Abstract:
:The phylum Cnidariais one of the earliest branches in the animal tree of life providing crucial insights into the early evolution of immunity. The diversity in cnidarian life histories and habitats raises several important issues relating to immunity. First, in the absence of specific immune cells, cnidarians must have effective mechanisms to defend against microbial pathogens. Second, to maintain tissue integrity, colonial forms have to rely on their capacity of self/nonself discrimination to rapidly detect approaching allogeneic cells as foreign and to eliminate them. And third, since cnidarians are colonized by complex bacterial communities and in many cases are home to algal symbionts, successful growth means for cnidarians to be able to distinguish between beneficial symbionts and pathogenic intruders. The aim of this chapter is to review the experimental evidence for innate immune reactions in Cnidaria. We show that in these diploblastic animals consisting of only two cell layers; the epithelial cells are able to mediate all innate immune responses. The endodermal epithelium appears as a chemical barrier employing antimicrobial peptides while the ectodermal epithelium is a physicochemical barrier supported by a glycocalix. Microbial recognition is mediated by pattern recognition receptors such as Toll- and Nod-like receptors. Together, the data support the hypothesis that the establishment of epithelial barriers represents an important step in evolution of host defense in eumetazoan animals more than 600 million years ago.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Augustin R,Bosch TCdoi
10.1007/978-1-4419-8059-5_1subject
Has Abstractpub_date
2010-01-01 00:00:00pages
1-16eissn
0065-2598issn
2214-8019journal_volume
708pub_type
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