卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

卡巴胆碱对烧伤延迟复苏大鼠免疫功能的影响

Objective To explore the changing trend of Ia on monocyte, lymphocyte apoptosis rate, TNF-α and IL-6 in abdominal aorta of burned rats with delayed resuscitation and the influence of application of carbachol on them. Methods Adult male Wistar rats were randomly divided into normal control group(n =8), scald group(n =48) and scald with carbachol treatment group(n =48). In latter two groups, rats were inflicted with 30% total body surface area (TBSA) full-thickness scald and delayed fluid resuscitation. All scald rats were sacrificed at the 6th hours or 1st, 2nd, 3rd, 7th, 14th day after scald, with 8 rats at each time point. Expression of Ia antigen on monocyte and lymphocyte apoptosis rate were determined by direct immunofluorescence on a flow cytometer, and TNF-α and IL-6 was measured by ELISA. Results Expression of la on monocyte was obviously lower than that of controls. The lowest levels were recorded on the 6th hours and 1st day after scald. Subsequently, Ia was elevated gradually, but still lower than that of normal rats(P <0. 01). After administration of carbachol, Ia expression was obviously promoted, compared with the simple scald group (P <0. 01). Lymphocyte apoptosis rate, TNF-α and IL-6 was higher than that of controls(P <0. 01). After administration of cavachol, , lymphocyte apoptosis rate and TNF-α and IL-6 was obviously down-regulated on the 6th hours, 1st day, 2nd day and 3rd day after scald injury, compared with the simple scald group (P < 0. 01 or 0. 05). Conclusion After severe burn with delayed fluid resuscitation, there is a low la expression, high lymphocyte apoptosis rate and increased releasing of proinflammatory cytokine. Immune function was suppressed. Carbacho] could improve the immune function of scald rats with delayed fluid resuscitation.     

急性羰基镍中毒大鼠肺组织和细胞损伤的实验观察

目的 观察大鼠急性羰基镍中毒后肺细胞DNA损伤程度以及组织细胞病理变化。方法 SD大鼠静态分别吸人20、135和250 mg/m3羰基镍染毒30 min,另设250 mg/m3氯气染毒组和正常对照组在染毒后第1、2、3和7天取肺组织单细胞凝胶电泳试验检测肺细胞DNA损伤程度,同时观察大鼠肺组织病理变化和细胞超微结构改变。结果 不同浓度羰基镍染毒后不同时间,大鼠肺组织细胞均有损伤,以72 h DNA损伤最重,但损伤晚于氯气。不同浓度羰基镍染毒大鼠肺组织有炎性渗出和增生,部分细支气管破坏,黏膜坏死脱落;肺泡Ⅰ型细胞的细胞器肿胀,肺泡Ⅱ型细胞板层体减少且排空,胞质内空泡增多、线粒体肿胀,肺泡纵隔内胶原纤维增生。结论 急性羰基镍对大鼠肺组织细胞有明显的损伤作用,且存在剂量-效应关系和时间-效应关系。     

