Effects of docosahexaenoic acid on inflammation–associated cytokines in blood and pulmonary tissue of rats with severe scald injury
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摘要: 目的 观察二十二碳六烯酸(DHA)对严重烫伤大鼠血清TNF–α、IL–6、白三烯B4(LTB4)和肺组织NF–κB表达的影响。 方法 取160只SD大鼠,按随机数字表法分为假伤组、假伤+DHA组、烫伤组、烫伤+DHA组,每组40只。前2组大鼠模拟致伤,后2组大鼠背部制成30%TBSAⅢ度烫伤。伤后5 min,假伤+DHA组和烫伤+DHA组大鼠经尾静脉注射0.5 mg/mL DHA溶液1 mL/kg,假伤组和烫伤组大鼠注射生理盐水1 mL/kg。伤后3、6、12、24、48 h,各组分别取8只大鼠收集腹主动脉血及肺组织,ELISA法检测血清TNF–α、IL–6、LTB4含量,蛋白质印迹法检测肺组织NF–κB p65蛋白表达。对数据行析因设计方差分析、LSD–
t 检验。 结果 (1)假伤组大鼠伤后各时相点血清TNF–α、IL–6含量与假伤+DHA组相近(t TNF–α值为0.223~0.947、t IL–6值为0.767~2.084,P 值均大于0.05),烫伤组与烫伤+DHA组大鼠伤后各时相点血清TNF–α、IL–6含量明显高于假伤组(t TNF–α值为11.800~40.357、t IL–6值为10.334~39.321,P 值均小于0.01),烫伤+DHA组大鼠伤后各时相点血清TNF–α、IL–6含量明显低于烫伤组(t TNF–α值为–17.643~–8.331、t IL–6值为–21.596~–6.332,P 值均小于0.01)。烫伤组、烫伤+DHA组大鼠血清TNF–α、IL–6含量均呈现先增高后降低的趋势,于伤后12 h达峰值,前组峰值分别为(360.4±13.2)、(306.8±7.2)pg/mL,后组峰值则分别为(265.4±12.3)、(230.5±2.2)pg/mL。(2)假伤组大鼠伤后各时相点血清LTB4含量与假伤+DHA组相近(t 值为0.787~1.096,P 值均大于0.05),烫伤组与烫伤+DHA组大鼠伤后各时相点血清LTB4含量明显高于假伤组(t 值为7.501~38.962,P 值均小于0.01),烫伤+DHA组大鼠伤后各时相点血清LTB4含量显著低于烫伤组(t 值为–19.244~–2.532,P 值均小于0.01)。烫伤组、烫伤+DHA组大鼠血清LTB4含量均呈现先增高后降低的趋势,于伤后12 h达峰值,分别为(4.59±0.29)、(2.85±0.32)ng/mL。(3)假伤组大鼠伤后各时相点肺组织NF–κB p65蛋白表达量与假伤+DHA组相近(t 值为0.847~1.256,P 值均大于0.05),烫伤组与烫伤+DHA组大鼠伤后各时相点肺组织NF–κB p65蛋白表达量明显高于假伤组(t 值为15.167~98.074,P 值均小于0.01),烫伤+DHA组大鼠伤后各时相点肺组织NF–κB p65蛋白表达量明显低于烫伤组(t 值为–37.190~–14.415,P 值均小于0.01)。烫伤组、烫伤+DHA组大鼠NF–κB p65蛋白表达量均呈现先增高后降低的趋势,于伤后12 h达峰值,分别为4.46±0.12、2.94±0.21。 结论 对严重烫伤大鼠肠外补给DHA,可以降低其血清TNF–α、IL–6、LTB4含量以及肺组织NF–κB表达量,从而减轻机体炎症反应。Abstract: Objective To observe the effects of docosahexaenoic acid (DHA) on the expressions of TNF–α, IL–6, and leukotriene B4 (LTB4) in serum and expression of NF–κB in pulmonary tissue of rats with severe scald injury. Methods One hundred and sixty SD rats were divided into sham injury (A), sham injury+ DHA (B), scald (C), and scald+ DHA (D) groups according to the random number table, with 40 rats in each group. Rats in groups A and B were sham injured, while rats in groups C and D were inflicted with 30% TBSA full–thickness scald on the back. Rats in groups B and D were injected with 0.5 mg/mL DHA solution with the dosage of 1 mL/kg via tail vein 5 minutes post injury, while rats in groups A and C with normal saline solution 1 mL/kg. At post injury hour (PIH) 3, 6, 12, 24, and 48, pulmonary tissue and abdominal aorta blood were collected from 8 rats in each group. The serum levels of TNF–α, IL–6, and LTB4 were determined with ELISA, and the protein expression of NF–κB p65 in pulmonary tissue was determined with Western blotting. Data were processed with analysis of variance of factorial design and LSD–t test. Results (1) The serum levels of TNF–α and IL–6 of rats in group A were similar to those of group B at each time point (witht TNF–α values from 0.223 to 0.947,t IL–6 values from 0.767 to 2.084,P values above 0.05). Compared with those of group A, the serum levels of TNF–α and IL–6 of rats in groups C and D were significantly higher at each time point (witht TNF–α values from 11.800 to 40.357,t IL–6 values from 10.334 to 39.321,P values below 0.01). The serum levels of TNF–α and IL–6 of rats in group D were significantly lower than those of group C at each time point (witht TNF–α values from –17.643 to –8.331,t IL–6 values from –21.596 to –6.332,P values below 0.01). The serum levels of TNF–α and IL–6 in groups C and D both showed a trend of increase earlier and decrease later, and they peaked at PIH 12, respectively (360.4±13.2), (306.8±7.2) pg/mL and (265.4±12.3), (230.5±2.2) pg/mL. (2) The serum level of LTB4 in group A was similar to that of group B at each time point (witht values from 0.787 to 1.096,P values above 0.05). The serum level of LTB4 was significantly higher in groups C and D than in group A at each time point (witht values from 7.501 to 38.962,P values below 0.01). The serum level of LTB4 in group D was obviously lower than that of group C at each time point (witht values from –19.244 to –2.532,P values below 0.01). The serum level of LTB4 in groups C and D both showed a trend of increase earlier and decrease later, and it peaked at PIH 12, (4.59±0.29) and (2.85±0.32) ng/mL respectively. (3) The protein expression of NF–κB p65 in pulmonary tissue in group A was similar to that of group B at each time point (witht values from 0.847 to 1.256,P values above 0.05). The protein expression of NF–κB p65 was significantly higher in groups C and D than in group A at each time point (witht values from 15.167 to 98.074,P values below 0.01). The protein expression of NF–κB p65 in group D was obviously lower than that of group C at each time point (witht values from –37.190 to –14.415,P values below 0.01). The protein expression of NF–κB p65 in groups C and D both showed a trend of increase earlier and decrease later, and it peaked at PIH 12, respectively 4.46±0.12 and 2.94±0.21. Conclusions Parenteral supply of DHA to rats with severe scald injury can reduce the levels of TNF–α, IL–6, and LTB4 in serum and decrease the expression of NF–κB in pulmonary tissue, thus alleviating the inflammation response.-
Key words:
- Burns /
- Docosahexaenoic acids /
- NF–kappa B /
- Lung /
- Inflammation mediators
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