Malondialdehyde and nitric oxide behaviour in patients with myocardial infarction

INTRODUCTION AND OBJECTIVES: The aim of this study was to determine the potential usefulness of malondialdehyde and nitric oxide as sensors of metabolic damage produced during acute coronary ischaemics events. METHODS: Serum malondialdehyde and nitric oxide levels were determined as thiobarbituric acid derivative and nitrites respectively in 15 male patients who were admitted to the emergency ward of the Hospital General del Sur de Maracaibo, because of acute stage of myocardial infarction. RESULTS: Our results show, upon follow-up and afterwards 30 days a highly significant increase in the malondialdehyde level during the acute phase of myocardial infarction (1.87 +/- 0.29 vs 45.47 +/- 8.67 mM; p < 2.01 10-5) that returns to normal levels 30 days after myocardial infarction when compared with healthy subjects of the same age (1.87 +/- 0.29 vs 4.58 +/- 1.43 mM). As for nitric oxide, levels also increased significantly during the acute phase of myocardial infarction (41.25 +/- 3.59 vs 164.63 +/- 12.7, p < 2.13 10-10 mM) and diminished significantly when compared with healthy adults of the same age 30 days after the acute event (41.25 +/- 3.59 vs 40.85 +/- 4.50 mM). CONCLUSIONS: Our results show that serum levels of malondialdehyde and nitric oxide increased significantly during acute infarction, coming back to normal levels 30 days after infarction, which suggest that both substances are potential tools to predict cardiac function recovery.     

硫代磷酸反义寡核苷酸prop5对流感病毒进入细胞的抑制作用

目的 研究硫代磷酸反义寡核苷酸prop5对流感病毒感染进入细胞的影响。方法 采用流感病毒感染A549细胞模型,设立随机序列（prop5R）和正义序列（prop5S）作为阴性对照,收集细胞培养液,采用实时荧光定量PCR检测病毒RNA拷贝数,评价反义寡核苷酸对病毒吸附和进入的影响;进一步通过血凝抑制实验检测prop5对流感病毒吸附细胞的影响,溶血抑制实验检测prop5对流感病毒进入细胞的影响。结果 prop5能够抑制流感病毒A/Jingfang/1/86（H1N1）感染A549细胞,对流感病毒吸附细胞过程没有影响,prop5能够抑制A/Jingfang/1/86（H1N1）、A/Lufang/9/93（H3N2）、A/FM/1/47（H1N1）和A/PR/8/34（H1N1）介导的膜融合。结论 prop5能抑制流感病毒进入细胞,这种额外的活性增强了prop5的抗病毒能力。     

Listeria Pneumonitis: Influence of Route of Immunization on Resistance to Airborne Infection

Mice that are immunized with an airborne inoculum of BCG are more highly resistant to airborne challenge with Mycobacterium tuberculosis than are mice that are immunized by the subcutaneous or intravenous route. To discover whether this phenomenon is peculiar to tuberculosis, we studied the influence of the route of immunization upon pulmonary resistance in Listeria monocytogenes infection. Mice were immunized by the airborne, intravenous, or footpad route and were subsequently challenged by the same route at 1 to 4 weeks after immunization. Mice were highly and uniformly resistant to intravenous challenge, regardless of the route of immunization. The route of immunization bore no influence upon resistance to footpad infection, but resistance was appreciably better in mice challenged within 2 weeks of immunization than it was at later time points. In mice immunized by the footpad and intravenous routes, the pattern of resistance to airborne and footpad challenges was similar, in that there was substantially less immunity at 4 weeks than at 2 weeks after immunization. However, mice immunized by the airborne route were highly resistant to airborne challenge, regardless of the interval between immunization and reinfection. In this last respect, resistance of the lungs to reinfection was similar after Listeria and tuberculosis pneumonitis. It is suggested that a similar pattern of resistance may prevail in pneumonitis caused by other facultative intracellular parasites.     

