萝卜硫素对内皮素-1诱导大鼠平滑肌细胞增殖的影响

目的 研究萝卜硫素(SFN)对内皮素-1(ET-1)诱导大鼠胸主动脉血管平滑肌细胞(VSMC)增殖的影响及其机制。方法 将组织贴块法原代培养的VSMC随机分为对照组(正常培养)、模型组(给予0.1μmol·L^-1 ET-1处理)和低、中、高剂量实验组(分别给予5、10、20μmol·L^-1 SFN+0.1μmol·L^-1 ET-1处理)。用噻唑蓝法检测细胞增殖活力,用实时荧光定量聚合酶链反应法测定增殖及凋亡相关基因mRNA表达水平,用荧光探针2’,7’-二氯二氢荧光素二乙酸酯法检测活性氧(ROS)相对荧光强度,用蛋白质印迹法测定B淋巴细胞瘤-2(Bcl-2)、半胱氨酸天冬氨酸蛋白酶-3(caspase-3)、p38丝裂原活化蛋白激酶(p38MAPK)、磷酸化p38丝裂原活化蛋白激酶(p-p38MAPK)及p53蛋白的表达水平。结果 对照组、模型组和低、中、高剂量实验组的细胞增殖活力分别为0.27±0.02、0.50±0.04、0.40±0.03、0.38±0.03和0.34±0.03,Bcl-2 mRNA表达水平分别为1...     

Cl~-通道在内皮素-1引起的血管平滑肌细胞增殖中的作用

目的　研究Cl-通道在内皮素 1(endothelin 1,ET 1)引起的血管平滑肌细胞增殖中的作用 ,并探讨其可能的作用机制。方法　通过细胞计数和3H TdR参入实验 ,并结合fura 2 /AM荧光测定胞浆游离Ca2 + 浓度 ([Ca2 + ]i)等技术 ,观察了Cl-通道阻断剂对ET 1引起的 [Ca2 + ]i 变化及血管平滑肌细胞增殖的影响。结果　Cl-通道阻断剂DIDS可呈浓度依赖性地抑制 10nmol·L-1ET 1引起的血管平滑肌细胞增殖 ,其它Cl-通道阻断剂如IAA 94、NPPB、SITS、DPC和速尿均无此作用 ,DIDS也能抑制 10nmol·L-1ET 1引起的内流相 [Ca2 + ]i 升高 ,而对ET 1引起的Ca2 + 释放无影响 ;预先将细胞与 1μmol·L-1nifedipine作用后 ,3μmol·L-1DIDS对 10nmol·L-1ET 1引起的内流相 [Ca2 + ]i 升高及血管平滑肌细胞增殖不再有效 ,将细胞与 10 μmol·L-1SK&F96 36 5预孵后 ,DIDS却能进一步抑制ET 1的上述作用 ;3μmol·L-1DIDS对 30mmol·L-1KCl引起的胞浆[Ca2 + ]i升高无影响。结论　DIDS可通过阻断Cl-通道来抑制ET 1因促发Cl-通道开放经电压依赖性钙通道的Ca2 +内流及细胞增殖 ,DIDS敏感的Cl-通道可能在ET 1促发的Ca2 + 内流及血管平滑肌细胞增殖的调控上都起着重要的作用     

川芎嗪抑制大鼠气道平滑肌细胞增殖的作用

目的探讨川芎嗪对大鼠气道平滑肌细胞(airway smooth muscle cells,ASMCs)增殖的影响。方法采用酶消化法和改良组织块法培养原代大鼠气道平滑肌细胞。MTT法检测血小板源生长因子(platelet-derived growth factor,PDGF)与川芎嗪共同处理的大鼠ASMCsA490的吸光度值,以观察川芎嗪对PDGF诱导的细胞增殖的抑制作用。Western blot检测ERK1/2及p-ERK1/2蛋白表达水平。结果 MTT法检测,与各对照组比较,给予12.5、25、50、100和200μmol.L-1浓度川芎嗪处理6、12、24、36和48h后,各浓度组川芎嗪处理的细胞平均抑制率均增加,P<0.05,其中以200μmol.L-1在48h时效果最明显,P<0.01。川芎嗪(200μmol.L-1)与PDGF(20pg·L-1)共同处理30min和60min后,p-ERK1/2蛋白表达水平均明显降低。结论川芎嗪对增殖的ASMCs有抑制作用,可能与抑制ERK1/2的信号通路活化有关。     

