The Role of Fc Receptors in the Innate Immune System of Flounders Purported to Be Homologs of FcγRII and FcγRIII.

FcγR is a significant opsonin receptor located on the surface of immune cells, playing a crucial role in Ab-dependent cell-mediated immunity. Our previous work revealed opposite expression trends of FcγRII and FcγRIII in flounder mIgM+ B lymphocytes after phagocytosis of antiserum-opsonized Edwardsiella tarda. This observation suggests that FcγRII and FcγRIII might serve distinct functions in Ig-opsonized immune responses.

Cluster of differentiation antigens: essential roles in the identification of teleost fish T lymphocytes.

Cluster of differentiation (CD) antigens are cell surface molecules expressed on leukocytes and other cells associated with the immune system. Antibodies that react with CD antigens are known to be one of the most essential tools for identifying leukocyte subpopulations. T lymphocytes, as an important population of leukocytes, play essential roles in the adaptive immune system.

Kinetics of T lymphocyte subsets and B lymphocytes in response to immunostimulants in flounder (Paralichthys olivaceus): implications for CD4 T lymphocyte differentiation.

CD4 T lymphocytes play crucial roles in the adaptive immune system. CD4, as the most effective marker to delineate the T-helper subsets, was identified in many fish species. Two CD4 homologs, CD4-1 and CD4-2, have been reported in flounder (Paralichthys olivaceus).

Immune responses of flounder Paralichthys olivaceus vaccinated by immersion of formalin-inactivated Edwardsiella tarda following hyperosmotic treatment.

The aim of the present study was to evaluate the effects of hyperosmotic immersion (HI) vaccination and determine the optimum hyperosmotic salinity for flounder Paralichthys olivaceus by investigating its immune responses following vaccination. Flounder were immersed in 1 of 3 hyperosmotic solutions at 50, 60 and 70‰ salinity, then transferred into 30‰ salinity normal seawater containing formalin-inactivated Edwardsiella tarda for vaccination (3 HI groups), or were immersed in normal seawater as direct immersion (DI group). The results showed that the percentages of surface membrane immunoglobulin-positive (sIg+) cells in peripheral blood leukocytes and spleen leukocytes induced by HI were significantly higher than that with DI (p < 0.

[Distribution and source of particulate organic carbon and particulate nitrogen in the Yangtze River Estuary in summer 2012].

Based on the data from the cruise carried out in August 2012 in the Yangtze River Estuary and its adjacent waters, spatial distributions of particulate organic carbon (POC), particulate nitrogen (PN) and their relationships with environmental factors were studied, and the source of POC and the contribution of phytoplankton to POC were analyzed combined with n (C)/n (N) ratio and chlorophyll a (Chl a) in the Yangtze River Estuary in summer 2012. The results showed that the concentrations of POC in the Yangtze River Estuary ranged from 0.68 mg x L(-1) to 34.

Monoclonal antibodies against 27.8 kDa protein receptor efficiently block lymphocystis disease virus infection in flounder Paralichthys olivaceus gill cells.

In previous research using co-immunoprecipitation, a 27.8 kDa protein in flounder Paralichthys olivaceus gill (FG) cells was found to bind lymphocystis disease virus (LCDV). In this paper, 13 hybridomas secreting monoclonal antibodies (MAbs) against the 27.

Monoclonal antibodies recognizing mucus immunoglobulin and surface immunoglobulin-positive cells of flounder (Paralichthys olivaceus).

Mucus immunoglobulin (Ig) of flounder (Paralichthys olivaceus) was purified by the combination of salting-out, Sephacryl S-300 gel filtration chromatography and DEAE Sepharose chromatography. According to the SDS-PAGE and native-PAGE, the purified mucus Ig showed apparent molecular weights of 72 kDa (heavy chain) and 26 kDa (light chain), and a total molecular weight of 798 kDa, which indicated mucus IgM was in tetrameric form. Purified mucus Ig was used to immunize the Balb/C mice, nineteen hybridomas secreting monoclonal antibodies (mAbs) against flounder mucus Ig were obtained by indirect enzyme-linked immunosorbent assay, and three of them designated as 1A-M2, 1C-M10 and 3F-M9 were cloned by limiting dilution.

Identification of a 27.8 kDa protein from flounder gill cells involved in lymphocystis disease virus binding and infection.

In vitro, lymphocystis disease virus (LCDV) infection of flounder gill (FG) cell cultures causes obvious cytopathic effect (CPE). We describe attempts to isolate and characterize the LCDV-binding molecule(s) on the plasma membrane of FG cells that were responsible for virus entry. The results showed that the co-immunoprecipitation assay detected a 27.

Response of mucosal and systemic sIgM-positive cells in turbot (Scophthalmus maximus L.) immunization with Edwardsiella tarda.

Indirect fluorescence analyze technology (IFAT) and fluorescence-activated cell sorter (FACS) analysis were used to detect surface IgM positive cells (sIgM+ cells) in lymphoid tissues of unvaccinated turbots and vaccinated ones with inactivated Edwardsiella tarda. The results were as follows: (1) The percentage of sIgM+ cells respectively was 0+/-0.00% of skin, 1.

Whitespotted puffer Arothron hispidus, a new host for lymphocystis in Qingdao Aquarium of China.

In April 2004 white nodular lesions were found on the fins of whitespotted puffer Arothron hispidus (Linnaeus). Diagnostic studies were carried out to confirm the disease using light and electron microscopy, histochemical methods and PCR. The results revealed that the nodules were composed of giant cells up to 400 microm in diameter.