荷负电气溶胶治疗对大鼠烫伤创面白细胞介素-8、10表达的影响及意义

Objective To discuss the influence of aerosol bioelectricity on the expression of interleukin (IL) -8 and IL-10 in wound healing of burned rats. Methods The deep Ⅱ degree scalding models were established in Sprague Dawley (SD) rats. Rats were randomly divided into experimental group (n1 =20) and control group (n2 =20). The rats in experimental group were treated with aerosol bioelectricity.Samples were collected at the first to eleventh day post-scalding. Immunohistochemistry and image analysis methods were conducted to examine the expression of IL-8 and IL-10 in both experimental and control groups. Results The average wound healing time in experimental group was 7. 00 ± 1. 15 days, and that in control group was 9. 00 ± 1. 34 days. IL-8 and IL-10 were observed mainly in polylmorphonuclear and mononuclear cells in both experimental and control groups on the 1 st day. On the third day, fibroblasts abounded, IL-8 expression was increased evidently and reached a peak. The peak value (6. 73 ± 1. 36) in experimental group was lower significantly than that in control group ( 2. 85 ± 0. 72, P ＜ 0. 01). From the 5th to 11th day, IL-8 expression was declined rapidly. IL-10 was expressed in keratode cells and had the peak value in experimental group (1. 24 ±0. 15) and control group (5. 69 ± 1. 32) on the 3rd day. IL-10 expression was declined gradually from the 5th to 11th days. The expression level of IL-10 in experimental group was significantly higher than in control group from the 3rd day to 11th days post-scalding (P＜0. 01). On the 3rd day, both IL-8 and IL-10 in experimental and control groups were expressed abundantly , and there was negative relationship between them (r = - 0. 862, P ＜ 0. 01). Conclusion Aerosol bioelectricity can indicate active cells proliferation through down-regulating the expression of IL-8 and up-regulating the expression of IL-10, accelerating burned wound healing.     

荷负电气溶胶治疗对大鼠烫伤创面白细胞介素-8、10表达的影响及意义

Objective To discuss the influence of aerosol bioelectricity on the expression of interleukin (IL) -8 and IL-10 in wound healing of burned rats. Methods The deep Ⅱ degree scalding models were established in Sprague Dawley (SD) rats. Rats were randomly divided into experimental group (n1 =20) and control group (n2 =20). The rats in experimental group were treated with aerosol bioelectricity.Samples were collected at the first to eleventh day post-scalding. Immunohistochemistry and image analysis methods were conducted to examine the expression of IL-8 and IL-10 in both experimental and control groups. Results The average wound healing time in experimental group was 7. 00 ± 1. 15 days, and that in control group was 9. 00 ± 1. 34 days. IL-8 and IL-10 were observed mainly in polylmorphonuclear and mononuclear cells in both experimental and control groups on the 1 st day. On the third day, fibroblasts abounded, IL-8 expression was increased evidently and reached a peak. The peak value (6. 73 ± 1. 36) in experimental group was lower significantly than that in control group ( 2. 85 ± 0. 72, P ＜ 0. 01). From the 5th to 11th day, IL-8 expression was declined rapidly. IL-10 was expressed in keratode cells and had the peak value in experimental group (1. 24 ±0. 15) and control group (5. 69 ± 1. 32) on the 3rd day. IL-10 expression was declined gradually from the 5th to 11th days. The expression level of IL-10 in experimental group was significantly higher than in control group from the 3rd day to 11th days post-scalding (P＜0. 01). On the 3rd day, both IL-8 and IL-10 in experimental and control groups were expressed abundantly , and there was negative relationship between them (r = - 0. 862, P ＜ 0. 01). Conclusion Aerosol bioelectricity can indicate active cells proliferation through down-regulating the expression of IL-8 and up-regulating the expression of IL-10, accelerating burned wound healing.     

