Influence of chronic ADH treatment on adenylate cyclase and ATPase activity in distal nephron segments of diabetes insipidus Brattleboro rats

The medullary thick ascending limb (MAL), but not the medullary collecting tubule (MCT), has been shown to have an impaired adenylate cyclase (AC) responsiveness to ADH and a selective hypoplasia in Brattleboro diabetes insipidus (DI) rats. Since chronic ADH administration has been found to increase epithelium volume and basolateral membrane surface area in MAL but not in MCT, we investigated whether chronic ADH infusion would affect the hormone-sensitive AC and the Na–K-ATPase activity — two markers of the basolateral membrane — in single microdissected portions of thick ascending limb and collecting tubule in DI rats. Results indicate that 1. in MAL of ADH-treated rats, AC resposes to in vitro AVP and glucagon and Na–K-ATPase activity increased to the same extent as did epithelium volume (60–80%); 2. changes in the other segments were independent of any morphological alteration. In the cortical thick ascending limb, AVP and glucagonsensitive AC decreased by 30–40% whereas Na–K-ATPase activity did not change. In the collecting tubule, AC response to in vitro AVP was not altered by ADH-treatment but glucagon-sensitive AC dropped by 50% and Na–K-ATPase activity doubled, independently of any variation in plasma aldosterone and glucagon levels. These results show that, in the MAL, the ADH-induced variations in enzyme activity are a reflection of the enlargement of the basolateral membrane surface area. Further studies are needed to clarify the origin of enzymatic alterations in the other segments.     

广东地区散发克罗恩病患者β防御素2启动子区基因突变检测

目的:对广东地区散发克罗恩病患者β防御素2启动子区基因突变进行筛查,探讨该基因在克罗恩病发病中的作用。方法:克罗恩病组为2002-01/2006-10于南方医院消化科确诊的克罗恩病患者45例,对照组为门诊健康志愿者50例。签定知情同意书后分别取静脉血5mL,提取基因组DNA,并根据设计好的引物序列及PCR反应条件进行目的片段的扩增,阴性对照使用蒸馏水代替DNA。扩增成功的目的基因片段用DNA纯化试剂盒进行纯化,并由上海英俊公司完成测序工作。利用DNAMAN软件将患者测序结果与正常对照结果进行比对,并与基因库数据对照(http://www.ncbi.nlm.nih.gov/BLAST/),SPSS13.0进行统计学分析。并根据结果分析其与克罗恩病患者病变特点的相关性。结果:①纳入的45例克罗恩病患者与50例健康志愿者在性别和年龄上无统计学意义,并全部进入实验分析。②45例克罗恩病患者中有4例在β防御素2启动子区第-233(G→C)位发现基因突变,密码子由AGG变成AGC,编码氨基酸由精氨酸变成丝氨酸,而50例对照组未发现此改变,二者比较具有统计学意义(χ2=4.34,P<0.05)。③4例突变的患者病变均位于小肠(χ2=10.81,P<0.01)且病情较重。结论:在克罗恩患者中存在着β防御素2启动子区基因突变携带者,与患者发病年龄、病变部位、病变程度明显相关,有必要对其功能进行进一步探讨。     

用二维核磁共振技术研究野菊花三醇的结构

从野菊花(Chrysanthemum indicum L.)亲脂性极性较大的部分,分离得到一个新的倍半萜成分,命名为野菊花三醇。通过¹H-¹H COSY,¹H-¹³C COSY及远程¹H-¹³C COSY二维核磁共振谱研究,确定其属于(牛龙)牛儿烷衍生物,并确定其结构和相对立体构型。     

Proximal symphalangism and premature ovarian failure

Proximal symphalangism is a rare autosomal dominant affection responsible for multiple joint ankylosis, it results from NOG gene mutation whose locus is on 17q21-22. This gene may be involved in secretory functions of glands such as ovarian function. Premature ovarian failure is idiopathic in 80% of cases but may be secondary to multiple etiologies including genetic. We report the case of a patient with proximal symphalangism and premature ovarian failure, and we discuss the possibility of genetic relationship between the two anomalies.