有丝分裂蛋白激酶及其上游调节信号在人肝癌组织中的表达

目的本研究检测了肝癌和癌旁肝组织中ERK1、ERK2、JNK1、p38及其上游MEK1、MEK2的蛋白表达量.方法手术切除16例肝癌及癌旁肝组织标本,Western印迹检测ERK1、ERK2、JNK1、p38和MEK1、MEK2蛋白含量.结果每例患者肝癌组织中ERK1、ERK2、p38蛋白表达显著高于癌旁肝组织,在肝癌和癌旁肝组织中ERK1积分光密度值(integralopticdensity,IOD)分别为300±98和98±48(P＜0.01);ERK2的IOD值分别为587±83和232±96(P＜0.01);p38的IOD值分别为270±85和107±87(P＜0.01);JNK1的IOD值分别为111±93和292±109(P＜0.01);肝癌组织中JNK1蛋白表达显著低于癌旁肝组织,MEK1、MEK2蛋白表达显著高于癌旁肝组织,MEK1的IOD值在肝癌组织中JNK1蛋白表达显著低于癌旁肝组织,分别为1*!418±244和805±90(P＜0.01),MEK2的IOD值分别为1*!041±122和468±40(P<0.005).结论在肝癌组织中细胞分裂增殖的信号传导通路ERK1、ERK2、p38、MEK1、MEK2激酶处于高表达,JNK1激酶在肝癌组织中处于低表达,它们的失衡是导致肝癌细胞生长失控和无限增殖的重要原因之一.     

人肝癌组织中核内转录基因Fos B和Jun D的表达及其意义

目的　探讨Fos和Jun的表达产物与人肝细胞癌发生、发展的关系。　方法　采用免疫组织化学S-P法和蛋白电泳技术对20例肝癌病人癌及癌旁组织中Fos和Jun核内癌蛋白的表达情况进行检测。结果　Westernblot结果示20例标本中有16例肝癌组织FosB、JunD蛋白含量高于癌旁组织。FosB光密度值在肝癌及癌旁组织中分别为2396±803和894±319,差异有显著意义（P＜0.01）;JunD光密度值在肝癌及癌旁组织中分别为1973±725和776±161,差异有显著意义（P＜0.05）。免疫组织化学结果显示FosB和JunD蛋白在肝癌组织细胞核中同步表达。　结论　在人原发性肝细胞癌组织中,核内转录基因FosB、JunD表达产物表达强度明显增高,这可能是肝细胞早期恶变的重要原因之一。     

细胞外信号调节激酶及其上游激酶在人乳腺癌发生发展中的意义

目的　研究人乳腺癌组织、良性肿瘤以及瘤旁乳腺组织中细胞外信号调节激酶 (ERK1、ERK2 )及其上游激酶 (MEK1、MEK2 )的表达 ,以及术前化疗对MEK1、MEK2、ERK1、ERK2蛋白表达的影响。　方法　应用蛋白质印迹法检测 5 6例患者乳腺癌组织、8例乳腺良性肿瘤以及相应瘤旁组织中MEK1、MEK2及ERK1、ERK2蛋白的表达情况 ,其中 16例患者术前接受环磷酰胺 ,表阿霉素加 5 氟脲嘧啶或泰素加表阿霉素方案化疗。应用免疫组织化学方法检测乳腺癌组织及癌旁组织中MEK1、MEK2及ERK1、ERK2蛋白的表达。　结果　 4 0例未行术前化疗的乳腺癌组织中MEK2、ERK1、ERK2蛋白表达水平高于癌旁组织 ,分别为癌旁组织的 4 76、1 4 8和 2 0 9倍 (t值分别为 7 2 4 4 ,5 95 9,3 735 ,P <0 0 1) ;MEK1水平低于相应癌旁组织 (t=2 2 0 6 ,P <0 0 5 ) ;未行术前化疗的乳腺癌组织中MEK2、ERK1、ERK2蛋白表达水平高于乳腺良性肿瘤 (t值分别为 2 932 ,2 0 82 ,2 0 2 1,P <0 0 5 ) ;MEK1水平低于良性肿瘤 (t=2 0 75 ,P <0 0 5 ) ;雌激素受体阴性的乳腺癌中MEK2蛋白表达水平高于雌激素受体阳性的肿瘤 (t=2 4 0 ,P <0 0 5 ) ,MEK1蛋白表达水平低于雌激素受体阳性的肿瘤 (t =2 5 8,P <0 0 1) ;术前化疗的乳腺癌组织中MEK2蛋白表达     