皮神经营养血管对扩大穿支蒂皮瓣存活面积的实验研究

Objective To study the effects of nerocutneous vessels on perforator flap blood supply and survival area. Methods Thirty SD rats were randomly divided into 3 groups. The study of the vasculature and nerve disposition of rat dorsum was performed with 10 rats of one group. According to the study,a distal rectangle neurocutaneous flap based on deep circumflex iliac artery perforator, 10 cm long and 3 cm in the width, was elevated on the rest rats, and sutured back to the original situation. The axis of the experimental group's flap paralleles the posterior median line,while the control group flap's angulated about 30° with it. The blood flow of the flap was assessed by fluorescein angiography on the 1st and 7th day after surgery. The surviving rate and the capillary density of flap were assessed on the 7th day after surgery. Results The rat deep circumflex iliac perforator artery was a constant perforator artery, with an nutrition area about 4 cm× 3 cm. The dorsal cutaneous nerves run along the dorsomedian line, nourished by rich vessels. The blood perfusion 1st day after surgery was 42.85% in the experimental group, 37.94% in the control group(P ＞ 0.01 ).On the 7th day, it was 84.07% in the experimental group, 58.55% in the control group (P＜ 0.01). The mean survival rate of the experimental group was 83.93%, higher than control group's 59.95% (P＜0.01),and the density of the blood vessels was higher in experimental group than control group's. Conclusion The neurocutaneous vessels can improve the flap survival condition, which make the perforator flap bigger and safer.     

皮神经营养血管对扩大穿支蒂皮瓣存活面积的实验研究

Objective To study the effects of nerocutneous vessels on perforator flap blood supply and survival area. Methods Thirty SD rats were randomly divided into 3 groups. The study of the vasculature and nerve disposition of rat dorsum was performed with 10 rats of one group. According to the study,a distal rectangle neurocutaneous flap based on deep circumflex iliac artery perforator, 10 cm long and 3 cm in the width, was elevated on the rest rats, and sutured back to the original situation. The axis of the experimental group's flap paralleles the posterior median line,while the control group flap's angulated about 30° with it. The blood flow of the flap was assessed by fluorescein angiography on the 1st and 7th day after surgery. The surviving rate and the capillary density of flap were assessed on the 7th day after surgery. Results The rat deep circumflex iliac perforator artery was a constant perforator artery, with an nutrition area about 4 cm× 3 cm. The dorsal cutaneous nerves run along the dorsomedian line, nourished by rich vessels. The blood perfusion 1st day after surgery was 42.85% in the experimental group, 37.94% in the control group(P ＞ 0.01 ).On the 7th day, it was 84.07% in the experimental group, 58.55% in the control group (P＜ 0.01). The mean survival rate of the experimental group was 83.93%, higher than control group's 59.95% (P＜0.01),and the density of the blood vessels was higher in experimental group than control group's. Conclusion The neurocutaneous vessels can improve the flap survival condition, which make the perforator flap bigger and safer.     

荷负电气溶胶治疗对大鼠烫伤创面白细胞介素-8、10表达的影响及意义

目的 观察荷负电气溶胶治疗对大鼠烫伤创面愈合过程中白细胞介素(IL)-8、IL-10表达的影响,探讨荷负电气溶胶治疗促进创面愈合的作用机制.方法 制作SD大鼠深Ⅱ度烫伤模型,采用分组对照方法,将40只鼠随机分为治疗组(n1=20)和对照组(n2=20).治疗组应用荷负电气溶胶治疗,每次1.5 h,每天2次,直至创面愈合;对照组不作荷负电气溶胶治疗.伤后第1～11天分别取创面标本制作切片,采用免疫组织化学和图像分析方法,检测创面愈合过程中IL-8和IL-10表达水平.结果 创面平均愈合时间治疗组为(7.00±1.15)d,对照组为(9.00±1.34)d,治疗组创面愈合时间明显提前(P＜0.01).免疫组织化学显示,两组IL-8均在伤后第1天开始表达.主要位于多核粒细胞和单核细胞;第3天表达明显增多达高峰,并见大量成纤维细胞表达,治疗组的峰值明显低于对照组,差异有统计学意义(P＜0.01),第5～11天表达水平迅速下降.两组IL-10伤后第1天在淋巴细胞和单核细胞均有表达;第3天开始有角质细胞表达并达高峰,第5～11天表达水平缓慢下降,但治疗组要明显高于对照组,第3～11天差异有统计学意义(P＜0.01).结论 荷负电气溶胶治疗能有效抑制创面IL-8的表达及促进IL-10的表达,缩短炎症进程,从而加速创面愈合.

