李斌+劉麗平+郭鴻+等
蘭州大學第一醫院重癥醫學科,甘肅蘭州 730000
[摘要] 目的 探討環氧合酶2(COX-2)和核因子-κB(NF-κB)在膿毒癥大鼠的肝組織炎性反應中的表達及其相互關系。 方法 隨機選擇54只200~220 g成年Wistar大鼠分為3組,假手術A組(實驗開始前2 h腹腔內注射生理鹽水,麻醉后行開腹手術,不做模型誘導,n = 6);膿毒癥模型B組[實驗開始前2 h腹腔內注射生理鹽水,麻醉后盲腸結扎穿孔(cecal ligation and puncture,CLP)建立腹腔感染模型,n = 24];NS398干預C組(CLP建立腹腔感染模型,實驗開始前2 h腹腔內注射NS398 10 mg/kg,n = 24)。以CLP法建立動物模型,逆轉錄聚合酶鏈反應(RT-PCR)法檢測COX-2 mRNA在肝臟組織的表達,免疫組織化學法(Elisa)測定NF-κB在肝細胞中表達,并檢測肝臟功能,如谷丙轉氨酶(ALT)、谷草轉氨酶(AST)和肝臟大體標本及病理變化。 結果 ①COX-2 mRNA 在A組呈低表達(1040.82±2.77),各時點C組較B組明顯降低。②肝細胞中NF-κB在A組表達較低[3 h:(0.60±0.54),6 h:(0.60±0.54),12 h:(0.60±0.54),24 h:(0.60±0.54)],膿毒癥后其表達明顯增高[3 h:(2.60±0.55),6 h:(7.20±1.09),12 h:(12.20±0.32),24 h:(6.40±0.73)];在同一時點比較,B組低于C組[3 h:(1.60±1.89),6 h:(6.60±0.79),12 h:(9.20±2.68),24 h:(4.80±1.60)](P < 0.05)。③Pearson相關分析,COX-2 mRNA與NF-κB呈直線正相關(r=0.685,P = 0.042)。④膿毒癥后肝臟轉氨酶明顯增高[ALT:3 h:(174.00±18.73)U/L,6 h:(204.67±23.59)U/L,12 h:(311.00±44.53)U/L,24 h:(506.67±24.79)U/L;AST:3 h:(619.67±145.81)U/L,6 h:(594.00±34.59)U/L,12 h:(1027.66±136.21)U/L,24 h:(1518.33±139.38)U/L],NS-398干預后降低[ALT:3 h:(105.33±18.01)U/L,6 h:(157.00±32.36)U/L,12 h:(101.00±16.52)U/L,24 h:(93.33±10.41)U/L;AST:3 h:(217.00±26.21)U/L,6 h:(461.33±22.01)U/L,12 h:(322.00±72.33)U/L,24 h:(268.00±98.57)U/L],C組與B組差異有統計學意義(P < 0.05),提示經干預肝臟病理損傷減輕。 結論 COX-2在膿毒癥后引起的肝損傷中占有重要地位,NS-398通過特異性抑制COX-2來抑制肝細胞中NF-κB的表達,從而減輕肝細胞損傷。
[關鍵詞] 膿毒癥;COX-2;NS398;肝損傷;NF-κB
[中圖分類號] R631.3 [文獻標識碼] A [文章編號] 1673-7210(2014)03(b)-0014-05
Express of cyclooxygenase-2 and NF-κB for hepatocellular injury in rats with sepsis
LI Bin LIU Liping GUO Hong LI Xun
Intensive Care Units, the First Hospital of Lanzhou University, Gansu Province, Lanzhou 730000, China
[Abstract] Objective To study the expression of cyclooxygenase 2 and NF-κB on hepatic inflammatory reaction of rats with sepsis and their interrelation. Methods 54 Wistar rats (200-220 g) were randomly divided into 3 groups. A: sham group (with saline injected into intraperitoneal 2 h before the experiment, and operation after anesthesia, no-maked model induced, n = 6); B: sepsis model group (with saline injected into intraperitoneal 2 h before the experiment, and to make sepsis model after anesthesia by using CLP, n = 24); C: NS-398 intervention group ( to make sepsis model by using CLP, NS398 10 mg/kg injected into intraperitoneal 2 h before the experiment, n = 24). Animal model was established with cecum ligation perforation (CLP) method. RT-PCR were used to determine COX-2 mRNA expression in liver tissue, NF-κB of hepatocyte was detected by immunohistochemical method. At the same time, ALT, AST and liver pathological changes were detected. Results ①The expression of COX-2 mRNA were lower in group A (1040.82±2.77), higher in group B than C at the same time. ②The expression of NF-κB were lower in hepatocyte in group A [3 h: (0.60±0.54), 6 h: (0.60±0.54), 12 h: (0.60±0.54), 24 h: (0.60±0.54)], but higher after CLP [3 h: (2.60±0.55), 6 h: (7.20±1.09), 12 h: (12.20±0.32), 24 h: (6.40±0.73)], but were higher in group B than in group C [3 h: (1.60±1.89), 6 h: (6.60±0.79), 12 h: (9.20±2.68), 24 h: (4.80±1.60)] at the same time (P < 0.05). According to Pearson correlation analysis, it was positive correlation between cyclooxygenase-2 mRNA and NF-κB (r = 0.685, P = 0.042). ③Serum ALT and AST were significantly increased in B [ALT: 3 h: (174.00±18.73)U/L, 6 h: (204.67±23.59)U/L, 12 h: (311.00±44.53)U/L, 24 h: (506.67±24.79)U/L; AST: 3 h: (619.67±145.81)U/L, 6 h: (594.00±34.59)U/L, 12 h: (1027.66±136.21)U/L, 24 h: (1518.33±139.38)U/L] than group C [ALT: 3 h: (105.33±18.01)U/L, 6 h: (157.00±32.36)U/L, 12 h: (101.00±16.52)U/L, 24 h: (93.33±10.41)U/L; AST: 3 h: (217.00±26.21)U/L, 6 h: (461.33±22.01)U/L, 12 h: (322.00±72.33)U/L, 24 h: (268.00±98.57)U/L], but significantly decreased in group C than group B (P < 0.05). Those prompted Hepatic pathologic injury extenuate after intervention. Conclusion COX-2 plays an important role in hepatic injury by sepsis, NS-398 can peculiarly inhibit the expression of NF-κB by inhibiting COX-2, thus relieves injury of hepatocyte.
[Key words] Sepsis; Cyclooxygenase-2; NS398; Hepatic injury; NF-κB
膿毒癥(sepsis)是ICU最為常見的疾病,常常繼發于嚴重創傷、燒傷、休克、大手術后,而膿毒性休克、多器官功能障礙綜合征(MODS)等是其進一步發展而來的,已成為當今外科ICU首要死亡原因[1-2],而肝臟是最常受累的器官之一。核因子-κB(NF-κB)是炎癥和免疫應答中的關鍵因素,能夠在基因水平調控一些致炎癥細胞因子和誘生型酶,如環氧合酶2(cyclooxygenase-2,COX-2)、一氧化氮合酶(iNOS)等的表達[1-3]。……