Apoptosis of human trabecular meshwork cells induced by transforming growth factor-beta2 in vitro.

Whether transforming growth factor-beta2 (TGF-beta2) induces apoptosis of human trabecular meshwork cells was investigated in vitro. Cultured 3-5 passage human trabecular meshwork cells were treated with 0 (control), 0.32, 1, 3.2 ng/ml TGF-beta2 for 48 h and divided into control group and experimental group. The apoptosis of human trabecular meshwork cells was examined by transmission electron microscopy, TUNEL technique and flow cytometry. The results showed characteristic morphologic changes of apoptotic cells were observed under transmission electron microscopy. DNA fragmentation of human trabecular meshwork cells was found by TUNEL technique. Quantitative analysis of flow cytometry showed that percentages of apoptotic human trabecular meshwork cells were (2.79 +/- 0.44)%, (4.43 +/- 1.17)% and (9.60 +/- 2.05)% respectively with different concentrations [1 ng/ml (P<0.05), 3.2 ng/ml (P<0.01)] of TGF-beta2 with the difference being significant between experimental group and control group [(1.41 +/- 0.34)%]. It was concluded that TGF-beta2 can induce apoptosis of human trabecular meshwork cells in vitro and may be involved in the decrease of trabecular meshwork cells in the patients with primary open angle glaucoma and aging of normal people.     

Antagonistic Effects of Tranilast on Proliferation and Collagen Synthesis Induced by TGF-β2 in Cultured Human Trabecular Meshwork Cells

Whether tranilast had antagonistic effect on proliferation inhibition and collagen synthesis promotion induced by TGF-β2 in cultured human trabecular meshwork cells was investigated. Suspension of 1 × 104 cultured human trabecular meshwork cells of 3-5 passage was distributed in each well of a 96-well disk and divided into control group and experimental group. After 24 h, 0 μg/ml (control), 12.5 μg/ml, 25 μg/ml, 50 μg/ml tranilast with 3.2 ng/ml TGF-β2 were added into the incubation medium. Another 24 h later, proliferation and collagen synthesis in cultured human trabecular meshwork cells were examined respectively by using tetrazolium-based semiautomated colormetric (MTT) assay and 3 H-proline incorporation with liquid scintillation technique. The results showed absorbance (A) values of the experimental groups were 0. 9036 ± 0. 3017, 1.1361 ±0.1352, 1.2457 ±0.1524 according to the different concentrations of tranilast, and 0. 8956 ±0. 1903 of the control group. In comparison with the control group, 25 μg/ml (q′= 3. 23, P＜0.05), 50 μg/ml (q=4.70, P＜0.01) tranilast significantly antagonized the decrease of the A values induced by TGF-β2 in the cultured human trabecular meshwork cells. In comparison with the control group [817.37±124.21 cpm/104 cells], 12.5 μg/ml (620.33±80.46 cpm/104 cells, q′=4.26, P＜0.05),25 μg/ml (594. 58±88.13 cpm/104 cells, q′=4. 81, P＜0.01), 50 μg/ml (418. 64±67.90 cpm/104 cells, q′=8.62, P＜0.01) tranilast significantly inhibited the incorporation of 3 H-proline into the cultured human trabecular meshwork cells promoted by TGF-β2 in a dose-dependent manner. It was concluded that tranilast had the antagonistic effect on the proliferation inhibition and collagen synthesis promotion induced by TGF-β2 in the cultured human trabecular meshwork cells.     

Apoptosis of human trabecular meshwork cells induced by transforming growth factor-β<Subscript>2</Subscript><Emphasis Type="Italic">in vitro</Emphasis><Emphasis Type="Italic">in vitro</Emphasis>

Summary Whether transforming growth factor-β₂ (TGF-β₂) induces apoptosis of human trabecular meshwork cells was investigatedin vitro. Cultured 3–5 passage human trabecular meshwork cells were treated with 0 (control). 0. 32. 1, 3. 2 ng/ml TGF-β₂ for 48 h and divided into control group and experimental group. The apoptosis of human trabecular meshwork cells was examined by transmisson electron microscopy. TUNEL technique and flow cytometry. The results showed character istic morphologic changes of apoptotic cells were observed under transmission electron microscopy. DNA fragmentation of human trabecular meshowork cells was found by TUNEL technique. Quantitative analysis of flow cytometry showed that percentages of apoptotic human trabecular meshwork cells were (2.79±0.44)%. (4.43±1.17)% and (9.60±2.05)% respectively with different concentrations [1 ng/ml (P<0.05), 3.2 ng/ml (P<0.01)] of TGF-β₂ with the difference being significant between experimental group and control group [(1.41±0.34)%]. It was concluded that TGF-β₂ can induce apoptosis of human trabecular meshwork, cellsin vitro and may be involved in the decrease of trabecular meshwork cells in the patients with primary open angle glaucoma and aging of normal people. CAO Yang, male, born in 1972, M. D., Ph. D., Associate Professor This project was supported by a grant from the National Natural Sciences Foundation of China (No. 38970758).     

