title: The effects of PDTC on interleukin-1beta-induced nitric oxide production in chondrocytes.
abstract: In order to find new drugs to inhibit nitric oxide (NO) production, the effects of pyrrolidine dithiocarbamate (PDTC), a nuclear factor-kappa B (NF-kappaB) inhibitor, on recombinant human interleukin-1beta (rhIL-1beta)-induced NO production in chondrocytes were investigated. Rat chondrocytes were isolated and cultured, divided into control, P0, P1, P2, P3 and P4 groups. The chondrocytes in the P0, P1, P2, P3 and P4 groups were treated with different concentrations of PDTC (0, 3, 10, 30, and 50 micromol/L respectively) for 1 h and then incubated with 5 U/mL rhIL-1beta for 24 h. NO assay kit and RT-PCR were used to detect the NO content and the iNOS mRNA expression in the chondrocytes. The expression level of iNOS mRNA in control, P0, P1, P2, P3 and P4 groups was 0.02+/-0.01, 1.24+/-0.13, 1.21+/-0.14, 0.61+/-0.11, 0.40+/-0.09, 0.21+/-0.06, and the relative content of NO was 15.8+/-2.7, 100+/-14.8, 92.6+/-9.3, 68.3+/-14.2, 27.5+/-9.8, 19.8+/-3.6, respectively. In the P0, P1, P2, P3 and P4 groups, the expression of iNOS mRNA and NO production were significantly increased as compared with those in the control group. As compared with the P0 group, the expression of iNOS mRNA and NO content in control group were lower. In the P2, P3 and P4 groups, PDTC could significantly inhibit the expression of iNOS and NO production induced by rhIL-1beta in a concentration-dependent manner. It is suggested that PDTC can inhibit NO production and iNOS mRNA expression induced by IL-1beta, which may provide an alternative method for the treatment of osteoarthritis.
authors.affiliation: Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China. jianxiang98@tom.com
authors.forename: Jianxiang
authors.initials: J
authors.lastname: Liu
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Du
authors.forename: Shuhua
authors.initials: S
authors.lastname: Yang
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Qiu
authors.forename: Riguang
authors.initials: R
authors.lastname: Liu
authors.forename: Chengqing
authors.initials: C
authors.lastname: Yi
authors.forename: Xinchun
authors.initials: X
authors.lastname: Li
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D019902:Chondrocytes / Q000166:cytology / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D053583:Interleukin-1beta / Q000494:pharmacology*; D008297:Male; D016328:NF-kappa B / Q000037:antagonists & inhibitors; D009569:Nitric Oxide / Q000096:biosynthesis*; D052247:Nitric Oxide Synthase Type II / Q000235:genetics / Q000378:metabolism; D011392:Proline / Q000031:analogs & derivatives* / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013859:Thiocarbamates / Q000494:pharmacology*
chemical_list: D053583:Interleukin-1beta; D016328:NF-kappa B; D012333:RNA, Messenger; D013859:Thiocarbamates; C066229:prolinedithiocarbamate; D009569:Nitric Oxide; D011392:Proline; D052247:Nitric Oxide Synthase Type II; C496318:Nos2 protein, rat