川芎嗪对大鼠心肌线粒体损伤的保护作用

目的 :观察川芎嗪对大鼠缺血再灌注心肌线粒体损伤的影响及其机制。方法 :结扎大鼠冠状动脉30min后灌注20min ,复制缺血再灌注模型。测定心肌线粒体中琥珀酸脱氢酶 (SDH)、细胞色素氧化酶 (CCO)、Ca2 + ·Mg2 + -ATP酶、Ca2 + -ATP酶、超氧化物歧化酶 (SOD)、谷光甘肽过氧化物酶 (GSH -PX)活力及细胞色素和丙二醛 (MDA)含量。结果 :川芎嗪保护组的SDH、CCO、Ca2 + -ATP酶、Ca2 + ·Mg2 + -ATP酶、SOD和GSH -PX活力显著高于缺血再灌注组 (P<0 05) ,其细胞色素aa3、细胞色素C和膜磷脂含量也显著高于缺血再灌注组 ,而MDA含量则显著性降低。结论 :川芎嗪对缺血再灌注时心肌线粒体膜酶活性变化及膜成分降解有较强的拮抗作用 ,其机理可能是通过提高对氧自由基的清除和抑制脂质过氧化。     

高糖增强兔血管平滑肌细胞对内皮素—1的增殖反应性

目的;观察高糖对内皮素－１促兔主动脉血管平滑肌细胞增殖的影响。方法：ＶＳＭＣ分别培养于含正常葡萄糖,高糖或高渗的培养基中,「＾３Ｈ」胸腺嘧啶掺入法检测ＤＮＡ合成速率,蛋白质印迹法检测磷酸化ｐ４４／４２ ＭＡＰＫ的表达。结果：在１０＾－１２至１０＾－８ｍｏｌ．Ｌ＾－１浓度范围内,ＥＴ－１浓度依赖方式增加ＶＳＭＣ的「＾３Ｈ」胸腺嘧啶掺入及磷酸化ｐ４４／ｐ４２ＭＡＰＫ的表达。     

高糖增强兔血管平滑肌细胞对内皮素-1的增殖反应性(英文)

观察高糖对内皮素－１（ＥＴ－１）促兔主动脉血管平滑肌细胞（ＶＳＭＣ）增殖的影响．方法： ＶＳＭＣ分别培养于含正常葡萄糖、高糖或高渗（５．５，２５，葡萄糖 ５．５＋甘露醇 １９．５ ｍｍｏｌ·Ｌ－１）的培养基中［３Ｈ］胸腺嘧啶掺入法检测ＤＮＡ合成速率，蛋白质印迹法检测磷酸化 ｐ４４／４２ ＭＡＰＫ的表达．结果：在 １０至 １０－８ｍｏｌ·Ｌ－１浓度范围内， ＥＴ－１以浓度依赖方式增加 ＶＳＭＣ的［３Ｈ］胸腺嘧啶掺入及磷酸化ｐ４４／４２ ＭＡＰＫ的表达，从 １０－１１到 １０－８ｍｏｌ·Ｌ－１，培养于高糖的 ＶＳＭＣ对相同浓度 ＥＴ－１的增殖反应性高于正常糖或高渗培养条件下的ＶＳＭＣ（Ｐ＜ ０．０５，或 Ｐ＜ ０．０１），而在后两种条件下，ＶＳＭＣ对ＥＴ－１的增殖反应无显著差别．同样，在高糖条件下，ＥＴ－１诱导的ＶＳＭＣ磷酸化ｐ４４／４２ＭＡＰＫ的表达较正常糖和高渗ＶＳＭＣ增加 ６０％－６５％结论：高糖增强ＶＳＭＣ对ＥＴ－１的增殖反应性，可能与磷酸化的 ｐ４４／４２ ＭＡＰＫ高表达有关     

拉马克啉对内皮素-1诱导的大鼠血管平滑肌细胞增殖及蛋白激酶C表达的作用

目的：探讨拉马克啉（levcromakalim）对内皮素-1（ET-1）诱导的大鼠血管平滑肌细胞增殖及蛋白激酶C（protein kinase C，PKC）表达的影响。方法：体外培养Wistar大鼠主动脉血管平滑肌细胞（vascular smooth muscle cell，VSMCs），用ET-1诱导其增殖，用不同浓度拉马克啉共培养，MTT法评价VSMCs增殖情况，3H—TdR检测DNA合成，流式细胞术检测VSMCs凋亡，逆转录聚合酶链式反应（RT-PCR），Western blot检测PKCamRNA及蛋白表达。结果：拉马克啉对ET-1所致VSMCs增殖有显著抑制作用，随浓度增加，其MTT活性细胞含量和3H—TdR掺入量都明显减少（P〈0．05）；拉马克啉呈剂量依赖性地增加G0／G1期VSMCs（P〈0．05），促使VSMCs凋亡增多（P〈0．05）；拉马克啉抑制VSMCs内PKCamRNA及蛋白表达。结论：拉马克啉抑制ET-1诱导的VSMCs增殖作用，可能的机制是通过下调VSMCs内PKCa表达水平而影响vSMCs增殖和凋亡。     

