神经生长因子对小鼠神经胶质细胞代谢及功能的影响

目的：探讨神经生长因子(NGF)对正常小鼠及非肥胖性糖尿病(NOD)小鼠神经胶质细胞代谢及功能的影响。 方法：实验设正常小鼠和NOD小鼠二组,每组10只,提取每只鼠神经胶质细胞后正常小鼠和NOD小鼠各分别分为5组,对照组（加RPMI-1640培养液）和4个实验组（每组10孔）,实验组分别加入含5、10和20 μg·L^-1NGF及20 μg·L^-1　LPS +10 μg·L^-1NGF的培养液,分组培养。用黄嘌呤氧化酶、TBA法检测细胞培养液中SOD活性及MDA含量。 结果：与正常小鼠对照组比较,NOD小鼠对照组SOD活性、MDA含量明显降低（P<0.01）;与NOD小鼠对照组比较,NOD小鼠各实验组神经胶质细胞SOD活性明显升高（P<0.05）,MDA含量显著降低（P<0.05）。 结论：NGF对促进NOD小鼠细胞代谢和改善细胞功能有一定作用。     

Polymeric micelles of zinc protoporphyrin for tumor targeted delivery based on EPR effect and singlet oxygen generation

Polymeric micelles of zinc protoporphyrin (ZnPP) with water soluble biocompatible and amphiphilic polymer, polyethylene glycol (PEG) demonstrated unique characteristics to target tumor tissues selectively based on the enhanced permeability and retention (EPR) effect. The micellar macromolecular drug of ZnPP (SMA–ZnPP and PEG–ZnPP) previously showed notable anticancer activity as a consequence of selective tumor targeting ability and its potent HO-1 inhibitory potential, resulting in suppressed biliverdin/bilirubin production in tumors thereby leading to oxystress induced tumor cell killing. Furthermore, recent findings also showed that ZnPP efficiently generated reactive singlet oxygen under illumination of visible light, laser, or xenon light source, which could augment its oxystress induced cell killing abilities. In the present paper, we report the synergistic effects of light induced photosensitizing capabilities and HO-1 inhibitory potentials of these unique micelles when tested in vitro and in vivo on tumor models under localized, mild illumination conditions using a tungsten–xenon light source. The results indicate that these water soluble polymeric micelles of ZnPP portend to be promising candidates for targeted chemotherapy as well as photodynamic therapy against superficial tumors as well as solid tumors located at light penetrable depths.     

依达拉奉联合高压氧对CO中毒迟发性脑病小鼠血清MDA水平、SOD活性及海马神经元凋亡的影响

目的观察依达拉奉联合高压氧对急性一氧化碳中毒迟发性脑病小鼠血清丙二醛(MDA)水平、超氧化物歧化酶(SOD)活性及海马CA1区神经元凋亡的影响。方法将72只小鼠随机分为对照组、迟发性脑病(DEACMP)组、生理盐水组、高压氧(HBO)组、依达拉奉组及联合治疗组。使用腹腔注射一氧化碳的方法制备一氧化碳中毒迟发性脑病的模型。染毒后15～28 d生理盐水组腹腔注射生理盐水,HBO组行HBO治疗,依达拉奉组腹腔注射依达拉奉,联合治疗组行HBO加腹腔注射依达拉奉治疗。治疗结束后每组分别检测血清MDA水平、SOD活性及海马CA1区神经元凋亡情况。结果①血清MDA、SOD测定结果:DEACMP组小鼠血清MDA含量高于对照组,SOD活性低于对照组(P<0.05);与DEACMP组相比,除生理盐水组外,余治疗组血清MDA含量降低,SOD活性升高,差异有统计学意义(P<0.05);HBO组及依达拉奉组MDA含量高于联合治疗组,而SOD活性均低于联合治疗组,差异有统计学意义(P<0.05);②海马CA1区神经元凋亡:对照组海马CA1区偶见少量凋亡细胞,除生理盐水组外的各治疗组凋亡指数均低于DEACMP组(P<0.05);HBO组及依达拉奉组凋亡指数高于联合治疗组(P<0.05)。结论依达拉奉与HBO联合治疗可以有效降低急性一氧化碳中毒迟发性脑病小鼠血清MDA水平、提高SOD活性,并可以显著抑制海马CA1区神经元凋亡发生,效果优于单纯HBO或者依达拉奉治疗。     

黑木耳粉对矽肺大鼠体内抗氧化水平的影响

目的:探讨黑木耳粉对染矽尘大鼠体内抗氧化物酶活性和脂质过氧化水平的影响。方法:将40只Wister大鼠随机分为阴性对照组、二氧化硅(SiO2)对照组、黑木耳粉高、中和低剂量组,每组8只。采用非暴露式气管插管方法给实验组大鼠染SiO2粉尘,阴性对照组大鼠给予生理盐水,24 h后黑木耳粉干预各剂量组给予黑木耳粉饲料喂养。于染尘后28 d处死大鼠,测定肺组织超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)含量,测定肺泡灌洗液(BALF)中乳酸脱氢酶(LDH)活性,采用HE染色观察肺组织的病理变化。结果:28 d时,与SiO2对照组相比,黑木耳粉各剂量组SOD活性升高,差异有统计学意义;黑木耳粉高剂量组GSH-Px活性较SiO2对照组升高,差异也具有统计学意义;黑木耳粉高、中剂量组MDA的含量及LDH活性与SiO2对照组相比降低,差异均具有统计学意义;病理形态学观察显示,黑木耳粉各剂量组大鼠肺脏损伤程度较SiO2对照组有所减轻。结论:黑木耳粉具有提高矽肺大鼠体内抗氧化水平的作用,在一定程度上能够延缓或阻抑矽肺病变的发展。     