Abstract：

Objective To discuss the influence of aerosol bioelectricity on the expression of interleukin (IL) -8 and IL-10 in wound healing of burned rats. Methods The deep Ⅱ degree scalding models were established in Sprague Dawley (SD) rats. Rats were randomly divided into experimental group (n1 =20) and control group (n2 =20). The rats in experimental group were treated with aerosol bioelectricity.Samples were collected at the first to eleventh day post-scalding. Immunohistochemistry and image analysis methods were conducted to examine the expression of IL-8 and IL-10 in both experimental and control groups. Results The average wound healing time in experimental group was 7. 00 ± 1. 15 days, and that in control group was 9. 00 ± 1. 34 days. IL-8 and IL-10 were observed mainly in polylmorphonuclear and mononuclear cells in both experimental and control groups on the 1 st day. On the third day, fibroblasts abounded, IL-8 expression was increased evidently and reached a peak. The peak value (6. 73 ± 1. 36) in experimental group was lower significantly than that in control group ( 2. 85 ± 0. 72, P ＜ 0. 01). From the 5th to 11th day, IL-8 expression was declined rapidly. IL-10 was expressed in keratode cells and had the peak value in experimental group (1. 24 ±0. 15) and control group (5. 69 ± 1. 32) on the 3rd day. IL-10 expression was declined gradually from the 5th to 11th days. The expression level of IL-10 in experimental group was significantly higher than in control group from the 3rd day to 11th days post-scalding (P＜0. 01). On the 3rd day, both IL-8 and IL-10 in experimental and control groups were expressed abundantly , and there was negative relationship between them (r = - 0. 862, P ＜ 0. 01). Conclusion Aerosol bioelectricity can indicate active cells proliferation through down-regulating the expression of IL-8 and up-regulating the expression of IL-10, accelerating burned wound healing.     

曲尼司特对环孢素A诱导的人肾小管上皮细胞向间充质转变的抑制作用

Objective To study the effect of tranilast on cyclosporine A (CsA)-induced epithelial-to-mesenchymal transition in human renal tubular epithelial cells, and investigate the mechanism of its antifibrotic effect. Methods Cultured HK-2 cells were divided into four groups: (1)In the control group, cells were treated without any medicine; (2) The cell were treated with CsA (4. 2μmol/L) for 72 h; (3) The cells were treated with a combination of CsA (4. 2 μmol/L) and tranilast (100μmol/L); (4) The cells were treated with tranilast (100 μmol/L) alone for 72 h.Morphological changes of the cells were assessed by phase-contrast microscopy. The immunofluorescence and Western blotting were adopted to detect the expression of E-cadherin, α-SMA and OPN mRNA and proteins respectively. Results Tranilast could markedly ameliorate the morphological changes of HK-2 cells stimulated by CsA. The irmmunofluorescence staining revealed the expression of E-cadherin was markedly decreased in HK-2 cells stimulated with CsA for 72 as compared with the control group, while the expression of α-SMA and OPN was significantly higher in CsA group than the control group. The expression of E-cadherin in the CsA + Tranilast group was higher than the CsA group, while the expression of α-SMA and OPN in the CsA + Tranilast group was lower than the CsA group. Western blotting showed that protein expression level of E-cadherin in CsA group was dramatically lower than that in the control group (P＜0. 05), while that of α-SMA and OPN in CsA group was significantly higher than in the control group (P＜0.05). The protein expression level of E-cadherin in HK-2 cells in the CsA + Tranilast group was markedly higher than in the CsA group (P＜0.05), and that of α-SMA and OPN in CsA + Tranilast group was significantly lower than in the CsA group (P＜0. 05). Conclusion Tranilast can block the CsA-induced epithelialto-mesenchymal transition in HK-2 cells probably by suppressing the expression of OPN.     

曲尼司特对环孢素A诱导的人肾小管上皮细胞向间充质转变的抑制作用

Objective To study the effect of tranilast on cyclosporine A (CsA)-induced epithelial-to-mesenchymal transition in human renal tubular epithelial cells, and investigate the mechanism of its antifibrotic effect. Methods Cultured HK-2 cells were divided into four groups: (1)In the control group, cells were treated without any medicine; (2) The cell were treated with CsA (4. 2μmol/L) for 72 h; (3) The cells were treated with a combination of CsA (4. 2 μmol/L) and tranilast (100μmol/L); (4) The cells were treated with tranilast (100 μmol/L) alone for 72 h.Morphological changes of the cells were assessed by phase-contrast microscopy. The immunofluorescence and Western blotting were adopted to detect the expression of E-cadherin, α-SMA and OPN mRNA and proteins respectively. Results Tranilast could markedly ameliorate the morphological changes of HK-2 cells stimulated by CsA. The irmmunofluorescence staining revealed the expression of E-cadherin was markedly decreased in HK-2 cells stimulated with CsA for 72 as compared with the control group, while the expression of α-SMA and OPN was significantly higher in CsA group than the control group. The expression of E-cadherin in the CsA + Tranilast group was higher than the CsA group, while the expression of α-SMA and OPN in the CsA + Tranilast group was lower than the CsA group. Western blotting showed that protein expression level of E-cadherin in CsA group was dramatically lower than that in the control group (P＜0. 05), while that of α-SMA and OPN in CsA group was significantly higher than in the control group (P＜0.05). The protein expression level of E-cadherin in HK-2 cells in the CsA + Tranilast group was markedly higher than in the CsA group (P＜0.05), and that of α-SMA and OPN in CsA + Tranilast group was significantly lower than in the CsA group (P＜0. 05). Conclusion Tranilast can block the CsA-induced epithelialto-mesenchymal transition in HK-2 cells probably by suppressing the expression of OPN.     