内皮素对大鼠肺动脉平滑肌细胞膜钾通道的影响

目的观察内皮素(ET-1)对大鼠肺动脉平滑肌细胞(PASMCs)膜电压门控钾通道(K_V)的作用。方法用全细胞膜片钳记录方法研究ET-1对膜电位(E_m)、膜电容(C_m)、电压门控钾电流(IK_V)的影响。结果ET-1可引起PASMCs去极化,并抑制IK_V,抑制IK_V时间明显早于其对E_m变化的影响,ET-1对IK_V的影响呈可逆性和浓度依赖性,在有钙的环境中,ET-1对IK_V峰电流的抑制率明显高于无钙时。结论ET-1可浓度依赖性的抑制IK_V,使常氧大鼠PASMCs去极化,且ET-1对IK_V的抑制作用早于对E_m的影响,这些作用不完全依赖于钙的参与,但钙可加强ET-1对IK_V的抑制作用。     

川芎嗪对大鼠心肌缺血再灌注损伤保护作用的研究

目的观察川芎嗪对心肌缺血再灌注损伤的保护作用及机理。方法采用大鼠冠脉结扎30min后再通20min造成心肌缺血再灌模型。大鼠随机分对照组、缺血组、模型组(缺血再灌组)和川芎嗪保护组。观测心肌细胞膜和线粒体中过氧化物歧化酶(SOD)、还原型谷胱甘肽(GSH·PX)、Ca2 _ATP酶和K ,Na _ATP酶活力 ,MDA及心肌钙含量。结果川芎嗪保护组心肌细胞膜SOD、GSH·PX、Ca2 _ATP酶和Na ,K _ATP酶活性较缺血再灌组均有显著性升高(P<0.05或P<0.01) ,丙二醛(MDA)和心肌钙含量却呈显著性降低。线粒体中SOD和GSH·PX活力也呈显著性升高(P<0.05),MDA却为显著性降低。结论川芎嗪对大鼠缺血再灌注损伤心肌有确切保护作用 ,其机理是通过提高对氧自由基的清除及抑制脂质过氧化。     

胰岛素-反义c-myb-硫代磷酸寡脱氧核苷酸对大鼠主动脉平滑肌细胞增殖的抑制作用

目的研究新制剂胰岛素 反义c myb 硫代磷酸寡脱氧核苷酸 (PS ODN)对平滑肌细胞增殖的抑制作用。方法大鼠主动脉平滑肌细胞 (SMC)置DMEM中培养。用 2 0 %胎牛血清刺激SMC快速增殖。胰岛素与反义c myb PS ODN在一定条件下 ,如反应液、pH、温度、离子浓度 ,共孵育形成交联物。通过高效液相色谱定性和纯化该交联物。用3H TdR掺入率反映SMC增殖抑制效率。结果在加 2 0 %FBS的DMEM中生长的SMC胰岛素结合力明显增强。交联物胰岛素 反义c myb PS ODN对SMC增殖的抑制作用比单纯反义c myb PS ODN的抑制作用强 ,抑制效率分别为 4 8.3 %和 2 9.5 %。结论胰岛素受体靶向途径可能为一种治疗再狭窄的有效方法。     

Characteristics of the relaxant response of adenosine and its analogs in intestinal smooth muscle