亚硒酸钠与核黄素联合暴露对高脂饮食大鼠血脂及血清肝生化指标的影响

目的研究亚硒酸钠与核黄素联合暴露对高脂饮食雄性大鼠血脂及血清肝生化指标的影响。方法将60只健康SPF级雄性SD大鼠按体重随机分为空白对照组(10只)和高脂组(50只),分别给予基础饲料和高脂饲料;喂养4周后,将50只高脂组大鼠按照血脂水平和体重随机分为5组,分别为高脂对照组、1.84μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组、18.40μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组、1.84μg/kg亚硒酸钠+3.50 mg/kg核黄素干预组和18.40μg/kg亚硒酸钠+3.50 mg/kg核黄素干预组,每组10只。采用灌胃方式进行染毒,同时,空白对照组和高脂对照组给予相同体积的生理盐水,染毒容量为10 ml/kg,每天1次,连续60 d。分别于第0(染毒前)、20、40、60天,测定大鼠血清中总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)和高密度脂蛋白胆固醇(HDL-C)水平;并于第60天,检测大鼠血清丙氨酸氨基转移酶(ALT)、天冬氨酸氨基转氨酶(AST)的水平。结果与空白对照组比较,染毒期间高脂对照组及各干预组大鼠血清TC、TG、LDL-C的水平均升高,除第60天时1.84μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组大鼠血清TG水平外,差异有统计学意义(P0.05);而血清HDL-C水平均未见显著变化。与高脂对照组相比,第20、40天时1.84μg/kg亚硒酸钠+0.70mg/kg核黄素干预组大鼠血清TC、TG的水平及1.84μg/kg亚硒酸钠+3.50 mg/kg核黄素干预组大鼠血清TG的水平以及第60天时1.84μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组大鼠血清TC、TG、LDL-C的水平及18.40μg/kg亚硒酸钠+0.70mg/kg核黄素干预组大鼠血清TC的水平均下降,差异有统计学意义(P0.05);而各干预组大鼠血清HDL的水平均无明显改变。与空白对照组比较,高脂对照组、18.40μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组和1.84μg/kg亚硒酸钠+3.50mg/kg核黄素干预组大鼠血清ALT的水平以及高脂对照组、18.40μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组和18.40μg/kg亚硒酸钠+3.50 mg/kg核黄素干预组大鼠血清AST的水平均升高,差异有统计学意义(P0.05)。与高脂对照组相比,仅1.84μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组大鼠血清ALT的水平降低,差异有统计学意义(P0.05);1.84μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组、18.40μg/kg亚硒酸钠+0.70 mg/kg核黄素干预组以及1.84μg/kg亚硒酸钠+3.50 mg/kg核黄素干预组大鼠血清AST的水平降低,差异均有统计学意义(P0.05)。结论适量亚硒酸钠与核黄素联合暴露可以拮抗高脂饮食所致雄性大鼠血脂及血清肝生化指标的升高。     

五味子乙素对染矽大鼠肺组织MAPKs和NF-κB信号转导通路的影响

目的 探讨五味子乙素(Sch-B)对SiO2致大鼠肺损伤过程中肺组织丝裂素活化蛋白激酶(MAPKs)和核因子-κΒ(nuclear factor-κΒ,NF-κΒ)信号转导通路的影响.方法 92只大鼠随机分为对照组(20只)、染尘组(30只)、Sch-B干预1组(24只)和Sch-B干预2组(18只).非暴露气管法建立大鼠矽肺模型,Sch-B干预1组造模后第1天起连续灌胃(80mg/kg Sch-B)21 d,Sch-B干预2组造模后第8天起连续灌胃(80mg/kg Sch-B)21 d.Sch-B干预1组在第3、7、14和21天,Sch-B干预2组在第14、21和28天随机取6只,在第3、7、14、21和28天随机取对照组4只,染尘组6只,处死取其肺组织.右肺用于蛋白质提取,通过免疫印迹(Western bloting)法测定肺组织MAPKs家族中细胞外信号调节蛋白激酶(ERK)、c-Jun氨基末端激酶(JNK)和p38的磷酸化水平;用免疫组化法测定NF-κΒ核转移率.结果 Sch-B干预1组第3、7、14和21天,Sch-B干预2组第21和28天肺组织ERK1/2磷酸化水平(0.974±0.169、0.987±0.149、0.920±0.092、0.884±0.078、1.167±0.083、1.002±0.060)均明显低于染尘组,差异均有统计学意义(P＜0.05或P＜0.01);Sch-B干预1组在第7天肺组织JNK1磷酸化水平达到最高峰后持续下降,与染尘组比较,差异有统计学意义(P＜0.01),而Sch-B干预2组第14、21和28天肺组织JNK1磷酸化水平(0.882±0.064、0.802±0.061、0.792±0.015)均低于染尘组,差异有统计学意义(P＜0.01);Sch-B干预1组第3天p38磷酸化水平为0.309±0.045,高于染尘组,Sch-B干预1组和2组第14天p38磷化水平为0.667±0.072和0.650±0.066,均明显低于染尘组,差异有统计学意义(P＜0.01).Sch-B干预1组大鼠肺组织第3、7、14和21天NF-κΒ核转移率为(13.54±5.36)%,(21.01±6.43)%,(30.55±6.44)%,(37.39±9.32)%,Sch-B干预2组第21天核转移率为(44.33±22.88)%,明显均低于染尘组,差异有统计学意义(P＜0.01),而在第28天Sch-B干预2组核转移率为(58.52±14.57)%,明显高于染尘组,差异有统计学意义(P＜0.01).结论 ch-B对SiO2诱导的肺组织损伤过程中MAPKs家族3个成员活化都有一定的抑制作用.在染矽初期给予Sch-B干预可抑制NF-κΒ活化.Sch-B对SiO2诱导的大鼠肺损伤保护作用可能通过MAPKs和NF-κΒ信号转导通路.     

