Elsevier

Nutrition

Volume 13, Issue 5, May 1997, Pages 403-411
Nutrition

Current concepts in clinical nutrition
Hypothalamic neuronal histamine: Implications of its homeostatic control of energy metabolism

https://doi.org/10.1016/S0899-9007(97)91277-6Get rights and content

Abstract

In a series of studies on histaminergic functions in the hypothalamus, probes to manipulate activities of histaminergic neuron systems were applied to assess its physiologic and pathophysiologic implications using non-obese normal and Zucker obese rats, an animal model of genetic obesity. Food intake is suppressed by either activation of H1-receptor or inhibition of the H3-receptor in the ventromedial hypothalamus (VMH) or the paraventricular nucleus, each of which is involved in satiety regulation. Histamine neurons in the mesencephalic trigeminal sensory nucleus modulate masticatory functions, particularly eating speed through the mesencephalic trigeminal motor nucleus, and activation of the histamine neurons in the VMH suppress intake volume of feeding at meals. Energy deficiency in the brain, i.e., intraneuronal glucoprivation, activates neuronal histamine in the hypothalamus. Such low energy intake in turn accelerates glycogenolysis in the astrocytes to prevent the brain from energy deficit. Thus, both mastication and low energy intake act as afferent signals for activation of histaminergic nerve systems in the hypothalamus and result in enhancement of satiation. There is a rationale for efficacy of a very-low-calorie conventional Japanese diet as a therapeutic tool for weight reduction. Feeding circadian rhythm is modulated by manipulation of hypothalamic histamine neurons. Hypothalamic histamine neurons are activated by an increase in ambient temperature. Hypothalamic neuronal histamine controls adaptive behavior including a decrease in food intake and ambulation, and an increase in water intake to maintain body temperature to be normally constant. In addition, interleukin-1β, an endogenous pyrogen, enhanced turnover of neuronal histamine through prostaglandin E2 in the brain. Taken together, the histamine neuron system in the hypothalamus is essential for maintenance of thermoregulation through the direct and indirect control of adaptive behavior. Behavioral and metabolic abnormalities of obese Zucker rats including hyperphagia, disruption of feeding circadian rhythm, hyperlipidemia, hyperinsulinemia, and disturbance of thermoregulation are essentially derived from a defect in hypothalamic neuronal histamine. Abnormalities produced by depletion of neuronal histamine from the hypothalamus in normal rats mimick those of obese Zuckers. Grafting the lean Zucker fetal hypothalamus into the obese Zucker pups attenuates those abnormalities. These findings indicate that histamine nerve systems in the brain play a crucial role in maintaining homeostatic energy balance.

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  • Cited by (0)

    Supported partly by Grants-in-Aid 62591025, 02454129, 06454342, 06670731, and 07457225 from the Japanese Ministry of Education, Science and Culture, and by Research Grants from the Japanese Ministry of Health and Welfare, 1989–1996.

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