细胞外信号调节激酶和P38蛋白激酶在自体移植静脉中的表达

目的研究丝裂原活化蛋白激酶亚单位细胞外信号调节激酶(ERK)和p38蛋白激酶(p38 MAPK)在移植静脉血管重塑过程中的表达.方法选Wistar大鼠80只,建立自体移植静脉模型,术后随机分为6 h、24 h、3 d、7 d、2周、4周、6周及8周组,于相应时点取材,半定量逆转录PCR法检测移植血管中ERK和p38 MAPK的mRNA表达;Western蛋白印迹定量检测ERK和p38 MAPK的蛋白产物及磷酸化蛋白产物表达;脱氧核苷酸末端转移酶末端标记法(TUNEL)检测血管平滑肌细胞(VSMC)凋亡的变化;免疫组化检测增殖细胞核抗原(PCNA)的表达.结果移植静脉术后6 h,ERK1和p38 MAPK的mRNA表达均明显增强,与正常静脉组比较差异均有显著性意义(P＜0.01);ERK1mRNA表达在移植后7 d达高峰,表达值为(33.2±14.2)%,p38 MAPK的mRNA表达于术后2周达到高峰,表达值为(58.8±26.2)%,与其余各时点比较差异有显著性意义(P＜0.01).Western蛋白印迹提示ERK1/2在术后1～2周达高峰,6周时逐渐恢复至正常水平;而p38 MAPK则在移植后2～4周达高峰,之后开始减少,8周时仍维持一定表达量(1/4～1/2).ERK1与PCNA表达呈正相关(r=0.759 6,P＜0.01),p38 MAPK与凋亡呈正相关(r=0.892 2,P＜0.01).结论MAPK的激活是移植静脉内膜增生以及血管重塑的关键环节,可能成为防治移植静脉狭窄、闭塞的新的治疗靶点.     

原发性肝细胞肝癌血小板源性生长因子的表达和肿瘤血管形成关系的相关研究

目的　初步探讨肝细胞性肝癌组织中血小板源性生长因子(platelet derived growthfactor,PDGF)及血管内皮细胞生长因子(vascular endothelial cell growth factor,VEGF)的表达与微血管密度(micro vessel density,MVD)的表达之间的关系。方法　对51 例肝癌组织及癌旁非肿瘤组织,20例正常肝组织,采用免疫组化(SABC法)检测PDGF、VEGF和CD34的表达。采用ELISA法,检测48例术前肝癌患者和16例肝内胆管结石患者血清中PDGF的浓度。结果　PDGF、VEGF在肝细胞癌组织中的阳性表达率分别为54.9%、64.7%,在癌旁非肿瘤组织中分别为 27.5%、37.3%,在正常肝组织中分别为5%、10%,三者之间比较差异有显著性意义(P<0.01),PDGF、VEGF阳性表达率与肝细胞癌的转移(P=0.031,P=0.04)、包膜形成(P=0.035, P=0.016)以及细胞分化程度(P=0.02,P=0.034)有关;与性别、年龄、肿瘤的大小没有关联。肝癌组织、癌旁组织和正常肝组织的MVD值分别是29.43±4.818、15.23±2.77(P<0.01)、14.56±1.96(P<0.01)。术前肝癌患者和肝内胆管结石患者血清中PDGF的浓度分别为458.33±303.17、125.00±92.69,二组之间比较有显著差异(P<0.05)。结论　PDGF在肝癌的发生,发展和浸润过程中可能起着重要促生长和转移作用,并且和VEGF可能存在一定的协同作用。     