纳米SiO2与标准SiO2对大鼠肺毒作用的比较研究

目的观察纳米SiO_2与标准SiO_2对大鼠的肺部毒性作用。方法72只雄性SD大鼠分为纳米SiO_2组、标准SiO_2组和对照组,每组24只。纳米SiO_2组或标准SiO_2组分别一次性气管注入纳米SiO_2或标准SiO_2颗粒悬浮液0.5 ml,分别观察3、7、14、28d后,各处死6只大鼠,测定肺泡灌洗液(BALF)中的白细胞总数和总蛋白含量;HE染色和胶原纤维(VG)染色进行病理观察。结果染尘3、7、14d纳米SiO_2组大鼠BALF中自细胞总数[(16.0±6.0)×10~6、(11.1±4.0)×10~6、(12.2±4.6)×10~6]明显高于对照组,差异有统计学意义(P<0.05或P<0.01),纳米SiO_2染尘3d时明显高于标准SiO_2组[(5.7±3.7)×10~6],差异有统计学意义(P<0.01)。染尘14、28d纳米SiO_2组大鼠BALF中总蛋白含量[(0.41±0.14,0.41±0.19)g/L]明显高于对照组和标准SiO_2组相应时间点的总蛋白含量,高于纳米SiO_2染尘3和7d时的总蛋白含量,差异均有统计学意义(P<0.05或P<0.01)。染尘3d时,纳米SiO_2组肺泡腔、支气管壁及血管壁周白细胞严重浸润,标准SiO_2组肺泡腔及血管壁周也有炎性浸润,但比纳米SiO_2组轻。两组VG染色均未见明显胶原纤维分布。结论在该实验条件下,纳米SiO_2引起大鼠早期肺部炎症反应比标准SiO_2严重,持续时间更长,引起肺部损害的颗粒负荷阈值可能比标准SiO_2低。     

