title: Calcineurin mediates the immune response of hemocytes through NF-kappaB signaling pathway in pearl oyster (Pinctada fucata).
abstract: Calcineurin (CN), a multifunctional protein, mediates the immune response through diverse signaling pathways in mammals, while the function of CN in the immune response of molluscan hemocytes still remains unclear. In the present study, we detected the distribution of CN in various tissues and the expression levels of Pf-CNA and Pf-CNB gene in hemocytes of Pinctada fucata. After the preparation of hemocyte monolayers, we checked the response of enzymatic activity of CN, the degradation level of IkappaBalpha, the activity of iNOS and the production of NO, and IL-2 to the challenge of lipopolysaccharide (LPS) and cyclosporin A (CsA). CN activity in hemocytes was very sensitive to both the stimulation of LPS and the inhibition of CsA. Most importantly, IkappaBalpha degradation in hemocytes was induced by LPS and attenuated by CsA. Consequently, the activity of iNOS was elevated and the production of NO was increased. Additionally, we found that the synthesis of IL-2 was increased by LPS but was apparently weakened by CsA. In vivo bacterial clearance experiments showed that CsA significantly decreased the ability of in vivo bacteria clearance in pearl oyster. All the results revealed, for the first time, that CN mediated the immune response of molluscan hemocytes via activating NF-kappaB signaling pathway.
authors.affiliation: Institute of Marine Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.
authors.forename: Changzhong
authors.initials: C
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Liang
authors.forename: Zhuojun
authors.initials: Z
authors.lastname: Ma
authors.forename: Yilin
authors.initials: Y
authors.lastname: Hu
authors.forename: Zhenguang
authors.initials: Z
authors.lastname: Yan
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
authors.forename: Zi
authors.initials: Z
authors.lastname: Fang
authors.forename: Hongzhong
authors.initials: H
authors.lastname: Wang
authors.forename: Guiyou
authors.initials: G
authors.lastname: Zhang
authors.forename: Liping
authors.initials: L
authors.lastname: Xie
authors.forename: Rongqing
authors.initials: R
authors.lastname: Zhang
mesh_terms: D000818:Animals; D018407:Bacterial Physiological Phenomena; D019703:Calcineurin / Q000378:metabolism*; D016572:Cyclosporine / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006434:Hemocytes / Q000187:drug effects / Q000276:immunology / Q000382:microbiology; D007376:Interleukin-2 / Q000276:immunology; D008070:Lipopolysaccharides / Q000494:pharmacology; D016328:NF-kappa B / Q000276:immunology*; D049911:Pinctada / Q000276:immunology* / Q000382:microbiology; D015398:Signal Transduction / Q000276:immunology*
chemical_list: D007376:Interleukin-2; D008070:Lipopolysaccharides; D016328:NF-kappa B; D016572:Cyclosporine; D019703:Calcineurin