Transforming Growth Factor-β_2 Gene Cloning and Protein Expression in Human Trabecular Meshwork Cells

Primary open- angle glaucoma (POAG) is aleading cause of blindness,which involves optic neu-ropathy accompanied by characteristic visual field de-fects and is often associated with elevated intraocularpressure due to disturbance ofaqueoushumor outflowthrough the trabecularmeshwork (TM) .The patho-physiology of the TM in POAG has been character-ized by an increasein extracellularmatrix componentsand a decrease in the number of TM cells[1,2 ] .It hasbeen found that,compared with the non- P…     

Antagonistic effects of trasilast on proliferation and collagen synthesis induced by TGF-\sB<Subscript>2</Subscript> in cultured human trabecular meshwork cellsin cultured human trabecular meshwork cells

Summary Whether tranilast had antagonistic effect on proliferation inhibition and collagen synthesis promotion induced by TGF-\sB₂ in cultured human trabecular meshwork cells was investigated. Suspension of 1×10⁴ cultured human trabecular meshwork cells of 3–5 passage was distributed in each well of a 96-well disk and divided into control group and experimental group. After 24 h, 0 μg/ml (control), 12.5 μg/ml, 25 μg/ml, 50μg/ml tranilast with 3.2 ng/ml TGF-\sB₂ were added into the incubation medium. Another 24 h later, proliferation and collagen synthesis in cultured human trabecular meshwork cells were examined respectively by using tetrazolium-based semiautomated colormetric (MTT) assay and³H-proline incorporation with liquid scintillation technique. The results showed absorbance (A) values of the experimental groups were 0.9036±0.3017, 1.1361±0.1352, 1.2457±0.1524 according to the different concentrations of tranilast, and 0.8956±0.1903 of the control group. In comparison with the control group, 25 μg/ml (q=3.23,P<0.05), 50 μg/ml (q′=4.70,P<0.01) tranilast significantly antagonized the decrease of theA values induced by TGF-\sB₂ in the cultured human trabecular meshowrk cells. In comparison with the control group [817.37±124.21 cpm/10⁴ cells], 12.5 μg/ml (620.33±80.46 cpm/10⁴ cells,q′=4.26,P<0.05), 25 μg/ml (59.4.58±88.13 cpm/10⁴ cells,q′=4.81,P<0.01), 50 μg/ml (418.64±67.90 cpm/10⁴ cells,q′=8.62,P<0.01) tranilast significantly inhibited the incorporation of³H-proline into the cultured human trabecular meshwork cells promoted by TGF-\sB₂ in a dose-dependent manner. It was concluded that tranilast had the antagonistic effect on the proliferation inhibition and collagen synthesis promotion induced by TGF-\sB₂ in the cultured human trabecular meshwork cells. Da Banghong, female, born in 1973, Resident. This project was supported by a grant from the National Natural Sciences Foundation of China (No. 38970758).     

神经生长因子在肝纤维化大鼠肝星状细胞凋亡中的作用

目的探讨神经生长因子(NGF)在肝纤维化大鼠肝星状细胞(HSC)增殖、凋亡中的作用。方法HSC株分别在实验组(分别以NGF 50、100和150ng／ml干预HSC)和对照组(单纯HSC培养)中体外培养24、48和72 h。应用四甲基偶氮唑盐(MTT)法检测细胞增殖率;原位杂交凋亡检测(TUNEL)法观察HSC凋亡状况;流式细胞术检测细胞凋亡率;显微镜观察细胞形态学变化。结果①MTT法显示,不同浓度的NGF作用HSC 24 h,实验组HSC增殖率均低于对照组,差异有统计学意义(均P<0．05)。NGF浓度为100 ng／ml时,HSC增殖率低于对照组最显著(0．63±0．02 vs 0．77±0．03,P<0．05);②最适浓度的NGF(100 ng／ml)作用HSC 24、48和72 h,第72小时的HSC增殖率低于对照组最显著(0．48±0．03 vs 0．89±0．01,P<0．05),增殖率的降低呈时间依赖性;③最适浓度的NGF(100 ng／ml)作用HSC 24 h,TUNEL法显示HSC凋亡率显著高于对照组(10．2％±1．2％vs 1．6％±0．1％,P<0．05);同时,流式细胞术显示HSC凋亡率为6．2％±0．2％,而对照组无凋亡;④NGF对HSC形态没有明显影响。结论NGF可诱导体外活化的HSC凋亡。     

