Mitomycin C对小鼠腹水肝癌细胞膜脂的作用

本实验用1,6-二苯基-1,3,5-已三烯(DPH)作荧光探剂,应用荧光偏振技术研究Mitomycin C(MC)对小鼠腹水肝癌细胞膜脂的作用。结果表明,MC使细胞膜脂区流动性降低,呈明显的量效关系。薄层液相色谱分析,MC改变了膜脂的Rt值。但MC不改变膜的相变温度。     

糖尿病小鼠淋巴细胞膜脂区流动性和细胞增生反应的变化

淋巴细胞膜脂区流动性是细胞膜的一种动力学性质,它与细胞的多种功能有关。近年来已用细胞膜流动性的变化来探讨疾病病因机理。糖尿病患者淋巴细胞的免疫功能较正常人低,我们认为这与淋巴细胞膜性质有关。本文用荧光探剂1,6-二苯基-1,3,5-已三烯(DPH)嵌入小鼠完整淋巴细胞膜双脂层中,用荧光偏振法测定正常小鼠和阿脲致糖尿病小鼠的淋巴细胞膜脂区流动性;同时用~3H-dT     

高低转移性人肺腺癌细胞膜脂区流动性的测定及比较

本文应用荧光探剂DPH(1,6-dipheny1-1,3,5-hexatriene)及荧光偏振技术,对高转移性的人肺腺癌细胞系Anip-973及其低转移性的母系AGiY-83a,经S相(S-phase)同步后细胞膜的流动性进行了测定并作了对比分析。结果表明,高转移性的人肺腺癌细胞膜比其低转移性的母系细胞膜具有较大流动性。     

糖尿病小鼠淋巴细胞膜脂区流动性的变化

用1,6-二苯基-1,3,5-己三烯(DPH)作荧光探剂嵌入正常小鼠和糖尿病小鼠完整淋巴细胞膜脂区,用荧光偏振法测定膜脂区流动性。结果表明糖尿病小鼠淋巴细胞膜的微粘度(η)明显高于正常小鼠。将糖尿病小鼠淋巴细胞置于正常小鼠血清中,37℃温育30min后,其膜的η可回复至正常小鼠水平。提示糖尿病小鼠淋巴细胞膜的η与细胞膜胆固醇含量有关。     

小檗碱对兔红细胞膜流动性及膜蛋白荧光的影响

目的：研究小檗碱对细胞膜流动性及其膜蛋白荧光的影响．方法：以制备的兔红细胞膜为材料,1,6-diphenyl-1,3,5-hexatriene（DPH）为荧光探针,运用荧光偏振技术检测与小檗碱作用后兔红细胞膜流动性的变化,观察小檗碱与兔血红细胞膜蛋白作用后Tyr残基荧光强度的变化．结果：兔血红细胞膜与小檗碱作用后其荧光偏振P值发生了剂量依赖性的下降;小檗碱使兔血红细胞膜蛋白Tyr残基的荧光产生剂量依赖性的淬灭作用．结论：小檗碱在体外能有效提高细胞膜的流动性,可能与小檗碱多种心血管药理活性有关;小檗碱与膜蛋白的作用可能是膜流动性变化的引发机制．     

青龙衣提取物对荷瘤小鼠细胞膜流动性的影响

目的　探讨青龙衣提取物对 S1 80 和 H2 2 荷瘤小鼠细胞膜脂流动性的影响。方法　选取 S1 80 和 H2 2 作为瘤株 ,于正常小鼠腋下接种 S1 80 瘤液 ,腹腔接种 H2 2 瘤液 ,荷瘤小鼠分别每天 ip青龙衣冷醇提取物 (191.37、95 .6 8、4 7.84mg/kg)、热醇提取物 (12 1.17、6 0 .5 8、30 .2 9mg/kg)、环磷酰胺 (2 0 mg/kg,为阳性对照 )、生理盐水 (阴性对照 ) ,给药 7d后处死小鼠 ,制备肿瘤细胞和红细胞悬液。以 1,6 - diphenyl- 1,3,5 - hexatriene (DPH)为探针剂 ,用荧光偏振法测定荧光偏振度 (P)值和微黏度 (η) ,观察青龙衣提取物对细胞膜脂流动性的影响。结果　青龙衣冷醇、热醇提取物均能使 S1 80 小鼠的肿瘤细胞膜流动性提高 ,使 H2 2 小鼠的肿瘤细胞膜流动性降低 ,与生理盐水组比较 ,两种提取物均能降低 H2 2 小鼠红细胞膜流动性 (P<0 .0 5 )。结论　青龙衣提取物可能通过对肿瘤细胞膜的影响起到抑瘤作用 ,而对维持红细胞膜的稳定性起积极作用。     

