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International Journal of Peptides
Volume 2010 (2010), Article ID 275804, 6 pages
http://dx.doi.org/10.1155/2010/275804
Review Article

Differential Roles for Octanoylated and Decanoylated Ghrelins in Regulating Appetite and Metabolism

Department of Biology, California State University—Fresno, 2555 E. San Ramon Avenue, Fresno, CA 93720, USA

Received 1 November 2009; Accepted 23 December 2009

Academic Editor: Akio Inui

Copyright © 2010 Sara E. Schwandt et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Since its identification in 1999, ghrelin has been identified in all vertebrate groups. The “active core” of ghrelin is highly conserved among vertebrates, suggesting its biological activity to be also conserved. In fish, both acylated forms of ghrelin have been identified; however, the ratio of the ghrelin-C8 to ghrelin-C10 is not as great as observed in mammals. In the tilapia (Oreochromis mossambicus), ghrelin-C10 is the major form of ghrelin. Since fish are known to inhabit every ecological niche on earth, studies on fish have provided valuable insight into vertebrate physiology in general; it is likely that understanding the role of both acylated forms of ghrelin, in more detail, in fish will result into novel insights in the biology of ghrelin within vertebrates. In this paper we discuss ghrelin's role in regulating appetite and metabolism in fish, in general, and provide evidence that the two tilapia ghrelins exhibit different biological roles.