title: A novel lectin from Artocarpus lingnanensis induces proliferation and Th1/Th2 cytokine secretion through CD45 signaling pathway in human T lymphocytes.
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.
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Cui
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Lu
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China. 2257994291@qq.com.|Key Laboratory of Biological Molecular Medicine Research, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China. 2257994291@qq.com.
authors.forename: Qiyan
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: Clinical Laboratory, First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Faquan
authors.initials: F
authors.lastname: Lin
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Yin
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Liejun
authors.initials: L
authors.lastname: Liao
authors.affiliation: School of Preclinical Medicine of Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Huang
authors.affiliation: Department of Biochemistry and Molecular Biology, Guangxi Medical University, Nanning, 530021, Guangxi, People's Republic of China.
authors.forename: Jingping
authors.initials: J
authors.lastname: Wang
mesh_terms: D031622:Artocarpus / Q000737:chemistry*; D049109:Cell Proliferation / Q000187:drug effects; D016207:Cytokines / Q000378:metabolism*; D006801:Humans; D037102:Lectins / Q000378:metabolism*; D017493:Leukocyte Common Antigens; D015398:Signal Transduction; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016207:Cytokines; D037102:Lectins; D017493:Leukocyte Common Antigens
keywords: Artocarpus lingnanensis lectin; CD45; Cytokines; MAPK; T lymphocyte