凋亡抑制基因x-相关细胞凋亡抑制蛋白基因在肝癌细胞中的表达及临床意义

目的探讨x-相关细胞凋亡抑制蛋白基因（XIAP）mRNA及蛋白在肝癌组织和癌旁组织中的表达情况，及其与肝癌发生的关系。方法肝癌患者手术切除标本10例，应用半定量逆转录．聚合酶链反应（RT-PCR）分别检测肝癌组织和癌旁组织细胞XIAP mRNA基因的相对表达量，并通过免疫组织化学SP法检测10例肝癌组织和癌旁组织标本XIAP蛋白的表达情况。结果（1）半定量RT-PCR显示：XIAP基因在肝癌组织中均呈高表达，相对表达量为3．211±2．43，而在对应的癌旁组织中呈低表达或无表达，相对表达量为1．947±1．890，两组之间差异有统计学意义（P〈0．05）。（2）免疫组织化学及图像分析结果显示：在肝癌组织和癌旁组织中XIAP蛋白平均灰度扫描值分别为161．800±29．470和144．240±26．290，两组之间差异有统计学意义（P〈0．01）。结论XIAP在肝癌中的表达明显增高，可能在肝癌的发生、发展过程中发挥重要作用。     

利用组织芯片技术研究酪氨酸蛋白激酶在肝癌组织中的表达及意义

目的 观察酪氨酸蛋白激酶ERK、P38、C-jun、JAK2、STAT3、STAT5在肝癌组织中的表达及相互关系,探讨酪氨酸蛋白激酶表达与肝癌病人临床特征之间的关系.方法 收集原发性肝癌手术切除标本30例,制作组织芯片,以肝硬化组织作对照,采用免疫组化SP法研究酪氨酸蛋白激酶ERK、P38、C-jun、JAK2、STAT3、STAT5在肝癌组织与肝硬化组织中的表达.结果 ERK、P38、C-jun、JAK2、STAT3、STAT5在肝癌组织中的表达平均光密度值分别为(0.220±0.033,0.174±0.024,0.183±0.064,0.192±0.044.0.197±0.078,0.181±0.066),显著高于肝硬化组(0.065±0.028,0.058±0.028,0.042±0.016,0.070±0.030,0.052±0.024,0.052±0.023,P＜0.01).ERK与C-jun、JAK2、STAT3、STAT5在肝癌组织中表达呈显著正相关,(P＜0.01或P＜0.05),与P38呈显著负相关(r=0.404,P＜0.05).JAK2的过度表达与肝癌组织中细胞的分化程度有关,在低分化肝癌组织中表达显著率高于高中分化肝癌组织.结论 MAPK和JAK-STAT通路的过度活化在肝癌发生发展过程中起重要作用,细胞信号转导系统失去正常的协调平衡可能是导致肿瘤发生的重要原因.     

肝癌侵袭转移与新的长链非编码RNA UC001kfo的关系

目的 探讨新的长链非编码RNA(lncRNA) UC001 kfo在肝癌中的表达及与肝癌侵袭、转移的关系.方法 收集肝脏组织60例,分为肝硬化组、肝癌组、癌旁组、门静脉转移肝癌组.原位杂交检测UC001 kfo和ACTA2(α-平滑肌肌动蛋白的基因)在肝癌组织的表达.结果 UC001kfo在肝硬化组不表达或低表达,在其他3组均为阳性表达,以上4组的表达值分别为113.30±11.79、137.59±6.23、148.78±8.23、160.28 ±9.47,方差分析显示UC001kfo表达差异有统计学意义(P＜0.01),4组间的差异有统计学意义(P＜0.01),分别为肝硬化组＜癌旁组织＜肝癌组＜门脉癌栓组.ACTA2的表达分别为109.89±9.74、125.22±32.16、149.06±8.43、156.57±8.86,ACTA2表达差异有统计学意义(P＜0.01),4组间差异有统计学意义(P＜0.05),表达分别为肝硬化组＜癌旁组织＜肝癌组＜门脉癌栓组.结论 UC001 kfo和ACTA2在肝癌中表达明显增加,特别是门静脉癌栓组,UC001kfo可能通过调控ACTA2的表达促进肝癌的侵袭转移.     

