Journal
AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL
Volume 185, Issue -, Pages 29-35Publisher
ELSEVIER
DOI: 10.1016/j.autneu.2014.06.005
Keywords
Autonomic neurotransmission; Sympathetic; Parasympathetic; Limonene; Linalool; Circadian clock; Suprachiasmatic nucleus; Histamine; Rat; Mice; Aromatherapy; White adipose tissue; Brown adipose tissue; Adrenal glands; Kidney; Stomach; Lipolysis; Thermogenesis; Body temperature; Blood pressure; Appetite
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This review summarizes the effects of olfactory stimulation with grapefruit and lavender oils on autonomic nerve activity and physiological function. Olfactory stimulation with the scent of grapefruit oil (GFO) increases the activity of sympathetic nerves that innervate white and brown adipose tissues, the adrenal glands, and the kidneys, decreases the activity of the gastric vagal nerve in rats and mice. This results in an increase in lipolysis, thermogenesis, and blood pressure, and a decrease in food intake. Olfactory stimulation with the scent of lavender oil (LVO) elicits the opposite changes in nerve activity and physiological variables. Olfactory stimulation with scent of limonene, a component of GFO, and linalool, a component of LVO, has similar effects to stimulation with GFO and LVO, respectively. The histamine HI-receptor antagonist, diphenhydramine, abolishes all GPO-induced changes in nerve activity and physiological variables, and the hitstamine H3-receptor antagonist, thioperamide, eliminates all LVO-induced changes. Lesions to the hypothalamic suprachiasmatic nucleus and anosmic treatment with ZnSO4 also abolish all GFO- and LVO-induced changes. These findings indicate that limonene and linalool might be the active substances in GFO and LVO, and suggest that the suprachiasmatic nucleus and histamine are involved in mediating the GFO- and LVO-induced changes in nerve activity and physiological variables. (C) 2014 Elsevier B.V. All rights reserved.
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