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Minireview: Circadian Control of Metabolism by the Suprachiasmatic Nuclei

Netherlands Institute for Neuroscience (A.K., F.K.), 1105 BA Amsterdam, The Netherlands; Department of Endocrinology and Metabolism (E.F., H.P.S.), Academic Medical Center of the University of Amsterdam, 1105 AZ Amsterdam, The Netherlands; Department of Endocrinology and Metabolism (J.A.R.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands; and Instituto de Investigaciones Biomedicas (R.M.B.), Universidad Autonoma Mexico, Apartado Postal 70228, Ciudad Universitaria, 04510 Mexico D.F.

Address all correspondence and requests for reprints to: Andries Kalsbeek, Netherlands Institute for Neuroscience, Hypothalamic Integration Mechanisms, Meibergdreef 47, 1105 BA Amsterdam, The Netherlands. E-mail: a.kalsbeek{at}nin.knaw.nl.

In the present review, first we present the anatomical connections used by the mammalian biological clock to enforce its endogenous rhythmicity on the rest of the body, especially the energy homeostatic systems. Subsequently, we present a number of physiological experiments investigating the functional significance of this neuroanatomical substrate. Together, this overview of experimental data, for a major part derived from our own experiments, reveals a highly specialized organization of connections between the endogenous pacemaker and both the presympathetic and pre-parasympathetic hypothalamic systems, providing the biological clock with a unique opportunity to modulate the balance of sympathetic/parasympathetic inputs to peripheral organs. We hypothesize that a well-balanced autonomic nervous input, differentiated according to the time of day and the body compartment, is an important companion to withstand the progressive burden of the current 24/7 society on our health and well-being.

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				I. N. Karatsoreos and R. Silver Minireview: The Neuroendocrinology of the Suprachiasmatic Nucleus as a Conductor of Body Time in Mammals Endocrinology, December 1, 2007; 148(12): 5640 - 5647. [Abstract] [Full Text] [PDF]