单克隆抗体HIM82对中性粒细胞呼吸爆发的降调节作用

本研究用单抗HIM82对中性粒细胞（PMN）呼吸爆发的早期调控，发现HIM82（30μg／ml）对佛波酯（PMA）激活的PMN产生的O2-、H2O2分别可下调至（44．00±8．9）％（n=8，P＜0．01）和（65．16±15.41）％（n=8，P＜0．01），对因呼吸爆发产生的活性氧物质（reactiveoxygenspecies，ROS）引起质膜中性内肽酶（NEP）的纯化作用（inactivation）[活性下降（43．29±9．41）％，n＝8，P＜0．01]有防护作用[活性恢复至（6648±15.53）％，n=8，P＜0．05]。结果表明该单抗对PMA激发PMN呼吸爆发产生O2-、H2O2有明显的降调节作用，也表明质膜上相应分化抗原分子对PMN功能特别是对激活呼吸爆发的机构有重要影响。     

Genistein抑制兔晶体上皮细胞膜酪氨酸蛋白激酶及蛋白激酶C磷酸化的研究

目的：研究gemistein对兔晶体上皮细胞增殖及胞膜酪氨酸蛋白激酶(TPK)、蛋白激酶C(PKC)活性的影响，探索使用genitein防治后发性白内障。方法：兔晶体上皮细胞培养，应用Casnctllie改良法检测不同浓度genistein及bFGF作用后,兔晶体上皮细胞膜TPK活性的变化；同位素掺入法检测gemistein及bFGF作用后，兔晶体上皮细胞胞膜及胞浆PKC活性的变化。结果：不同浓度genistein作用后兔晶体上皮细胞TPK活性均较对照组明显下降，genistein可抑制bFGF诱导的TPK活性升高，genistein对PKC活性无明显抑制作用，但可抑制bF(求诱导的PKC活性升高。结论：gerristein在体外可通过抑制生长因子激活的蛋白激酶活性升高而抑制兔晶体上皮细胞增殖。     

蛋白激酶C对肥大细胞活化信号转导的影响

目的 :观察蛋白激酶 C (PKC)对肥大细胞 RBL - 2 H 3活化时酪氨酸磷酸化及 c- fos和 c- jun表达等信号转导的影响。方法 :采用流式细胞术和酶联免疫吸附试验测定活化的 RBL - 2 H 3细胞在佛波酯 (PMA)作用后 ,酪氨酸磷酸化和组胺浓度的改变 ;用 RT- PCR观察 PKC对 RBL - 2 H3细胞 c- fos和 c- jun基因 m RNA表达的影响。结果 :致敏 RBL - 2 H3细胞 ,在 PMA作用 48h后 ,抗原活化时磷酸化酪氨酸的平均荧光强度和组胺浓度分别为 (2 .79± 0 .0 7) %和 (6 0 .75± 1.38) nm ol/L ,都明显低于对照组的 (4 .47± 0 .0 3) %和 (10 4.47± 1.31) nm ol/L (P<0 .0 5 ) ;c- fos和 c- jun m RNA的表达量分别减少 91%和 82 %。结论 :PKC的活化可调节肥大细胞酪氨酸蛋白激酶活性 ,上调 c- fos和 c- jun m RNA的表达     

分化诱导剂对人肝癌细胞亚细胞组分酪氨酸蛋白激酶的早期 …

目的 研究双丁酰环磷酸腺苷和全反式维甲酸（ＡＴＲＡ）两种分化诱导剂地人肝癌细胞株ＳＭＭＣ－７７２１亚细胞组分中酪氨酸蛋白激酶（ＴＰＫ）的早期效应。方法 用超离心等法制备胞液，胞核和膜性ＴＰＫ酶液，以聚谷氨酸：酪氨酸４：１及γ＾３２－Ｐ－ＡＴＰ为底物测定ＴＰＫ活力，结果 对照张ｄｂ－ｃＡＭＰ处理１ｈ使ｃ－ＴＰＫ和ｎＴＰＫ和蔼同，以后对照降至原有水平，而ｄｂ－ｃＡＭＰ处理细胞的ｎ－ＴＰＫ在１２－２４ｈ     

单抗HIM82对中性粒细胞ROS损伤RBC的保护作用

目的研究单抗HIM82(30 μg/ml)是否能对PMA激活PMN后产生的ROS进行降调节,进而降低ROS对红细胞的损伤,验证HIM82对RBC损伤有无保护作用.方法用PMA激活PMN后产生的ROS对无HIM82和加HIM82保护的RBC进行损伤实验.结果加HIM82保护后的RBC膜蛋白乙酰胆碱酯酶(AchE)活性由损伤时的(71.36±22.15)%恢复到(87.60±14.78)%(n=6 P＜0.001),活性提高了16.30%;对RBC膜脂质过氧化损伤的保护作用使损伤率从(52.42±20.63)%减小到(23.81±12.40)%(n=9 P＜0.01),脂质过氧化损伤降低了54.57%,RBC膜脆性损伤用溶血率表示,溶血率由(80.76±20.23)%下降到(66.30±7.08)%(n=6 P＜0.001),下降了17.90%.结论单抗HIM82不仅能明显地降低PMN的ROS水平也能有效保护周围红细胞,可能对防治多种趋化因子激活PMN引起的ROS损伤提供一种新的有效途径..     

