Late Effects in Mouse Heart after 60Co γ-irradiation of the Brain: An Ultrastructural Study

Summary

A single dose of 8 or 20 Gy ⁶⁰Co γ-rays was given to C3H male mice at 4 months of age. Degenerative changes in the cardiac muscle due to brain irradiation were observed first at 6 months after irradiation, and became progressively more severe at 12–24 months. The changes seen at the ultrastructural level included myofibrillolysis, the presence of lysosomal-like bodies and interstitial fibrosis. Ultrastructural changes in the control cardiac muscle throughout the experimental period were monitored and only minor aging changes were noted. The coronary arteries of control mice began to show a slight amount of smooth muscle degeneration and fibrosis 1 year into the experiment. At 18 months the lesions became more severe, and at 24 months there was relatively less distinction between the control and the 20 Gy treated group. Degenerative changes in the coronary arteries were noticed at 6 months after irradiation, and became progressively more severe at later times (12–24 months). The major changes included smooth muscle degeneration with fibrosis and the accumulation of debris and extracellular matrix. At 18 months the medial smooth muscle showed severe damage, with accumulations of matrix material and debris. There was additional fibrosis in the adventitial layer. There were few additional changes at 24 months after 20 Gy irradiation. Quantitative analyses indicated that the average fractional volumes of degenerated smooth muscle cells were 13, 27 and 39% in the unirradiated group at 12, 18 and 24 months, respectively, and 13 and 29% in the sham-irradiated group at 12 and 18 months into the experiment, respectively. These percentages were 12, 32 and 49% (P < 0·05) after 8 Gy irradiation, and 19% (P < 0·05), 46% (P < 0·01), and 42% after 20 Gy irradiation, respectively.     

2010、2011年广州市越秀区空气污染物AQI与呼吸系统疾病死亡的Poisson回归分析研究

[目的]探讨广州市越秀区空气污染物AQI对呼吸系统疾病死亡的影响。[方法]收集2010、2011年广州市越秀区呼吸系统疾病死亡数据和越秀区气象及大气污染物数据,采用广义线性模型模块,拟合Poisson回归分析空气各污染物空气质量指数（AQI）、综合AQI和空气质量分级与呼吸系统疾病死亡的影响。[结果]2010、2011年广州市越秀区因呼吸系统疾病死亡病例有2 678例。SO2AQI与呼吸系统疾病死亡有统计学意义,SO2AQI每升高1个单位,其危险度约增加1%（RR=1.01,P〈0.05）;综合AQI的变化和空气质量等级与呼吸系统疾病死亡无统计学意义。[结论]广州市越秀区空气污染物中SO2是呼吸系统相关因素死亡的危险因素。     

DBC1的研究进展

DBC1是近年来新发现的一种蛋白,属于小GTP酶类Rho家族的非典型成员。最初因为在乳腺癌组织中杂合性缺失被鉴定出来的。目前关于DBC1在乳腺癌上的研究报道尚少。本文对国内外关于该基因的有关研究进行综述,了解其分子机制,基因表达情况。     

自噬相关蛋白Atg5在BPA所致肝脏脂质沉积中的作用研究

目的:观察自噬相关蛋白Atg5是否介导双酚A(bisphenol A,BPA)所致的肝脏脂质沉积。方法:将Hep G2肝细胞分为对照组、BPA不同浓度(1、10μmol/L)干预组、阳性对照组即200μmol/L油酸(oleic acid,OA)联合400μmol/L软脂酸(Palmitic acid,PA),分别给予上述不同干预24 h。采用化学酶促-比色法定量检测细胞内甘油三酯(triglyceride,TG)含量,油红O染色观察细胞内脂滴沉积情况。Real-time PCR及Western blot、免疫荧光方法检测在不同干预情况下Hep G2细胞内Atg5的表达水平。结果:1不同浓度BPA干预后,Hep G2细胞内TG含量均有不同程度的升高,其中10μmol/L BPA组升高具有统计学意义(0.197±0.033;0.094±0.014,P=0.031);2油红O染色结果与TG定量一致。3Real-time PCR结果表明,与对照组相比10μmol/L BPA组Atg5 m RNA表达并无明显变化(0.93±0.088;1.017 5±0.062 4,t=0.811,P=0.428);Western blot结果显示与对照组相比10μmol/L BPA组其蛋白表达明显减少(0.519±0.059;1,t=0.8101,P=0.000);免疫荧光进一步检测发现,与对照组相比10μmol/L BPA组Atg5荧光小点数量明显减少。结论:自噬相关蛋白Atg5可能介导BPA所致的肝脏脂质沉积的发生。     

