The Effect of K-ATP Channel Blockage During Erythropoietin Treatment in Renal Ischemia-Reperfusion Injury

ATP dependent K channels (K-ATP) take part in the Erythropoietin (EPO) induced cardioprotection but these channel activations have role in cytoprotective role of EPO in the renal ischemia reperfusion (IR) damage is still unknown. For this purpose rats were pretreated with EPO (500 IU/kg) and/or K-ATP channel blocker glibenclamide (40mM/kg) i.p. before bilateral renal IR damage. Renal tissues were used for histological examination and measurement of caspase-3 and TNF-α levels. Renal functions were evaluated by glomerular filtration rate (GFR) fractional excretion of sodium (FENa) and potassium (FEK). Renal TNF-α and caspase-3 levels were decreased in both glibenclamide and EPO-treated IR rats compared to untreated rats. The protection afforded by the pretreatment with EPO alone was greater than that of administering glibenclamide alone. Application of glibenclamide at the same time partly abolished the cytoprotective effect of EPO treatment. K-ATP mediated cytoprotection is not the main mechanism of protective effect of EPO.     

甜菜碱对大鼠心肌缺血再灌注损伤炎症及心肌细胞凋亡的影响

目的 探讨甜菜碱对大鼠心肌缺血再灌注（IR）损伤的影响及发生机制。方法 选用成年雄性SD大鼠18只,采用随机数字表分为假手术组（SO组）、缺血再灌注组（IR组）及甜菜碱组（450 mg/kg灌胃）,每组6只大鼠。SO组：开胸,前降支动脉下穿线不结扎,IR组和甜菜碱组：开胸,缺血30 min,再灌注4 h。ELISA法检测并比较3组大鼠心肌损伤标记物乳酸脱氢酶（LDH）、肌酸激酶b（CK-Mb）和肌钙蛋白I（cTnI）和检测炎症因子（HMGB1、IL-17A、IL-6以及TNF-α）的表达。Western Blot法检测并比较3组大鼠心肌组织凋亡蛋白（caspase-3,Bcl-2和Bax）的相对表达量。结果 与SO组比较,IR组中心肌损伤标记物（CK、LDH和cTnI）、炎症因子和凋亡蛋白的表达均增高,差异均有统计学意义（P<0.05）。与IR比较,甜菜碱组心肌损伤标记物、炎症因子和凋亡蛋白的表达下降,抗凋亡蛋白Bcl-2的表达增加,差异有统计学意义（P<0.05）。结论 甜菜碱可以通过抑制炎症反应和心肌细胞凋亡减轻大鼠心肌IR损伤。     

Metabolic syndrome: pathogenesis, medical care and dental implications

BACKGROUND: The dental literature contains little information about metabolic syndrome (MetS) and its dental implications. TYPES OF STUDIES REVIEWED: The authors conducted a MEDLINE search for the period 2000 through 2005, using the term "metabolic syndrome" to define its pathophysiology, medical treatment and dental implications. RESULTS: MetS is the co-occurrence of abdominal obesity, hyper-triglyceridemia, reduced high-density lipoprotein cholesterol levels, hypertension and impaired fasting glucose, which results from consumption of a high-calorie diet and decreased levels of physical activity superimposed on the appropriate genetic setting. Components of MetS synergistically promote the development of atherosclerosis, resulting in myocardial infarction and stroke. CLINICAL IMPLICATIONS: Deteriorating oral health status is associated with worsening of the atherogenic profile. Tooth loss often results in chewing difficulties because of inadequate occlusive surfaces and may lead to alterations in food selection and dietary quality. This, in turn, adversely affects body composition and nutritional status, both of which are related to vascular health. Dentists should develop treatment plans that preserve and restore the dentition, thus ensuring maximum masticatory efficiency and affording patients the optimum opportunity to consume food that will not foster atherogenesis.     

胰岛素受体、p53在合并2型糖尿病乳腺癌患者肿瘤组织中的表达及临床研究

目的探讨胰岛素受体、p53肿瘤分子学指标在合并2型糖尿病乳腺癌患者肿瘤组织中的表达情况,并对其与2型糖尿病的关系及临床价值做出评判。方法合并2型糖尿病乳腺癌患者68例,对照非糖尿病乳腺癌组患者145例,取石蜡切片作胰岛素受体,p53指标的免疫组化检测。并分析比较两组指标的阳性率。结果在合并2型糖尿病组中,胰岛素受体阳性比例76.5%(52/68),阴性23.5%(16/68),对照组胰岛素受体阳性比例31.7%(46/145),阴性68.3%(99/145),二者在统计学上有差别(χ2=37.3,P<0.01)。在合并2型糖尿病组中,p53阳性比例66.2%(45/68),阴性33.8%(23/68),对照组p53阳性比例47.6%(69/145),阴性52.4%(76/145),二者在统计学上有差别(χ2=6.43,P<0.05)。结论在2型糖尿病合并乳腺癌患者肿瘤组织中胰岛素受体高表达,p53突变,预示患者不良预后,因加强随访及治疗。