丝裂素活化蛋白激酶反义寡核苷酸对血管紧张素Ⅱ诱导的大鼠心肌？…

AIM: To investigate the inhibitory effect of down-regulating mitogen activated protein kinase (MAPK) on c-myc gene expression and further on cardiac fibroblast proliferation. METHODS: Cultured neonatal rat cardiac fibroblasts was pretreated with a phosphorothioate-protected 17-mer antisense MAPK oligodeoxynucleotide (ODN) directed against the initiation of translation sites of the p42 and p44 MAPK isoforms by liposomal transfection. A 17-mer sense and mismatch sequence MAPK ODN were used as controls. After liposomal transfecting, cells were exposed to angiotensin II (Ang II) 10 nmol.L-1 for 5 min and then harvested in lysis buffer. MAPK activity was measured by Western blot and P-81 phosphocellulose filter paper method by using [gamma-32P]ATP and myelin basic protein as substrates. c-myc mRNA expression stimulated by Ang II for 30 min was measured by Northern blot. DNA synthesis and collagen protein synthesis induced by Ang II for 24 h were measured by [3H]thymidine incorporation and [3H]Proline incorporation, respectively. RESULTS: Antisense ODN 0.2 mumol.L-1 reduced Ang II-induced MAPK activities by 72%, MAPK protein expression by 80%, and suppressed c-myc mRNA expression by 97%, respectively. [3H]thymidine incorporation and [3H]proline incorporation in Ang II-induced cardiac fibroblast were inhibited by 59% and 58%, respectively. CONCLUSION: A 17-mer MAPK antisense oligonucleotide directed againsts the initiation of translation sites of MAPK could specifically inhibit Ang II-stimulated cultured neonatal rat cardiac fibroblast proliferation through down-regulating MAPK activity and further depleting c-myc mRNA expression.     

CCDPK反义寡核苷酸抑制bFGF诱导的大鼠血管平滑肌细胞增殖(英文)

AIM: To investigate the role of Ca(2+)-calmodulin dependent protein kinase (CCDPK) on basic fibroblast growth factor (bFGF)-induced vascular smooth muscle cell (VSMC) proliferation and the inhibitory effect of antisense CCDPK oligonucleotides (ODN). METHODS: Before being exposed to bFGF, cultured rat VSMC CCDPK activity was inhibited by pretreatment with either a phosphorothioate-protected 17-mer antisense CCDPK ODN-directed against the initiation of translation sites of the p42 and p44 CCDPK isoform or with CCDPK kinase inhibitor PD98059. All ODN were introduced into cells by liposomal transfection. DNA synthesis was measured by [3H]thymidine incorporation. P44- and p42-CCDPK protein expression and phosphorylation were measured by Western blot. RESULTS: PD98059 inhibited bFGF-induced phosphorylation of CCDPK and DNA synthesis. Antisense CCDPK ODN 0.2-0.8 mumol.L-1 reduced both p44- and p42-CCDPK expression and phosphorylation of CCDPK in a concentration-dependent manner and DNA synthesis induced by bFGF. Lipofectin alone or sense and random CCDPK ODN did not affect p44- and p42-CCDPK protein expression or bFGF-induced phosphorylation of CCDPK or DNA synthesis. CONCLUSION: bFGF-stimulated rat VSMC proliferation is mediated by CCDPK. The antisense CCDPK ODN can inhibit bFGF-induced VSMC proliferation through down-regulating p44- and p42-CCDPK level.     

Target selectivity of MAPK phosphorothioate antisense ODN on p42/p44, p38 MAPK, and JNK protein expression and its inhibitory effect on VSMC DNA synthesis.

