title: Natural History of Innate Host Defense Peptides.
abstract: Host defense peptides act on the forefront of innate immunity, thus playing a central role in the survival of animals and plants. Despite vast morphological changes in species through evolutionary history, all animals examined to date share common features in their innate immune defense strategies, hereunder expression of host defense peptides (HDPs). Most studies on HDPs have focused on humans, domestic and laboratory animals. More than a thousand different sequences have been identified, yet data on HDPs in wild-living animals are sparse. The biological functions of HDPs include broad-spectrum antimicrobial activity and immunomodulation. Natural selection and coevolutionary host-pathogen arms race theory suggest that the extent and specificity of the microbial load influences the spectrum and potency of HDPs in different species. Individuals of extant species-that have lived for an extended period in evolutionary history amid populations with intact processes of natural selection-likely possess the most powerful and well-adapted "natural antibiotics". Research on the evolutionary history of the innate defense system and the host in context of the consequences of challenges as well as the efficacy of the innate immune system under natural conditions is therefore of immediate interest. This review focuses on evolutionary aspects of immunophysiology, with emphasis on innate effector molecules. Studies on host defense in wild-living animals may significantly enhance our understanding of inborn immune mechanisms, and help identify molecules that may assist us to cope better with the increasing microbial challenges that likely follow from the continuous amplification of biodiversity levels on Earth.
authors.affiliation: Department of Anatomy and Physiology, Kansas State University, Manhattan, KS, USA.
authors.forename: A
authors.initials: A
authors.lastname: Linde
authors.affiliation: Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Wachter
authors.affiliation: Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany.
authors.forename: O P
authors.initials: OP
authors.lastname: Höner
authors.affiliation: Department of Human Nutrition, College of Human Ecology, Kansas State University, 143A Justin Hall, Manhattan, KS, 66506-1407, USA.
authors.forename: L
authors.initials: L
authors.lastname: Dib
authors.affiliation: School of Veterinary Medicine, Oklahoma State University, Stillwater, OK, USA.
authors.forename: C
authors.initials: C
authors.lastname: Ross
authors.affiliation: Research Institute of Veterinary Science, Autonomous University of Baja California, Mexicali, Mexico.
authors.forename: A R
authors.initials: AR
authors.lastname: Tamayo
authors.affiliation: Department of Anatomy and Physiology, Kansas State University, Manhattan, KS, USA.
authors.forename: F
authors.initials: F
authors.lastname: Blecha
authors.affiliation: Department of Human Nutrition, College of Human Ecology, Kansas State University, 143A Justin Hall, Manhattan, KS, 66506-1407, USA. tmelgare@ksu.edu.|Ancillary Faculty in Anatomy & Physiology, College of Veterinary Medicine, Kansas State University, 143A Justin Hall, Manhattan, KS, 66506-1407, USA. tmelgare@ksu.edu.
authors.forename: T
authors.initials: T
authors.lastname: Melgarejo
keywords: Cathelicidins; Comparative genomics; Defensins; Innate immunity; Molecular timescale; Vertebrate evolution