authors.lastname: Ishizuka
authors.forename: Kotomi
authors.initials: K
authors.lastname: Tomizuka
authors.forename: Ryo
authors.initials: R
authors.lastname: Aoki
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Nishijima
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Saito
authors.forename: Ryo
authors.initials: R
authors.lastname: Inoue
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ushida
authors.forename: Takashi
authors.initials: T
authors.lastname: Mawatari
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ikeda
mesh_terms: D000328:Adult; D001644:Bifidobacterium / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D044822:Biodiversity; D015169:Colony Count, Microbial; D003248:Constipation / Q000382:microbiology; D018592:Cross-Over Studies; D003672:Defecation; D004311:Double-Blind Method; D005243:Feces / Q000382:microbiology*; D005260:Female; D006801:Humans; D007422:Intestines / Q000382:microbiology; D008297:Male; D054892:Metagenome / Q000235:genetics / Q000502:physiology*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D055815:Young Adult
chemical_list: D012336:RNA, Ribosomal, 16S