重组人骨形态发生蛋白7对原发性开角型青光眼小梁网细胞增殖的影响

目的 建立原发性开角型青光眼(POAG)小梁网细胞体外原代培养体系; 分析不同终浓度重组人骨形态发生蛋白7(rhBMP7)对POAG小梁网细胞增殖的影响; 探讨rhBMP7与POAG发生、进展的相关性。 方法 取术中切除的带小梁网组织块(未使用丝裂霉素C),进行体外原代及传代培养,取3代小梁网细胞,在CFDA SE标记后,分别加入终浓度为0(对照组),20,50,80,100,200 ng/mL的rhBMP7无血清培养基,采用CCK8、荧光显微镜、流式细胞仪等方法检测POAG小梁网细胞增殖情况。 结果 细胞经传代培养,经鉴定为POAG小梁网细胞; 采用CCK8法检测发现:经终浓度为0(对照组),20,50,80,100,200 ng/mL的rhBMP7处理后,POAG小梁网细胞吸光度(OD值)分别为:(0.561 2±0.026 9),(0.724 2±0.039 3),(1.416 0±0.016 2),(1.740 4±0.039 2),(1.853 8±0.014 5),(1.936 4±0.054 6); 实验组细胞增殖率分别为1.37%,2.96%,3.70%,3.96%,4.15%; 实验组与对照组及各实验组间增殖率比较,差别具有统计学意义(P<0.05); 荧光显微镜示:随着rhBMP7终浓度的增加,经CFDA SE标记的POAG小梁网细胞荧光染色变浅、细胞量及密度增加; 采用流式细胞仪检测经20,50,80,100,200 ng/mL终浓度rhBMP7干预的POAG患者小梁网细胞,分裂、增殖细胞所占的比例分别为17.85%,18.63%,20.10%,27.45%,72.41%。 结论 运用组织块培养法,可体外原代培养出POAG患者的小梁网细胞; rhBMP7在一定程度上可促进POAG小梁网细胞的增殖,且在一定范围内呈剂量依赖性。     

Studies on arsenic trioxide induced mice melanoma Cloundman S91 cell apoptosis

INTRODUCTION ArsenichasalonghistoryofuseinChineseandwesternmedicine,buthasbeenoutofuseinthe mid20thcenturybecauseoftheunacceptablesideef fects.There emergenceofarsenictrioxideinclinicaluse isduelargelytopurificationofthiscompoundfromtra ditionalmixturesandtheAs2O3definitionofeffective,low doseregimensforthetreatmentofacutepromyelo cyticleukemia(APL)[1].Recently,theapoptosis As2O3inducedhasbeenobservedinmanycancercell lines,includingesophagedcarcinoma,gastriccancer,neuroblastomalymphoid…     

Antagonistic effects of tranilast on proliferation and collagen synthesis induced by TGF-beta2 in cultured human trabecular meshwork cells.