年龄相关性听力减退大鼠听皮层、蜗核、耳蜗组织中SOD、MDA的变化

目的探讨年龄相关性听力减退大鼠听觉系统抗氧化能力随月龄增长的变化。方法采用硫代巴比妥酸(Thibabituric Acid,TBA)法、黄嘌呤氧化酶法测定3月龄和18月龄大鼠听皮层、蜗核及耳蜗组织中的丙二醛(MDA)、超氧化物歧化酶(SOD)。结果18月龄大鼠听皮层、蜗核及耳蜗组织中的SOD活性较3月龄大鼠显著降低,MDA含量显著升高,两组比较差异有显著性(P<0.01)。结论年龄相关性听力减退与听觉系统抗氧化能力下降密切相关。     

改性淀粉/PVA生物降解材料性能的研究

以BPO为引发剂、正庚烷为溶剂在66℃下制得马来酸酐接枝淀粉。将其与聚乙烯醇(PVA)、增塑剂及加工助剂等于HAAKE密炼机中共混，制备了可生物降解热塑性淀粉塑料。研究了接枝改性淀：粉／PVA共混物的力学性能、生物降解性能及热性能等，并用SEM研究了共混物的微观形态。结果表明接枝改性淀粉／PVA共混物拉伸强度为27．57Mpa，60d失重率达65．1％。     

Evaluation of final irrigation regimens with maleic acid for smear layer removal and wettability of root canal sealer

Objective: To evaluate the smear layer removal and wettability of AH Plus sealer on root canal dentin treated with MA (maleic acid), MA?+?CTR (cetrimide) and MA?+?CTR?+?CHX (chlorhexidine) as final irrigating regimens.

Material and methods: For smear layer removal, 40 teeth were instrumented to size F4 and divided into four groups: (1) 7% MA, (2) 7% MA?+?0.2% CTR, (3) 7% MA?+?0.2% CTR?+?2% CHX, (4) distilled water (control). After irrigation, teeth were subjected to SEM analysis. For contact angle analysis, 20 teeth were split longitudinally and divided into four groups similar to smear layer analysis. AH plus sealer was placed on each specimen and contact angle was analysed.

Results: In both smear layer (p?=?.393) and contact angle analysis (p?=?.961), there was no significant difference between the groups MA and MA?+?CTR. However, MA?+?CTR?+?CHX removed smear layer less effectively (p?=?.023) and increased the contact angle of the sealer (p?=?.005). In smear layer analysis, specimens in negative control group were heavily smeared. In case of contact angle analysis, samples in the control group had least contact angle.

Conclusion: MA alone or in combination with CTR removed smear layer effectively and increased the wettability of AH plus sealer to root canal dentin.     

马来酸酐接枝液体异戊橡胶接枝率的测试方法

在锂系液体橡胶(LIR)聚合反应后期加入马来酸酐(MAH)进行接枝反应,制备了马来酸酐接枝液体异戊橡胶(LIR-g-MAH)。采用化学滴定法对比研究了LIR-g-MAH接枝率的测试方法。结果表明,直接滴定法准确度高、重复性好,且当样品用量为1.0~2.0 g,水解试剂为乙醇,滴定碱标准溶液浓度为0.08~0.12 mol/L时,测试条件最优。     

双蒲散对大鼠慢性胃溃疡愈合质量及抗复发的影响

[目的]研究双蒲散对实验性大鼠慢性胃溃疡（GU）愈合质量及抗复发的影响，并探讨其可能机制。[方法]采用乙酸注射至大鼠浆膜下形成慢性GU模型，随机分为模型组、雷尼替丁组、双蒲散组，分别灌服0．85％氯化钠、雷尼替丁及双蒲散。[结果]双蒲散组溃疡指数（UI）、扩张腺体数和炎细胞数目明显低于模型组和雷尼替丁组，再生黏膜厚度、胃黏膜超氧化物歧化酶（SOD）及前列腺素E2（PGE2）水平显著高于模型组和雷尼替丁组，丙二醛（MDA）水平明显低于模型组和雷尼替丁组（均P〈0．01，〈0．05）。[结论]双蒲散可提高GU愈合质量，减少溃疡复发。其机制可能是通过增加胃黏膜组织PGE2和SOD水平，降低MDA水平，促进黏膜修复而实现的。     

基于甲基乙烯基醚／马来酸酐共聚物水凝胶三维培养卵巢癌细胞的研究

目的：验证卵巢癌SKOV-3细胞在自制甲基乙烯基杉马来酸酐共聚物水凝胶中培养形成的3D模型。方法：通过SKOV-3细胞生长曲线、迁移和侵袭能力、耐药实验等,对比自制的水凝胶培养基与市售BME胶和胶原蛋白胶I胶培养基对SKOV-3细胞若干特性的影响。结果：SKOV-3细胞在自制水凝胶TZ028和TZ029培养基第10—15天时,为3D细胞培养最佳时期;在Transwell实验中表现出与胶原蛋白I胶相似的细胞侵袭力,并优于BME培养基;在紫杉醇耐药实验中形成细胞3D结构耐药性要高于2D细胞培养（P〈0．05）;与BME和胶原蛋白I胶培养基相比,该细胞对相同浓度下紫杉醇耐药性差异无统计学意义（P〉0．05）。结论：自制的甲基乙烯基彬马来酸共聚物和交联剂聚乙二醇交联反应形成的3D培养基质水凝胶,与商品化BME胶和胶原蛋白胶I胶培养基相比,具有类似的细胞培养功能。