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Production, characterization and application of monoclonal antibodies to the coelomocytes of sea urchin Strongylocentrotus intermedius.
Fish & Shellfish Immunology 2018 April
Sea urchin is one of marine animals with high economic and great scientific research values. Axial organ is a glandular organ that has been presumed as coelomocytes origin site. In this paper, two monoclonal antibodies (3G10 and 6B3) against coelomocytes of sea urchin Strongylocentrotus intermedius were developed by hybridoma technique. The mAbs were characterized by indirect immunofluorescence assay test (IIFAT), flow cytometry (FCM) and western blot assay. Results showed that mAb 3G10 recognized a protein of a molecular weight of 17 kDa in the spherule cells, while mAb 6B3 reacted with a protein of a molecular weight of 35 kDa in the phagocytes. Furthermore, specificity analysis revealed that the two mAbs could react with the coelomocytes of sea urchin S. nudus and Hemicentrotus pulcherrimus, but not with those of other common echinoderms including sea cucumber Apostichopus japonicus and starfish Asterias rollestoni. To determine whether the coelomocytes exist in the axial organ of sea urchin, the IIFAT assays were carried out based on the two mAbs. Result showed that positive fluorescence signals were distributed in the organ. It was revealed that the axial organ was rich in coelomocytes, which suggests that the organ may play as a producing source or reservoir in the ontogenesis of coelomocytes of sea urchin.
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