Whether tranilast had antagonistic effect on proliferation inhibition and collagen synthesis promotion induced by TGF-beta2 in cultured human trabecular meshwork cells was investigated. Suspension of 1 x 10(4) cultured human trabecular meshwork cells of 3-5 passage was distributed in each well of a 96-well disk and divided into control group and experimental group. After 24 h, 0 microg/ml (control), 12.5 microg/ml, 25 microg/ml, 50 microg/ml tranilast with 3.2 ng/ml TGF-beta2 were added into the incubation medium. Another 24 h later, proliferation and collagen synthesis in cultured human trabecular meshwork cells were examined respectively by using tetrazolium-based semiautomated colormetric (MTT) assay and 3H-proline incorporation with liquid scintillation technique. The results showed absorbance (A) values of the experimental groups were 0.9036 +/- 0.3017, 1.1361 +/-0.1352, 1.2457 +/- 0.1524 according to the different concentrations of tranilast, and 0.8956 +/-0.1903 of the control group. In comparison with the control group, 25 microg/ml (q'= 3.23, P< 0.05), 50 microg/ml (q'=4.70, P<0.01) tranilast significantly antagonized the decrease of the A values induced by TGF-beta2 in the cultured human trabecular meshwork cells. In comparison with the control group [817.37+/-124.21 cpm/10(4) cells], 12.5 microg/ml (620.33+/-80.46 cpm/10(4) cells, q'= 4.26, P<0.05), 25 microg/ml (594.58+/-88.13 cpm/10(4) cells, q'=4.81, P<0.01), 50 microg/ml (418.64+/-67.90 cpm/10(4) cells, q'=8.62, P<0.01) tranilast significantly inhibited the incorporation of 3H-proline into the cultured human trabecular meshwork cells promoted by TGF-beta2 in a dose-dependent manner. It was concluded that tranilast had the antagonistic effect on the proliferation inhibition and collagen synthesis promotion induced by TGF-alpha2 in the cultured human trabecular meshwork cells.     

AM12质粒对体外肾小管上皮细胞凋亡和分泌转化生长因子-β_1的影响

目的观察AM12质粒(含乙型肝炎病毒3.2 kb全基因组)对体外培养的人近端肾小管上皮细胞HK-2凋亡和分泌转化生长因子-β1(TGF-β1)的影响。方法以体外培养的HK-2细胞为对象,以AM12质粒转染HK-2细胞为转染组,以正常HK-2细胞作为对照组,用流式细胞仪检测细胞的凋亡及Fas表达率;用酶联免疫吸附法(ELISA)检测上清液中TGF-β1的浓度。结果转染组HK-2凋亡率为(1.49±0.02)%,高于对照组的(1.03±0.09)%(P<0.05);Fas表达率为(10.09±2.34)%,高于对照组的(6.58±0.65)%(P<0.05);上清液TGF-β1水平为(283.85±61.12)ng.L-1,高于对照组的(210.28±47.21)ng.L-1(P<0.05)。结论 HBV-DNA质粒转染体外培养的人肾小管上皮细胞可诱导其凋亡并上调其对TGF-β1的分泌。     

Modulation of Matrix Metalloproteinase and TIMP-1 Expression by TGF-β1 in Cultured Human RPE Cells

In order to investigate the effects of TGF-β1 on the expression of MMP-2, -9 and TIMP1 in human retinal pigment epithelial (RPE) cells, the third-sixth passage cultured RPE cells were treated with TGF-β~ at different concentrations (0.01, 0. 1, 1.0, 10 ng/mL), the expression of MMP-2, -9 and TIMP-1 mRNA was detected by semi-quantitative RT-PCR assays. MMP-2, -9 and TIMP-1 mRNA were expressed in the cultured RPE cells. The values of MMP-2/β-actin in the cells treated with 0.1, 1.0, 10 ng/mL TGF-β1 were 1.04±0.04, 1.07±0.02 and 1.11±0.03, respectively, significantly higher than in the control group (0. 96±0.03, P＜0. 05-0. 01). The expression of MMP-2 mRNA could be up-regulated by TGF-β1, in a dose-dependent manner. The expression of MMP-9 mRNA in the cultured RPE cells was slightly up-regulated by various TGF-β1 concentrations treatment. The values of TIMP-1/β-actin in the cells treated with 0.01 and 0. 1 ng/mL TGF-β1 were 0. 85±0.01 and 0.97 ± 0.02 respectively, significantly lower than in the control group (1.07±0.04, P＜0.01), indicating that the expression of TIMP-1 mRNA was down-regulated by TGF-β1 at low concentrations. But along with the increase of TGF-β1 concentrations (1.0 and 10 ng/mL), the expression of TIMP-1 mRNA was slightly up-regulated, not significantly different from that in the control group (P＞0.05). It was concluded that TGF-β1 might play an important role in the up-regulation of the expression of MMP-2 in RPE cells and result in a directional shift in the balance between MMP and TIMP. This may be facilitated for RPE cells to migrate in the pathogenesis of vitreoretinopathy.     