髓鞘相关蛋白抗体对大鼠脊髓损伤早期bcl-2与bax表达的影响

目的 探讨髓鞘相关蛋白(Nogo-A)抗体应用于脊髓损伤动物模型中对bcl-2与bax表达的影响.方法 建立大鼠急性脊髓损伤实验动物模型.180只大鼠随机分成对照组、损伤组和损伤后Nogo-A抗体治疗组,每组各60只.不同时间点损伤节段脊髓取材,分别行苏木素-伊红(HE)染色、免疫组织化学法检测bcl-2、bax表达并进行定量分析.结果 HE染色后光镜下观察:损伤后治疗组出血、小胶质细胞增生和炎细胞浸润均较损伤组轻.bcl-2、bax在损伤组和治疗组表达呈现动态变化,损伤后24 h bcl-2表达达高峰(3组分别为0.1004±0.0091、0.1890±0.0100、0.2456±0.0179,F=197.541,P＜0.01);损伤后8 h bax表达达高峰(3组分别为0.1084±0.0041、0.3440±0.0070、0.2472±0.0071,F=1856.199,P＜0.01);3组各时间点的图像分析结果 经单因素方差分析,差异有统计学意义(P＜0.05),治疗组和损伤组比较,bcl-2表达增强而bax表达减弱.结论 Nogo-A抗体治疗脊髓损伤能抑制bax表达,促进bcl-2表达,减轻脊髓继发性损伤.     

受体诱导一氧化碳经PI3 K/Akt信号途径抑制冷缺血再灌注诱导的移植心细胞凋亡

目的 观察受体诱导一氧化碳(CO)对移植心冷缺血再灌注(I/R)损伤中细胞凋亡的影响,并探讨其机制.方法 以BALB/C小鼠建立同系移植心冷I/R损伤模型.受体麻醉前3 h以二氯甲烷(MC)500 mg/kg灌胃诱导CO(MC组,n=12),或橄榄油灌胃(IR组,n=12);在MC组的基础上受体在移植心恢复血供前1 h腹腔注射PI3K抑制剂LY294002(40 mg/kg,LY组,n=10)或二甲亚砜(DMSO组,n=10);检测移植后3、24 h移植心细胞凋亡指数(AI)、磷酸化Akt(p-Akt)蛋白、bcl-2与bax蛋白表达比值;设正常对照组(N组,n=5).结果 受体以MC灌胃后血液中碳氧血红蛋白(COHb)浓度与心肌组织CO含量均在3 h达到峰值,分别为(9.82±0.84)%和(2.25±0.08)pmol/mg;与IR组比较,MC组明显降低移植心AI[3 h:(8.65±2.01)%比(19.28±4.94)%,P＜0.01;24 h:(5.82±2.36)%比(10.54±3.66)%,P＜0.05]、激活Akt蛋白(3 h:P＜0.01;24 h:P＜0.05)、上调bcl-2/bax比值(3 h:1.97±0.16比0.46±0.07,P＜0.01;24 h:1.89±0.10比0.51±0.04,P＜0.01);与MC组比较,LY组明显增加AI[3 h:(17.95±4.92)%,P＜0.01;24 h:(9.75±3.14)%;P＜0.01]、抑制Akt蛋白激活(P＜0.01)、下调bcl-2/bax比值(3 h:0.47±0.06,P＜0.01;24 h:0.52±0.03,P＜0.01);DMSO组与MC组的各个指标差异无统计学意义(P＞0.05).结论 受体诱导C0能明显抑制冷I/R诱导的移植心细胞凋亡,其机制可能与通过PI3K/Akt信号途径上调bcl-2/bax比值有关.     

