严重烧伤大鼠肝脏内质网应激相关蛋白的表达及其意义  被引量:8

Expressions of endoplasmic reticulum stress associated proteins in livers of severely burned rats

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作  者:褚万立[1] 柴家科[1] 冯永强[1] 马丽[1] 朱桂英[1] 张海军[1] 胡超[1] 

机构地区:[1]解放军总医院第一附属医院烧伤整形科,北京100048

出  处:《中华医学杂志》2012年第12期853-856,共4页National Medical Journal of China

基  金:国家自然科学基金(81120108014、81071544、30870951);首都医学发展科研基金(2009-1025)

摘  要:目的探讨严重烧伤大鼠肝脏内质网应激相关蛋白表达变化及其可能意义。方法Wistar大鼠64只随机数字表法随机分为对照组及烧伤组(30%体表面积Ⅲ°烫伤),各32只。伤后第1、4、7、14d天采集大鼠肝脏组织。用Western印迹法检测内质网应激通路中葡萄糖调节蛋白78(GRP78)、C/EBP同源蛋白(CHOP)、半胱氨酸天冬氨酸蛋白酶(caspase)12及caspase-3活性体蛋白表达。用原位末端转移酶标记(TUNEL)法检测肝脏细胞凋亡率。结果与对照组相比,伤后第1、4、7、14天大鼠肝脏GRP78表达均显著增高(分别为1.29±0.11比1.00±0.00、1.28±0.12比0.95±0.16、1.29±0.14比0.93±0.06、1.414-0.17比1.02±0.13);伤后第1、4天CHOP表达显著增高(分别为1.72±0.07比1.004-0.00、1.82±0.18比1.46±0.08);而伤后第1、4、7天caspase.12活性体和caspase-3活性体表达显著增高(分别为2.05±0.65比1.00±0.00、2.16±0.69比0.95±0.21、1.98±0.56比0.904-0.22和1.96±0.15比1.00±0.00、1.40±0.14比1.07±0.12、1.77±0.17比1.15±0.21);伤后第1、4、7、14天肝脏细胞凋亡率(%)均显著升高(分别为27.20±3.63比5.004-0.71、16.404-1.52比5.40±1.14、27.60±1.82比7.40±1.14、10.20±1.92比5.204-1.64);以上差异均有统计学意义(均P〈0.05)。结论严重烧伤后大鼠肝脏内质网应激反应激活,相关蛋白GRP78、CHOP、caspase一12及easpase-3活性体表达增加。Objective To explore the expression of endoplasmic reticulum stress (ERS) associated proteins in livers of severely burned rats and examine its potential significance. Methods Sixty-four Wistar rats were randomly divided into the control and burn groups (30% total body surface area full-thickness thermal injury) (n = 32 each). Livers were harvested at Day 1,4, 7, 14 post-burn. Western blot was used to detect the expressions of endoplasmic reticulum stress associated proteins glucose regulated protein 78 (GRP78), C/EBP-homologous protein (CHOP), active caspase-12 and active caspase-3. Hepatic apoptosis was assessed by the assay of terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL). Results Compared with the control group, the expression of GRP78 became elevated at Day 1, 4, 7, 14 post-burn (1.29 ±0. 11 vs 1.00 ±0. 00, 1.28 ±0. 12 vs 0. 95 ±0. 16, 1.29 ±0. 14 vs 0.93 ±0.06, 1.41 ±0. 17 vs 1.02 ±0. 13 respectively) ; the expression of CHOP was higher at Day 1, 4 ( 1.72 -0. 07 vs 1.00 ±0. 00, 1.82 ±0. 18 vs 1.46 ±0. 08 respectively) while active caspase-12 and active caspase-3 increased at Day 1, 4, 7 post-burn (2. 05 ±0. 65 vs 1.00 ±0. 00, 2. 16 ±0. 69 vs 0. 95 ±0. 21, 1.98 ±0. 56 vs 0.90±0. 22; 1.96±0. 15 vs 1.00 ±0.00, 1.40 ±0. 14 vs 1.07 ± 0. 12, 1.77 ±0. 17 vs 1.15 ±0. 21. respectively) ; the apoptotic index (%) of hepatocytes was higher at Day 1,4, 7, 14 post-burn (27.20 ±3.63 vs 5.00 ±0. 71, 16. 40 ± 1.52 vs 5.40 ± 1.14, 27.60 ± 1.82 vs 7.40 ± 1.14, 10. 20 ± 1.92 vs 5.20 ± 1.64 respectively). All results were statistically significant ( all P 〈 0. 05 ). Conclusion ERS activates and expressions of associated proteins GRP78, CHOP, active caspase-12 and active caspase-3increase in livers of severely burned rats.

关 键 词:烧伤 内质网 应激 肝细胞 细胞凋亡 

分 类 号:R644[医药卫生—外科学]

 

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