title: Gene delivery of SOCS3 protects mice from lethal endotoxic shock.
abstract: Suppressor of cytokine signaling 3 (SOCS3) was reported as a feedback inhibitor of cytokine receptor signaling by inhibiting the JAK-STAT signal transduction pathway. We sought to test the anti-endotoxic septic shock effect of liposome mediated gene delivery of SOCS3 in a lethal endotoxic shock mouse model. BALB/c mice were injected intraperitoneally with 200 microg pcDNA3.1-SOCS3 cationic liposomes, while pcDNA3.1-IL-10 and empty vector as positive and negative control respectively. Forty-eight hours after gene delivery, mice were challenged with 4 microg of E.coli 0127:B8 LPS and 18 mg D-GalN administered i.p. 90 min later, serum TNF-alpha level was determined. Survival over the next 48 h was evaluated. Peritoneal macrophages from survival mice were stimulated in vitro with 1 ug/ml LPS for 18 h, and the supernatants were harvested for determination of the amount of TNF-alpha. We found that gene delivery of SOCS3 significantly increase the mouse survival rate from 27.8 +/- 9.6% of control group to 61.1 +/- 9.6% (p < 0.01). In comparison with control group (218 +/- 13 pg/ml) and sham delivery group (2,122 pg/ml), gene delivery of SOCS3 reduced the level of serum TNF-alpha (68 +/- 9 pg/ml) significantly (p < 0.01). Furthermore, gene delivery of SOCS3 displayed the capacity of prevention of tolerance of peritoneal macrophages to LPS. These findings suggest that gene delivery of SOCS3 mediated by liposome is a promising approach for endotoxic septic shock treatment.
authors.affiliation: Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China. minfang89@yahoo.com
authors.forename: Min
authors.initials: M
authors.lastname: Fang
authors.forename: Hong
authors.initials: H
authors.lastname: Dai
authors.forename: Guang
authors.initials: G
authors.lastname: Yu
authors.forename: Feili
authors.initials: F
authors.lastname: Gong
mesh_terms: D000818:Animals; D005260:Female; D015316:Genetic Therapy; D005822:Genetic Vectors / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology; D007274:Injections, Intraperitoneal; D017737:Macrophages, Peritoneal / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D012772:Shock, Septic / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D015398:Signal Transduction / Q000235:genetics* / Q000276:immunology; D000071223:Suppressor of Cytokine Signaling 3 Protein; D050826:Suppressor of Cytokine Signaling Proteins / Q000235:genetics* / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
chemical_list: C106644:SOCS3 protein, human; D000071223:Suppressor of Cytokine Signaling 3 Protein; D050826:Suppressor of Cytokine Signaling Proteins; D014409:Tumor Necrosis Factor-alpha