解偶联蛋白2与酒精性肝病

解偶联蛋白2(UCP2)是线粒体内膜上可以调节质子跨膜转运的载体蛋白,可以驱散质子电化学梯度,使氧化呼吸与ATP合成解偶联。UCP2与能量消耗和脂质代谢密切相关,可能参与酒精性肝病(ALD)发病过程中的氧化应激和脂质过氧化。进一步探讨UCP2在ALD中的作用对于ALD的防治具有重要意义。     

2型糖尿病并脂肪肝大鼠肝脏解偶联蛋白2表达及罗格列酮的干预作用

解偶联蛋白2（UCP2）是线粒体内膜上具有调节质子跨膜转运作用的阴离子转运蛋白。这种介导质子的跨膜内流,在调节能量代谢、脂肪酸的B氧化等均有重要作用。2型糖尿病（T2DM）患者中非酒精性脂肪性肝病（NAFLD）的发生率高达50％以上,脂肪肝患者UCP2的表达是一把“双刃剑”,对NAFLD的发生及预后起着至关重要的作用。本研究通过高脂饲养加小剂量STZ制成T2DM并NAFLD大鼠模型．观察各组间大鼠肝脏UCP2蛋白和mRNA表达,并探讨罗格列酮对脂肪肝的于预效果及可能的作用机制。     

解偶联蛋白与低氧寒冷的关系

机体能量代谢是一个非常复杂的过程,线粒体在能量代谢中发挥着重要作用.解偶联蛋白( uncoupling proteins,UCPs)是线粒体内膜上具有调节质子跨膜转运作用的蛋白家族,能够降低线粒体内膜上的质子梯度,使呼吸链和ATP合成解偶联,将产能转化为产热,提高静息代谢率.UCPs在适应性产热、体重调节和新陈代谢中发...     

解偶联蛋白2在非酒精性脂肪肝中的作用探讨

随着生活水平的不断提高，饮食结构和生活方式的改变，脂肪肝已成为仅次于病毒性肝炎的第二大肝病。脂肪肝的发病机制目前尚不十分清楚，多种因素、多种细胞因子参与其发病；解偶联蛋白2(UCP2)是近年发现的一种线粒体内膜上的载体蛋白，它与线粒体ATP合成、脂质代谢等密切相关。现对UCP2与肥胖、游离脂肪酸(FFA)、活性氧(ROS)、脂质过氧化物(LPO)、胰岛素、瘦素以及肿瘤坏死因子(TNFα)等因素的美系作一阐述．以探讨UCP2在非酒精性脂肪肝(NAFLD)发病中的可能作用。     

解偶联蛋白2与2型糖尿病关系研究进展

2型糖尿病作为严重影响人类健康的慢性病、多发病,已经成为全球共同关注的健康及社会问题,其发病机制是目前研究的热点.最近,越来越多的研究者关注解偶联蛋白2(UCP2)与2型糖尿病的相关性,并且发现UCP2参与和影响2型糖尿病的发生、发展过程中的多个环节.     

线粒体解偶联蛋白2在心力衰竭及运动心肌损伤中的研究进展

<正>几乎所有类型的心脏、大血管疾病均可引起心力衰竭(心衰)。心衰时,机体会启动一系列代偿机制,如心脏前负荷增加、心肌肥厚、交感兴奋性增强、RAAS激活等。心肌肥厚以心肌纤维增多为主,能源供体的线粒体也相应增多。解偶联蛋白2(uncoupling protein 2,UCP2)是位于线粒体内膜上的质子转运体,通过将内膜外的H+转运回线粒体基质,导致氧化磷酸化解偶联。在心衰的发生发展过程中,UCP2的解偶联作用可以减少活性氧(reactive oxygen     

解偶联蛋白与非酒精性脂肪性肝病

非酒精性脂肪性肝病(NAFLD)的发病机制未明,目前认为在“二次打击学说”的基础上,线粒体功能失调与内质网应激贯穿于其发生发展过程中.其中解偶联蛋白(UCP)因其通过氧化磷酸化解偶联影响ATP合成和氧化应激产生的作用而备受关注.此文总结了UCP的基本情况及其在NAFLD中的研究进展,重点阐述了UCP2在“二次打击”不同阶段中的作用,以期为NAFLD发病机制提供新理论依据.     

解偶联蛋白3与2型糖尿病

解偶联蛋白3(UCP3)是线粒体内膜上的质子载体,近年来的研究表明UCP3除与能量代谢有关,更与减少氧化损伤、脂肪酸代谢以及2型糖尿病密切相关,本文对此进行综述.     