酪氨酸蛋白激酶受体B在人卵泡中的表达及意义

目的 探讨酪氨酸蛋白激酶受体B(tyrosine kinase receptor B,TrkB)在人卵泡中的表达及意义。方法 用免疫细胞化学方法检测TrkB在超促排卵妇女壁层颗粒细胞、卵丘颗粒细胞、未受精或未成熟卵母细胞中的表达，并用Western免疫印迹方法检测TrkB在壁层颗粒细胞、卵丘颗粒细胞中的表达水平。结果 壁层颗粒细胞、卵丘颗粒细胞、卵母细胞均有TrkB表达。壁层颗粒细胞表达量高于卵丘颗粒细胞。结论 脑源性神经营养因子在人卵巢可能通过与TrkB结合，参与颗粒细胞功能的完成和卵母细胞发育的调控。     

蛋白激酶C和蛋白酪氨酸激酶活性对缺血再灌注心肌细胞凋亡影响的实验研究

为探讨缺血预适应（Ｉｓｃｈｅｍｉｃ Ｐｒｅｃｏｎｄｉｔｉｏｎｉｎｇ,ＩＰ）早期以及蛋白激酶Ｃ（Ｐｒｏｔｅｉｎ Ｋｉｎａｓｅ Ｃ,ＰＫＣ）及蛋白酷氨酸激酶（Ｐｅｏｔｅｉｎ Ｔｙｒｏｓｉｎｅ Ｋｉｎａｓｅ,ＰＴＫ）激动剂和抑制剂对缺血再灌注（Ｉ／Ｒ）心肌细胞凋亡的影响以及ＩＰ效能发挥通路中央ＰＫＣ和ＰＴＫ的关系。用ＴＵＮＥＬ法检测Ｉ／Ｒ心肌细胞凋亡。结果显示：１、ＩＰ早期能显著降低Ｉ／Ｒ心肌细胞凋亡（     

黄芩素对人乳腺癌MCF-7细胞内酪氨酸蛋白激酶的抑制作用

目的观察黄芩素对MCF-7细胞内酪氨酸蛋白激酶(TPK)活性的影响。方法采用台盼蓝拒染法,在不同条件下测定细胞增殖的抑制率。TPK活性通过测定转移到TPK底物上[-32P]ATP的32P放射性活度来检测。结果黄芩素能够显著地抑制MCF-7细胞内TPK的活性并呈剂量依赖性关系,其IC50为2·5μmol/L。结论黄芩素作为一种细胞内的TPK抑制剂具有潜在的抗乳腺癌应用价值。     

Effects of Corticosterone,. cAMP, cGMP, Ca^2＋, and Protein Kinase C on Apoptosis of Mouse Thymocytes Induced by X-ray Irradiation

Objective To observe the effects of signal factors of corticosterone （CS）, cAMP, cGMP, Ca^2＋ and protein kinase C （PKC） on lymphocyte apoptosis in mouse thymus induced by X-rays of 4 Gy in vitro. Methods The DNA lyric rate for thymocytes was measured by fluomspectrophotometry. Results The DNA lyric rate for thymocytes 4-8 hours after irradiation with 2-8 Gy was significantly higher than that in the control （P〈0.01）. As compared with the control, the DNA lyric rate for thymocytes treated with 0.01 μnol/L CS （P〈0.01）, 50 ng/mL cAMP （P〈0.01）, 0.05-0.4 μg/mL ionomycin （Iono, P〈0.05 or P〈0.01） or 0.05-0.4 ng/mL phorbol myristate acetate （PMA, P〈0.05 or P〈0.01）, respectively, was significantly increased, while the rate for thymocytes treated with 50 ng/mL cGMP was not significantly increased. The DNA lyric rate for thymocytes treated with 0.01 μmol/L CS （P〈0.01）, 50 ng/mL cAMP （P〈0.01）, 0.2 and 0.4 μg/mL Iono （P〈0.05）, and 0.2 and 0.4 ng/mL PMA （P〈0.05） plus 4-Gy irradiation, respectively, was significantly higher than that treated with single 4-Gy irradiation, while the rate for thymocytes treated with 50 ng/mL cGMP plus 4-Gy irradiation was not increased. When both 0.4 I.tg/mL Iono and 0.4 ng/mL PMA acted on the thymocytes, the DNA lyric rate for thymocytes was significantly higher than that in the control （P〈0.01）, the DNA lytic rate for thymocytes treated with both 0.4 μg/mL Iono and 0.4 ng/mL PMA plus 4-Gy irradiation was significantly higher than that treated with single 4-Gy irradiation （P〈0.05）, but was Iono plus 4-Gy irradiation or 0.4 ng/mL PMA plus 4-Gy irradiation. can promote thymocyte apoptosis induced by larger dose X-rays. not significantly higher than that treated with 0.4 μg/mL Conclusion CS, cAMP, Ca^2＋, and PKC signal factors can promote thymocyte apoptosis induced by larger dose X-rays.     

