Azuma Kagaku
   Department   School of Medicine  Anatomy(1), Biomedical Sciences
Article types review
Language English
Peer review Peer reviewed
Title Association between Mastication, the Hippocampus, and the HPA Axis: A Comprehensive Review.
Journal Formal name:International journal of molecular sciences
Abbreviation:Int J Mol Sci
ISSN code:14220067/14220067
Domestic / ForeginForegin
Volume, Issue, Page 18(8),1687頁
Author and coauthor Azuma Kagaku, Zhou Qian, Niwa Masami, Kubo Kin-Ya
Publication date 2017/08
Summary Mastication is mainly involved in food intake and nutrient digestion with the aid of teeth. Mastication is also important for preserving and promoting general health, including hippocampus-dependent cognition. Both animal and human studies indicate that mastication influences hippocampal functions through the end product of the hypothalamic-pituitary-adrenal (HPA) axis, glucocorticoid (GC). Epidemiologic studies suggest that masticatory dysfunction in aged individuals, such as that resulting from tooth loss and periodontitis, acting as a source of chronic stress, activates the HPA axis, leading to increases in circulating GCs and eventually inducing various physical and psychological diseases, such as cognitive impairment, cardiovascular disorders, and osteoporosis. Recent studies demonstrated that masticatory stimulation or chewing during stressful conditions suppresses the hyperactivity of the HPA axis via GCs and GC receptors within the hippocampus, and ameliorates chronic stress-induced hippocampus-dependent cognitive deficits. Here, we provide a comprehensive overview of current research regarding the association between mastication, the hippocampus, and HPA axis activity. We also discuss several potential molecular mechanisms involved in the interactions between mastication, hippocampal function, and HPA axis activity.
DOI 10.3390/ijms18081687
PMID 28771175