复方苦参注射液对人食管鳞癌EC9706细胞凋亡及生长抑制的影响

目的 探讨复方苦参对人食管癌细胞株EC9706的生长抑制和诱导凋亡作用.方法 体外实验分为复方苦参25.00 μl/ml组、6.25 μl/ml组及对照组.采用四甲基偶氮唑蓝(MTT)法检测细胞增殖活性,SP法检测增殖细胞核抗原(PCNA)表达.流式细胞仪测定细胞周期及细胞凋亡,Western印迹检测细胞半胱氨酸蛋白酶(caspase)-3、Bc1-2及Fas蛋白的表达.平板克隆形成实验测定细胞克隆形成率.裸鼠移植瘤实验检测复方苦参的体内抑瘤作用,分为200μl／d治疗组、25μl／d治疗组及生理盐水对照组.SP法检测移植瘤PCNA及Bc1-2的表达,原位末端标记(TUNEL)法检测细胞凋亡.结果 体外实验中25.00 μl/ml组细胞48、72、96h增殖活性均低于对照组(均P＜0.01);PCNA表达水平及体外克隆形成率均低于对照组(均P＜0.05);细胞凋亡率、激活型caspase—3表达及Fas表达均高于对照组[(25.2±7.3)％比(3.4±1.5)％、(21.3±4.4)％比(1.8±0.6)％、(30.2±8.3)％比(5.4±1.6)％,均P＜0.01],Bc1-2表达低于对照组(P＜0.01).动物实验200μL／d治疗组瘤体质量低于生理盐水对照组[ (987±386) nmg比(1935±838) mg,P＜0.01],凋亡指数高于生理盐水对照组[(33.8±8.7)％比(5.3±1.4)％,P＜0.01].结论 复方苦参能够抑制EC9706细胞增殖,诱导细胞凋亡,阻止移植瘤生长.诱导凋亡机制可能与EC9706细胞周期阻滞、Bc1-2表达下调、Fas表达上调及caspase-3激活有关.     

没食子儿茶素没食子酸酯诱导人肝癌细胞凋亡

目的 探讨没食子儿茶素没食子酸酯(EGCG)诱导人肝癌细胞株凋亡的作用和机制.方法 以不同浓度EGCG处理人肝癌细胞株HepG2和SMMC-7721细胞24 h和48 h.四甲基偶氮唑蓝比色法和锥虫蓝染色细胞计数评价细胞生长情况;流式细胞术检测细胞凋亡和环氧合酶-2(COX-2)、Bcl-2蛋白;比色法测定天冬氨酸蛋白酶-9和caspase-3活性;RT-PCR检测COX-2和Bcl-2家族mRNA的表达.结果 EGCG(50、100、200、400μg/ml)处理48 h后,HepG2细胞活性下降至93.8%±2.8%,62.3%±5.4%,33.9%±2.5%和17.6%±3.2%,与对照组(100.0%±2.8%)比较差异均有统计学意义(均P＜0.05);SMMC-7721细胞活性下降至49.6%±3.5%,30.3%±3.8%,17.7%±2.2%和13.0%±2.5%,与对照组(100.0%±0.8%)比较差异均有统计学意义(均P＜0.05);100 μg/ml EGCG处理细胞24、48、72和96 h后,HepG2活细胞计数(×104)分别是8.0±1.5,22.0±3.1,37.0±5.4和61.0±8.7,与对照组(15.0±2.5,45.0±5.3,86.0±11.0和210.0±23.0)相比明显减少,差异均有统计学意义(均P＜0.05);SMMC-7721活细胞计数(×104)分别是7.0±2.2,13.0±2.5,20.0±3.7和31.0±4.0,与对照组(14.0±2.2,40.0±4.3,75.0±8.8和182.0±28.0)相比明显减少,差异均有统计学意义(均P＜0.05).EGGG(50、100、200μg/ml)处理细胞12 h后,HepG2细胞凋亡率分别是8.7%±0.4%,18.1%±1.1%和22.1%±1.8%;SMMC-7721细胞凋亡率分别是5.9%±0.3%,7.8%±0.6%和12.2%±0.8%,与对照组(3.3%±0.3%)和(3.7%±0.4%)比较,差异均有统计学意义(P＜0.05);EGCG(100、200μg/ml)处理细胞12 h后,HepG2细胞caspase-9活性为1.8±0.4和2.5±0.4;caspase-3活性为2.0±0.4和2.8±0.5,两者与对照组(1.0±0.1和1.0±0.2)比较差异均有统计学意义(均P＜0.05);SMMC-7721细胞caspase-9活性为1.7±0.4和2.5±0.4,caspase-3活性为1.9±0.4和2.6±0.3,均显著高于对照组(1.0±0.1和1.0±0.2,P＜0.05).EGCG(200μg/ml)下调COX-2和Bcl-2的表达,而对Bcl-2家族其他成员表达无明显影响.结论 EGCG可能通过下调COX-2和Bcl-2的表达,激活caspase-9和caspase-3诱导肝癌细胞凋亡.     

