中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (17): 2680-2685.doi: 10.3969/j.issn.2095-4344.2591

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

地塞米松联合雌激素干预脊髓钝挫伤大鼠白细胞介素6、Caspase3和Bcl-2的表达

李沁轩,王一枝,徐  艳,张华阳,吕奇璇,张  程,何正云,张  晓,杨  拯   

  1. 成都医学院基础医学院实验教学中心,四川省成都市  610500
  • 收稿日期:2019-08-12 修回日期:2019-08-14 接受日期:2019-09-17 出版日期:2020-06-18 发布日期:2020-03-28
  • 通讯作者: 徐艳,硕士,主治医师,成都医学院基础医学实验教学中心,四川省成都市 610500
  • 作者简介:李沁轩,男,2000年生,四川省中江县人,汉族,本科在读,主要从事脊髓损伤相关方面研究。
  • 基金资助:
    国家级大学生创新实验训练计划项目(201613705035)

Effects of dexamethasone combined with estrogen on the expression of interleukin-6, Caspase3 and Bcl-2 after spinal cord contusion in rats  

Li Qinxuan, Wang Yizhi, Xu Yan, Zhang Huayang, Lü Qixuan, Zhang Cheng, He Zhengyun, Zhang Xiao, Yang Zheng   

  1. Experiment Technology Center of Chengdu Medical College School of Basic Medical Sciences, Chengdu 610500, Sichuan Province, China
  • Received:2019-08-12 Revised:2019-08-14 Accepted:2019-09-17 Online:2020-06-18 Published:2020-03-28
  • Contact: Xu Yan, Master, Attending physician, Experiment Technology Center of Chengdu Medical College School of Basic Medical Sciences, Chengdu 610500, Sichuan Province, China
  • About author:Li Qinxuan, Experiment Technology Center of Chengdu Medical College School of Basic Medical Sciences, Chengdu 610500, Sichuan Province, China
  • Supported by:
    the National Undergraduate Innovation Experimental Training Program of China, No. 201613705035

摘要:

文题释义:

生物信息学分析:生物信息学是随着生命科学和计算机科学迅猛发展的一门学科,以计算机为工具对生物信息进行储存、检索和分析的科学。该研究使用常用工具Gene MAIN对白细胞介素6、Caspase3和Bcl-2的相关性进行分析,结果显示Bcl-2通过Csf3(细胞集落刺激因子)与Caspase3存在联系,并且Caspase3通过Atf3(细胞转录因子)可与白细胞介素6建立联系。Csf3等中间因子可能就是药物协同抵消负性作用的关键位点。

联合用药:主要是为了增加药物的疗效或为了减轻药物的毒副作用。该研究所聚焦的雌激素和地塞米松都具有一定的毒副作用,雌激素具有较好的抗凋亡作用,但在术后的抗感染阶段可过度激活炎症反应;地塞米松则能够有效缓解炎症反应的发生,减少脊髓损伤部位炎细胞数量。因此两者联合可以较好地避免负性效应,增强正性的治疗作用。

背景:临床药物单独使用对脊髓损伤特定病理变化具有较好地阻断作用,但单一用药往往存在较为复杂的不良反应,如雌激素可以缓解氧化损伤导致的细胞凋亡,但同时会激活体内的炎症反应。在此大背景下,联合协同用药成为临床创新发展的趋势,其联合用药机制也迫切需要阐明。

目的:探究地塞米松联合雌激素治疗对脊髓钝挫伤大鼠白细胞介素6、Caspase3和Bcl-2表达的影响。

方法:雌性4周龄SD大鼠48只,随机分为假手术组、生理盐水组、地塞米松组、联合治疗组,每组12只。假手术组显露脊髓后直接缝合,其他3组采用改良Allen’s法建立脊髓损伤模型,术后30 min和1,2,3,4,5 d时假手术组和生理盐水组大鼠注射生理盐水(0.2 mL/kg),地塞米松组大鼠注射地塞米松(0.2 mg/kg),联合治疗组大鼠先后注射雌二醇(0.04 mg/kg)、地塞米松(0.2 mg/kg),注射部位均为大鼠前肢大腿外侧肌。术后    14 d内采用BBB评分观察大鼠后肢运动功能恢复情况,术后3,7,21 d采用免疫组织化学检测脊髓组织中白细胞介素6、Bcl-2和Caspase3的表达。

结果与结论:①联合治疗组运动功能恢复开始时间较地塞米松组和生理盐水组更早,在整个恢复时期,联合治疗组的BBB评分显著高于地塞米松组(P < 0.05);②与地塞米松组相比,联合治疗组白细胞介素6和Casepase3表达显著降低、Bcl-2 表达明显升高(P < 0.05);③结果表明,联合治疗能有效减少脊髓损伤后促凋亡因子Caspase3和促炎因子白细胞介素6的表达,增加抗凋亡因子Bcl-2的表达,通过抑制凋亡和炎症促进脊髓损伤后功能恢复。

ORCID: 0000-0003-1454-5207(李沁轩)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程

关键词: 脊髓损伤, 地塞米松, 雌二醇, 白细胞介素6, Caspase3, Bcl-2

Abstract:

BACKGROUND: The clinical use of drugs alone can well block specific pathological changes after spinal cord injury, but single medications often result in complicated adverse reactions. For example, estrogen can alleviate apoptosis caused by oxidative damage, but it can also activate inflammation. Therefore, the combined use of drugs has become a clinical treatment trend, and the mechanism of combined use is urgently needed to be clarified.

OBJECTIVE: To investigate the therapeutic effect of dexamethasone combined with estrogen treatment on the expression of interleukin-6, Caspase3 and Bcl-2 in rats post spinal cord contusion.

METHODS: Forty-eight female Sprague-Dawley rats aged 4 weeks were randomly assigned to the following groups (n=12 per group): sham surgery group, normal saline group, dexamethasone group, combined treatment (dexamethasone and estrogen) group. The spinal cord contusion model was established by modified Allen’s method in all groups except for the sham surgery group. Rats in the sham surgery group and normal saline group were injected normal saline (0.2 mL/kg) at the lateral thigh muscle, those in the dexamethasone group were given dexamethasone (0.2 mg/kg), and those in the combined treatment group were treated with estrogen (0.04 mg/kg) and dexamethasone (0.2 mg/kg) at 30 minutes, 1, 2, 3, 4, and 5 days post-operation. Basso, Beattie and Bresnahan scoring was applied to evaluate the hindlimb motor functional recovery within 14 days post-operation. Expression of interleukin-6, Bcl-2 and Caspase3 was detected using immunohistochemistry at 3, 7, and 21 days post-operation.

RESULTS AND CONCLUSION: The motor function of combined treatment group recovered earlier than that of dexamethasone group and normal saline group. Furthermore, during the whole recovery period, the Basso, Beattie and Bresnahan scores in the combined treatment group were significantly higher than those in the dexamethasone group (P < 0.05). The immunohistochemical results also indicated that the expression of interleukin-6 and Casepase3 in the combined treatment group was significantly lower than that in the dexamethasone group, and the expression of Bcl-2 was significantly increased in the recovery period (P < 0.05). To conclude, the combined treatment of dexamethasone and estrogen can effectively reduce the expression of proapoptotic factor Caspase3 and proinflammatory factor interleukin-6, and increase anti-apoptotic factor Bcl-2 to further promote functional recovery in rats after spinal cord contusion by impeding apoptosis and inflammation. 

Key words: spinal cord injury, dexamethasone, estrogen, interleukin-6, Caspase3, Bcl-2

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