结缔组织生长因子及α平滑肌肌动蛋白在百草枯致大鼠肺纤维化中的作用

目的 观察急性百草枯(PQ)中毒大鼠肺组织结缔组织生长因子(CTGF)及α平滑肌肌动蛋白(α-SMA)表达水平的变化,探讨PQ致肺纤维化的机制.方法 SD大鼠随机分为对照组(生理盐水)和染毒组(PQ).染毒组给予生理盐水稀释的PQ(80 mg/kg)一次性灌胃,对照组给予生理盐水1ml/kg一次性灌胃.于不同处理后1、3、7、14、28、56 d分别以免疫组化(SABC)法检测大鼠肺组织中CTGF及α-SMA的表达强度和定位;免疫印迹(Western blot)法检测肺组织中CTGF及α-SMA蛋白的表达水平;初步分析两者表达的相关性及其表达与肺组织纤维化指标的相关性;同时观察中毒大鼠的肺组织病理变化.结果 与对照组比较,免疫组化和Western blot法检测染毒后大鼠肺组织中CTGF、α-SMA的表达变化规律较为一致,均随时间延长而逐渐升高,3、7 d时升高幅度缓慢,14～56d时增幅较大,各时段均明显高于对照组,差异有统计学意义(P＜0.05或P＜0.01).CTGF与α-SMA、病理评分及羟脯氨酸含量均呈正相关(r=0.74,r=0.87,r=0.71,P＜0.05或P＜0.01).病理学Masson染色可见大鼠肺组织中14～28 d时成纤维细胞大量增殖,胶原纤维数量逐渐增多.结论 在染毒大鼠肺组织中CTGF及α-SMA的表达持续增高;CTGF可能通过促使肺成纤维细胞向肌成纤维细胞转化,增加胶原分泌和基质合成,在PQ所致肺纤维化的发生发展中起重要作用.     

新型超细晶铜材料植入大鼠子宫中Cu2+释放及对子宫组织的影响

目的:研究新型超细晶铜材料与普通铜材料植入大鼠子宫腔的Cu2+释放以及对子宫形态的影响。方法:将普通铜材料(对照组)和新型超细晶铜材料(实验组)铜丝,分别植入12周龄雌性Wistar大鼠左侧子宫,右侧未植入子宫为自身对照。分别在12 h、1 d、3 d、7 d、15 d和30 d处死大鼠,收集外周血清、宫腔灌洗液、子宫和肝脏组织,用电感耦合等离子体原子发射光谱仪(ICP)测定样本中Cu2+的含量,并对子宫组织行常规组织形态学分析。结果:宫腔植入铜材料后,与对照组相比,实验组大鼠血清及肝脏组织中的Cu2+浓度无差异。两组宫腔灌洗液中Cu2+浓度在植入3d时最高,7d、15d时降低且实验组低于对照组(P<0.05);两组子宫组织Cu2+浓度在植入12 h时最高,植入1d、3d时降低(P<0.05),随后趋于平稳,且植入7d、15d时实验组Cu2+浓度低于对照组(P<0.05)。两组子宫组织在植入早期表现为急性无菌性炎症,但实验组组织损伤修复显示更快。结论:新型超细晶铜材料作为宫内节育器新材料,能够在时间和程度上显著降低Cu2+暴释现象,有望成为替代现有铜材料的重要选择。     

血液灌流对百草枯急性中毒兔血药浓度及组织病理学的影响

目的 观察百草枯(PQ)急性中毒日本大耳白兔血液灌流后血药浓度及组织病理学改变.方法 16只日本大耳白兔随机分为PQ中毒组(8只)及血液灌流治疗组(8只),两组动物以PQ 50 mg/kg染毒,染毒后45 min左右予血液灌流治疗,两组均在不同处理后0.5、1.0、1.5、2.0、3.0、6.0、12.0、24.0、4...     

