Influence of central nervous system on masticate dysfunction from childhood of SAM mice

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To investigate the influence of masticatory dysfunction(tube feeding) on the hippocampus, it was conducted an experiment using juvenile (15-week-old after birth) and elderly (35-week-old after birth) Senessence accererated mice (SAMP1). As a behavioral investigation, Morris' water maze test was conducted from 8 days after cube feeding were started. As morphological investigations, the numbers of fos-positive cell, which were linked to the water maze test in the hippocampus, neurons cell and pyramidal cell in the hippocampus were measured after Morris' water maze test.As results in elderly mice acclimated by tube feeding, spatial recognition was reduced, and the number of fos-positive cells, neurons cells and pyramidal cells in the hippocampus was decreased, but not in the juvenile mice.The results of these animal experiments suggest that masticatory dysfunction (tube feeding) decreases information input into the hippocampus, reducing spatial recognition and accelerating the process of aging.