Identification of up-regulated genes in human uterine leiomyoma by suppression subtractive hybridization

In searching for differentially expressed genes in human uterine leiomyomas (ULs), suppression sub-tractive hybridization was used to construct an UL up-regulated library, which turned out to represent 88genes. After two rounds of screening by reverse Northern analysis, twenty genes were proved to be up-regulated, including seventeen known genes and three genes with unknown function. All these genes werefirstly associated with UL. Three genes with notable difference were selected for Northern confirmationOur results proved the authenticity of the twenty genes. One gene named Phospholipase A2 (PLA2) showedup-regulation in 4/6 of the patients and investigation of tissue distribution indicated that it had obviousexpression in prostate, testis, liver, heart and skeletal muscle.     

Angiotensin II Receptor Blocker Attenuates Intrarenal Renin-Angiotensin-System and Podocyte Injury in Rats with Myocardial Infarction

The mechanisms and mediators underlying common renal impairment after myocardial infarction (MI) are still poorly understood. The present study aimed to test the hypothesis that angiotensin II type 1 receptor blockers (ARBs) provides renoprotective effects after MI by preventing augmented intrarenal renin-angiotensin-system (RAS)-induced podocyte injury. Sprague–Dawley rats that underwent ligation of their coronary arteries were treated with losartan (20 mg/kg/d) or vehicle for 3 or 9 weeks. Renal function, histology and molecular changes were assessed. The current study revealed that MI-induced glomerular podocyte injury was identified by increased immunostaining for desmin and p16^ink4a, decreased immunostaining for Wilms’ tumor-1 and podocin mRNA expression, and an induced increase of blood cystatin C at both 3 and 9 weeks. These changes were associated with increased intrarenal angiotensin II levels and enhanced expressions of angiotensinogen mRNA and angiotensin II receptor mRNA and protein. These changes were also associated with decreased levels of insulin-like growth factor (IGF-1) and decreased expressions of IGF-1 receptor (IGF-1R) protein and mRNA and phosphorylated(p)-Akt protein at 9 weeks, as well as increased expressions of 8-hydroxy-2’-deoxyguanosine at both time points. Treatment with losartan significantly attenuated desmin- and p16^ink4a-positive podocytes, restored podocin mRNA expression, and decreased blood cystatin C levels. Losartan also prevented RAS activation and oxidative stress and restored the IGF-1/IGF-1R/Akt pathway. In conclusion, ARBs prevent the progression of renal impairment after MI via podocyte protection, partially by inhibiting the activation of the local RAS with subsequent enhanced oxidative stress and an inhibited IGF-1/IGF-1R/Akt pathway.     

土壤含水量对桔小实蝇蛹期存活的影响

浸水时间、土壤含水量对桔小实蝇Bactroceradorsalis(Hendel)蛹的存活及成虫羽化的影响的研究结果表明:(1)不同浸水时间对桔小实蝇蛹存活率的影响不同。浸水时间越长,蛹存活率越低;浸水对初期蛹的影响较大,蛹龄越大,浸水作用效果越低。浸水时间(TW)、蛹期(AP)和蛹存活率(SP)之间关系符合以下模型:SP=0.4165-0.00307TW+0.2290AP-0.00004496T2W-0.0002528A2P+0.00008258TWAP。(2)土壤含水量对桔小实蝇成虫羽化影响明显。当土壤含水量较低或较高时,羽化率都明显受到抑制。相对含水量在30%～80%之间,蛹的羽化率较高。相对含水量(Ws)和成虫羽化率(E)之间存在以下关系:E=0.396+0.01985W-0.000181W2。     

土壤微生物量测定方法概述

土壤微生物量是土壤生态系统研究的重要参数之一。常用的土壤微生物量的测定方法主要包括:直接镜检法、熏蒸系列方法、底物诱导系列方法、成分分析法和比色法。对这些具体测定方法、原理及其优缺点进行了简要的评述,并指出了应用这些方法须注意的问题和今后的研究方向。     