AIM: To analyze the target selective and sequence-specific inhibitory effect of mitogen-activated protein kinase (MAPK) phosphorothioate antisense oligodeoxynucleotides (ODN) on p42/p44, p38 MAPK, c-jun NH2-terminal protein kinases (JNK) protein expression, and DNA synthesis in vascular smooth muscle cell (VSMC). METHODS: Using a phosphorothioate-protected 17-mer antisense MAPK ODN directed against the initiation of translation sites of the p42/p44 MAPK isoforms by liposomal transfection to deplete cultured rat, rabbit, and fetal calf VSMC MAP kinases. The 17-mer sense and random sequence MAPK ODN were used as controls. After liposomal transfection, cells were exposed to 20% serum for 24 h, and then harvested in lysis buffer. P42/p44, p38 MAPK, and p46/p58 JNK protein expression were measured by Western blot. DNA synthesis was measured by [3H]thymidine incorporation. RESULTS: Treatment with MAPK antisense ODN (0.1-0.8 mumol.L-1) for 48 h reduced phosphored p42/p44 MAPK protein expression but without effect on p38 MAPK and JNK expression, and inhibited cultured rat, rabbit, and fetal calf VSMC [3H]thymidine incorporation stimulated by 20% serum in a concentration-dependent manner. CONCLUSION: The MAPK antisense ODN target-selectively and sequence-specifically reduces the p42/p44 MAPK protein expression and concentration-dependently inhibits proliferation of rat, rabbit and fetal calf VSMC.     

丝裂素活化的蛋白激酶反义寡核苷酸抑制表皮生长因子诱导体外 …

目的：探讨丝裂素活化的蛋白激酶（ＮＡＰＫ）反义寡核苷（ＯＤＮ）对表皮生长因子（ＥＧＦ）诱导的培养大鼠血管平滑肌细胞增生的抑制作用。方法：用脂质体将Ｐ４２－和Ｐ４４－ＭＡＰＫ ＯＤＮ０．２μｍｏｌˉＬ＾－１转染入大鼠血管平滑肌细胞，设正义及随机ＯＤＮ为对照，用Ｗｅｓｔｅｒｎ Ｂｌｏｔ法结合Ｐ－８１滤纸法以髓磷脂碱性蛋白为底物测定ＭＡＰＫ活性。［＾３Ｈ］胸腺嘧啶核苷酸掺入测定平滑肌细胞ＤＮＡ合成。结果     

丝裂素活化的蛋白激酶反义寡脱氧核苷酸防治血管内膜增殖

目的：探讨Ca^2 -钙调蛋白依赖性蛋白激酶（丝裂素活化的蛋白激酶）（CCDPK）在生长因子诱导体外培养大鼠血管平滑肌细胞增殖中的作用及反义CCDPK寡脱氧核苷酸（ODN）对球囊损伤后大白鼠血管内膜增生的抑制作用。方法：利用脂质体转染17－mer CCDPK反义ODN进入培养的血管平滑肌细胞以抑制CCDPK活性,设正义及随机ODN作对照。用蛋白质印迹法测定CCDPK表达。[^3H]胸腺嘧啶核苷酸掺入测定平滑肌细胞DNA合成。用2F球囊导管造成大白鼠颈动脉再狭窄模型,利用多聚胶F127－ODN系统由血管外膜部位给药。于损伤后2周取样,固定及HE染色观察内膜增生情况。FITC标记的ODN观察体内外给药方法的分布及吸收情况。结果：CCDPK反义ODN能明显抑制PDGF及ET诱导的CCDPK蛋白表达及[^3H]胸腺嘧啶核苷酸掺入。在大鼠颈动脉再狭窄模型,能明显抑制血管内膜增生。结论：CCDPK介导了PDGF及ET诱导的血管平滑肌细胞增殖。针对p42-和p44-CCDPK起始部位设计的17－mer反义ODN能有效抑制生长因子诱导的血管平滑肌细胞的增殖及球囊损伤大鼠血管内膜增生。     

Inhibitory effect of antisense oligodeoxynucleotide to p44／p42 MAPK on angiotensin II-induced hypertrophic response in cultured neonatal rat cardiac myocyte