TGF-β_1和TL1A在高糖所致血管内皮细胞凋亡中的作用

目的:观察高糖条件下,内皮细胞分泌的TGF-β1和TL1A对细胞凋亡的影响。方法:以22.4mmol/L葡萄糖培养细胞不同时间(0h,6h,12h,24h,48h),RT-PCR和Westernblot检测内皮细胞TGF-β1和TL1A表达,Annexin V-FITC/PI双染色、流式细胞仪测定细胞凋亡率。结果:高糖条件下HUVECTGF-β1和TL1A表达增加(均P<0.01),22.4mmol/L葡萄糖培养条件下,TGF-β1的表达高峰在12h,TL1A高表达峰值在48h。高糖条件下细胞凋亡率明显增加(21.06%±3.05%vs3.09%±0.32%,P<0.01)。在正常糖培养的HUVEC中加入外源性的TGF-β1和TL1A,均导致细胞凋亡率显著增高(15.26%±2.93%,55.70%±8.91%vs3.09%±0.32%,均P<0.01),在高糖培养液中加入抗TL1A抗体能明显抑制细胞凋亡发生(4.28%±0.48%vs21.06%±3.05,P<0.01),但加入抗TGF-β1抗体却不能逆转高糖诱导的细胞凋亡(20.93%±3.21vs21.06%±3.05%,P>0.05)。结论:高糖上调内皮细胞TGF-β1和TL1A的表达,TL1A介导高糖引起内皮细胞凋亡的作用,高糖引起内皮细胞凋亡与TGF-β1无关。     

TGF-β1介导新生大鼠心肌成纤维细胞Ⅰ型和Ⅳ型胶原合成的研究

目的:观察TGF-β1对原代培养的新生大鼠心肌成型与Ⅳ胶原表达的影响。方法:取出生3~7d的SD大鼠心脏,利用酶消化法结合差速贴壁体外培养心肌成纤维细胞;分别用不同浓度的TGF-β1(TGF-β1=10 ng/mL、1ng/mL、0 ng/mL)干预心肌成纤维细胞,分别于干预后5h、24h,采用RT-PCR检测I型胶原和Ⅳ型胶原的表达。结果:1.用0ng/mL(对照组),1ng/mL和10ng/mL的TGF-β1干预心肌成纤维细胞5h,RT-PCR检测I型胶原/β-actin光密度值分别为0.61±0.02,0.73±0.03和0.86±0.04,光密度值随着TGF-β1浓度的增加而增加,各组比较,差异有显著性(P<0.01);干预心肌成纤维细胞24h后,RT-PCR检测I型胶原/β-actin光密度值分别为0.65±.03,0.91±0.02和0.98±0.02,光密度值随着TGF-β1浓度的增加而增加,各组比较,差异有显著性(P<0.01)。2.用0 ng/mL(对照组),1ng/mL and 10ng/mL的TGF-β1干预心肌成纤维细胞5h,RT-PCR检测Ⅳ型胶原/β-actin光密度值分别为0.58±0.06,0.71±0.02,0.87±0.02,光密度值随着TGF-β1浓度的增加而增加,各组比较,差异有显著性(P<0.01);干预心肌成纤维细胞24h后,RT-PCR检测Ⅳ型胶原/β-actin光密度值分别为0.62±0.01,0.83±0.05,0.96±0.02,光密度值随着TGFβ1浓度的增加而增加,各组比较,差异有显著性(P<0.01)。结论:TGFβ1能加强I型和Ⅳ型胶原的表达,在24小时内呈时间和剂量依赖性。     