The role of protein kinase C and [Ca2+]i in superoxide anion synthesis and myeloperoxidase degranulation of human neutrophils

A chemiluminescence procedure has been developed to determine superoxide anion (O2-) generation and myeloperoxidase (MPO) release from human activated neutrophils. By using this procedure, the role of protein kinase C (PKC) and cytosolic calcium ion (Ca2+[i) for O2- generation and MPO release was examined. Activation of Fc gamma R on neutrophils with IgG-coated zymosan (IgGZ) caused a transient rise of Ca2+[i, followed by O2- generation and MPO release. A PKC inhibitor suppressed completely the O2- generation and slightly the MPO release. Direct activation of PKC by a specific PKC activator, phorbol myristate acetate (PMA), induced a remarkable O2- generation and a small MPO release, indicating that PKC may regulate entirely O2- synthesis and partially MPO degranulation. Influx of extracellular Ca2+ induced by the calcium ionophore A23187 provoked MPO release only. Complete inhibition of this MPO release with a Ca2+/calmodulin (CaM)-coupling inhibitor and a CaM inhibitor provides evidence that Ca2+[i may regulate MPO degranulation through direct activation of CaM, but not PKC. The Ca2+/CaM inhibitors significantly prevented IgGZ-induced O2- generation and MPO release, while they did not affect PMA-induced O2- generation and MPO release. These results suggest that in Fc gamma R-stimulated neutrophils, Ca2+[i activates CaM, which in turn mediates not only activation of PKC-induced O2- synthesis and MPO degranulation, but also MPO degranulation without PKC intermediate.     

腺性膀胱炎组织中MAPK信号传导作用的相关研究

目的:研究腺性膀胱炎病变中促分裂原活化蛋白激酶(MAPK)p42/44和p38的含量水平,探讨其可能的发生机制。方法:应用Westernblot法检测腺性膀胱炎、膀胱普通炎症、膀胱移行细胞癌和正常膀胱组织中p42/44和p38MAPK的含量,并进行比较分析。结果:腺性膀胱炎与膀胱癌组织中p42/44的水平显著高于正常膀胱组织(P<0.01),膀胱普通炎性组织p42/44蛋白水平只轻度增高,但其组织p38水平最高(P<0.01)。膀胱癌组织的p38最低,与腺性膀胱炎比较有显著性差异(P<0.05),与正常膀胱组织比较无差异。结论:腺性膀胱炎的p42/44和p38MAPK信号传导通路不同的激活或抑制可能是细胞增殖、转化和恶性变的重要机制。     

The cAMP-mediated protein kinase signal transduction pathway is involved in the pyrogenic effect of CRH in rats

Objective To determine whether the cyclic adenosine monophosphate (cAMP) mediated protei n kinase signal transduction pathway is involved in the pyrogenic action of cort icotropin releasing hormone (CRH) in rats.Methods Corticotropin releasing hormone, 2’,3’-dideoxy-adenosine (DDA) and adenosi ne-3’,5’-(cyclic) monophosphorothionate, Rp-Isomer (Rp-cAMPS), were administ ered intracerebroventricularly (i.c.v.). The colonic temperature was measure d using a thermistor, and the content of cAMP in the hypothalamus was determined by radioimmunoassay. Hypothalamic incubation was used to assess the effects of CRH on the content of cAMP in the hypothalamus in vitro. Results Microinjection (i.c.v.) of CRH (2.5 μg, 5.0 μg and 10 μg) caused incr eases in colonic temperature and the hypothalamus cAMP level in conscious rats. CRH increased hypothalamus cAMP level in vitro. The pyrogenic effects of CRH w ere abolished or markedly inhibited by prior injection (i.c.v.) of an adenyla te cyclase inhibitor, DDA (30 μg), or an inhibitor of cAMP-dependent protein kinase, Rp-cAMPS (15 μg). Conclusion cAMP mediates the pyrogenic action of centrally administered of CRH in rats, and protein kinase A may play an important role in the central CRH-induced fever. The cAMP-dependent protein kinase signal transduction pathway may be involved in the central mechanisms of the pyrogenic action of CRH in rats.     

