胰岛素样生长因子Ⅰ、胰岛素样生长因子Ⅰ受体在大肠癌中的表达及其意义

目的检测胰岛素样生长因子Ⅰ（IGF-Ⅰ）、胰岛素样生长因子Ⅰ受体（IGF-ⅠR）蛋白在大肠癌中的表达,并分析与临床病理学因素的关系．探讨两者在大肠癌发病机制中的相互作用及与患者预后的关系。方法选取不同类型的大肠癌组织48例（试验组）,其中男性25例,女性23例：年龄34～78岁,平均年龄53岁。任意选癌旁5cm以上的正常组织24例（正常对照组）。采用SABC法检测IGF-Ⅰ、IGF-ⅠR的表达。结果在48例大肠癌组织中,IGF-Ⅰ、IGF-ⅠR的阳性表达率分别为64．58％、58．33％,均显著高于癌旁正常组织中的16．67％、16．67％。IGF-Ⅰ、IGF-ⅠR在大肠癌组织中的表达与肿瘤的浸润程度、淋巴结转移、Dukes’分期有关。而与其他的病理因素及患者5年生存情况无关。IGF-Ⅰ和IGF-ⅠR在大肠癌组织中的表达呈明显相关性。结论IGF-Ⅰ、IGF-ⅠR可能相互协同作用参与大肠癌的浸润、转移,可作为反映大肠癌进展的重要生物学指标．但IGF-Ⅰ、IGF-ⅠR阳性表达与大肠癌患者的预后无明显相关性。     

胰岛素样生长因子-1在大鼠脑内的分布及禁食对其表达的影响

目的：观察大鼠脑内胰岛素样生长闪子-1（IGF-1）的分布,探讨禁食对大鼠脑IGF-1表达的影响。方法：大鼠分为对照组、禁食24h组和禁食72h组,SABC法免疫组织化学染色显示IGF-1免疫反应细胞。结果：IGF-1免疫反应细胞广泛分布于嗅球、大脑、小脑、下丘脑、中脑、延髓等部位。禁食组大鼠乳头体外侧核、嗅内皮质IGF-1表达水平减弱,海马下托和枕皮质IGF-1表达增强。禁食24h组和禁食72h组,脑内IGF-1表达无明显差异。结论：IGF-1在脑内广泛分布,禁食可改变某些脑区IGF-1的表达水平。     

丝胶对2型糖尿病大鼠睾丸生长激素/胰岛素样生长因子-1轴的作用

目的 探讨丝胶对2型糖尿病大鼠睾丸生长激素（GH）/胰岛素样生长因子-1（IGF-1）轴的作用。 方法 40只雄性SD大鼠随机分为正常对照组、糖尿病模型组、丝胶治疗组和阳性对照组,每组均为10只。链脲佐菌素连续腹腔注射制作2型糖尿病大鼠模型,1周后以血糖≥16.7mmol/L作为成模标准。待模型成功建立后,模型组大鼠不做任何处理,丝胶治疗组大鼠给予丝胶灌胃［2.4g/(kg•d)］,阳性对照组大鼠给予二甲双胍［55.33mg/(kg•d)］灌胃,均为35d。采用酶联免疫吸附测定（ELISA）方法检测大鼠血清睾酮、GH和IGF-1水平;分别采用免疫组织化学染色、免疫印迹法和RT-PCR法检测睾丸GH、GH受体（GHR）和IGF-1的表达。 结果 丝胶可明显降低糖尿病大鼠血GH水平、下调睾丸GH的表达,升高血IGF-1和睾酮水平,上调睾丸IGF-1和GHR的表达（P＜0.05,P＜0.01）。并且丝胶治疗组各项指标与阳性对照组比较无明显差别（P＞0.05）。 结论 丝胶可通过调节糖尿病时GH/IGF-1轴紊乱改善生精功能,发挥对糖尿病生殖功能损害的保护作用,其作用与二甲双胍相当。     

胰岛素样生长因子—1与一氧化氮在妊高征中的变化

目的研究妊高征患者血清中胰岛素样生长因子-1(IGF-1)与一氧化氮的变化及其相互关系.方法通过检测妊高征患者和正常妊娠妇女的血清胰岛素样生长因子-1与一氧化氮水平,分析两者在妊高征中的变化及相互关系.结果与正常妊娠妇女相比,妊高征患者血清胰岛素样生长因子-1与一氧化氮水平随病情加重而逐渐下降,且妊高征组胰岛素样生长因子-1与一氧化氮水平呈明显正相关(r=0.68P＜0.05),胰岛素样生长因子-1和一氧化氮与平均动脉压呈明显负相关(r=0.47P＜0.05),R=0.56P＜0.05).结论血清胰岛素样生长因子-1与一氧化氮水平异常可能参与了妊高征的发病过程.     

大鼠肝癌发生过程中胰岛素样生长因子-Ⅱ的表达及意义

目的:研究胰岛素样生长因子-Ⅱ(IGF-Ⅱ)在肝癌发生过程中的表达及意义.方法:采用二乙基亚硝胺(DEN)诱癌建立大鼠肝癌模型.应用放射免疫分析检测诱癌过程中血清IGF-Ⅱ浓度,应用免疫组织化学方法观察诱癌过程中大鼠肝组织IGF-Ⅱ的表达情况.结果:在大鼠肝癌的发生发展过程中,从肝细胞损伤期、增生-硬化期至癌变期3个阶段大鼠血清IGF-Ⅱ水平呈"高到低到高"的变化趋势;肝细胞损伤期嗜酸性变细胞中见IGF-Ⅱ阳性表达,癌变期癌灶中表达低于癌周增生灶、增生结节和非典型增生结节,而增生-硬化期阳性表达较少.结论:大鼠血清和肝中IGF-Ⅱ的高表达是肝癌发生发展过程中的早期及晚期事件,提示IGF-Ⅱ可能与肝细胞持续增殖及恶性转化有关.     