环球航行不同气温对24 h动态心电图变化的影响

目的：观察海军水面舰艇编队环球航行不同气温对24h动态心电图变化的影响。方法：98名参加环球航行人员在气温〈30℃和≥30℃时的24h动态心电图监测，分析窦性心律、对早搏、ST段、QT间期离散度和心率变异性的时域、频域和非线性指标变化进行分析。结果：与气温〈30℃时比较，气温≥30℃时的平均心率加快，最高心率减慢，最低心率加快，停搏次数增多，最长停搏时间延长，早搏增多，MV5导联ST段明显压低、压低持续时间延长，QTd、QTc、QTcd明显增高，SDNN、SDANN、SDNN指数、RMSSD、NN50、PNN50、三角指数、VLF、HLF、VAI及VLI明显降低（P〈0．01）。结论：气温≥30℃时海军水面舰艇编队环球航行时，对人体有支配心脏的自主神经功能可能有影响。     

经单侧6F导引导管应用球囊辅助技术栓塞脑动脉瘤的体会

目的:探讨经单侧6F导引导管应用球囊辅助技术治疗脑动脉瘤的临床应用价值。方法:对15例脑动脉瘤患者常规经股动脉穿刺置入6F动脉鞘,先使用5F诊断造影管行全脑血管造影术,然后将6F Envoy导引导管置于载瘤的颈内动脉或椎动脉,借助于微导丝将微导管和球囊导管通过Y形阀或蝶形阀一起送入导引导管至动脉瘤处.在球囊保护下行动脉瘤栓塞术。结果:本组15例均成功通过单侧6F导引导管置入球囊导管和输送弹簧圈的微导管。操作顺利,无手术死亡及相关并发症。结论:经单侧6F导引导管可以顺利应用球囊辅助技术辅助栓塞治疗脑动脉瘤,操作安全、简便.可在临床推广使用。     

Diagnostic and therapeutic evaluation of 111In-vinorelbine-liposomes in a human colorectal carcinoma HT-29/luc-bearing animal model

Colorectal carcinoma is a highly prevalent and common cause of cancer in Taiwan. There is still no available cure for this malignant disease. To address this issue, we applied the multimodality of molecular imaging to explore the efficacy of diagnostic and therapeutic nanoradiopharmaceuticals in an animal model of human colorectal adenocarcinoma [colorectal cancer (CRC)] that stably expresses luciferase (luc) as a reporter. In this study, an in vivo therapeutic efficacy evaluation of dual-nanoliposome (100 nm in diameter) encaged vinorelbine (VNB) and (111)In-oxine on HT-29/luc mouse xenografts was carried out. HT-29/luc tumor cells were transplanted subcutaneously into male SCID mice. Multimodality of molecular imaging approaches including bioluminescence imaging (BLI), gamma scintigraphy, whole-body autoradiography (WBAR) and in vivo tumor growth tracing, histopathology and biochemistry/hematology analyses were applied on xenografted SCID mice to study the treatments with 6% polyethylene glycol (PEG) of (111)In-NanoX/VNB-liposomes. In vivo tumor growth tracing and BLI showed that tumor volume could be completely inhibited by the combination therapy with (111)In-VNB-liposomes and by chemotherapy with NanoX/VNB-liposomes (i.e., without Indium-111) (P<.01). The nuclear medicine images of gamma scintigraphy and WBAR also revealed the conspicuous inhibition of tumor growth by the combination therapy with (111)In-VNB-liposomes. Animal body weights, histopathology and biochemistry/hematology analyses were used to confirm the safety and feasibility of radiopharmaceuticals. A synergistic therapeutic effect on CRC xenografted SCID mice was proven by combining an Auger electron-emitting radioisotope (Indium-111) with an anticancer drug (VNB). This study further demonstrates the beneficial potential applications of multimodality molecular imaging as part of the diagnostic and therapeutic approaches available for the evaluation of new drugs and other strategic approaches to disease treatment.     

解毒疏络法对肺癌放疗减毒作用的临床研究

 目的 观察解毒疏络法对肺癌放疗不良反应的影响.方法 设立单纯放疗组(简称对照组)53例,放疗加解毒疏络法组(以下简称治疗组)55例.以放疗后血象、肝肾功能、免疫功能、放射性肺损伤的评定及分级、放射治疗毒性反应、中医疗效评定标准为指标进行临床疗效观察.结果 治疗组血象、肝肾功能、免疫功能、放射性肺损伤的评定及分级、放射治疗毒性反应、中医疗效评定标准优于对照组(P＜0.05).结论 解毒疏络法可一定程度地减轻放疗的不良反应.