力竭运动时心肌线粒体解偶联蛋白2介导的心肌损伤

解偶联蛋白(uncoupling protein,UCP)2是线粒体内膜上的一种蛋白质,具有调控机体能量代谢,调节活性氧产生,参与心肌细胞凋亡,调节糖脂代谢等功能。急性力竭运动后UCP2表达增加,其作用有利有弊。该文主要介绍力竭运动时UCP2作用的研究进展。     

解偶联蛋白2与心力衰竭的关系

解偶联蛋白(UCPs)由细胞核内DNA编码,在线粒体内膜表达,它能够通透线粒体质子梯度,减少三磷酸腺苷(ATP)合成的动力,使能量以热能的形式释放.UCP2是其中一个亚型,在心力衰竭时UCP2表达明显上调,在能量代谢、氧化应激、细胞及线粒体Ca2+水平、心肌兴奋-收缩偶联、细胞凋亡等多方面发挥重要的作用,这些作用与心力衰竭密切相关.此文简述UCP2与心力衰竭的关系.     

Pathogenesis of carcinoma of the papilla of Vater

Most adenomas and carcinomas of the small intestine and extrahepatic bile ducts arise in the region of the papilla of Vater. In familial adenomatous polyposis (FAP) it is the main location for carcinomas after proctocolectomy. In many cases symptoms due to stenosis lead to diagnosis at an early tumor stage. In about 80%, curative intended resection is possible. Operability is the most relevant prognostic factor. Most ampullary carcinomas resp. carcinomas of the papilla of Vater develop from adenomatous or flat dysplastic precursor lesions. They can be sited in the ampulloduodenal part of the papilla of Vater, which is lined by intestinal mucosa. They also can develop in deeper parts of the ampulla, which are lined by pancreaticobiliary duct mucosa. Intestinal-type adenocarcinoma and pancreaticobiliary-type adenocarcinoma represent the main histological types of ampullary carcinoma. Furthermore, there exist unusual types and undifferentiated carcinomas. Many carcinomas of intestinal type express the immunohistochemical marker profile of intestinal mucosa (keratin 7?, keratin 20+, MUC2+). Carcinomas of pancreaticobiliary type usually show the immunohistochemical profile of pancreaticobiliary duct mucosa (keratin 7+, keratin 20?, MUC2?). Even poorly differentiated carcinomas, as well as unusual histological types, may conserve the marker profile of the mucosa they developed from. These findings underline the concept of histogenetically different carcinomas of the papilla of Vater which develop either from intestinal- or from pancreaticobiliary-type mucosa of the papilla of Vater. Molecular alterations in ampullary carcinomas are similar to those of colorectal as well as pancreatic carcinomas, although they appear at different frequencies. In future studies, molecular alterations in ampullary carcinomas should be correlated closely with the different histologic tumor types. Consequently, the histologic classification should reflect the histogenesis of ampullary tumors from the two different types of papillary mucosa.     

Demonstration of the mechanism of action of biguanides

Summary Palmitic acid oxidation in rat diaphragm homogenate is depressed by biguanide concentrations that are still incapable of inhibiting oxidative phosphorylation. Glucose oxidation is not directly effected by the same biguanide concentrations: however, the inhibitory effect of palmitic acid on glucose oxidation is partly removed by biguanides. Inhibition of fatty acid oxidation, which accounts for most of the metabolic effects caused by these drugs, can be regarded as the fundamental mechanism of action of biguanides. There is some evidence suggesting that these drugs might interact with carnitine, thus preventing long-chain fatty acids from being transported across the mitochondrial membrane to the site of oxidation. Traduzione a cura degli AA.     