Ca~(2+)、Mg~(2+)对完整红细胞膜脂区流动性的影响

以1,6.-二苯基-1,3,5-已三烯(DPH)为荧光探剂,用荧光偏振法测定了Ca~(2+)、Mg~(2+)对完整红细胞膜脂区流动性的影响。Ca~(2+)能降低红细胞膜的流动性,而Mg~(2+)则无显著影响,细胞膜流动性的大小与膜上结合的Ca~(2+)量有关,而细胞所处的介质中Ca~(2+)浓度可影响膜上Ca~(2+)结合量。胰岛素对膜的流动性影响可能与膜上结合Ca~(2+)和Mg~(2+)相对量有关。     

Mepyramine对肝脏疾病肝微粒体膜流动性的影响

目的:探讨Mepyramine对肝脏疾病肝微粒体膜流动性的影响.方法:以1,6-diphenyl-1,3,5-hexatriene(DPH)作为荧光探剂,应用荧光偏振技术研究大鼠急性肝炎、大鼠肝硬化肝微粒体膜流动性(LMMF)的变化,并在体外实验观察mepyramine(MPR)对LMMF的影响.结果:①LMMF在大鼠发生急性肝炎时升高,与对照组相比有显著性差异(P＜0.o1),而大鼠发生肝硬化时降低,与对照组相比有显著性差异(P＜0.05).②10-4mol/L MPR可使正常大鼠、大鼠肝硬化及人体肝癌组织LMMF升高(P分别小于0.01,0.01,0.05).结论:肝病时LMMF出现异常;MPR可以升高LMMF,其机制可能与阻断抗组胺药敏感性细胞色素P450(HP-450)有关.     

红细胞膜流动性与原发性高血压关系的探讨

本文应用1,6-二苯基1,3,5-己三烯(DPH)菎作为荧光探针和渗透溶血速率研究红细胞膜的流动性。结果表明,原发性高血压患者红细胞膜荧光偏振度、微粘度和菎Im/Ie比值均比对照组升高,溶血速率降低。而有或无高血压家族史的正常血压子女均末见差异。认为患者的细胞功能异常可能是原发性高血压的一个特征。     

补肾复方对11例肾虚证老年人单核细胞增殖反应及其细胞膜流动性的影响

目的:探讨中药补肾复方对老年人外周血单核细胞(PBMC)增殖反应及膜流动性的影响.方法:选择老年人肾虚证患者给予补肾复方、治疗前后运用MTT比色法检测PBMC对植物血凝素(PHA)刺激的增殖反应,同时运用荧光偏振技术以DPH(1,6-二苯基,1,3,5-己三烯)为荧光探剂检测PBMC膜流动性.结果:补肾复方可以改善老年人肾虚证症状,并能提高其降低的增殖反应和膜流动性(P<0.05).结论:补肾复方增强老年人肾虚证患者细胞免疫功能,可能与提高PBMC膜流动性有关.     

Normal and leukeymic lmphocyte membrane fluidity and response to stimulation with ConA and PHA

In our experiment, lymphocyte membrane was 1abeled by DPH fluorescence probe. The rate of rotation of the probe can be measured from the value of fluorescence polarization (P_DPH). With this method useful information could be provided about membrane fluidity of lymphocytes. It was found that the F value (unit of lipid fluidity of membrane) of leukemic lymphocytes was obviously higher than that of normal ones. Furthermore, the F value of cultured leukemic T_s lymphocytes was the highest. In contrast with normal spleen T-lymphocytes or mixed lymphocytes, the response of malignant lymphocytes to the stimulation with ConA or PHA was reflected in the decrease of P_DPH value or the increase of F value. Unexpectedly, the F value of T-lymphocytes from “615” mouse not injected with tumour cells was also higher than that of the mixed. The possibility of using the membrane fluidity as a diagnostic criterion was also discussed.     

中药热毒清对淋巴细胞膜流动性和DNA合成的影响

本文观察了中药热毒清对小鼠脾脏淋巴细胞膜流动性及淋巴细胞DNA合成的影响,并与伴刀豆球蛋白(ConA)和植物血凝素(PHA)的作用进行比较。结果表明:热毒清使脾混合淋巴细胞或T淋巴细胞膜的流动性升高,并能拮抗ConA或PHA诱导的使膜流动性降低的效应。体外,热毒清抑制ConA转化小鼠淋巴细胞的能力,随浓度加大而增强。上述生物效应,在整体实验中并不明显。     

L7811白血病细胞线粒体膜流动性的测定

本文用DPH荧光探剂标记线粒体膜和荧光偏振技术,对正常615小鼠胸腺淋巴细胞和脾细胞的线粒体膜及其L_(7811)白血病鼠腹水细胞和脾细胞的线粒体膜流动性进行测定。结果表明,L_(7811)白血病鼠腹水细胞及其脾细胞的线粒体膜的荧光偏振度比正常小鼠明显降低,微粘度降低,而流动性增大。     