冻干胡蜂蜂蛹对果蝇寿命和繁殖性能的影响

本实验通过研究胡蜂蜂蛹冻干品对果蝇寿命和繁殖力的影响,证明胡蜂蜂蛹具有延缓衰老和增强繁殖性能的作用。采用乙醚麻醉法,收集8h（小时）内羽化的成虫,选择个体大小相近的雌雄果蝇,在不同浓度的培养基中饲养,每两天观察统计一次果蝇死亡数,直到全部死亡。结果表明,雌雄果蝇在5．0％实验组与对照组的平均寿命比较均具有极显著差异性（P〈0．01）,雌雄果蝇在0．2％和1．0％实验组与对照组比较平均寿命差异性显著（P〈0．05）,由此可见胡蜂蜂蛹可延长果蝇平均寿命;0．2％,1．0％组的果蝇子代数显著高于对照组果蝇子代数（P〈0．05）,5．0％组果蝇子代数极显著高于对照组果蝇子代数（P〈0．01）,由此可见冻干胡蜂蜂蛹可增强果蝇的繁殖能力。     

五唇兰大孢子发生的超微结构观察

五唇兰(Doritis pulcherrima Lind l．)大孢子母细胞在减数分裂前呈长圆形,细胞核偏向珠孔端,细胞呈现极性分化。大孢子母细胞第一次减数分裂形成二分体。随后,二分体珠孔端的一个细胞退化,合点端的一个细胞体积增大成为功能大孢子。功能大孢子进行第二次减数分裂,形成二核胚囊。这一过程属于双孢子葱型胚囊的大孢子发生类型。珠孔端的二分体细胞(大孢子)在退化过程中质膜保持完好,液泡数量增多,染色质高度凝集,具有细胞程序死亡的部分特征。功能大孢子的细胞器和染色质分布均匀。功能大孢子合点端的细胞壁上有发达的胞间连丝,二核胚囊期胞间连丝消失。在功能大孢子靠近合点端一侧有吞噬结构,其内含有结构模糊的细胞器     

中国西藏大叶蝉亚科二新种(半翅目:叶蝉科)

记述采自中国西藏的叶蝉科大叶蝉亚科窗翅叶蝉属Mileewa Distant 1新种——易贡窗翅叶蝉Mileewa yigongana Yang,sp．nov．和斑大叶蝉属Anatkina Young 1新种——多色斑大叶蝉Anatkina polycolora Yang,sp．nov．。模式标本保存在中国农业大学昆虫学系。     

印楝油对印楝素的增效作用和保护作用

印楝油对印楝素具有增效作用,印楝素A和印楝种子石油醚抽提物和印楝种子植物油分别按1：10(m／m)混用处理斜纹夜蛾3龄幼虫,共毒系数分别为150．17和226．87,印楝素B和两者混用后的共毒系数分别为166．00和242．18。印楝种子植物油对印楝素具有保护作用,在54℃下热贮7d,印楝油(甲醇：印楝油=9-1,v／v)对印楝素A和印楝素B的保护效果分别为56．96％和50．86％;热贮14d,保护效果分别为26．72％和38．42％。     

KAI1/CD82 在早孕小鼠子宫内膜组织的表达研究

目的：观察KAI1／CD82 mRNA和蛋白在小鼠妊娠D1-D8子宫内膜组织的表达。方法：以胚胎与肿瘤同源性为理论基础,胚胎植入与肿瘤侵袭转移相似为切入点,采用免疫组化和RT-PCR技术。结果：KAI1／CD82 mRNA和蛋白在早孕子宫中,KAI1／CD82mRNA的表达渐增多,蛋白表达的量和范围也渐增强。结论：KAI1／CD82mRNA和蛋白在早孕子宫组织中的动态表达,提示它在胚胎精确侵袭子宫内膜的调节中发挥作用,是滋养层细胞精确侵袭调控的分子机制之一。