胰岛素瘤的解剖分布特点分析

目的胰岛素瘤是最常见的胰腺神经内分泌肿瘤，因其临床表现多样，导致诊断困难。影像学诊断尤其是超声内镜(EUS)在胰岛素瘤的诊断中起着重要作用，拥有较高的敏感性和特异性。本研究拟通过明确胰岛素瘤的解剖分布特点，以期有助于提高影像学的诊断准确率和降低漏诊率，尤其是在教育和培训实践中对于EUS的学习者更具有指导价值。 方法回顾性分析解放军总医院第一医学中心病案资料数据库1993年1月至2019年11月经外科手术、病理确诊为胰岛素瘤的患者的临床资料，检索方法采取搜索术后病理诊断为"胰岛素瘤"的病例，通过查阅病例的方法，提取出胰岛素瘤的大小和解剖分布等数据，进一步分析其特点。 结果共检索到确诊为胰岛素瘤的患者116例，其中，男45例、女71例，年龄13～76岁，平均年龄(44.4±14.85)岁。胰岛素瘤单发110例(94.8%)、多发6例(5.2%)。位置分布：头颈部46例(39.7%)，单发45例、多发1例；体尾部68例(58.6%)，单发65例、多发3例；全胰腺多发2例(1.7%)。病变大小特点：最大径0.4～3.4 cm，平均大小(1.53±0.58)cm。≤1 cm 29例、>1 cm而≤1.5 cm41例、>1.5 cm而≤2.0 cm28例，≤3 cm 15例，>3 cm 3例。年龄与肿瘤的大小相关，≤44岁患者肿瘤平均大小为(1.36±0.51)cm、>44岁患者肿瘤平均大小为(1.70±0.60)cm，P<0.05。头颈部的肿瘤大于体尾部的肿瘤，头颈部肿瘤平均大小(1.66±0.63)cm，体尾部(1.42±0.52)cm，P<0.05。 结论胰岛素瘤在胰腺体尾部较头颈部更好发；绝大多数单发，但可以全胰腺多发；多数小于1.5 cm，肿瘤的大小与患者年龄和肿瘤的解剖分布相关。     

氯硝柳胺悬浮剂的毒性评价

目的评价氯硝柳胺悬浮剂的毒性，为现场大规模应用灭螺提供依据。方法按照中华人民共和国国家标准GB 15670-1995《农药登记毒理学试验方法》和鱼类毒性试验方法进行。结果经口、经皮肤的LDso雌、雄性大鼠均>5 000 mg/kg，经呼吸道的LCso雌、雄性大鼠均>5 000mg/m3，该药经口、经皮肤、经呼吸道毒性均属微毒类药物；兔眼用药后，观察期内无不良反应，对眼无刺激性；皮肤用药后对皮肤无刺激性。与氯硝柳胺原药、氯硝柳胺乙醇胺盐原药和氯硝柳胺乙醇胺盐可湿性粉剂相比，氯硝柳胺悬浮剂对鱼急性毒性最低。结论氯硝柳胺悬浮剂属微毒类药物，对鱼的毒性低于其乙醇胺盐可湿性粉剂，适合于现场应用。     

Lack of correlation of degree of villous atrophy with severity of clinical presentation of coeliac disease

BACKGROUND AND AIM: Both the clinical presentation and the degree of mucosal damage in coeliac disease vary greatly. In view of conflicting information as to whether the mode of presentation correlates with the degree of villous atrophy, we reviewed a large cohort of patients with coeliac disease. PATIENTS AND METHODS: We correlated mode of presentation (classical, diarrhoea predominant or atypical/silent) with histology of duodenal biopsies and examined their trends over time. RESULTS: The cohort consisted of 499 adults, mean age 44.1 years, 68% females. The majority had silent coeliac disease (56%) and total villous atrophy (65%). There was no correlation of mode of presentation with the degree of villous atrophy (p=0.25). Sixty-eight percent of females and 58% of males had a severe villous atrophy (p=0.052). There was a significant trend over time for a greater proportion of patients presenting as atypical/silent coeliac disease and having partial villous atrophy, though the majority still had total villous atrophy. CONCLUSIONS: Among our patients the degree of villous atrophy in duodenal biopsies did not correlate with the mode of presentation, indicating that factors other than the degree of villous atrophy must account for diarrhoea in coeliac disease.     

CagA-Hp抗体IgG与胃炎的组织学分析

研究幽门螺杆菌(Hp)感染与胃炎的关系。方法对204例慢性胃炎患者胃粘膜进行观察分析,并测定其中137例Hp阳性患者血清CagA-Hp抗体IgG水平,与组织学对照。结果慢性萎缩性胃炎伴肠上皮化生患者血清CagA抗体IgG明显高于对照组(P＜0.01);其他类型胃炎患者血清CagA抗体IgG水平无明显增高(P＞0.05)。结论CagA-Hp可能是导致慢性萎缩性胃炎伴肠上皮化生的因素之一,对这类患者应密切随访观察。     

