title: Cutaneous immune responses in the common carp detected using transcript analysis.
abstract: In order to detect new immune-related genes in common carp (Cyprinus carpio L.) challenged by an ectoparasitic infection, two cDNA libraries were constructed from carp skin sampled at 3 and 72h after infection with Ichthyophthirius multifiliis. In a total of 3500 expressed sequence tags (ESTs) we identified 82 orthologues of genes of immune relevance previously described in other organisms. Of these, 61 have never been described before in C. carpio, thus shedding light on some key components of the defence mechanisms of this species. Among the newly described genes, full-length molecules of prostaglandin D2 synthase (PGDS), the CC chemokine molecule SCYA103, and a second gene for the carp beta(2)-microglobulin (beta(2)m), beta(2)m-2, were described. Transcript amounts of the genes PGDS, interferon (IFN), SCYA103, complement factor 7 (C7), complement factor P (FP), complement factor D (FD) and beta(2)m-2 were evaluated by real-time quantitative PCR (RQ-PCR). Samples from skin, blood and liver from fish challenged with I. multifiliis were taken at 3, 12, 24, 36 and 48h post infection. Higher expression levels of most of these transcripts were observed in skin from uninfected fish, compared to the transcript levels detected in blood and liver from the same animals. Also, there was significant down-regulation of the genes PGDS and beta(2)m-2 in skin, whilst significant up-regulation was observed for the C7 and SCYA103 genes in liver of fish infected with the parasite. These results confirm the active role of fish skin in the immune response against infections, acting as an important site of expression of immune-related molecules.
authors.affiliation: Department of Veterinary Pathobiology, Laboratory for Fish Diseases, The Royal Veterinary and Agricultural University, Stigbøjlen 7, DK-1870 Frederiksberg C, Denmark. xanti@usc.es
authors.forename: Santiago Fernandez
authors.initials: SF
authors.lastname: Gonzalez
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Chatziandreou
authors.forename: Michael Engelbrecht
authors.initials: ME
authors.lastname: Nielsen
authors.forename: Weizhong
authors.initials: W
authors.lastname: Li
authors.forename: Jane
authors.initials: J
authors.lastname: Rogers
authors.forename: Ruth
authors.initials: R
authors.lastname: Taylor
authors.forename: Ysabel
authors.initials: Y
authors.lastname: Santos
authors.forename: Andrew
authors.initials: A
authors.lastname: Cossins
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017951:Antigen Presentation / Q000235:genetics; D002347:Carps / Q000235:genetics / Q000276:immunology*; D002633:Chemotaxis / Q000235:genetics; D003165:Complement System Proteins / Q000235:genetics; D020224:Expressed Sequence Tags; D007109:Immunity / Q000235:genetics*; D007113:Immunity, Innate / Q000235:genetics; D007249:Inflammation / Q000235:genetics; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis; D015398:Signal Transduction / Q000235:genetics; D012867:Skin / Q000737:chemistry / Q000276:immunology*; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D003165:Complement System Proteins