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Erschienen in: Journal of Natural Medicines 2/2017

21.01.2017 | Original Paper

A novel lectin from Artocarpus lingnanensis induces proliferation and Th1/Th2 cytokine secretion through CD45 signaling pathway in human T lymphocytes

verfasst von: Bo Cui, Lu Li, Qiyan Zeng, Faquan Lin, Lijun Yin, Liejun Liao, Min Huang, Jingping Wang

Erschienen in: Journal of Natural Medicines | Ausgabe 2/2017

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Abstract

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.
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Metadaten
Titel
A novel lectin from Artocarpus lingnanensis induces proliferation and Th1/Th2 cytokine secretion through CD45 signaling pathway in human T lymphocytes
verfasst von
Bo Cui
Lu Li
Qiyan Zeng
Faquan Lin
Lijun Yin
Liejun Liao
Min Huang
Jingping Wang
Publikationsdatum
21.01.2017
Verlag
Springer Japan
Erschienen in
Journal of Natural Medicines / Ausgabe 2/2017
Print ISSN: 1340-3443
Elektronische ISSN: 1861-0293
DOI
https://doi.org/10.1007/s11418-017-1073-x

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