VEGF-A及其受体VEGFR-1与子宫内膜癌生物学行为关系的探讨

目的:检测50例子宫内膜癌组织及癌旁正常内膜组织的VEGF-A和VEGFR-1的表达情况,探讨VEGF-A及其受体VEGFR-1是否与子宫内膜癌的侵袭与转移有关。方法:采用RT-PCR技术对50例癌组织及癌旁正常组织进行VEGF-A和VEGFR-1 mRNA半定量检测;采用Western blot进行其蛋白质表达的半定量检测。结果:癌组织VEGF-A和VEGFR-1 mRNA表达水平及蛋白质水平均明显高于癌旁正常内膜组织;VEGF-A和VEGFR-1的高表达与子宫内膜癌肌层侵袭的深度有关,与淋巴结的转移无关;低分化癌组织VEGF-A的表达明显高于中、高分化,VEGFR-1的表达与细胞分化无关。结论:VEGF-A及其受体VEGFR-1的高表达可引起子宫内膜癌的肌层侵袭;癌分化越差,VEGF-A表达越高。     

回顾性分析ACEI/ARB联用激素对微小病变型肾病综合征的影响

目的 研究血管紧张素转换酶抑制剂/血管紧张素受体拮抗剂(ACEI/ARB)联合激素治疗微小病型肾病综合征(MCD)的疗效.方法 回顾性分析1998年11月至2006年10月肾活检确诊为MCD的患者,分为激素单联用ACEI或ARB组、激素联用ACEI及ARB组,及单用激素组作为对照.结果 符合入组94例,激素单联用ACEI或ARB组(36例),复发率52.78%;激素联用ACEI及ARB组(30例),复发率56.67%;单用激素组(28例),复发率46.43%,其复发率及尿蛋白转阴时间均无统计学差异(P>0.05).结论 激素联用ACEI及或ARB不能降低MCD患者的复发率及缩短尿蛋白转阴时间.     

不翻瓣技术牙种植的临床观察

目的 观察不翻瓣微创技术在牙齿种植的临床应用效果.方法 采用全景X线曲面断层和线性断层投照技术,在拟行牙齿种植区域测量牙槽骨宽度、高度、厚度,明确骨质量,术前在石膏模型上绘出骨地图,制作种植导板.选择牙种植患者,在不作粘骨膜切开的情况下植入ITI柱状螺纹种植体,对旋入扭矩大于35 N·cm者,立即安装永久基台,作塑料牙即刻负荷.记录微创种植的手术时间;通过测定术前、术后1月、3月、半年和1年的X线牙槽骨改变,作临床评价.结果 不翻瓣组平均随访时间为12.3个月,除1例在植入后发生短期的种植体周围炎外,X线检查全部种植体周围骨质无明显透射阴影区,术后6个月平均牙槽嵴骨吸收量为0.15 mm.全部种植牙健存.不翻瓣组单个牙的平均种植时间是10.4min,而对照组为25.7min,两者具有显著性差异(P＜0.01).结论 对骨质量佳的种植牙区域可采用不翻开粘骨膜瓣的微创种植技术,手术简单,手术时间短,种植成功率高.     

Multicenter retrospective study of implants loaded with functional prostheses 8 weeks after insertion

A multicenter retrospective statistical study was carried out to evaluate whether functional prosthetic loading of an implant 8 weeks after surgical insertion is acceptable clinically. Based on studies in vitro, which confirm that the fastest and best quality bone healing occurs around implants with surface treatment specifically after sanding with Al2O3 and subsequent passivity, this knowledge was applied to clinics. Four hundred and fifteen implants were inserted in 128 patients regardless of the pathology they presented and the quantity or quality of the area of the bone to be treated. Thus, all patients were included in the study independent of their physiological and pathological characteristics. The area of implant insertion, the type of prosthesis used, and the rate of success or survival of implants with bone resorption or mucositis were evaluated. With respect to the total number of implants loaded at 8 weeks, the rate of success for completely successful implants was 95.38%, and the rate of success of both partially and completely successful implants was 99.75%. Functional prosthetic loading at 8 weeks is an appropriate procedure, providing that technology of the implant surface guarantees, once the time has passed, that the osteointegration is achieved and capable of holding loading.     

