排序方式: 共有15条查询结果,搜索用时 15 毫秒
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目的:探讨T-piece复苏器在产房中对早产儿复苏中的应用效果。方法:选择2011年1月至2016年12月在本院产科出生的早产儿(胎龄28~37周)62例,随机分为对照组与观察组,各31例,对照组患儿给予自动充气式复苏囊正压人工通气,观察组患儿给予T组合复苏器正压人工通气,比较两组患儿1、5、10 min Apgar评分、肺气漏发生率,以及缺氧缺血性脑病、支气管肺发育不良、坏死性小肠结肠炎、动脉导管未闭、高胆红素血症率。结果:两组患儿胎龄、性别、分娩方式、出生体重、出生后1、5、10 min Apgar评分等方面差异均无统计学意义(P0.05)。与对照组相比,观察组气漏发生率降低,差异有统计学意义(P0.05)。两组患儿缺氧缺血性脑病、支气管肺发育不良、坏死性小肠结肠炎、动脉导管未闭、高胆红素血症率差异无统计学意义(P0.05)。结论:T-piece复苏器在产房中早产儿窒息复苏中的应用效果显著,具有操作简单、效率高等优点,两组复苏成功率差别不大,但T-piece复苏器能可有效减少肺气漏的发生,进而降低新生儿的病死率。 相似文献
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哺乳动物雷帕霉素靶蛋白mTOR是一种非典型丝氨酸/苏氨酸蛋白激酶,可整合细胞外信号,磷酸化下游靶蛋白核糖体p70S6激酶,如S6K1及4E—BP1,影响转录与翻译,从而参与调控细胞生长、增殖等过程。近年来研究发现,调控mTOR通路可以干预某些疾病的病理过程。mTOR研究的新发现,可望为今后相关疾病的治疗提供新的靶点。 相似文献
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三种中药制剂Ams-11、Fw-13、Tul-17逆转肿瘤细胞多药耐药性的研究 总被引:2,自引:0,他引:2
为寻找能有效逆转肿瘤细胞多药耐药性的药物,通过体外细胞实验对Ams-11、Fw-13、Tul-17三种中药制剂逆转肿瘤细胞多药耐药性的作用进行了分析。并用流式细胞仪测定了Tul-17处理细胞后药物累积程度的变化及细胞P糖蛋白表达情况。为进一步研究体外细胞实验筛选出的多药耐药逆转剂在体内的药效学,将其中Fw13用于人白血病K562/ADR裸鼠移植瘤逆转试验。结果:在无细胞毒性的剂量范围内,该三种中药制剂均能明显增强多药耐药细胞对抗癌药物的敏感性,而且其逆转作用呈剂量依赖关系。Tu-17处理后,K562耐药细胞表达的P糖蛋白较对照降低1.5倍,对罗丹明123的累积量是对照的2.5倍。用Fw13治疗人白血病K562/ADR裸鼠移植瘤,可将硫酸长春新碱(VCR)对K562/ADR的抑瘤率从19.79%提高到86.59%,与单独VCR治疗疗效有显著性差异(P<0.05)。结果表明,这三种中药制剂可望成为肿瘤多药耐药逆转剂,在肿瘤化疗中发挥作用。 相似文献
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Inhibition of telomerase in tumor cells by ribozyme targeting telomerase RNA component 总被引:1,自引:0,他引:1
Telomerase plays an important role in cell proliferation and carcinogenesis and is believed to be a good target for anti-cancer drugs. Elimination of template function of telomerase RNA may repress the telomerase activity. A hammer-headed ribozyme (telomerase ribozyme, te-loRZ) directed against the RNA component of human telomerase (hTR) was designed and synthesized. TeloRZ showed a specific cleavage activity against the hTR. The cleavage efficacy reached 60%. A eukaryotic expression plasmid containing teloRZ gene was inducted into HeLa cells by lipofectamine, the telomerase activity in HeLa cells expressing teloRZ decreased to one eighth of that in the control cells. The doubling time increased significantly and the apoptosis ratio was elevated with increasing population doublings (PDS). After 19-20 PDS 95% cells were apoptotic. To further investigate the effect of teloRZ on tumor growth, the eukaryotic expression plasmid containing teloRZ was injected into transplanted tumor of nude mouse. The teloRZ e 相似文献
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Ribozyme抑制端粒酶活性的肿瘤基因治疗 总被引:8,自引:0,他引:8
针对端粒酶RNA组分模板区设计合成锤头状端粒酶核酶(teloRZ),构建了teloRZ基因体外转录质粒PSPT19-teloRZ和真核表达质粒PXJ-neo-teloRZ.用T7/SP6体外转录系统检测了teloRZ对端粒酶RNA组分的体外切割效率,达60%左右.用脂质体介导法, 将PXJ-neo-teloRZ导入HeLa细胞和裸鼠移植瘤,结果使HeLa细胞端粒酶活性降至对照细胞的11%~12.5%, 细胞生长速度明显变慢,传至19~20代时出现95%凋亡.裸鼠移植瘤注射PXJ-neo-teloRZ 14 d后,端粒酶活性下降69%,抑瘤率达62%.实验表明,该核酶可望成为有效的端粒酶抑制剂,在肿瘤治疗中发挥作用. 相似文献
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Telomerase plays an important role in cell proliferation and carcinogenesis and is believed to be a good target for anti-cancer
drugs. Elimination of template function of telomerase RNA may repress the telomerase activity. A hammer-headed ribozyme (telomerase
ribozyme, teloRZ) directed against the RNA component of human telomerase (hTR) was designed and synthesized. TeloRZ showed
a specific cleavage activity against the hTR. The cleavage efficacy reached 60%. A eukaryotic expression plasmid containing
teloRZ gene was inducted into HeLa cells by lipofectamine, the telomerase activity in HeLa cells expressing teloRZ decreased to
one eighth of that in the control cells. The doubling time increased significantly and the apoptosis ratio was elevated with
increasing population doublings (PDS). After 19–20 PDS 95% cells were apoptotic. To further investigate the effect of teloRZ
on tumor growth, the eukaryotic expression plasmid containing teloRZ was injected into transplanted tumor of nude mouse. The teloRZ effectively inhibited the telomerase activity in transplanted
tumor, promoted apoptosis of the transplanted tumor cells, and decreased the tumor size significantly. These results indicate
that teloRZ can effectively inhibit telomerase activity and growth of tumor cells, and suggest the potential use of this ribozyme
in anti-cancer therapy. 相似文献