LN和TN在正常子宫内膜与子宫内膜异位症异位内膜中的表达及意义

目的为了研究细胞外基质层粘连蛋白(LN)与肌腱蛋白(TN)在正常子宫内膜及子宫内膜异位症(内异症)异位内膜上的表达,探讨两者与内异症发生的关系。方法应用免疫组化方法分别检测正常子宫内膜及内异症异位内膜病理蜡块标本LN及TN表达水平。结果LN在内异症异位内膜和正常子宫内膜组织的基底膜及细胞外基质(ECM)中表达差异不显著;TN在内异症异位内膜和正常子宫内膜组织的腺上皮及ECM中表达差异有显著性。结论LN的表达与内异症的发生无关,不能作为内异症的一种预测指标。TN在内异症异位内膜及正常子宫内膜中的细胞外基质中表达差异显著,对内异症的发生可能起重要作用。     

慢性肝炎患者乙型肝炎病毒复制与肝纤维化标志物的关系

目的研究慢性乙型肝炎（下称乙肝）患者血清乙肝病毒（HBV）复制水平与肝纤维化血清标志物的关系。方法选择150例临床确诊为慢性乙肝的50例早期肝硬化患者，采用荧光定量聚合酶链反应（FQ-PCR）检测血清HBVDNA水平，放射免疫法和酶免疫法检测肝纤维化血清标志物（透明质酸、层黏连蛋白、Ⅲ型前胶原和Ⅳ型胶原），对血清HBVDNA水平与肝纤维化标志物的关系进行分析，并与100例无肝硬化患者血清HBVDNA及肝纤维化标志物水平进行比较。结果慢性乙肝患者血清HBVDNA水平与肝纤维化标志物的关系无统计学意义（P〉0．05），早期肝硬化患者血清肝纤维化标志物水平显著高于无肝硬化患者，但HBVDNA水平却低于无肝硬化患者（P〈0．05）。结论慢性乙肝患者血清HBVDNA水平与肝纤维化标志物水平无显著相关性。     

Surface topography during neural stem cell differentiation regulates cell migration and cell morphology

We sought to determine the contribution of scaffold topography to the migration and morphology of neural stem cells by mimicking anatomical features of scaffolds found in vivo. We mimicked two types of central nervous system scaffolds encountered by neural stem cells during development in vitro by constructing different diameter electrospun polycaprolactone (PCL) fiber mats, a substrate that we have shown to be topographically similar to brain scaffolds. We compared the effects of large fibers (made to mimic blood vessel topography) with those of small‐diameter fibers (made to mimic radial glial process topography) on the migration and differentiation of neural stem cells. Neural stem cells showed differential migratory and morphological reactions with laminin in different topographical contexts. We demonstrate, for the first time, that neural stem cell biological responses to laminin are dependent on topographical context. Large‐fiber topography without laminin prevented cell migration, which was partially reversed by treatment with rock inhibitor. Cell morphology complexity assayed by fractal dimension was inhibited in nocodazole‐ and cytochalasin‐D–treated neural precursor cells in large‐fiber topography, but was not changed in small‐fiber topography with these inhibitors. These data indicate that cell morphology has different requirements on cytoskeletal proteins dependent on the topographical environment encountered by the cell. We propose that the physical structure of distinct scaffolds induces unique signaling cascades that regulate migration and morphology in embryonic neural precursor cells. J. Comp. Neurol. 524:3485–3502, 2016. © 2016 Wiley Periodicals, Inc.     

健脾补土法对大鼠脑缺血再灌注后层黏连蛋白降解的影响

目的探讨健脾补土法对大鼠脑缺血再灌注后神经细胞周围层黏连蛋白(LN)的降解机制及其脑保护作用。方法 38只大鼠随机分为:假手术组8只,模型组10只,健脾补土传统汤剂组10只,健脾补土超微剂型组10只,大脑中动脉栓塞再通法建立脑缺血再灌注模型。进行神经功能症状评分,脑组织病理形态学观察,采用TUNEL法检测凋亡神经元,免疫组织化学法检测LN和基质金属蛋白酶9(MMP-9)阳性表达。结果与假手术组比较,模型组神经功能症状评分、细胞凋亡指数、MMP-9阳性细胞表达数明显升高,LN表达明显降低(P0.01)。与模型组比较,健脾补土传统汤剂组和健脾补土超微剂型组神经功能症状评分、细胞凋亡指数、MMP-9阳性细胞表达数明显降低,LN表达明显升高(P0.05,P0.01)。结论 LN降解在脑缺血再灌注损伤中起重要作用,健脾补土法可能通过抑制MMP-9和减少LN降解减轻缺血再灌注所致神经元损伤。     

