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Effects of Amylin on Eating and Adiposity

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Book cover Appetite Control

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 209))

Abstract

Amylin’s best investigated function is to reduce eating via a meal size effect by promoting meal-ending satiation. This effect seems to depend on an activation of specific area postrema neurons. Brain areas that convey the neural signal to the forebrain include the nucleus of the solitary tract and the lateral parabrachial nucleus. Acute application of amylin modulates the activity of hypothalamic areas involved in the control of eating, namely, the lateral hypothalamic area and possibly the ventromedial hypothalamic nucleus. Amylin also interacts with other satiating signals, such as cholecystokinin, presumably in the brainstem. Interestingly, amylin also exhibits characteristics of adiposity signals; plasma levels of amylin are higher in obese individuals, chronic infusion of amylin into the brain reduces body weight gain and adiposity, and infusion of amylin antagonists increases adiposity. Furthermore, amylin maintains energy expenditure at higher levels than would be expected considering its body weight-lowering effect. However, much less is known (e.g., site of action, signaling pathways, differential activation of brain sites, and, most importantly, physiological relevance) with respect to its role as adiposity signal and regulator of energy expenditure than about its satiating action. Notwithstanding, and perhaps because amylin resistance does not seem to be a general and prohibitive concomitant of obesity, animal data and recent clinical data in humans indicate that amylin is a very promising candidate for the treatment of obesity. Amylin seems to be particularly effective when combined with other hormones such as leptin.

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Acknowledgement

Our work has been financially supported by the Swiss National Science Foundation. The support of the Zurich Center of Integrative Human Physiology, the Novartis Foundation, the Olga Mayenfisch Foundation, the Vontobel Foundation, and the Ciba-Geigy Jubilee Foundation are also gratefully acknowledged.

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  1. Institute of Veterinary Physiology and Zurich Center for Integrative Human Physiology, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland

    Thomas Alexander Lutz

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Correspondence to Thomas Alexander Lutz .

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  1. , Department of Pharmacology, German Institute of Human Nutrition, Arthur-Scheunert-Allee 114-116, Nuthetal, 14558, Germany

    Hans-Georg Joost

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Lutz, T.A. (2012). Effects of Amylin on Eating and Adiposity. In: Joost, HG. (eds) Appetite Control. Handbook of Experimental Pharmacology, vol 209. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24716-3_10

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