颅脑损伤后海马区notch信号分子及其相关miRNA的表达变化

目的 观察颅脑损伤后海马区notch1相关微小RNA(miRNA)、notch1及nestin的表达变化,探讨颅脑损伤后神经干细胞增殖机制.方法 采用自由落体法复制闭合性颅脑损伤小鼠模型,于伤后4 h、1 d和3 d处死动物.(1)实时聚合酶链反应(Real-time PCR)检测伤后4 h、1 d和3d伤侧海马区mir-326、mir-34a和notch1 mRNA的表达变化.(2)免疫荧光染色检测伤后3 d伤侧海马齿状回区notch1和nestin蛋白表达变化.结果 (1)颅脑损伤后4 h、1 d和3 d组海马区mir-326和mir-34a表达水平分别为假手术组的(0.36±0.16)、(0.16±0.04)、(0.36±0.17)倍和(0.48±0.15)、(0.50±0.04)、(0.25±0.14)倍,均低于假手术组(P＜0.01);(2)颅脑损伤后4 h、1 d和3 d组海马区notch1 mRNA表达水平分别为假手术组的(1.77±0.17)、(2.55±0.48)和(2.44±0.58)倍,均高于假手术组(P＜0.05);颅脑损伤后3 d组海马齿状回区notch1阳性细胞明显多于假手术组[(18.20±3.56)个比(0.40±0.55)个,P＜0.01].(3)颅脑损伤后3 d组海马齿状回区nestin阳性细胞数明显高于假手术组[(21.80±5.07)个比(0.80±0.45)个,P＜0.01].结论 在颅脑损伤后海马区神经干细胞增殖过程中,mir-326和mir-34a表达明显降低,其靶基因notch1 mRNA和蛋白表达明显升高,提示mir-326和mir-34a可靶向抑制notch信号分子,调控伤后神经干细胞增殖过程.

Abstract：

Objective To observe the expression of notch1-related miRNA, notch1 and nestin,and explore the regulatory mechanism of neural stem cells proliferation in hippocampus of mice after traumatic brain injury (TBI). Methods Mice were suffered closed head injury, and then sacrificed at 4th h,1st day and 3rd day post-injury. Real-time polymerase chain reaction (PCR) was used to detect the expression levels of mir-326, mir-34a and notch1 mRNA in mice hippocampus at 4th h, 1st day and 3rd day post TBI. Immunofluorescence was conducted to determine protein expression levels of notch1 and nestin in mice hippocampus at 3rd day post TBI. Results ( 1 ) Relative to sham group, the levels of mir-326 and mir-34a at 4th h, 1st day and 3rd day after TBI in the hippocampus were respectively (0. 36 ± 0. 16),(0. 16±0.04), (0.36±0. 17) and (0.48±0. 15), (0.50±0.04), (0.25 ±0. 14) fold (P＜0.01);(2) Relative to sham group, the levels of notch1 mRNA at 4th h, 1st day and 3rd day post TBI injury in the hippocampus were respectively (1.77 ±0. 17), (2.55 ±0.48) and (2.44±0.58) fold (P＜0.05).Notch1 + cells in the DG at 3rd day post TBI were significantly increased compared to sham group ( 18.20± 3.56 vs 0. 40 ±0. 55 ,P ＜0. 01 ); (3) Nestin + cells in the DG at 3rd day post TBI were increased apparently compared to sham group (21.80 ± 5. 07 vs 0.80 ± 0. 45, P ＜ 0. 01 ). Conclusion mir-326 and mir-34a may play a key role in trauma-induced neural stem cells proliferation in hippocampus in vivo by targeting notch1 signaling.     

