title: N-acetylmannosamine improves object recognition and hippocampal cell proliferation in middle-aged mice.
abstract: Sialic acids may modulate cell proliferation and gene expression, particularly in neural cells in vitro. However, the function of sialic acids in the central nervous system has not previously been examined. We examined whether N-acetylmannosamine (ManNAc) could improve object recognition and hippocampal cell proliferations in middle-aged mice. C56BL/6J mice aged 52 weeks were treated with ManNAc for 4 weeks. Their cognitive-ability was assessed with a place and object recognition test. ManNAc, but not N-acetylglucosamine or N-acetylneuraminic acid, improved the index score in the place recognition task at a dosage of 5.0 mg/mL in drinking water. Additionally, ManNAc enhanced the hippocampal cell proliferation, which was evaluated by a bromodeoxyuridine assay and the number of Ki67-immunoreactive cells. We could demonstrate that ManNAc had positive effects on the age-related brain dysfunction. These findings suggest that the use of ManNAc or related compounds may be a new approach for the treatment of human dementia.
authors.affiliation: Companion Animal Research, School of Veterinary Medicine, Azabu University, Kanagawa, Japan. kikusui@azabu-u.ac.jp
authors.forename: Takefumi
authors.initials: T
authors.lastname: Kikusui
authors.forename: Aki
authors.initials: A
authors.lastname: Shimozawa
authors.forename: Aya
authors.initials: A
authors.lastname: Kitagawa
authors.forename: Miho
authors.initials: M
authors.lastname: Nagasawa
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Mogi
authors.forename: Shintaro
authors.initials: S
authors.lastname: Yagi
authors.forename: Kunio
authors.initials: K
authors.lastname: Shiota
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects; D006595:Hexosamines / Q000494:pharmacology*; D006624:Hippocampus / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D055495:Neurogenesis / Q000187:drug effects; D021641:Recognition, Psychology / Q000187:drug effects*
chemical_list: D006595:Hexosamines; C002022:N-acetylmannosamine