title: Evasion of mucosal defenses during Aeromonas hydrophila infection of channel catfish (Ictalurus punctatus) skin.
abstract: The mucosal surfaces of fish serve as the first line of defense against the myriad of aquatic pathogens present in the aquatic environment. The immune repertoire functioning at these interfaces is still poorly understood. The skin, in particular, must process signals from several fronts, sensing and integrating environmental, nutritional, social, and health cues. Pathogen invasion can disrupt this delicate homeostasis with profound impacts on signaling throughout the organism. Here, we investigated the transcriptional effects of virulent Aeromonas hydrophila infection in channel catfish skin, Ictalurus punctatus. We utilized a new 8 × 60 K Agilent microarray for catfish to examine gene expression profiles at critical early timepoints following challenge--2 h, 8 h, and 12 h. Expression of a total of 2,168 unique genes was significantly perturbed during at least one timepoint. We observed dysregulation of genes involved in antioxidant, cytoskeletal, immune, junctional, and nervous system pathways. In particular, A. hydrophila infection rapidly altered a number of potentially critical lectins, chemokines, interleukins, and other mucosal factors in a manner predicted to enhance its ability to adhere to and invade the catfish host.
authors.affiliation: Department of Fisheries and Allied Aquacultures, Auburn University, Auburn, AL 36849, USA.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Ruijia
authors.initials: R
authors.lastname: Wang
authors.forename: Baofeng
authors.initials: B
authors.lastname: Su
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Luo
authors.forename: Jeffery
authors.initials: J
authors.lastname: Terhune
authors.forename: Benjamin
authors.initials: B
authors.lastname: Beck
authors.forename: Eric
authors.initials: E
authors.lastname: Peatman
mesh_terms: D016980:Aeromonas hydrophila / Q000276:immunology* / Q000472:pathogenicity; D000818:Animals; D005393:Fish Diseases / Q000276:immunology*; D020869:Gene Expression Profiling; D016905:Gram-Negative Bacterial Infections / Q000276:immunology / Q000662:veterinary*; D007059:Ictaluridae / Q000235:genetics / Q000276:immunology* / Q000382:microbiology; D009092:Mucous Membrane / Q000276:immunology / Q000382:microbiology; D040081:Protein Array Analysis / Q000662:veterinary*