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American Zoologist 1998 38(2):350-368; doi:10.1093/icb/38.2.350
© 1998 by The Society for Integrative and Comparative Biology
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Regulation of Metamorphosis-Associated Changes in the Lipid Metabolism of Selected Vertebrates1

MARK. A. SHERIDAN2 and YUNG-HSI KAO3
Department of Zoology and Regulatory Biosciences Center, North Dakota State University Fargo, North Dakota 58105

Correspondence: 2 E-mail: msherida{at}plains.nodak.edu

SYNOPSIS. The life histories of many vertebrates include complex, postembryonic developmental pathways that involve morphological and physiological changes that adapt juveniles to a new habitat. A survey of such developmental pathways, including lamprey metamorphosis, salmonid smoltification, and anuran metamorphosis, reveals a common strategy of lipid metabolism consisting of two distinct phases. The first phase is characterized by lipid accumulation in storage sites and resultsfrom lipogenesis prevailing over lipolysis. The second phase is characterized by lipid depletion from storage sites and results from lipolysis prevailing over lipogenesis. Regulation of lipid deposition and lipid mobilization is essential for ensuring availability of lipid during times of need. Lipogenesis is promoted by insulin and, in lamprey and anurans, also by thyroid hormones. Lipolysis is promoted by a number of hormones, including prolactin, growth hormone, adrenocorticotropic hormone, corticosteroids, somatostatins, and thyroid hormones. The coordinate regulation of development-associated changes in lipid metabolism results from interactions among hormones and other internal and environmental cues.


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