灯盏细辛对大鼠肾冷缺血再灌注损伤中细胞凋亡的影响

目的 观察中药灯盏细辛对大鼠肾脏冷缺血再灌注损伤(IRI)中肾脏细胞凋亡及相关基因表达的影响.方法 封闭群SD大鼠36只,随机分为3组,每组12只.假手术组(A组),对照组(B组),实验组(C组).药物应用:C组术前15 min,灯盏细辛注射液按1.2 ml/100 g通过尾静脉注射,A、B组按相应剂量注射生理盐水.动物手术:A组,切除右肾.B、C组采用的是冷IRI模型,3组大鼠均在术后24h再次手术切除左肾进行检测.透射电镜检查肾组织形态学,免疫组织化学检测凋亡相关的基因bcl-2与bax的表达,原位末端标记法(TUNEL)检测细胞凋亡.结果 (1)超微结构检查(透射电镜):A组结构正常;B组细胞呈损伤形态:线粒体肿胀,微绒毛减少,胞质内空泡形成,部分细胞核可见凋亡迹象.C组病变较B组显著减轻.(2)免疫组织化学蛋白阳性染色指数(PI):缺血再灌注后B、C组的bcl-2表达分别为(21.21±1.18)％和(35.52±1.94)％,较A组(4.95±0.77)％均增多(P＜0.05),B组低于C组(P＜0.05).B、C组的bax表达分别为(58.55±2.90)％和(45.90±3.14)％,较A组(4.67±0.67)％增多(P＜0.05),而且B组高于C组(P＜0.05).A组的蛋白阳性染色指数的比值bcl-2/bax为(1.06±0.07)高于B组(0.35±0.03)和C组(0.78±0.07,P＜0.05),而且C组高于B组(P＜0.05).(3)细胞凋亡检测(TUNEL):细胞凋亡指数B组(28.57±3.58)％和C组(19.99±3.37)％均显著大于A组(2.33±0.42)％(P＜0.01),C 组小于B组(P＜0.01).结论 灯盏细辛减少大鼠肾脏冷IRI诱导的肾脏细胞的凋亡,与调节凋亡相关基因bcl-2与bax表达有关.     

Effects of penehyclidine hydrochloride on apoptosis of lung tissues in rats with traumatic acute lung injury

Objective： To investigate the effects ofpenehyclidine hydrochloride on apoptosis of lung tissue cells and its mechanism in acute lung injury following blunt chest trauma in rats. Methods： Sprague Dawley （SD） rats （n=54） weighing （250-25） g were divided equally and randomly into three groups： normal control group （C group, n= 18）, trauma model group （T group, n= 18） and penehyclidine hydrochloride treatment group （P group, n=18）. Each group was further divided into three subgroups according to the time points of 3, 12 and 24 hours after experiment （at each time point, n=6 for each subgroup）. Rats of P group were intraperitoneally injected with penehyclidine hydrochloride for 2 mg/kg immediately after blunt chest trauma and rats in its 24 hours subgroup were once again injected with penehyclidine hy- drochloride in the same dose 12 hours after injury. Lung tissue samples were collected at every time point and cell apoptosis in lung tissues were measured by TUNEL. Apoptotic index （AI） was calculated, expressions of bax and bcl-2 were detected by immunohistochemical staining of SABC, and lung tissue sections were taken for light and electron microscopic observation. Results： As compared with C group, at every time point, AI and expressions ofbax and bcl-2 in T group were higher （P〈0.05）, and the ratio of bcl-2/bax markedly decreased （P〈0.05）, especially in the 24 hours subgroup. The ratio in T group （0.468±0.007） was lower than that in C group （1.382±0.058, t=12.5, P〈0.01）. Lung tissue injuries were significant under a light microscope, and the number of apoptotic cells increased obviously under a transmission electron microscope. As compared with T group at the same phase, AI and expression of bax decreased in P group （P〈0.05 and P〈0.01）, while the expression of bcl-2 increased significantly （P〈0.01）, and the ratio of bcl-2/bax markedly increased （P〈0.05）, especially in the 24 hours subgroup. The ratio in P group （1.012-0.070） was much higher than that in T group （0.468±0.007, t=-8.3, P〈0.01）. The injury of lung tissues was relieved, and apoptosis of cells decreased obviously under a transmission electron microscopic observation. Conclusions： Apoptosis and expressions ofbax and bcl-2 in lung tissues might be involved in the pathogenesis of lung injury induced by blunt chest trauma. Penehyclidine hydrochloride can alleviate lung injuries by inhibiting apoptosis of lung tissue cells, during which effects ofpenehyclidine hydrochloride on regulating expressions ofbax and bcl-2 may play an important role.     

