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Transgenic study of energy homeostasis equation: implications and confounding influences

Second Department of Internal Medicine, Kobe University School of Medicine, Kobe, Japan

¹Correspondence: Second Department of Internal Medicine, Kobe University School of Medicine, Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. E-mail: inui{at}med.kobe-u.ac.jp

Recently novel molecular mediators and regulatory pathways for feeding and body weight regulation have been identified in the brain and the periphery. Mice lacking or overexpressing these mediators or receptors have been produced by molecular genetic techniques, and observations on mutant mice have shed new light on the role of each element in the homeostatic loop of body weight regulation. However, the interpretation of the phenotype is under the potential influence of developmental compensation and other genetic and environmental confounds. Specific alterations of the mediators and the consequences of the altered expression patterns are reviewed here and discussed in the context of their functions as suggested from conventional pharmacological studies. Advanced gene targeting strategies in which genes can be turned on or off at desired tissues and times would undoubtedly lead to a better understanding of the highly integrated and redundant systems for energy homeostasis equation.—Inui, A. Transgenic study of energy homeostasis equation: implications and confounding influences

Key Words: melanocortin • neuropeptide Y • arcuate nucleus • body mass

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