Power spectra of sternocleidomastoids, splenius capitis, and upper trapezius in oblique exertions.

BACKGROUND CONTEXT: There is relatively little known concerning the spectral profile of the cervical muscles, despite the fact that neck injury and pain are quite prevalent. PURPOSE: The objective of the study was to calculate and study the power spectral characteristics of the sternocleidomastoids, splenii capitis and upper trapezii in anterolateral flexion and posterolateral extension in a ramp contraction. STUDY DESIGN/SETTING: In a laboratory setting experiments were conducted to record surface electromyographic (EMG) data from six cervical muscles and power spectral variables obtained. PATIENT SAMPLE: Forty normal and healthy young adults (21 men, 19 women). OUTCOME MEASURES: Power spectral of EMG signals. METHODS: EMG data for the left and right isometric anterolateral flexion and posterolateral extension were acquired from the sternocleidomastoids, splenii capitis and upper trapezius bilaterally. The subjects were seated in an upright posture and exerted left and right anterolateral flexor and posterolateral extensor efforts from rest to their maximal voluntary contraction in a gradual linear ramp fashion using visual feedback as a guide. The force exerted and the surface EMG data were sampled at 1 kHz at every 10th percentile grade of contraction and the EMG data were subjected to the Fast-Fourier transform analysis. The median frequency (MF), mean power frequency (MPF), peak power and total power of all six cervical muscles were analyzed. RESULTS: In the anterolateral flexion the ipsilateral sternocleidomastoid and splenius capitis had a wider band of frequency, which further widened with increasing grade of contraction. The trapezius did not engage in the same manner or to the same magnitude. The MF of the sternocleidomastoid in the anterolateral flexion in both genders progressively increased, the splenius capitis remained relatively unchanged, and the upper trapezius declined with the increasing grades of contraction. CONCLUSIONS: There is no significant difference between the genders in spectral profile. There is a bilateral symmetry in spectral profile with reference to activity; however, they are significantly different in different activities for the same muscles. With increasing magnitude of contraction power, spectral density distribution increases and the median frequency decreases. These results can serve as a useful reference for painful necks. Restoration of power spectral characteristics may indicate normalcy, which cannot be gleaned by other EMG or force variables.     

Effect of cigarette smoking on the oxidant/antioxidant balance in healthy subjects

BACKGROUND AND PURPOSE: Cigarette smoking has been associated with the development of cardiovascular disease and cancer. Even though the molecular mechanism(s) are not clear, the pathology has been related to oxygen free radicals present in cigarette smoke. Thus, the main objective of this study was to establish the changes in the oxidation/antioxidation balance induced by cigarette smoking. METHODS: Thirty healthy subjects (15 smokers and 15 nonsmokers) of both sexes were studied. The smokers group had smoked a mean of 14 cigarettes per day for an average of 4.5 years. Fasting serum levels of malondialdehyde (MDA), a marker of oxidative stress, nitric oxide (NO), reduced glutathione (GSH), and vitamin C (ascorbic and dehydroascorbic acids) were measured. RESULTS: Fasting NO concentration was significantly higher in smokers (51.3 +/- 5.3 microM) than in nonsmokers (35.2 +/- 4.8 microM, P < 0.05). The smokers had significantly higher serum dehydroascorbic acid levels (2.4 +/- 0.5 mg/dL, P < 0.03) than the nonsmokers (1.08 +/- 0.08 mg/dL). No significant differences were observed in the levels of ascorbic acid, MDA, and GSH between the smokers and nonsmokers. CONCLUSIONS: Our results suggest that exposure to cigarette smoke increases NO synthesis, such that NO may act in a compensatory way as an inhibitor of lipid peroxidation. Smoking also activates other antioxidative mechanisms such as involving vitamin C. These protective mechanisms appear to be enough in preventing accumulation of oxidative products such as MDA and avoiding oxidative damage.