小儿肾病综合征红细胞膜流动性的观察

以１，６－二苯基－１，３，５－己三烯为荧光探剂，用荧光偏振法测定了２０例肾病综合征（ＮＳ）患儿的红细胞膜流动性，２０名健康儿童为正常对照组。结果表明ＮＳ患儿红细胞膜流动性明显低于正常对照组。患儿红细胞膜由高血脂的血浆中获得了较多的胆固醇是其流动性降低的原因。提示红细胞膜流动性降低造成红细胞流变学异常，可能在ＮＳ血栓形成中起一定的作用。     

Effect of “Re Du Qing” on the activation,proliferation and membrane fluidity of lymphocytes

Summary Effects of Chinese Medicinal Preparation “Re Du Qing” (RDQ) on the activation, proliferation and membrane fluidity of T lymphocytes from human peripheral blood Were studied by means of³H-TdR incorporation and DPH fluorescence polarization. The results showed that “RDQ” can:1) significantly inhibit the activation of T lymphocytes; 2) restrain the proliferation of activated T lymphoblasts in the presence of exogenous interleukin-2 (IL-2); and 3) increase the membrane fluidity of T lymphocytes and antagonize the decreased fluidity of lymphocyte membrane mediated by Con A or PHA. The functional abnormalities of T lymphocytes in some autoimmune diseases such as arthritis and the usefulness of RDQ in the treatment of these diseases were also discussed.     

缺氧缺糖及自由基对心肌细胞膜流动性的影响

应用荧光探剂标记完整心肌细胞膜脂区,用稳态荧光偏振技术观测模拟缺血及电解产生自由基对培养大鼠乳鼠心肌细胞膜流动性的影响。同时还观察了丙二醛和乳酸脱氢酶的变化。结果表明,缺氧缺糖及电解产生自由基在造成心肌细胞损害的同时使膜流动性下降。     

Adjustable action of pi-shen recipe on immune function in mice with L1210 ascites

Proliferation of Con A stimulated splenic lymphocyte was examined by incorporation of 3H-thymidine. Fluorescence polarization of DPH labelled splenic lymphocyte and bone marrow cells was measured. Proliferation of Con A stimulated splenic lymphocyte in DBA inbred healthy mice was higher than that of L1210 mice but fluorescence polarization of DPH labelled splenic lymphocyte in same healthy mice was lower than that of L1210 mice. i.e. membranous lipid lymphocyte fluidity of lymphocyte in the healthy mice was smaller than that of L1210 mice. 9 days after administration of Pi-Shen recipe by tube stomach proliferation of Con A-lymphocyte in the healthy mice has been increased. The recipe adjusted splenic lymphocyte membrane lipid fluidity of L1210 mice to level of those in healthy mice. Effects of Pi-Shen recipe on lipid fluidity of bone marrow cell membrane of L1210 mice were almost similar to that in splenic lymphocytes. These studies suggest that the mechanism on adjustable role of Pi-Shen recipe on T-lymphocyte function related to lymphocyte membrane lipid fluidity.     

Study on Biologic Activity for Membrane of Normal Bone Marrow Cells with Infection of Epidemic Hemorrhagic Fever Virus

Membranelipidfluidity(MLF)hascorrelationtothemultiplicationandma1ignantdegreeofce11s,whichplaysanimPOrtantroleinthepathOgenesisoftheneoplasiacellsescapingfromthegrowthcontrol.Atpresent,noreportonthebio1ogicchangesinMLFofnormalbonemarrowcellswithinfectionofEHFV.ThepurposeofthisstudywastostudythechangesinMLFofnormalbonemarrowce11sanditsrelationtotheinfectionofEHFV.1MATERIALSANDMETHODS1'lCeIlcultureThepuncturewasmadeontheanteriorsuperioriliacspineorposteriorsuperioriliacspineof27c…     

枸杞多糖对细胞膜流动性及蛋白激酶C的体外效应

目的：研究枸杞多糖（LBP）体外免疫调节效应的作用机制。方法：以DPH作为荧光深剂，采用荧光偏振法观察LBP对免红细胞膜流动性的影响。并以32P-组蛋白内参入的放射性强度检测法，观察LBP对淋巴细胞胞膜和胞浆蛋白激酶C（PKC）活性的影响。结果：100mg／LLBP可明显促进兔红细胞细胞膜的流动性，并能增强10mg／L和25mg／LConA对膜流动性的促进作用。同时100ms／LLBP尚可增加ConA活化后的小鼠脾淋但细胞膜上的PKC的活性，但对胞浆PKC的活性无影响。结论：LBP的体外作用途径可能是作用于细胞膜，通过促进细胞膜的流动性及促进ConA活化的小鼠脾淋巴细胞胞浆内PKC从胞浆到胞膜的激活移位而发挥免疫调节效应的。