重组人促红细胞生成素对宫内炎症致新生大鼠脑损伤髓鞘少突细胞糖蛋白表达变化与髓鞘修复关系的研究

目的 通过观察新生大鼠脑组织内髓鞘少突细胞糖蛋白(MOG) mRNA及MOG蛋白动态变化情况,探讨重组人促红细胞生成素(rhEPO)与宫内炎症致脑组织髓鞘损伤、修复的关系,为临床干预新生儿脑白质损伤提供依据。方法 1)选取孕15 d的Wistar大鼠分别经腹腔注射脂多糖及无菌生理盐水后分为脂多糖感染组和对照组,随机选取感染组经苏木素-伊红染色证实胎盘和新生大鼠脑组织存在炎性损伤的同胎新生大鼠64只,分为rhEPO治疗组和感染对照组,随机选取对照组中新生大鼠32只为空白对照组,分别于生后每日腹腔注射rhEPO(5 000 U/kg)或等量生理盐水。2)三组新生大鼠均分别于生后当日、3 d、7 d及14 d行左心室甲醛灌注取脑组织,利用RT-PCR检测脑组织中MOG mRNA,Western blot检测MOG蛋白水平变化。结果 1)空白对照组MOG mRNA水平在3 d[(2.05±0.75)倍]、7 d[(2.37±0.57)倍]及14 d[(3.36±0.81)倍]新生大鼠脑组织中均较当日组[(1.01±0.16)倍]明显升高,差异有统计学意义(P＜0.05);2) 感染对照组MOG mRNA水平在当日、3 d、7 d及14 d新生大鼠脑组织中均较同日龄空白对照组下降,且3 d和7 d组差异具有统计学意义(P＜0.05);3)rhEPO治疗组3 d[(2.18±0.89)倍]、7 d[(3.53±1.55)倍]及14 d[(3.30±1.12)倍]新生大鼠脑组织MOG mRNA水平较同日龄感染对照组均显著上升,差异有统计学意义(P＜0.05);4)rhEPO治疗组MOG蛋白水平在3 d(12.63±0.65 vs. 18.23±0.37)、7 d(13.59±1.10 vs. 22.72±2.77)及14 d(15.63±1.32 vs. 25.85±2.70)时均低于感染对照组,差异有统计学意义(P＜0.05)。结论 宫内炎症致新生大鼠脑组织损害中存在通过抑制髓鞘MOG基因及蛋白表达的机制。早期应用rhEPO能够促进MOG基因及蛋白表达发挥神经修复保护作用,14 d的疗程目前为最佳疗程。     

依达拉奉对重型颅脑损伤患者急性期外周血神经元特异性烯醇化酶表达的影响

目的 通过研究依达拉奉对重型颅脑损伤患者急性期外周血神经元特异性烯醇化酶(NSE)表达的影响,进一步研究依达拉奉对重型颅脑损伤患者急性期的治疗效果.方法 将入选的60例重型颅脑损伤患者随机分为治疗组和对照组,每组各30例.治疗组在基础治疗的同时加用依达拉奉治疗,对照组除不加用依达拉奉外其他治疗方法同治疗组.两组治疗前、治疗后1、3、5、7 d清晨7时抽取外周静脉血测NSE水平.结果 治疗组和对照组治疗前NSE水平分别为(48.73±30.46)μg/L和(40.86±22.05)μg/L,两组间比较差异无统计学意义(P＞0.05),治疗后3、5、7 d,两组NSE水平分别为(34.16±15.08)、(29.86±12.61)、(29.93±14.77)μg/L和(27.42±10.07)、(22.33±8.93)、(21.17±9.67)μg/L,组内和组间比较差异均有统计学意义(P＜0.05或＜0.01).而且随着治疗时间的延长,NSE水平进行性下降.两组用药期间未见有任何药物不良反应.结论 依达拉奉对重型颅脑损伤患者急性期外周血NSE表达的影响非常显著,对重型颅脑损伤患者急性期有较好的治疗效果,且用药安全,不良反应少.     

弹性蛋白在高氧致新生鼠慢性肺疾病中的表达及其作用

目的研究弹性蛋白在高氧致新生鼠慢性肺疾病中的表达及其作用。方法将足月新生大鼠144只随机分为高氧组和空气组，分别于实验1d，3d，7d，10d，14d和21d应用弹力纤维染色、原位杂交技术分别检测secondary crest定量、tropoelastinmRNA表达。结果高氧组在3～14dsecondary crest与空气组相比较明显降低（P〈0．05）；高氧组在3～10d tropoelastin mRNA表达与空气组相比较明显降低（P〈0．05），14d和21d tropoelastin mRNA表达与空气组相比较明显增加（P〈0．05），弹性蛋白原合成的高峰滞后。结论弹性蛋白参与CLD肺泡发育受阻和肺纤维化的发生。