腺病毒载体介导的人14-3-3γ基因转移对鱼藤酮诱导的多巴胺能细胞损伤的保护作用

目的 探讨人14-3-3 γ基因转移对鱼藤酮诱导的多巴胺能细胞损伤的保护作用.方法用腺病毒载体携带人14-3-3 γ基因(Ad/14-3-3 γ)感染PC12细胞,基因转移成功后,用鱼藤酮处理细胞.四甲基偶氮唑盐法(MTT)测定细胞活性,DAP1染色法检测细胞凋亡,高效液相色谱检测细胞的分泌功能,激光共聚焦显微镜观察α-突触核蛋白(α-synuclein)的聚集.结果 Ad/14-3-3 γ组细胞吸光度A570 (0.46 ±0.09),高于Ad-null组(0.19 ±0.08)和鱼藤酮组(0.16±0.07),但低于正常对照组(0.63±0.11),分别与各组比较,差异均有统计学意义(均P＜ 0.01);Ad/14-3-3 γ感染组细胞培养液中多巴胺( 189±11) ng/ml和去甲肾上腺素(55±8)ng/ml,含量高于Ad-null感染组(79±12,38±7)ng/ml和鱼藤酮组(81 ±13,39±7)ng/ml(均P＜ 0.01);DAPI染色法显示Ad/14-3-3 γ组凋亡率(27％±6％),高于正常对照组(10％±5％),但明显低于Ad-null组(53％±10％)和鱼藤酮组(56％±12％),分别与各组比较,差异均有统计学意义(均P＜ 0.01);激光共聚焦显微镜下观察Ad/14-3-3 γ组细胞胞质内颗粒状α-synuclein聚集体较Ad-null组和鱼藤酮组显著减少.结论 腺病毒介导的14-3-3 γ基因转移对鱼藤酮诱导的多巴胺能细胞损伤具有保护作用.     

促肝细胞生长素部分逆转巨噬细胞趋化因子和马兜铃酸Ⅰ诱导的人肾小管上皮细胞转分化

目的观察促肝细胞生长素(hepatocyte growth-promoting factor,pHGF)对巨噬细胞趋化因子(monocyte chemo-tatic protein-1,MCP-1)协同马兜铃酸Ⅰ(aristolochic acidⅠ,AAⅠ)诱导的人肾小管上皮细胞(HKC)凋亡及上皮细胞-间质细胞转分化(epithelial-mesenchymal transition,EMT)的影响。方法体外培养的HKC随机分为:空白对照组、转分化模型组及不同浓度pHGF(0.15、1.5、15、150、1500ng/ml)处理组。转分化模型组采用MCP-1(0.1μg/ml)协同AAⅠ(10μg/ml)诱导HKC转分化模型;pHGF处理组采用不同浓度pHGF对转分化模型HKC进行处理;空白对照组常规培养。采用WST-8法和流式细胞术观察各组细胞增殖和凋亡情况;RT-PCR检测各组细胞α-SMA mRNA表达;免疫组化检测各组细胞α-SMA、TGF-β1、FN蛋白的表达。结果与空白对照组相比,转分化模型组、不同浓度pHGF处理组HKC细胞增殖抑制率,凋亡细胞所占比例,α-SMA mRNA表达均明显升高(P...     

血清转化生长因子β1与早期鼻咽癌患者急性放射性损伤程度和生存率的关系

目的观察早期鼻咽癌(T1-2N0-1M0)患者放疗前、后血清转化生长因子β1(TGF-β1)水平的变化,并分析其与急性放射性损伤、无疾病进展生存的关系。方法以32例健康志愿者的平均血清TGF-β1水平(50.2±3.2)ng/ml作为本试验患者的标准值。57例早期鼻咽癌初治患者按照放疗前血清TGF-β1含量分为两组:A组29例:血清TGF-β1值低于或等于标准值的患者;B组28例:血清TGF-β1值高于标准值的患者。检测患者放疗前、中、后的血清TGF-β1含量,评估患者急性放射性损伤程度及疗效。结果 A、B两组患者放疗前血清TGF-β1水平分别为(35.4±1.4)、(58.8±1.0)ng/ml,两组比较有统计学意义(P<0.05)。B组患者急性放射性粘膜、皮肤损伤程度明显高A组(P<0.05)。急性放射性粘膜、皮肤损伤3级的患者放疗前血清TGF-β1水平明显高于3级以下的患者[(54.0±2.2)ng/ml vs(42.0±2.3)ng/ml,(54.3±2.4)ng/ml vs(43.4±2.2)ng/ml,P<0.05]。A、B两组患者的局部复发及远处转移率(3.4%vs 7.1%,3.4%vs 10.8%)、无疾病进展生存率(DFS)比较无统计学意义(P>0.05)。结论放疗能降低早期鼻咽癌患者的血清TGF-β1水平,早期鼻咽癌患者放疗前的血清TGF-β1水平能预测患者急性放射性粘膜及皮肤损伤的程度,但与DFS无关。     

