荷人鼻咽癌裸鼠骨髓细胞DNA合成及凋亡相关基因表达的生物节律的初步研究

背景与目的:有关鼻咽癌的生物节律特征尚未见文献报道。本文拟探索荷人鼻咽癌裸鼠骨髓细胞的DNA合成及几种凋亡相关基因表达的生物节律,为临床制定鼻咽癌时辰化疗方案提供必要的参数。方法:BALB/C裸小鼠69只,置于程控的独立光照系统(12h光照,12h黑暗)同步化至少3周。然后双侧腋窝皮下接种人鼻咽低分化鳞癌细胞(CNE-2)裸小鼠移植瘤,成瘤后按6个不同时间点分批处死小鼠,收集骨髓细胞,固定、染色后流式细胞仪测DNA含量,用ANOVA法检验各期细胞在6个时间点差异的显著性,Cosinor法考察G1、S、G2/M期细胞在24h的分布是否符合余弦函数。部分骨髓细胞经裂解、蛋白定量后用WesternBlot法检测不同时间点p53、p21和Bcl-2三种基因蛋白表达的变化情况。结果:G1、S、G2/M期细胞在3、7、11、15、19、23HALO(HoursAfterLightOnset即灯亮后第3、7、11、19、23h)的分布随时间变化有显著性差异,G1、G2/M期细胞24h变化符合余弦节律,高峰值分别位于10.8HALO和1.8HALO。骨髓细胞p53和Bcl-2蛋白表达24h强度不同。p53在11HALO最强,在7HALO最弱;Bcl-2在15HALO最强,在19HALO最弱,p21蛋白未见表达。结论:荷人鼻咽癌裸小鼠骨髓细胞DNA合成随昼夜交替呈节律变化,p53和Bcl-2蛋白表达随昼夜时间变化而规律性波动。

Protective role of adiponectin in a rat model of intestinal ischemia reperfusion injury

AIM: To determine the potential protective role of adiponectin in intestinal ischemia reperfusion(I/R) injury.METHODS: A rat model of intestinal I/R injury was established. The serum level of adiponectin in rats with intestinal I/R injury was determined by enzymelinked immunosorbent assay(ELISA). The serum levels of interleukin(IL)-1β, IL-6, and tumor necrosis factor(TNF)-α were also measured by ELISA. Apoptosis of intestinal cells was detected using the terminal deoxynucleotidyl transferase d UTP nick end labeling assay. The production of malondialdehyde(MDA) and superoxide dismutase(SOD) and villous injury scores were also measured.RESULTS: Adiponectin was downregulated in the serum of rats with intestinal I/R injury compared with sham rats. No significant changes in the expression of adiponectin receptor 1 and adiponectin receptor 2 were found between sham and I/R rats. Pre-treatment with recombinant adiponectin attenuated intestinal I/R injury. The production of pro-inflammatory cytokines,including IL-6, IL-1β, and TNF-α, in rats with intestinal I/R injury was reduced by adiponectin pre-treatment. The production of MDA was inhibited, and the release of SOD was restored by adiponectin pre-treatment in rats with intestinal I/R injury. Adiponectin pre-treatment also inhibited cell apoptosis in these rats. Treatment with the AMP-activated protein kinase(AMPK) signaling pathway inhibitor, compound C, or the heme oxygenase 1(HO-1) inhibitor, Snpp, attenuated the protective effects of adiponectin against intestinal I/R injury. CONCLUSION: Adiponectin exhibits protective effects against intestinal I/R injury, which may involve the AMPK/HO-1 pathway.

Clinical characteristics of ocular toxocariasis in adults in north China

AIM: To investigate the clinical features of adult patients with ocular toxocariasis(OT) in north China and to diagnose adults OT patients in early stage.METHODS: Clinical data of 24 adults with OT were retrospectively analyzed.Slit lamp photographs and fundus photographs and other imaging examinations of all the patients were reviewed.A questionnaire concerning the pet ownership and place of residence was completed to investigate the possible infection origin.Descriptive statistical analyses were performed on the demographic data, clinical features, funduscopic findings and ELISA results.RESULTS: Among the 24 patients diagnosed with OT by Toxocara IgG antibody in intraocular fluid, 16(66.7%) eyes were right eye.The onset age of 12 eyes(50.0%) was between 30 and 40 years old, and 21(87.5%) eyes were of peripheral granuloma type.The most common sign was vitreous opacity.Granulomas were detected in all the eyes, and 20(83.3%) patients resided in rural area.In 4 patients, the concentration of anti-Toxocara antibody both in anterior humor and in vitreous humor were detected, and the results showed the concentration in vitreous humor was much higher than aqueous humor.CONCLUSION: Our study analyzes the clinical manifestation of OT in adults, which may have been underrecognized before.Eye side, residence, and detection of granuloma may help us in diagnosis of OT in patients with monocular vitreous opacity.For adult patients with presumed OT, negative results of anti-Toxocara antibody in anterior humor cannot rule out the possibility of OT, further detection of vitreous humor is suggested for final diagnosis.

Effects of clopidogrel on coagulation function, antioxidant and related cytokines in patients with coronary heart disease

Objective: To investigate the effects of clopidogrel on coagulation function, antioxidant and related cytokines in patients with coronary heart disease. Methods: A total of 160 patients with coronary heart disease were collected and randomly divided into control group and observation group, 80 cases in each group. The patients in the control group were treated with rosuvastatin calcium tablets and aspirin, and patients in the observation group were treated with clopidogrel on the basis of the control group. The serum levels of MCP-1, sE-selectin, PT, APTT, TT, FIB, TAC, SOD, sCD40L, VASP and tPAI-1 were compared before and after treatment in two groups. Results: After treatment, the levels of MCP-1, sE-selectin, FIB, tPAI-1 and sCD40L in the serum of the patients in the two groups were significantly lower than those before the treatment, and the levels of MCP-1, sE-selectin, FIB, tPAI-1 and sCD40L of the patients in the observation group were significantly lower than those in the control group, all differences were significant. After treatment, the levels of serum T-AOC, SOD and VASP of the patients in the two groups were significantly higher than those before the treatment, and the levels of T-AOC, SOD and VASP of the patients in the observation group were significantly higher than those in the control group, all differences were significant. Conclusion: Clopidogrel has a good effect on patients with coronary heart disease, and it can improve coagulation function and antioxidant capacity. The effect is remarkable.