title: Effects of T-2 toxin and selenium on chondrocyte expression of matrix metalloproteinases (MMP-1, MMP-13), α2-macroglobulin (α2M) and TIMPs.
abstract: T-2 toxin is regarded as an important etiological factor of Kashin-Beck disease, and supplementation of selenium-salt partly prevents Kashin-Beck disease. The present study investigated the effects of T-2 toxin on the degradation of type II collagen in human chondrocytes in vitro. Human chondrocytes were isolated and cultured on bone matrix gelatin to form an artificial cartilage model in vitro with or without T-2 toxin and selenium. Immunohistochemistry analyses showed that T-2 toxin decreased type II collagen staining and selenium appeared to prevent the decrease in type II collagen induced by T-2 toxin in engineered cartilage. Then, Western blot and RT-PCR analyses showed that an increase in MMP-13 and MMP-1 expressions, and a decrease in the expression of the general endoproteinase inhibitor (α(2)M) were induced by T-2 toxin. Gelatin reverse zymography showed that TIMP-1 and TIMP-2 levels were decreased in a dose-dependent manner after exposure of T-2 toxin. Selenium had a protective role by increasing the level of type II collagen protein through down-regulation of MMP-13 protein and mRNA expression and up-regulation of TIMP-1 and TIMP-2 expressions. These data suggest T-2 toxin induces cartilage matrix degradation by the up-regulation of MMP-13 and TIMP-1, and down-regulation of TIMP-2 and α(2)M expressions.
authors.affiliation: Institute of Endemic Diseases, Medical School of Xi'an Jiaotong University, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an, Shaanxi, PR China.
authors.forename: Jinghong
authors.initials: J
authors.lastname: Chen
authors.forename: Yonglie
authors.initials: Y
authors.lastname: Chu
authors.forename: Junling
authors.initials: J
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Jiayuan
authors.initials: J
authors.lastname: Liu
authors.forename: Jiali
authors.initials: J
authors.lastname: Wang
mesh_terms: D049109:Cell Proliferation / Q000187:drug effects; D019902:Chondrocytes / Q000187:drug effects* / Q000378:metabolism; D024043:Collagen Type II / Q000032:analysis / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D020781:Matrix Metalloproteinase 1 / Q000032:analysis / Q000235:genetics; D053509:Matrix Metalloproteinase 13 / Q000032:analysis / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis; D012643:Selenium / Q000494:pharmacology*; D013605:T-2 Toxin / Q000633:toxicity*; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000032:analysis / Q000235:genetics; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000032:analysis / Q000235:genetics; D000511:alpha-Macroglobulins / Q000032:analysis / Q000235:genetics
chemical_list: D024043:Collagen Type II; D012333:RNA, Messenger; D019715:Tissue Inhibitor of Metalloproteinase-1; D000511:alpha-Macroglobulins; D019716:Tissue Inhibitor of Metalloproteinase-2; D053509:Matrix Metalloproteinase 13; D020781:Matrix Metalloproteinase 1; D012643:Selenium; D013605:T-2 Toxin