AIM: To explore the inhibitory effect of antisense oligonucleotide (ODN) to mitogen activated protein kinase(MAPK) on cardiomyocyte hypertrophy induced by angiotensin Ⅱ (Ang Ⅱ). METHODS: A 17-mer phosphorothioate-protected antisense ODN directed against the initiation of translation sites of the p42 and p44 MAPK isoforms byliposomal transfection was applied to inhibit the translation of p44/p42 MAPK mRNA. The sense and random ODNs to p44/p42MAPK were used as sequence controls. Neonatal cardiac myocytes were exposed to Ang Ⅱ (10nmol/L) for 5 min and then harvested in lysis buffer for the measurement of the activity and the phosphorylated protein content of p44/p42MAPK that were tested by P-81 phosphocellulose filter paper method and Western blotting, respectively. The rate of protein synthesis by [^3H]leucine incorporation and the diameter of cell were measured after exposure to Ang Ⅱ for 24 h and 72 h, respectively. RESULTS: In cardiac myocyte Ang Ⅱ increased p44/p42MAPK activity and phosphorylated protein content by 140 % and 699 %, and also increased [^3H]leucine incorporation and cell diameter by 40 % and 27 %. c-fos and c-myc mRNAs were induced significantly after exposure to Ang Ⅱ. Antisense ODN to p44/p42MAPK (0.2 μmol/L) reduced Ang Ⅱ-induced MAPK activity by 30 %,and phophorylated MAPK protein expression by 59 % in cardiac myocyte, and inhibited c-fos and c-myc mRNA expression induced by Ang Ⅱ by 44 % and 43 %, respectively. The diameter and the rate of protein synthesis of cardiac myocyte induced by Ang Ⅱ were decreased by 16 % and 22 % after pretreatment with antisense ODN to p44/p42MAPK. CONCLUSION: Antisense ODN to p44/p42 MAPK inhibited the increase of rate of protein synthesis,and the augmentation of cell diameter and expression of c-fos and c-myc mRNA induced by Ang Ⅱ in culturedcardiac myocytes, p44/p42 MAPK played a critical role in the hypertrophic response induced by Ang Ⅱ in cultured neonatal rat cardiac myocytes.     

血小板源生生长因子刺激血管平滑肌细胞增殖及其分子机制

目的：探讨血小板源生生长因子（PDGF－BB）刺激血管平滑肌细胞（VSMC）增殖及其分子机制。方法：用Western Blot法测定p44/p42 CCDPK活性。[^3H]脱氧胸腺嘧啶核苷酸掺入测定VSMC DNA合成。原位杂交检测c-myc mRNA的表达。结果：PDGFBB诱导的磷酸化CCDPK蛋白表达和[^3H]脱氧胸腺嘧啶核苷酸掺入呈浓度依赖性,此作用可被PTK抑制剂Genistein,外钙络合剂依他酸和MEK抑制剂PD 98059抑制。PDGF－BB刺激可引起c-myc mRNA的明显表达,此作用可被PD 98059抑制。结论：PDGF－BB通过激活p44/p42 CCDPK,上调c-myc mRNA的表达从而促进VSMC增殖,其作用是由PTK和Ca^2 介导的。     

丹酚酸A对培养的大鼠肝星状细胞增殖与胶原生成的作用(英文)

目的:研究丹酚酸A对培养的大鼠肝星状细胞增殖与胶原生成的影响。方法:用链酶蛋白酶与胶原酶对肝脏进行原位灌流消化,Nycodenz密度梯度离心分离大鼠肝星状细胞,传一代培养。MTT法与[~3H]TdR掺入法测定细胞增殖。丽春红染色、图象分析法半定量细胞胶原沉积量,ELISA法测定细胞培养上清中Ⅰ型胶原分泌量,检测细胞层总蛋白量校正细胞数。RT-PCR法分析前胶原α_2(Ⅰ)基因的表达。结果:丹酚酸A 100μmol/L引起部分细胞脱壁与死亡,有一定毒性反应。丹酚酸A 0.1-10μmol/L对细胞形态无明显影响。丹酚酸A1-100μmol/L浓度依赖性抑制细胞增殖,降低胶原沉积量与Ⅰ型胶原分泌量。丹酚酸A1-10μmol/L对前胶原α_2(Ⅰ)mRNA表达均有明显抑制作用。结论:丹酚酸A抑制肝星状细胞增殖与胶原表达,是丹参抗肝纤维化的主要有效成分之一,抑制肝星状细胞活化是其抗肝纤维化的主要作用机制。