MAPK信号转导通路在托瑞米芬非雌激素抗肿瘤中的作用

目的 探讨托瑞米芬(TOR)对乳腺癌细胞株MCF7的非雌激素抗肿瘤作用及促分裂原激活蛋白激酶(MAPK)信号转导通路在其中所发挥的作用.方法 采用SRB法测量TOR单独或联合MEK抑制剂PD98059对乳腺癌细胞株MCF7活性的抑制;Western blotting检测不同浓度TOR对MCF7细胞株磷酸化ERK的影响.结果 TOR抑制乳腺癌细胞株MCF7的活性,抑制强度呈浓度依赖性.PD98059与TOR联用,可显著增强TOR对MCF7细胞株的细胞毒作用,对细胞株抑制率大于两药单独应用之和.5、10、20μmol/L的TOR对MCF7细胞株中磷酸化ERK有明显的浓度依赖性抑制作用.结论 MAPK信号转导通路在TOR非雌激素抗肿瘤中发挥重要作用,MAPK通路抑制剂与TOR联合应用可发挥协同作用,增强其抗肿瘤效用.     

MAPK信号转导通路在托瑞米芬非雌激素抗肿瘤中的作用

目的探讨托瑞米芬(TOR)对乳腺癌细胞株MCF7的非雌激素抗肿瘤作用及促分裂原激活蛋白激酶(MAPK)信号转导通路在其中所发挥的作用。方法采用SRB法测量TOR单独或联合MEK抑制剂PD98059对乳腺癌细胞株MCF7活性的抑制;Western blotting检测不同浓度TOR对MCF7细胞株磷酸化ERK的影响。结果TOR抑制乳腺癌细胞株MCF7的活性,抑制强度呈浓度依赖性。PD98059与TOR联用,可显著增强TOR对MCF7细胞株的细胞毒作用,对细胞株抑制率大于两药单独应用之和。5、10、20μmol/L的TOR对MCF7细胞株中磷酸化ERK有明显的浓度依赖性抑制作用。结论MAPK信号转导通路在TOR非雌激素抗肿瘤中发挥重要作用,MAPK通路抑制剂与TOR联合应用可发挥协同作用,增强其抗肿瘤效用。     

蛋白激酶C在肺缺血预处理保护中的作用

目的:建立大鼠肺缺血/再灌注(I/R)损伤模型,探讨蛋白激酶C(PKC)在肺缺血预处理(IPC)保护中的作用。方法:建立在体单侧肺原位I/R模型。50只SD大鼠随机均分为假手术(S)组、I/R组、IPC组、多黏菌素B(PMB)组和缺血预处理加多粘菌素B(IPC+PMB)组5组。实验结束时测定各组肺组织SOD活力、MDA含量、肺湿干重比和肺泡损伤数比值,观察肺超微结构变化。结果:(1)与S组相比,I/R组SOD活力下降,MDA含量升高,肺湿干重比升高,肺泡损伤数比值升高(均P<0.01);与I/R组比较,IPC组SOD活力升高,MDA含量降低,肺湿干重比降低,肺泡损伤数比值降低(均P<0.01);与I/R组比较,PMB组和IPC+PMB组各项指标差异无统计学意义(均P>0.05)。(2)肺组织病理学改变:I/R组、PMB组和IPC+PMB组肺组织损伤明显,IPC组肺组织损伤较I/R组明显减轻,S组肺组织结构基本正常。结论:IPC对肺I/R损伤有明显的保护作用,而且这一作用可被PKC抑制剂PMB抑制。     

PTD-BDNF对海马神经元钠、钾、钙离子通道的影响

目的研究PTD-BDNF对大鼠海马神经元细胞钠、钾、钙离子通道的影响。方法全细胞膜片钳技术记录海马神经元细胞电压依赖性钠、钾、钙通道电流,观察并分析PTD-BDNF对离子通道电流的影响。结果与对照组比较,PTD-BDNF、BDNF使海马神经元钠通道电流强度峰值分别增加39.35%和41.99%（n=4,P〈0.01）;使钠通道电流-电压关系曲线下移（n=4,P〈0.01）;使海马神经元钙通道电流强度峰值分别增加39.20%和38.72%（n=4,P〈0.01）;使钙通道电流-电压关系曲线下移（n=4,P〈0.01）;使海马神经元钾通道电流IA、IK在20mv刺激处分别比对照组降低29.03%、28.06%和29.76%、33.38%;使钾电流-电压关系曲线下移（n=4,P〈0.01）。PTD-BDNF与BDNF两者之间比较差异均无统计学意义（P〉0.05）。结论PTD-BDNF显示了与脑源性神经营养因子相似的电压依赖性离子通道的调节作用,说明PTD-BDNF与脑源性神经营养因子在调节神经元静息膜电位、神经兴奋性方面有相同的分子基础。