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Journal of Dental Research
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Biological

Suppression of Stress-induced nNOS Expression in the Rat Hypothalamus by Biting

N. Hori1, M.-C. Lee2,*, K. Sasaguri3, H. Ishii3, M. Kamei3, K. Kimoto1, M. Toyoda1 and S. Sato3

1 Oral and Maxillofacial Rehabilitation, Division of Prosthetics,
2 Clinical Care Medicine, Division of Pharmacology and ESR Laboratories, and
3 Craniofacial Growth and Development Dentistry, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan;

Correspondence: * corresponding author, ieeman{at}kdcnet.ac.jp

Nitric oxide (•NO) modulates the activity of the endocrine system in the behavioral response to stress. The purpose of this study was to investigate the effect of restraining the body of an animal on expression of neuronal nitric oxide synthase (nNOS) in the paraventricular nucleus (PVN) of the hypothalamus, and the inhibitory effect of para-masticatory activity on restraint-induced nNOS expression. We observed an increase in nNOS mRNA expression and nNOS-positive neurons in the rat hypothalamus after 30 or 60 min of restraint. Biting on a wooden stick during bodily restraint decreased nNOS mRNA expression in the hypothalamus. In addition, the number of nNOS-positive neurons was significantly reduced in the PVN of the hypothalamus. These observations clearly suggest a possible anti-stress effect of the masticatory activity of biting, and this mechanism might be unconsciously in operation during exposure to psychological stressors.

Key Words: neuronal nitric oxide synthase (nNOS) • restraint stress • biting • paraventricular nucleus • rat

Journal of Dental Research, Vol. 84, No. 7, 624-628 (2005)
DOI: 10.1177/154405910508400708
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