Abstract
Obesity-associated diabetes, a major risk factor for numerous disorders including chronic renal, cardiovascular, and cerebrovascular diseases, is a rapidly increasing public health challenge worldwide. Despite several remarkable advances in obesity research over the past decade, the mechanisms underlying obesity are still not fully understood. In recent years it has been revealed that several metabolic interactions between organs and tissues, which are mediated by neuronal networks governed by the brain, function as a negative-feedback mechanism to maintain body weight homeostasis, even when energy intake is excessive. On the other hand, we recently discovered a new inter-organ neural network, from the liver, possibly representing a positive-feedback mechanism. In states of energy intake beyond physiological requirements, glucose metabolism changes in the liver with increased hepatic glucokinase expression and the induction of neuronal signal transmissions via the afferent vagal nerve. These signals, received by the medulla, result in inactivation of sympathetic innervation of brown adipose tissue (BAT). This leads to suppression of thermogenesis in BAT and thereby favors obesity development. This review focuses on the neuronal network mediating the inter-organ communication necessary for glucose and energy metabolism.
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Acknowledgments
Parts of this review were presented as the Lilly Award Lecture at the Japan Diabetes Society 2013, Kumamoto, Japan. The author thanks Professors Hideki Katagiri and Yoshitomo Oka for their instruction and invaluable support. The significant contributions of colleagues and collaborators, especially Drs Yasushi Ishigaki, Kenji Uno, and Sohei Tsukita, are also deeply appreciated. The studies cited in this review were supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology and a Core Research for Evolutional Science and Technology grant from the Japan Science and Technology Agency.
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Yamada, T. Inter-organ communications mediate crosstalk between glucose and energy metabolism. Diabetol Int 4, 149–155 (2013). https://doi.org/10.1007/s13340-013-0133-z
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DOI: https://doi.org/10.1007/s13340-013-0133-z