细胞外信号调节蛋白激酶、c-Jun氨基末端蛋白激酶在人肝硬化肝癌组织中的表达

目的 观察人肝硬化肝癌组织中丝裂原活化蛋白激酶家族两种主要亚型细胞外信号调节蛋白激酶(ERK)、c-Jun氨基末端蛋白激酶(JNK)的表达.方法 应用半定量逆转录-聚合酶链反应(RT-PCR)方法检测10例人中晚期肝硬化肝癌及其癌旁正常组织中ERK、JNK mRNA的相对表达量,并采用Western blot检测上述组织中ERK、JNK蛋白产物表达.结果 90%(9/10)的肝癌组织中ERK、JNK mRNA和蛋白表达增强,而癌旁组织中80%(8/10)该基因表达缺失和蛋白表达减少,两者差异有统计学意义(P<0.05).结论 肝硬化肝癌组织中ERK、JNK表达处于活化状态,可能在肝硬化肝癌的发生、发展过程中发挥重要作用.     

gax和HIF-1α基因在原发性肝癌组织中的表达及意义

目的探讨同源盒基因(gax)和缺氧诱导因子(HIF1α)表达产物与原发性肝癌发生、发展的关系。方法采用逆转录聚合酶链反应(RTPCR)和蛋白质印迹技术(Westernblot)分别检测20例原发性肝癌患者癌及癌旁肝组织中gax和HIF1α的mRNA以及蛋白质表达水平。结果肝癌组织中HIF1αmRNA(118.1±33.2)及蛋白表达(10.86±2.76)水平显著高于癌旁组织(分别为42.7±10.5与3.52±1.53,P均<0.05);肝癌组织中gaxmRNA表达(39.5±13.8)及其蛋白表达(4.10±1.26)水平低于癌旁组织(P均<0.05)。结论gax和HIF1α基因是调控肝癌组织血管生长的重要基因之一,与gax表达下调及HIF1α表达下调肝癌发生发展密切相关。     

The effects of genistein on tyrosine protein kinase-mitogen activated protein kinase signal transduction pathway in hypertrophic scar fibroblasts

OBJECTIVE: To investigate the inhibitory effects of genistein on tyrosine protein kinase (TPK)-mitogen activated protein kinase (MAPK) signal transduction pathway in hypertrophic scar fibroblasts (HSFb), in order to explore the molecular mechanism of inhibition of scar hyperplasia by genistein. METHODS: HSFbs were isolated from human hypertrophic scar tissues and cultured in vitro. The cells were treated by genistein in different concentrations (25, 50, 100 micromol/L, respectively), followed by basic fibroblast growth factor (bFGF) stimulation. The activity of TPK was assessed with [gamma-32P] ATP substrate incorporation. The phosphorylation protein expression levels of main signal molecules in TPK-Ras-MAPK pathway including c-Raf, MEKl/2, extracellular signal regulated kinase (ERK), p38MAPK, c-Jun N-terminal kinase (JNK) were determined by Western blot. HSFbs treated with dimethylsulfoxid (DMSO) were used as control group. RESULTS: After being treated with genistein in concentration of 25, 50, 100 micromol/L, the activity of TPK in HSFbs was depressed significantly [(7.15 +/- 0.35) x 10(5), (5.62 +/- 0.88) x 10(5), (5.62 +/-0.88) x 10(5) 10(5) pmol x min(-1) x mg(-1), respectively] when compared with that in control group [(8.92 +/- 0.28) x 10(5) pmol x min(-1) x mg(-1), P < 0.05]. Compared with those in control group,the phosphorylation protein expression levels of c-Raf, MEK1/2, ERK1/2 and p38 MAPK were lowered in different degree (P < 0.05 or P < 0.01) after genistein treatment. The phospho-JNK levels after treatment with genistein were similar to that of control group. Under the condition of pretreatment with genistein, the activities of TPK and signal pathway protein expressions in HSFb showed a downward trend after stimulation with bFGF. CONCLUSION: Genistein can effect the proliferation and activation of HSFb by inhibiting the phosphorylation of receptor of TPK signal transduction pathway (TPK --> Raf --> MEK --> ERK/p38).     