Several characteristics of the relaxant response of the isolated longitudinal muscle of the rabbit small intestine in response to the administration of adenosine and related compounds are studied. Following administration of adenosine or ATP the preparation responded with a rapid initial suppression of spontaneous contractile activity followed by a secondary sustained phase of inhibition of lower magnitude. Cumulative application of relaxant doses of adenosine or ATP caused a lesser total response than that obtained by single application of the cumulative dose. Neither procaine, lidocaine or guanethidine antagonized the responses to adenosine or ATP and the responsiveness of muscles obtained from reserpinized animals appeared unchanged. A number of adenosine derivatives and analogs was tested for the ability to relax the muscle. Generally, compounds containing a primary or secondary 6-amino group acted as agonists with the exception of 8-bromoadenosine. Those nucleosides found to be inactive did not modify the responsiveness of the muscle to adenosine. Responses to adenosine and ATP were not appreciably modified by papaverine, imidazole, dipyridamole, 6-(p-nitrobenzylthio)-purine riboside. Antagonism was observed, however, with phentolamine and theophylline. Theophylline at 100 μM inhibited responses to adenosine over a wide dose range; this antagonism was surmountable by high doses of adenosine. 1-Methyl-3-isobutylxanthine did not antagonize adenosine responses. A number of 1,3-alkyl-6-thioxanthines did not modify the adenosine response at doses that did not show any direct action. The results support the concept of an extracellular receptor site of adenosine and its analogs and the absence of an indirect mechanism of action via nerve stimulation.     

Functional role of endothelin ETA and ETB receptors in venous and arterial smooth muscle

The functional importance of endothelin ET_A and ET_B receptors in selected arterial and venous smooth muscle preparations was characterized. Endothelin-1 induced force in the saphenous and jugular veins is normally mediated by endothelin ET_B-like receptors. However, desensitization or pharmacological block of these receptors reveals an endothelin ET_A receptor population that is of sufficient size to mediate full endothelin-1-evoked force. Block of either endothelin ET_A or endothelin ET_B receptors alone is insufficient to antagonize endothelin-1-evoked force in saphenous vein. Endothelin-1-induced force in hamster aorta may also be mediated by activation of both endothelin ET_A and ET_B receptors. However, activation of endothelin ET_B-like receptors alone is insufficient to generate a full endothelin-1 response. Sarafotoxin S6c treatment, to desensitize endothelin ET_B receptors, failed to affect the responses of rat aorta and rabbit carotid artery to endothelin-1 or endothelin ET_A receptor antagonists. These findings indicate that selective endothelin receptor antagonists will vary enormously in their efficacy against endothelin-induced force in different vascular beds.     

Endothelin-1 induces contraction via a Syk-mediated p38 mitogen-activated protein kinase pathway in rat aortic smooth muscle

Although spleen tyrosine kinase (Syk) has crucial roles in various cells, its function on vascular smooth muscle contraction has not been determined. In the present study, we performed experiments to determine if Syk contributes to the endothelin-1 (ET-1)-mediated contraction in rat aortic smooth muscle. ET-1-induced contraction of aortic strips was inhibited by piceatannol, PD98059, and SB203580, inhibitors of Syk, extracellular signal-regulated kinase 1/2 (ERK1/2), and p38 mitogen-activated protein kinase (MAPK), respectively. Piceatannol also attenuated high K(+)-induced contraction. ET-1 dose-dependently enhanced the activity of Syk and this was inhibited by piceatannol in both rat aortic strip and rat aortic smooth muscle cells. The phosphorylation of p38 MAPK and heat shock protein 27 (HSP27), but not that of ERK1/2, in response to ET-1 was inhibited by both piceatannol and SB203580. These results suggest that Syk may play an important role in the regulation of aortic smooth muscle contraction induced by ET-1, which may be mediated by the p38 MAPK/HSP27 signaling pathway.     

同型半胱氨酸诱导人血管平滑肌细胞氧化损伤的研究

目的探讨同型半胱氨酸（Hcy）对人脐静脉血管平滑肌细胞（VSMCs）氧化损伤的作用及机制。方法用含不同剂量Hcy（50～1000μmol/L）的培养基培养VSMCs24h后,以分光光度比色法分别测定细胞内丙二醛（MDA）含量和超氧化物酶（SOD）、过氧化氢酶（CAT）活力的改变。结果随Hcy浓度增加,VSMCs内MDA的含量明显增加,SOD和CAT的活力也显著升高。Hcy明显促进了VSMCs的氧化。结论Hcy可直接诱导VSMCs的氧化损伤。     

Studies on the effects of piperidine derivatives on blood pressure and smooth muscles contractions

Ten substituted phenacyl derivatives of 4-hydroxypiperidine were synthesized and studied for their effects on the mean arterial blood pressure (MABP) in normotensive anaesthetized rats and smooth muscles contractions of isolated rabbit jejunum. Two derivatives caused fall in blood pressure at the dose of 10≈20 mg/kg and one rise in blood pressure at the dose of 20 mg/kg. Two compounds exhibited biphasic response (hypotensive followed by hypertensive) and one gave triphasic response at 10 mg/kg dose. Rest of four derivatives were found devoid of any effect on mean arterial blood pressure up to the dose of 30 mg/kg. All the derivatives except two caused relaxant effect on the spontaneous contraction of rabbit jejunum at the dose range of 0.1≈2 mg/kg.     

