Molarless-induced changes of spines in hippocampal region of SAMP8 mice.

Department of Oral Anatomy, Division of Oral Structure, Function and Development, Asahi University School of Dentistry, 1851 Hozumi, Mizuho, Gifu 501-0296, Japan.
Brain Research (Impact Factor: 2.83). 10/2005; 1057(1-2):191-5. DOI: 10.1016/j.brainres.2005.07.038
Source: PubMed

ABSTRACT We examined the effect of the molarless condition on the dendritic spines of hippocampal pyramidal cells in SAMP8 mice in comparison to its effect on learning ability in a maze test. The molarless condition caused a decrease in the number of the spines of CA1 pyramidal cells only in the aged mice showing a reduced learning ability. The results suggest the involvement of the molarless condition in an attenuation of input activities in the hippocampal synapses.