17beta-estradiol differentially activates mitogen-activated protein-kinases and improves survival following reperfusion injury of reduced-size liver in mice

Ischemia-reperfusion injury (I/R-I), which is unavoidable in liver transplantation, impairs liver regeneration and predisposes to liver failure. The three major mitogen-activated protein-kinases (MAPKs): ERK, p38, and JNK, are critical in the transmission of signals triggered by proinflammatory cytokines, by stress, and by growth factors. JNK and p38alpha activation have been associated with apoptosis; p38beta with cell survival; and ERK with proliferation. Previous studies have demonstrated gender dimorphism in hepatocellular dysfunction after experimental trauma and hemorrhage. Female mice are protected to a much greater extent from I/R-I than male mice. We assessed the effects of 17beta-estradiol (17beta-E) on liver function, host survival, and cellular activation of MAPK in a murine model of I/R-I in reduced-size livers. C57BL/6 mice were subjected to 45 minutes of warm ischemia (70% of the liver mass). After reperfusion, the nonischemic lobes were excised. Vehicle, 17beta-E or the estrogen receptor antagonist ICI-182780, was delivered 1 hour before the injury. We evaluated AST and apoptosis as well as activation of JNK, p38, and ERK. Female mice showed a lower level of hepatocellular injury (AST = 445 +/- 82 IU/L) after I/R-I compared with male mice (AST = 1400 +/- 210). 17beta-E decreased the liver injury in male mice (AST = 522 +/- 77), an effect that was partially reversed by ICI-182,780 (910 +/- 92). A higher rate of apoptosis was observed in male animals given saline (enrichment factor = 7.22 +/- 0.8) versus those treated with 17beta-E (5.85 +/- 0.3, P < .05). A significant increase in liver regeneration, as assessed by the percentage of liver weight/body weight was demonstrated in females (184% +/- 24%) and male mice given 17beta-E (168% +/- 22%) compared with male mice given vehicle (9% +/- 4%). 17beta-E significantly down-regulated JNK and p38alpha activities, whereas I/R-I promoted p38beta and ERK activation. These results suggest that the cytoprotective effects of 17beta-E on I/R-I to reduced-size livers are associated with selective modulation of MAPK kinases.     

三羟基异黄酮对增生性瘢痕成纤维细胞受体型酪氨酸蛋白激酶-丝裂原活化蛋白激酶信号通路的影响

目的 了解5,7,4'-三羟基异黄酮(genistein)对增生性瘢痕成纤维细胞(HSFb)内受体型酪氨酸蛋白激酶-丝裂原活化蛋白激酶(TPK-MAPK)信号转导通路的影响,探讨genistein抑制瘢痕增生的分子机制. 方法体外分离培养HSFb,以不同浓度genistein(25、50、100μmol/L)处理细胞,再加入10 μg/L碱性成纤维细胞生长因子(bFGF)刺激,用[γ-32P]腺苷三磷酸底物掺入法检测细胞TPK活性;用蛋白质印迹法检测TPK-MAPK通路中主要信号蛋白分子c-Raf、丝裂原激活蛋白激酶激酶(MEK)、细胞外信号调节激酶(ERK)、p38 MAPK、c-Jun氨基末端激酶(JNK)磷酸化蛋白的表达变化.以二甲亚砜溶剂处理的HSFb为对照组. 结果 25、50、100μmol/L genistein作用后,HSFb内TPK活性分别为(7.15±0.35)、(5.62±0.88)、(3.17±0.94)×105 pmol·min-1·mg-1,与对照组(8.92±0.28)×105 pmol·min-1·mg-1比较,差异有统计学意义(P<0.05或P<0.01);细胞内磷酸化c-Raf、MEK1/2、ERK1/2、p38蛋白的含量均有不同程度降低,与对照组比较,差异有统计学意义(P<0.05或P<0.01).genistein各剂量组磷酸化JNK蛋白含量与对照组近似.在genistein预处理前提下,加入bFGF刺激的细胞内TPK活性及各信号蛋白的表达亦呈下降趋势. 结论 genistein可通过抑制细胞受体TPK信号转导途径影响HSFb的增殖与活化,主要信号通路可能为TPK→Raf→MEK→ERK/p38途径.     

Cardiac hypertrophy in the Prague-hypertensive rat is associated with enhanced JNK2 but not ERK tissue activity