Effect of mononuclear cells versus pioglitazone on streptozotocin-induced diabetic nephropathy in rats

BackgroundDiabetic nephropathy is a serious diabetic complication that leads to end stage renal disease. Cell therapies with human embryonic and specific adult stem cells have emerged as an alternative management for various diseases.MethodsTo test this hypothesis, the present study was conducted to compare effect of MNCs treatment (iv injection once in the tail vein for diabetic rats in a dose of 150 × 10⁶ MNCs cells/rat) versus pioglitazone (10 mg/kg, for eight weeks) on improving the renal structure and function changes and reducing laminin deposition associated with STZ-induced diabetic nephropathy in rats.ResultsTreatment with pioglitazone or MNCs, demonstrated a significant improvement in the STZ-induced renal functional and structural changes in comparison with diabetic control group. Additionally, our histopathological and immunohistochemical studies confirm these results. Meanwhile, MNCs treated group exhibited more improvement in all studied parameters as compared to pioglitazone treated group.ConclusionThese data indicate that MNCs treatment was superior to pioglitazone in controlling hyperglycemia, improving the renal structure and function changes and reducing renal laminin expression associated with STZ-induced diabetic nephropathy in rats.     

CD44v6,laminin在食管癌中的表达及分析

目的:探讨CD44v6及laminin在食管癌组织中的表达及其与食管癌细胞浸润与转移的关系.方法:采用免疫组化方法检测正常食管黏膜组织、良性病变和食管癌组织及癌旁组织中CD44v6和laminin的表达水平.结果:CD44v6在正常食管组织、良性病变及食管癌中的表达依次增高,laminin的表达依次减低(P<0.05);癌旁组织中CD44v6及laminin的表达与正常食管粘膜组织相比,存在统计学差异;食管癌组织中CD44v6及laminin的表达与组织学分级及淋巴结转移有关(P<0.05),而与临床分期无关;另外,CD44v6的表达与生存期也存在一定关系,CD44v6及laminin之间无明显相关关系.结论:CD44v6和laminin在食管癌的恶性转化和侵袭转移过程中可能起重要作用.     

β-连环蛋白和层粘连蛋白的表达与垂体腺瘤侵袭性的关系

目的探讨β-连环蛋白和层粘连蛋白(LN)在垂体腺瘤组织中的表达及其与垂体腺瘤侵袭性的关系。方法用免疫组化法检测55例垂体腺瘤(侵袭性垂体腺瘤24例,非侵袭性垂体腺瘤31例)组织中β-连环蛋白和LN的表达,分析两者的表达与垂体腺瘤侵袭性的关系。结果β-连环蛋白、LN在侵袭性垂体腺瘤组织中的表达均明显低于非侵袭性垂体腺瘤,差异有统计学意义(P<0.05)。β-连环蛋白与LN在垂体腺瘤组织中的表达呈正相关(r=0.281,P=0.038)。结论β-连环蛋白和LN均参与了垂体腺瘤的侵袭过程,可作为判断垂体腺瘤侵袭性的良好指标。     

Maturational changes in laminin, fibronectin, collagen IV, and perlecan in germinal matrix, cortex, and white matter and effect of betamethasone

Germinal matrix is selectively vulnerable to hemorrhage in premature infants, and use of prenatal betamethasone is associated with a lower occurrence of germinal matrix hemorrhage. Because the major components of extracellular matrix of the cerebral vasculature-laminin, fibronectin, collagen IV, and perlecan-provide structural stability to blood vessels, we examined whether the expression of these molecules was decreased in the germinal matrix and affected by betamethasone. In both human fetuses and premature infants, fibronectin was significantly lower in the germinal matrix than in the cortical mantle or white matter anlagen. Conversely, laminin alpha1 gene expression was greater in the human germinal matrix compared with the cortical mantle or white matter. Expression of alpha1- and alpha2(IV) collagen chains increased with advancing gestational age. Low-dose prenatal betamethasone treatment enhanced fibronectin level by 1.5-2-fold whereas a high dose reduced fibronectin expression by 2-fold in rabbit pups. Because fibronectin provides structural stability to the blood vessels, its reduced expression in the germinal matrix may contribute to the fragility of germinal matrix vasculature and the propensity to hemorrhage in premature neonates.