A novel lectin from Artocarpus lingnanensis induces proliferation and Th1/Th2 cytokine secretion through CD45 signaling pathway in human T lymphocytes
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Lectins are carbohydrate-binding proteins and have been used for purification and characterization of glycoproteins. In this study, a novel 58.9-kDa tetrameric lectin from Artocarpus lingnanensis seeds was purified, characterized, and its mitogenic potential was evaluated. The hemagglutination inhibition assay indicated that Artocarpus lingnanensis lectin (ALL) showed specificity toward galactose. ALL was effectively purified in a single-step using affinity chromatography on a galactose-Sepharose column. ALL showed pH optima between 5.0 and 9.0, and optimal temperature between 20 and 40 °C. ALL triggered proliferation and activation of human T lymphocytes (e.g., CD4+ T lymphocytes). Flow cytometry and laser scanning confocal microscopy revealed binding of ALL to T cells and colocalized with CD45. Affinity chromatography and Western blot suggested that CD45 isolated from human T cell membrane fraction may be the major receptor of ALL. CD45 blocking antibody attenuated the binding and proliferation of T cells induced by ALL. CD45-PTPase inhibitor dephostatin reduced ALL-induced T cells proliferation and expression of CD25 and pZAP-70. Furthermore, secretion of ALL-induced Th1/Th2 cytokines was blocked with dephostatin. Also, dephostatin inhibited phosphorylation of ALL-mediated activation of ERK and p38MAPK. This study demonstrates the involvement of CD45-mediated signaling in ALL-induced T lymphocyte proliferation and Th1/Th2 cytokine secretion through activation of p38 and ERK.
KeywordsArtocarpus lingnanensis lectin T lymphocyte Cytokines CD45 MAPK
This work was supported by National Natural Science Foundation of China (Grant No. 81160366), Guangxi Natural Science Foundation Grant (#0832130), and Guangxi Programs for Science and Technology Development (#10124001A-23). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Conflict of interest
The authors declare that there are no conflicts of interest. The authors alone are responsible for the content and writing of this article.
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