大鼠腹主动脉平滑肌细胞培养及鉴定

目的 培养、鉴定大鼠腹主动脉平滑肌细胞.方法 采用组织贴块法分离培养大鼠腹主动脉平滑肌细胞,胰蛋白酶消化传代,相差显微镜及即用型SABC免疫组化染色试剂盒进行细胞鉴定.结果 平滑肌细胞呈梭形或长梭形生长,透射电镜可见细胞的胞浆内有很多与细胞纵轴平行的肌丝和与之相连的致密体.高倍镜下可见胞质内大量棕色、与细胞长轴平行的纤...     

吸入性糖皮质激素对哮喘气道重塑模型平滑肌的影响

目的探讨吸入性糖皮质激素对哮喘气道重塑模型平滑肌的影响。方法雄性豚鼠108只,随机分为哮喘发作组(A组)、治疗组(B组)和对照组(C组)。每组动物分别予以卵蛋白(OVA)、布地奈德或生理盐水处理,在每个时点末次激发后24 h处死,留取肺组织,测量气道平滑肌的厚度。结果在12周时各组气道平滑肌层厚度,A组(26.56±3.39)μm,B组(18.29±4.11)μm,C组(9.85±3.59)μm,两两比较均有显著性差异(P<0.05)。在首次激发后24 h各组气道平滑肌层厚度分别为(7.66±1.86)μm、(7.81±1.61)μm和(7.79±1.55)μm,两两比较均无显著性差异(P>0.05),直到激发8周后各组平滑肌层厚度才出现显著性差异(P<0.05)。结论吸入性糖皮质激素能抑制气道平滑肌层增厚,但这种作用是不完全的。     

Relaxation effects of matrine on guinea-pig aortic smooth muscles

Objective The present in vivo study was undertaken to determine whether matrine,a kind of traditional Chinese medicinal alkaloid,would relax the isolated guinea pig aortic smooth muscles,if so,to investigate the mechanism involved.Methods The concentration-dependent relaxation response to matrine was studied in phenylephrine or potassium chloride precontracted guinea pig aortic rings.Results Matrine(1×10-4 M-3.3×10-3 M)relaxed the endothelium denuded aortic rings precontracted submaximally with phenylephrine,in a concentration-dependent manner,and it's preincubation(3.3×10-3 M)produced a significant rightward shift in the phenylephrine dose-response curve,but had no effects on the potassium chloride-induced contraction.The anticontractile effect of matrine was not reduced by the highly selective ATP-dependent K+ channel blocker glibenclamide(10-5 M),the non-selective K+ channel blocker tetraethylammonium(10-3 M),as well as the β-antagonist propranolol(10-5 M).In either "normal" or "Ca2+-free" bathing medium,the phenylephrine-induced contraction was attenuated by matrine(3.3×10-3 M),indicating the vasorelaxation was due to inhibit of intracellular and extracellular Ca2+ mobilization.Conclusions The results obtained clearly demonstrated that matrine inhibits phenylephrine-induced contractions by inhibiting activation of α-adrenoceptor and interfering with both the release of intracellular Ca2+ and the influx of extracellular Ca2+.     

Endothelin-1-induced translocation of RhoA is mediated by endothelin ET(A) receptors in rat bronchial smooth muscle

To clarify the receptor subtype(s) contributing to the RhoA activation by endothelin-1 in bronchial smooth muscle, the effects of BQ-123 [cycro(D-Asp-Pro-D-Val-Leu-D-Trp)], an endothelin ET(A) receptor antagonist, and/or BQ-788 [2,6-dimethylpiperidinecarbonyl-g-methyl-Leu-Nin-(Methoxycarbonyl)-D-Trp-D-Nle], an endothelin ET(B) receptor antagonist, on the endothelin-1-induced translocation of RhoA to plasma membrane were examined. Incubation of rat bronchial smooth muscle with endothelin-1 induced a distinct translocation of RhoA to plasma membrane, indicating an activation of RhoA by endothelin-1. The endothelin-1-induced translocation of RhoA was completely blocked by treatment with BQ-123, whereas BQ-788 had no effect. Thus, endothelin ET(A) but not ET(B) receptors might be involved in the endothelin-1-induced translocation of RhoA in rat bronchial smooth muscle.