Mitogen-activated protein (MAP) kinases are important intracellular mediators for proliferation and hypertrophy and therefore may also regulate cardiomyoblast growth in hypertensive heart disease. Thus, the aim of the present study was to examine the activities of MAP kinases, namely extracellular signal-regulated kinase (ERK)1,2, c-Jun NH2-terminal kinases (JNK)1,2 and p38 MAP kinase, in myocardial tissue of 12-week-old Prague normotensive (PNR) and hypertensive rats (PHR), a model of genetic hypertension with marked cardiac hypertrophy. Systolic blood pressure was 121 +/- 5 in PNR and 208 +/- 15 mm Hg in PHR (p < 0.01). Total heart weight was 247 +/- 4 in PNR vs. 316 +/- 4 mg/100 g body weight in PHR (p < 0.01). Left and right ventricular weights were 121 +/- 5 and 53 +/- 3 in PNR vs. 168 +/- 4 (p < 0.01) and 57 +/- 2 mg/100 g body weight (n.s.) in PHR. Using anti-ERK2 Western blot analysis as well as immunocomplex ERK activity assay, we found no activation of ERK2 in left or right ventricular tissue of PHR and PNR. Similary, p38 MAP kinase phosphorylation and activity were not detectable. In contrast, Western blot analysis using antiphospho-JNK antibodies revealed in myocardial tissue of right and left ventricles significantly greater phosphorylation of JNK2 in PHR than in PNR. This finding was confirmed by immunocomplex JNK activity assay using ATF-2 as substrate, which demonstrated a significant increase in JNK activity in the left ventricle of PHR as compared to PNR (6.4 +/- 1.5 vs. 2.5 +/- 0.5 OD; each n = 5; p < 0.05). In conclusion, cardiac JNK2 seems to be regulated differently from ERK2 in this rat model. In PHR, as compared to PNR, we found enhanced activity of JNK2 in the left and right ventricles suggesting that JNK2 is involved in hypertensive cardiac disease. The rise in JNK in both ventricles may result indirectly from humoral stimuli, e.g., endothelin-1 and/or angiotensin II, and may contribute to ventricular hypertrophy in this model of spontaneous hypertension.     

双歧杆菌对实验性大肠癌丝裂素活化蛋白激酶和激活蛋白-1的影响

目的 探索青春型双歧杆菌的体内抑瘤机制。方法 以激光共聚焦显微镜检测了大肠癌裸鼠移植瘤细胞外信号调节蛋白激酶(ERK)1/2、c-jun氨基末端激酶(JNK)和p38以及激活蛋白-1(AP-1)的主要成份 c-fos和c-jun的含量。结果 大肠癌裸鼠移植瘤经双歧杆菌处理后,其ERK1/2、JNK、c-fos和c-jun的平均荧光强度均显著低于肿瘤对照组(P<0.01),而p38的平均荧光强度在两组间差异无显著性(P>0.05)。结论 青春型双歧杆菌体内能明显降低大肠癌ERK1/2和JNK的活性以及c-fos和c-jun的表达。     

Interleukin-17--induced interleukin-8 release in human airway smooth muscle cells: role for mitogen-activated kinases and nuclear factor-kappaB.

BACKGROUND: It has recently become clear that interleukin (IL)-8 plays a role in chronic neutrophilic inflammatory disorders, such as chronic rejection after lung transplantation. We have shown that IL-17--stimulated human airway smooth muscle cells (HASMC) are able to produce IL-8. The aim of this study was to determine whether p38 mitogen-activated protein kinase (MAPK), c-Jun amino-terminal kinase (JNK), p42/p44 extracellular signal-related kinase (ERK) and nuclear factor-kappaB (NF-kappaB) are involved in IL-17--induced IL-8 production in HASMC in vitro. METHODS: We used human airway smooth muscle cells in culture. Western blotting was done to obtain data regarding activation of MAPK. Furthermore, we used specific inhibitors of MAPK to investigate their involvement in IL-17--induced IL-8 release, which was measured by enzyme-linked immunosorbent assay (ELISA). RESULTS: Western blotting clearly demonstrated that p38 MAPK, JNK and p42/p44 ERK were activated by IL-17 in HASMC. Using SB203580, a specific inhibitor of p38 MAPK, we detected a concentration-dependent inhibition of IL-17--induced IL-8 production with a maximal decrease of 63 +/- 5% (n=8, p<0.01). Curcumin, a specific inhibitor of JNK, also concentration-dependently reduced IL-17--induced IL-8 production, with a maximal decrease of 82+/-4% (n=8, p<0.01). U0126, a specific inhibitor of p42/p44 ERK, induced a maximal decrease of 84+/-5% (n=8, p<0.001). Pyrrolydine dithiocarbamate (PDTC), an inhibitor of NF-kappaB, caused a 70+/-5% (n=8, p<0.01) decrease in IL-17--induced IL-8 production. CONCLUSIONS: We found that IL-17 induces activation of p38MAPK, JNK and p42/p44ERK in HASMC. We also found that p38MAPK, JNK, p42/p44 ERK and NF-kappaB play an important role in IL-17--induced IL-8 production in HASMC in vitro. This may open up new opportunities for further treatment of this disease.     

