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Pre-Adolescent Diet Normalization Restores Cognitive Function in Young Mice.

Wenqian Sun1, Hidemasa Okihara1, Takuya Ogawa1

  • 1Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 1138510, Japan.

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Summary
This summary is machine-generated.

Restoring mastication by switching to a harder diet before adolescence significantly improves cognitive function in mice. However, delaying this dietary change impairs learning and memory, underscoring the critical window for masticatory development.

Keywords:
cognitive dysfunctiongrowth and developmenthippocampusmasticationrecovery

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Nutritional Science

Background:

  • Mastication is crucial for central nervous system (CNS) development and function.
  • Poor masticatory performance is linked to cognitive dysfunction in children and adults.
  • The critical developmental period for mastication's impact on cognitive function remains unclear.

Purpose of the Study:

  • To investigate the impact of restored mastication on learning and memory in a mouse model.
  • To determine the critical time window during which masticatory function influences cognitive development.

Main Methods:

  • Development of a mouse model with diet texture manipulation (soft to normal diet) at different time points.
  • Behavioral tests to assess learning and memory.
  • Micro-CT, histological, and biochemical analyses of orofacial structures and hippocampal function.

Main Results:

  • Early diet correction (before adolescence) restored mastication and cognitive function, enhancing neurogenesis and key signaling pathways (ERK, CREB, BDNF).
  • Late diet correction (post-adolescence) failed to fully restore mastication, resulting in impaired cognitive function, neuronal loss, and reduced hippocampal neurogenesis.
  • A critical developmental window exists between juvenile and adolescent periods for mastication's influence on cognitive function.

Conclusions:

  • Adequate food texture and early intervention are vital for preventing mastication-related cognitive impairment in children.
  • Masticatory function is functionally linked to cognitive function during the juvenile to adolescent period in mice.
  • Restoring mastication through appropriate diet texture can positively impact neurodevelopment and cognitive outcomes.