慢阻肺急性加重期患者预后的影响因素分析

目的探讨慢性阻塞性肺病急性加重期(AECOPD)患者预后的相关危险因素。方法回顾性调查、收集58例AECOPD患者可能影响其预后的相关因素,并对其分别进行单因素分析。并进行Logistic多元逐步回归进行多因素分析,筛选影响AECOPD患者预后的独立危险因素。结果单因素分析后将结果 P0.1的因素纳入多因素Logistic回归,分析发现是否合并呼吸衰竭、气促程度、白细胞计数、APACHEⅡ、应用抗氧化剂、慢阻肺治疗依从性为影响AECOPD患者预后不佳的独立因素(P0.05)。结论根据AECOPD患者预后的独立危险因素,及早判断,选择合适的后续治疗方案,对提高其生存率及生存质量具有重要意义。     

血吸虫童虫生长发育及其机制的研究进展

血吸虫童虫是宿主免疫系统攻击的重要靶标,包括皮肤型、肺型和肝门型童虫。宿主分子对童虫生长发育具有重要作用。童虫生长发育机制包括免疫调节、信号转导、性别发育及凋亡等。肌动蛋白、组织蛋白酶、烯醇化酶和葡萄糖基转移酶等分子为血吸虫童虫生长发育的重要分子。本文对血吸虫童虫生长发育及其机制的研究进展做一综述。     

Results of treatment of fistula-in-ano

To evaluate the application of Parks' classification in the management of patients with fistula-in-ano, a study was undertaken to assess the outcome of surgery, especially with respect to the recurrence rate and alteration of continence. A retrospective analysis of 160 consecutive patients who were classified at the time of operation was conducted. The distribution of fistulas was as follows: intersphincteric, 41.9 percent, transsphincteric, 52.1 percent, suprasphincteric, 1.3 percent, extrasphincteric, 0. A horseshoe extension occurred in 8.8 percent of the fistulas and 3.8 percent did not exactly conform to the classification as they were either complex or combinations of more than one type of fistula. The sole immediate postoperative complication was bleeding, which occurred one week postoperatively and ceased spontaneously (0.7 percent). Alteration in continence occurred in 6 percent of patients with 2.6 percent experiencing temporary incontinence to flatus, 1.3 percent to liquid stool, and 0.7 percent to solid stool. Permanent loss of control for flatus occurred in one patient (0.7 percent) and for liquid stool in one patient (0.7 percent). No patients suffered loss of control for solid stool. Recurrence developed in 6.3 percent of patients, all between five and 25 months postoperatively. Classifcation was found to be a useful guide in the operative management of patients with fistula-in-ano. Read at the joint meeting of the American Society of Colon and Rectal Surgeons with the Section of Colo-Proctology, Royal Society of Medicine, and the Section of Colonic and Rectal Surgery, Royal Australasian College of Surgeons, New Orleans, Louisiana, May 6 to 11, 1984.     

Intake of energy drinks in association with alcoholic beverages in a cohort of students of the School of Medicine of the University of Messina

BACKGROUND: Energy drinks (ED) are a widely used group of beverages known for their stimulant effects on central nervous system (CNS). The main components of ED are caffeine, taurine, carbohydrates, glucuronolactone, inositol, niacin, pantenol, and beta-complex vitamins. The studies evaluating the effects of ED describe improvements in attention and/or reaction times and indices of alertness. It has been also shown that combination of caffeine and glucose, fundamental constituents of ED, can ameliorate deficits in cognitive performance and subjective fatigue during extended periods of cognitive demand. Moreover, the associated ingestion of alcohol and ED has recently been observed to be becoming more and more widespread. METHODS: With the aim to know the habits and uses of students, we administered a questionnaire containing questions regarding ED drinking alone or in association with alcoholic beverages. Five hundred students of the School of Medicine of the University of Messina were interviewed, and 450 filled the questionnaire. RESULTS: A total of 56.9% of students declared using ED. A great part of users (48.4%) associate frequently ED and alcohol. In particular, 35.8% of ED + alcohol users have used ED + alcohol more than 3 times in the last month. Distinguishing the users into 2 groups (users of ED + alcohol and users of both ED and ED + alcohol), we observed in the second group a major use of cocktail containing a mix of ED and alcoholic beverages. This difference between the 2 groups is less represented about the ingestion of ED + alcohol in the night. CONCLUSIONS: Our data indicate that association of ED + alcohol is very popular among students. This behavior can be dangerous. In fact, the combination of ED + alcoholic drinks can reduce adversive symptoms of alcohol intoxication including the depressant effects. As consequence, users of ED + alcoholic beverages might not feel the signs of alcohol intoxication, thus increasing the probability of accidents and/or favoring the possibility of development of alcohol dependence.