缺氧诱导因子-1α对体外模拟CO2气腹下人胃癌细胞凋亡的影响

目的 通过体外模拟CO2气腹环境,构建沉默缺氧诱导因子-1α(HIF-1α)的RNAi表达载体,探讨HIF-1α对CO2气腹环境下人胃癌细胞MKN-45凋亡的影响及机制.方法 利用密闭培养箱模拟CO2气腹,气腹机维持培养箱内压力分别为0、5、10、15 mm Hg(1 mm Hg=0.133 kPa),采用RT-PCR方法和Western blot方法观察沉默HIF-1α前后MKN-45细胞HIF-1α mRNA和蛋白表达变化.免疫组化技术观察沉默HIF-1α前后细胞bcl-2/bax表达变化.Annexin V-FITC/PI舣标染色、流式细胞仪检测沉默HIF-1α前后细胞凋亡比例变化.结果 沉默HIF-1α前15 mm Hg组细胞HIF-1α mRNA和蛋白表达(1.48±0.22和1.34±0.09)以及10 nnn Hg组细胞蛋门表达(1.25±0.10)均显著高于对照组(0.55±0.17和0.83±0.04)(P＜0.05).0、5、10 mm Hg组细胞HIF-1α mRNA和0、5 mm Hg蛋白表达与对照组比较差异无统计学意义(P＞0.05).沉默HIF-1α前15 mm Hg组细胞bcl-2/bax比值(0.78±0.05)较对照组(1.43±0.15)明显降低(P＜0.05),细胞凋亡比例(11.70±0.12)较对照组(0.22±0.07)显著增加(P＜0.01).而在沉默HIF-1α后15 mm Hg组细胞HIF-1α mRNA表达(0.52±0.11)和蛋白表达(0.92±0.02)、bcl-2/bax比值(1.57±0.04)、细胞凋亡比例(0.45±0.11)与对照组比较均无显著差异(P＞0.05).结论 在CO2气腹环境压力为0、5、10 mmHg CO2时MKN-45细胞凋亡比例与对照组比较无显著差异,压力为15 mm Hg时CO2气腹可促进胃癌细胞凋亡,HIF-1α可能为促进细胞凋亡的重要因子.     

热休克蛋白70对大鼠离体心脏细胞凋亡的影响

目的 观察热休克蛋白70(HSP70)对离体大鼠供心心肌细胞凋亡相关蛋白bcl-2、bax表达的影响.方法 Wistar大鼠18只,分为2组:对照组(C,n=9),腹腔注射生理盐水0.5 ml,24 h后取离体心脏灌注HTK心脏保护液,4 ℃保存3 h后建立Langendorff离体心脏灌注模型,灌注KH液2 h;实验组(E,n=9)腹腔注射重酒石酸去甲肾上腺素(溶于生理盐水中)3.1 μmol/kg(0.53 mg/kg),腹腔注射24 h后取离体心脏,处理方法旧C组.运用免疫组织化学SP法测定心肌HSP70含量、bcl-2、bax蛋白的含量并做统计学处理比较.结果 HSPT0含量E组(17.78±1.82)较C组(5.22±1.05)明显增高(P＜0.01),bel-2的表达E组(41.88±5.09)较C组(31.36±3.27)明显增多(P＜0.01),bax的表达E组(22.61±3.49)较C组(40.52±4.17)明显减少(P＜0.01),bel-2/bax比值E组(1.86±0.11)较C组(0.77±0.01)明显增高(P＜0.05).结论 心肌HSP70高表达能促进心肌抗凋亡蛋白bcl-2的表达,减少促凋亡蛋白bax表达,增加bel-2/bax比率,抑制心肌细胞凋亡.     

低温保存不同时间大鼠带瓣管道活性与bax、bcl-2基因表达的关系

目的 观察低温保存不同时间大鼠带瓣血管活性及bax和bcl-2基因的表达,探讨基因检测是否能成为带瓣血管活性指标.方法 Wistar大鼠80只,体质量250～350 g,分为新鲜组A组,-196 ℃液氮冻存3、6、9个月为B、C、D 3组.检测细胞结构、糖代谢及bax、bcl-2基因的变化.结果 大鼠带瓣血管的各组葡萄糖代谢率测定,A组(4.365±0.784)与B(4.383±0.548)、C组(4.446±0.608)、D组(4.090±0.657)差异无统计学意义(P＞0.05);bax基因的表达分别为20%、45%、60%和85%,差异有统计学意义(P＜0.05);bcl-2基因表达分别25%、30%、20%和35%,差异无统计学意义(P＞0.05).结论 经冻存后的大鼠带瓣血管活性良好,提示bax基因可作为检测带瓣血管活性的指标,bcl-2的表达或高表达可能是细胞能耐受冻存打击的原因之一.