雌激素缺失及17β-estradiol替代治疗对大鼠海马β淀粉样蛋白含量的影响

目的 观察雌激素缺失及雌二醇(17β-estradiol)替代治疗对大鼠海马β淀粉样蛋白(Aβ)含量的影响及其可能机制.方法 切除大鼠双侧卵巢制作雌激素缺失模型(Ovx),然后给予17β-estradiol补充治疗.ELISA检测海马AB含量,荧光法测定α和β分泌酶活性,Western印迹检测β分泌酶(BACEl)和中性内肽酶(NEP)的表达.结果 Ovx大鼠雌激素水平[(11±4)pg/ml,P＜0.01]明显低于对照组[(21±8)pg/ml],而给予17β-estradiol替代治疗后雌激素水平上升[(63±13)pg/ml,P＜0.01];Ovx大鼠海马组织Aβ40[(28.5±4.5)ng/ml,P＜0.01]和Aβ42含量[(4.6±1.2)ng/ml,P＜0.01]均显著高于对照组的Aβ40[(14.4±2.4)ng/ml]和Aβ42[(2.8±0.4)ng/ml];而17β-estradiol替代治疗可以使Aβ40[(20.3±3.2)ng/ml,P＜0.01]和Aβ42[(3.8±0.5)ng/ml,P＜0.01]降低;Ovx大鼠α仅分泌酶活性降低(67.5%,P＜0.01)而β分泌酶活性增加(145.8%,P＜0.01),17β-estradiol替代治疗后部分逆转了上述现象;Ovx大鼠BACE1的表达增加(135.4%,P＜0.01)而NEP表达降低(40.8%,P＜0.01),而补充17β-estradiol后可以部分拮抗上述作用.结论 雌激素缺失可以增加去势大鼠海马AB含量,这可能与α分泌酶活性下降、BACE1活性增加和(或)NEP活性下降有关,而补充17β-estradiol可以降低Aβ含量;这可能是绝经后妇女雌激素替代治疗降低阿尔茨海默病发病危险性的原因之一.     

噻唑烷二酮类药物抑制白介素1 β和干扰素γ诱导的胰岛β细胞凋亡

目的 观察噻唑烷二酮类药物(TZD)抑制白介素1β(IL-1β)和干扰素γ(IFN-γ)诱导胰岛β细胞凋亡的作用及对胰岛素分泌功能的影响,探讨其可能的作用机制.方法 体外培养小鼠胰岛素瘤细胞(NIT-1)至指数增长期,根据干预方案进行分组:正常细胞组、IL-1β/IFN-γ组、罗格列酮(RSG)或吡格列酮(PIG)+IL-1β/IFN-γ组、RSG或PIG+IL-1β/IFN-γ+GW9662组.采用Hoechst33342染色观察细胞凋亡形态变化、膜联蛋白V-FITC/PI检测凋亡率、ELISA检测胰岛素分泌,观察RSG和PIG对IL-1β和IFN-γ损伤β细胞的保护作用.结果 RSG或PIG+IL-1β/IFN-γ组凋亡率明显降低(14.0%、16.7%),与IL-1β/IFN-γ组比较差异有统计学意义(51.3%,P<0.01);RSG或PIG+IL-1 β和IFN-γ+GW9662组凋亡率明显升高(41.4%、44.7%),与RSG或PIG+IL-1β/IFN-γ组比较差异有统计学意义(P<0.01);同样,RSG或PIG+IL-1β/IFN-γ组葡萄糖刺激胰岛素分泌能力(GSIS)明显恢复[(6.8±0.7)ng/ml、(5.9±0.9)ng/ml],与IL-1β/IFN-γ组(3.6±0.5 ng/mJ)比较差异有统计学意义(P<0.01);RSG或PIG+IL-1β和IFN-γ+GW9662组GSIS明显降低[(3.9±0.4)ng/ml、(3.6±0.3)ng/ml],与RSG或PIG+IL-1β/IFN-γ组比较差异有统计学意义(P<0.01).结论 TZD可以抑制细胞因子诱导的胰岛β细胞凋亡和恢复β细胞的胰岛素分泌功能,其机制可能与抑制半胱氨酸水解酶-3的活性有关.