Changes of adiponectin and its receptors in rats following chronic renal failure

Objective: To investigate changes of adiponectin and its receptors (Adipo R) in rats following chronic renal failure. Methods: Male SD rats were randomly divided into two groups: control group and chronic renal failure (CRF) group. The CRF group were gavaged with adenine (300?mg/kg/d) for 4 weeks and the control group with drinking water. All rats were anesthetized at 2nd or 4th week and blood and urine samples were collected for detection of renal function, 24?h urine protein and adiponectin concentration. Renal tissues were also collected for HE staining, immunohistochemistry and RT-PCR screening. Results: Compared with control group, the serum concentrations of urea and creatinine, 24?h urine protein excretion in the CRF group were significantly higher at 2nd week and further increased at 4th week (p?0.05). The adiponectin levels in serum and urine in the CRF group were significantly higher than those of control group (p?0.01). The renal expressions of Adipo R1 and Adipo R2 in CRF group were also significantly increased compared to control group (p?0.01). The increased expressions of Adipo R1 and Adipo R2 were positively related to the adiponectin levels in serum, urine, and 24?h urine protein. Conclusion: The significant changes in expression of adiponectin and its receptors in rat CRF model could be an adaptive response that may provide the basis to understand pathological changes in chronic kidney disease.     

Soy β-conglycinin improves glucose uptake in skeletal muscle and ameliorates hepatic insulin resistance in Goto-Kakizaki rats

Although the underlying mechanism is unclear, β-conglycinin (βCG), the major component of soy proteins, regulates blood glucose levels. Here, we hypothesized that consumption of βCG would normalize blood glucose levels by ameliorating insulin resistance and stimulating glucose uptake in skeletal muscles. To test our hypothesis, we investigated the antidiabetic action of βCG in spontaneously diabetic Goto-Kakizaki (GK) rats. Our results revealed that plasma adiponectin levels and adiponectin receptor 1 messenger RNA expression in skeletal muscle were higher in βCG-fed rats than in casein-fed rats. Phosphorylation of adenosine monophosphate–activated protein kinase (AMP kinase) but not phosphatidylinositol-3 kinase was activated in βCG-fed GK rats. Subsequently, βCG increased translocation of glucose transporter 4 to the plasma membrane. Unlike the results in skeletal muscle, the increase in adiponectin receptor 1 did not lead to AMP kinase activation in the liver of βCG-fed rats. The down-regulation of sterol regulatory element-binding factor 1, which is induced by low insulin levels, promoted the increase in hepatic insulin receptor substrate 2 expression. Based on these findings, we concluded that consumption of soy βCG improves glucose uptake in skeletal muscle via AMP kinase activation and ameliorates hepatic insulin resistance and that these actions may help normalize blood glucose levels in GK rats.     

缺氧缺血性脑病新生儿脂联素、胰岛素样生长因子-1的变化

目的探讨缺氧缺血性脑病(HIE)新生儿血清胰岛素样生长因子-1(IGF-1)、脂联素(APN)水平的变化。方法选择足月HIE新生儿52例(重度HIE组15例,中度HIE组20例,轻度HIE组17例),测定脐血及生后3~5 d(HIE急性期)、10~14 d(HIE恢复期)的血清IGF-1、APN水平;另选同期出生的20例足月健康新生儿作为对照组。结果轻、中、重度HIE组及对照组四组间脐血及生后3~5 d时APN、IGF-1水平的差异有统计学意义(P均0.01),均随HIE程度加重而下降,两两比较差异有统计学意义(P均0.05);HIE恢复期新生儿APN、IGF-1水平显著增加,但APN水平中度HIE组和重度HIE组仍低于对照组,差异有统计学意义(P均0.05);重度HIE组IGF-1仍低于对照组,差异有统计学意义(P0.05);HIE患儿脐血、急性期血清IGF-1、APN水平呈显著正相关(r=0.53、0.61,P均0.01)。结论 HIE患儿血清IGF-1、APN水平降低与HIE的病理生理过程密切相关,可作为病情程度的判断指标之一,对临床诊断及预后的判断具有指导意义。     

