236例无痛人工流产术的疗效观察

目的:探讨异丙酚和芬太尼混合液静脉麻醉、笑气吸入麻醉及2%利多卡因宫颈局部浸润麻醉三种镇痛方法在人工流产手术中的疗效比较。方法:自2003年8月至2004年1月对236例妇科门诊早孕要求终止妊娠的妇女实施无痛人工流产术。随机分成3组。A组:异丙酚+芬太尼静脉麻醉(85例);B组:N2O(笑气)吸入麻醉(88例);C组:2%利多卡因宫颈局部浸润麻醉(63例),观察人流术中其镇痛效果并对疼痛进行分级。结果:A组85例100%可达到完全不痛(疼痛分级为0级);B组65.90%可达到完全不痛,Ⅰ级23.86%,Ⅱ级9.09%,Ⅲ级1.15%;C组0例可达到完全不痛,Ⅰ级63.49%,Ⅱ级30.16%,Ⅲ级6.35%。结论:受术者如无心肺疾患及人流禁忌证,无痛人工流产术应选择异丙酚+芬太尼静脉麻醉可达到完全无痛,痛苦最小。     

As_2O_3诱导人肝癌细胞凋亡及对Fas表达和钙含量的影响

化疗在原发性肝癌的综合治疗中占重要地位.为寻找肝癌治疗新的有效药物,我们观察了As2O3对人肝癌细胞株BEL7402的生物学效应,以期为As2O3临床治疗肝癌提供实验依据.     

Arsenic trioxide–loaded, microemulsion-enhanced cytotoxicity on MDAH 2774 ovarian carcinoma cell line

The antiproliferative effect of As(2)O(3)-loaded microemulsion (As(2)O(3)-M) on human MDAH 2774 ovarian cancer cells was compared with a regular solution of the As(2)O(3). We used MDAH 2774 as model cell lines for ovarian cancer. The (2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2H-tetrazolium hydroxide) (XTT) and trypane blue dye exclusion tests were used to evaluate cytotoxicity. Apoptotic effect of solutions was evaluated using cell death detection kit. Standard microemulsion formulation used in this experiment contains 5 x 10(-6) M As(2)O(3). It was clearly demonstrated that As(2)O(3)-M had a significant cytotoxic effect on MDAH 2774 cell line, and the cytotoxic effect of As(2)O(3)-M was significantly higher than that of regular As(2)O(3) solutions. Even approximately 6000 times diluted microemulsion formulation loaded with 5 x 10(-6) M As(2)O(3) showed a cytotoxic effect. As a result, this diluted concentration (approximately 8 x 10(-10) M) was found to be approximately 6000 times more effective than regular As(2)O(3) solutions (5 x 10(-6) M). Moreover, this diluted concentration resulted in 1.5-fold enhancement of apoptosis. According to the in vitro cytotoxicity studies, we concluded that by incorporating As(2)O(3) into the microemulsion (As(2)O(3)-M), which is a new drug carrier system, it is possible to increase antiproliferative effect of regular As(2)O(3) on MDAH 2774 cells. Translating these results to in vivo conditions would open new windows in the treatment of ovarian cancer.     

硒抑制镍诱导的人肺成纤维细胞的DNA损伤

目的　探讨三氧化二镍(Ni2O3)对人肺成纤维细胞(human lung fibroblasts,HLF)的DNA损伤作用以及Na2SeO3的保护作用。方法　应用单细胞凝胶电泳(single cell gel electrophoresis,SCGE)检测DNA损伤。结果　Ni2O3 处理HLF细胞4 h,SCGE检测出DNA损伤程度高于对照组,差异有显著性(P<0.01)。而Ni2O3 Na2SeO3 处理组DNA损伤程度低于Ni2O3 组,差异有显著性(P<0.01)。结论　硒可抑制镍诱导的人肺成纤维细胞的DNA损伤。     

红细胞膜通道力学效应的探讨

在考察红细胞双凹碟形体形成的基础上,讨论了红细胞的输氧功能与红细胞变形的关系,揭示了红细胞膜通道的力学效应:当红细胞呈双凹碟形时,PiPo的地方,红细胞膜通道有释放出氧的现象,其氧的总流率为 J=Lo_2(Pio_2-Poo_2) Lp(Pi-Po) 式中Lo_2为O_2分压差引起的膜通道对氧的流导,PiO_2、Poo_2为膜内外的氧分压;Lp为由于压差引起的膜通道对氧的流导。     

过氧化氢对不同时相HepG2细胞氧化作用的研究

背景与目的:研究过氧化氢(H2O2)对不同时相HepG2细胞作用的选择性,以进一步探讨H2O2:诱导肿瘤细胞凋亡的机制.材料与方法:以胸腺嘧啶核苷(TdR)阻断法获得不同细胞周期时相的同步化细胞,分别加入800 μmol/L的H2O2作用3 h,并检测各组细胞的丙二醛(MDA)含量、黄嘌呤氧化酶(XOD)和5'核苷酸酶(5'NT)的活性及抗羟自由基(抗·OH)和抗超氧阴离子自由基(抗O2)的活性.结果:经H2O2处理的各组MDA含量和XOD、抗·OH、抗O2活性显著高于对照组,其差异均具有统计学意义(P均＜0.01),5'NT活性低于对照组(P＜0.01).与未同步化组比较,同步化于S期和G2/M期的细胞MDA含量和XOD、5'NT、抗·OH和抗O2活性显著升高,其差异均具有统计学意义(P均＜0.01),而同步化于G1期的细胞MDA含量、XOD、5'NT和抗O2-活性显著降低,差异均具有统计学意义(P均＜0.01).结论:H2O2作用同步化HepG2细胞后,代谢产生自由基的酶活性,脂质过氧化产物含量以及抗氧化水平均表现出细胞周期特异性,这可能是过氧化氢对不同时相HepG2细胞损伤作用不同的原因.