EphrinA1在原发性肝细胞癌中的表达及临床意义

目的探讨原发性肝细胞癌中EphrinA1的mRNA和蛋白表达水平及其临床意义。方法应用逆转录聚合酶链反应（RT-PCR）及免疫组织化学方法检测EphrinA1的mRNA及蛋白在40例肝癌及相应的癌旁肝组织和10例正常肝组织中的表达水平,并分析其与临床病理学特点之间的关系。结果40例肝癌组织及相应的癌旁肝组织和10例正常肝组织中均有EphrinA1 mRNA的表达。RT-PCR分析显示EphrinA1mRNA在肝癌组织（0．5413±0．1527）中的表达显著高于癌旁肝组织（0．3895±0．0549,P〈0．05）和正常肝组织（0．3770±0．1055,P〈0．05）,而在癌旁肝组织（0．3895±0．0549）和正常肝组织（0．3770±0．1055）中的表达差异无统计学意义（P〉0．05）。从正常肝组织、癌旁肝组织到肝癌组织,EphrinA1蛋白的阳性表达率分别为20％（2／10）、35％（14／40）和62％（25／40）,呈递增趋势（x^2=14．762,P〈0．05）。EphrinA1蛋白的过表达与肝癌细胞的分化程度、门静脉癌栓的形成及淋巴结转移等临床病理因素有关（P〈0．05）。结论EphrinA1蛋白的过表达与肝癌细胞的分化程度、淋巴结转移和门静脉癌栓有密切联系,提示其可能在肝癌的恶性转化、侵袭和转移过程中发挥重要作用。     

5-LOX抑制剂NDGA对人肝癌HepG-2细胞裸鼠移植瘤生长的影响及其机制的探讨

目的观察5-lox抑制剂去甲二氢愈创木酸(NDGA)对裸鼠人肝癌HepG-2细胞移植瘤的作用,并探讨其抗肿瘤的可能机制。方法以人肝癌细胞HepG-2制备裸鼠人肝癌移植瘤模型共18只,将18只荷瘤裸鼠随机分为三组:1、正常对照组(接种正常肝癌HepG2细胞)。2、药物组(接种正常肝癌HepG2细胞同时皮下注入5-lox抑制剂去甲二氢愈创木酸(NDGA),剂量:10μml/L NDGA 0.1ml/10g一天一次,连续5天)。3、溶媒组(接种正常HepG-2细胞后皮下注射溶质二甲亚酚)。密切观察移植瘤生长及裸鼠生存情况21天,记录各组移植瘤肿瘤体积V(V=长径×短径2×0.5),计算衰退率:肿瘤衰退率=1-干预组平均肿瘤体积比/空白对照组平均肿瘤体积比(V/Vo)。通过RT-PCR及Western-blot法检测裸鼠移植瘤组织中bcl-2、caspase3凋亡调节因子以及通路信号蛋白MEK1/2、ERK1/2等的表达。结果实验期间各组荷瘤鼠活动较好,成瘤率100%,且实验过程中无不良繁衍及裸鼠死亡;试验后分别测得各组荷瘤鼠皮下移植瘤体积及肿瘤衰退率,利用单因素方差分析及t检验可以发现:药物组荷瘤鼠较对照组及溶媒组移植瘤体积明显缩小,肿瘤衰退率明显较高,且存在统计学差异(P0.01);利用RT-PCR及Western-blot法检测发现药物组caspase3表达量较对照组及溶媒组明显增强,差异存在统计学意义(P0.01),bcl-2、ERK1/2、MEK1/2等表达量较对照组及溶媒组明显下降,差异具有统计学意义(P0.01)。结论 NDGA对于裸鼠人肝癌移植瘤具有明显的抑制效果。NDGA可能通过诱导肿瘤细胞凋亡而抑制肿瘤生长,其作用机制与抑制MEK/ERK信号通路有关。