重组腺病毒Ad-APN-EGFP的构建与促进种植体周围成骨

目的 构建重组腺病毒Ad-APN-EGFP,研究其转染效率和对种植体周围成骨的影响。方法 构建含脂联素（APN）基因的的重组腺病毒Ad-APN-EGFP,并测序鉴定和酶切鉴定。体外转染大鼠骨髓间充质干细胞（BMSCs）,检测转染效率和APN基因mRNA表达;建立大鼠股骨干骺端羟磷灰石涂层种植体植入动物模型。植入种植体前,实验组于植入体窝注入10 μL的Ad-APN-EGFP悬浮液;对照组注入10 μL的PBS。4周后取材,光镜下观察种植体周围成骨。结果 测序鉴定和酶切鉴定表明,成功构建重组腺病毒Ad-APN-EGFP;转染大鼠BMSCs效率可达90%以上,并能高表达APN基因mRNA;体内实验显示实验组种植体周围成骨明显高于对照组。结论 重组腺病毒Ad-APN-EGFP可以提高大鼠BMSCs的APN基因表达,具有促进种植体周围成骨的作用。     

人脂联素球状域-胰升糖素样肽-1类似肽融合蛋白表达载体的构建

目的获得含人脂联素球状域-胰升糖素样肽-1类似肽融合蛋白的表达载体。方法构建含人脂联素球状域-胰升糖素样肽-1类似肽融合基因的原核表达载体,其中人脂联素球状域-胰升糖素样肽-1类似肽融合基因由接头序列连接而成,该接头序列编码产物为富含甘氨酸的短肽。结果通过基因的扩增、重组等构建了人脂联素球状域-胰升糖素样肽-1类似肽融合基因的原核表达载体。结论获得了人脂联素球状域-胰升糖素样肽-1类似肽融合蛋白的原核表达载体,为进一步进行脂联素球状域-胰升糖素样肽-1类似肽融合蛋白的表达及纯化,建立表达具有生物活性的脂联素球状域-胰升糖素样肽-1类似肽融合蛋白的方法,提供前期研究。     

食管腺癌患者血清中脂联素与炎症细胞因子水平的相关性探讨

目的:探讨食管腺癌（esophageal adenocarcinoma,EAC）患者血清中脂联素与炎症细胞因子水平及肿瘤组织病理特点之间的相关性,分析脂联素是否通过调节食管组织炎症而参与抑制肿瘤的进展。方法:收集25例健康人、23例Barrett食管（Barrett's esophagus,BE）患者和18例EAC患者。登记临床病例资料;采集空腹静脉血,采用ELISA法检测血清中脂联素和TNF-α、IL-8、IL-6水平并分析其相关性;进行HE染色观察食管组织局部炎症情况。结果:健康对照组、BE组、EAC组三组间相比较发现,随着食管病变的加重,食管局部炎症细胞浸润越明显,同时检测到血清中TNF-α、IL-8、IL-6水平逐渐升高,相反血清脂联素水平逐渐降低;相关性分析结果显示血清炎症细胞因子水平与脂联素水平间存在着负相关关系。结论:EAC发病过程中,食管局部炎症反应逐渐加重,血清炎症细胞因子水平逐渐升高,而脂联素水平逐渐降低,两者之间存在着明显的负相关关系。由此可知,低脂联素血症可能与EAC发生和进展过程中持续存在的慢性炎症有关。     

代谢综合征患者血清脂联素浓度与血脂的相关性研究

目的: 探讨代谢综合征患者血清脂联素水平与血脂的关系.方法: 选取代谢综合征患者35例,另选健康对照组20例,常规测量身高、体重,所有实验对象空腹采血离心取血清测定脂联素、甘油三酯(TG)、胆固醇、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C).结果: 与对照组相比,代谢综合征组血清脂联素水平显著降低(P<0.01),血清TG、CHOL、HDL-C、LDL-C、BMI、显著升高(P<0.01).Pearson相关性分析显示,在代谢综合征组中血清脂联素与TG、CHOL、LDL-C、BMI、年龄呈负相关,与HDL-C呈正相关(P<0.05).结论: 低血清脂联素水平与脂类代谢紊乱密切相关.