Abstract：

Objective To study the expression of bax and bcl-2 genes and activity of valved conduit in rats by cryopreservation for different lengths, and to probe whether genetic detection will become one of the indexes of valved conduit activity. Methods Eighty Wistar rats were divided into four groups: 20cases of fresh blood vessels ( group A ), 20 cases of frozen vessels for 3 months ( group B ), 20 for 6months ( group C), and 20 for 9 months ( group D). The changes in cellular structure, gluoce metabolism and the expression of bax and bcl-2 proteins were observed. Results The glucose metabolism rate of the rate valved conduit in groups A, B, C and D was 4. 365 ± 0. 784, 4. 383 ± 0. 548, 4. 446 ± 0. 608, and 4. 090 ± 0. 657 respectively, with the difference being not significant ( P ＞ 0. 05 ). The positive expression rate of bax protein in groups A, B, C and D was 20%, 45%, 60% and 85% respectively (P＜0. 05).The positive expression rate of bcl-2 in groups A, B, C and D was 25%, 30%, 20% and 35% respectively ( P ＞ 0. 05 ). Conclusion The frozen rat valved vascular showed good activity. bax gene can be regarded as one of the indicators for detecting valved vessel activity. The expression or over-expression of bcl-2gene may be one of the reasons why the cells can tolerate the frozen preservation.     

前列地尔对兔肾缺血再灌注时细胞凋亡的保护作用

目的 观察前列地尔对兔肾缺血再灌注损伤时肾小管上皮细胞凋亡的保护作用.方法 建立兔肾缺血再灌注损伤动物模型,将实验兔随机分为3组:即对照组、缺血再灌注组和前列地尔组,每组10只.检测兔血清肌苷(Cr)、尿素氮(BUN)浓度及肾组织中丙二醛(MDA)、超氧化物歧化酶(SOD)和髓过氧化物酶(MPO)含量及肾组织中凋亡细胞.结果 与对照组比较,缺血再灌注组和前列地尔组在再灌注后Cr、BUN水平均大幅度上升(P＜0.05);但前列地尔组动物在再灌注60min后Cr水平(231.32±17.57)μmol/L明显低于缺血再灌注组(390.61±20.42)μmol/L(P＜0.05);肾小管上皮细胞bcl-2、bax、Caspase-3表达与对照组比较,缺血再灌注组明显增强(P＜0.05);前列地尔组与缺血再灌注组比较表达减弱,但仍强于对照组(P＜0.05).前列地尔组、缺血再灌注组与对照组比较凋亡细胞数增多,前列地尔组与缺血再灌注组比较凋亡细胞数减少.MDA、SOD与MPO的活性与对照组比较,缺血再灌注组与前列地尔组明显增强(P＜0.05);前列地尔组与缺血再灌注组比较,该两者活性明显减弱(P＜0.05).结论 前列地尔在肾脏缺血再灌注损伤时能有效的保护肾功能其作用机制可能是通过减少细胞脂质过氧化,从而降低bcl-2、bax、Caspase-3等凋亡基因的表达.

Abstract：

Objective To study the alprostadil effects of alprostadil on apoptosis by renal ischemia-reperfusion injury (IR[) in rabbits. Methods The rabbit IRI models were made, and randourly divided into three groups: control group, IR[group and prostavasin intervention group. The creatinine (Ct) and blood urea nitrogen (BUN) were determined. Malondialdehyde ( MDA), superoxide dismutase (SOD),myeloperoxidase ( MPO), bcl-2, bax, Caspase-3 and apoptosis were assayed at 60 min after reperfusion.Results The Cr and BUN levels in plasma in IRI group and Prostavasin intervention group were increased obviously after reperfusion. The Cr levels at 60 min after repeffusion in alprostadil intervention group (231.32 + 17. 57 ) μmol/L were significantly lower than in IRI group ( 390. 61 ± 20. 42 ) μ mol/L, ( P ＜0. 05 ). The levels of bcl-2, bax, Caspase-3 in the renal tissue in IRI group were significantly higher than in control group ( P ＜ 0. 05 ), and those in alprostadil intervention group were lower than in IRI group, but markedly higher than in control group (P ＜ 0. 05 ). The number of apoptotic cells in alprostadil intervention group and IRI group was increased as compared with control group, and that in alprostadil intervention group was reduced as compared with IRI group. The contents of MDA, SOD and MPO in renal tissue of IRI group and Prostavasin intervention group were significantly higher than in control group ( P ＜ 0. 05 ), and those in IRI group were significantly lower than in alprostadil intervention group (P ＜0. 05 ). Conclusion Alprostadil could be used to protect renal ischemia-reperfusion injury probably by decreasing oxygen free radicals generation, inhibiting neutrophils aggregating and activating in the renal tissues, thereby inhibiting the expression of bcl-2, bax, Caspase-3.