生长激素和胰岛素样生长因子1在Lewis侏儒模型大鼠颞叶皮质中的表达

BACKGROUND:Insulin-like growth factor-1(IGF-1), a main active factor in growth hormone (GH), plays various biological functions, such as improving cognitive ability and anti-apoptotic action. OBJECTIVE:To detect the expressions of GH and IGF-1 in the temporal cortex of Lewis dwarf rats, and to explore the effect of different concentrations of GH on the differentiation of hippocampal nerve stem cells (NSCs). METHODS:Lewis dwarf rats aged 11(adult) and 20 (senile) month olds and normal wild-type rats were euthanized by decapitation, underwent the craniotomy quickly, and the temporal cortex in the cold saline was extracted. GH and IGF-1 levels were detected using western blotting. After isolation, purification and identification of the rat hippocampal NSCs, the effect of GH in different concentrations (10, 30, 90 μg/L) on the NSCs differentiation was determined at 96 hours after culture. RESULTS AND CONCLUSION:The GH level in the temporal cortex did not differ significantly among rats (P > 0.05). While the IGF-I level in the temporal cortex of Lewis dwarf rats was significantly higher than that of the wild-type rats (P < 0.05). The GH level in the temporal cortex of adult female Lewis dwarf rats was significantly lower than that of the male rats (P < 0.05). Immunofluorescence showed that the proportion of β III-tubulin-positive neurons was significantly higher than that in the control group (P < 0.05) after the hippocampal NSCs and precursor cells cultured for 96 hours with GH (30 μg/L), but there was no significant difference between the control group and treatment group with GH of 10 or 90 μg/L. These results suggest that GH and IGF-I are expressed in the temporal cortex of both Lewis dwarf and wild-type rats which are independent from pituitary GH and the peripheral circulating IGF-1. Additionally, GH can promote the differentiation of hippocampal NSCs and precursor cells into neurons. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

大鼠大脑中动脉闭塞后脑内胰岛素样生长因子-Ⅱ的表达

目的 探讨大脑中动脉闭塞(MCAO)后早期胰岛素样生长因子-Ⅱ(IGF-Ⅱ)在脑内的表达.方法 应用免疫组化方法检测SD大鼠MCAO后IGF-Ⅱ的表达.结果 免疫组化方法结果显示MCAO后再灌注12、24 h和72 h时,与假手术组相比,缺血侧大脑皮质IGF-Ⅱ免疫反应阳性细胞数表达均降低(12 h与24 h时P＜0.05,72 h时P＜0.01).结论 MCAO后早期缺血侧大脑皮质IGF-Ⅱ呈低水平表达,提示IGF-Ⅱ可能在脑缺血损伤中发挥一定作用.     

胰岛素样生长因子与糖尿病神经病变

胰岛素样生长因子（ＩＧＦｓ）是一种具有胰岛素样作用的生长因子,它具有促进神经生长和修复作用。在有糖尿病神经病变的患者或鼠,ＩＧＦ的水平及作用减低。糖尿病早期,神经组织中的ＩＧＦ的基因表达减少。补充ＩＧＦ能改善甚至逆转糖尿病神经病变、提高神经传导速度。但ＩＧＦ的治疗具有一定的副作用,剂量较大时较为明显。     

胰岛素样生长因子轴与肝癌

胰岛素样生长因子轴的失调在肝癌的发生发展过程中发挥重要作用 ,它包括胰岛素样生长因子 (In sulin likegrowthfactors ,IGFs)、IGF受体、胰岛素样生长因子结合蛋白 (IGFbindingproteins,IGFBPs)和IGFBP蛋白水解酶。肝癌组织中IGF Ⅱ表达增加 ,IGF Ⅰ表达下降。IGFBP降解增加 ,进一步促进了IGFs的生物利用度。同时 ,IGFBP 3可不依赖IGFs而抑制肝癌的发生。     

Early-activated microglia play a role in transient forebrain ischemia-induced neural precursor proliferation in the dentate gyrus of mice

Although it has been well established that ischemic insults promote cell proliferation in the subgranular zone (SGZ) of the hippocampal dentate gyrus (DG), the mechanisms by which this occurs remain unclear. The present study demonstrates that early-activated microglia in the hilus of the DG play an important role in ischemia-induced cell proliferation. Transient forebrain ischemia induced by 20 min of bilateral common carotid artery occlusion (BCCAO) significantly increased cell proliferation in the SGZ of the DG beginning 4 days post-reperfusion. Moreover, BCCAO increased microglial activation in the hilus of the DG from 1 day post-reperfusion and in the CA1 layer from 4 days post-reperfusion. An injection of minocycline (10 or 100 nmol in 0.5 μl) into the DG immediately after reperfusion decreased microglial activation in the hilus of the DG 1 day post-reperfusion, but only a high dose of minocycline (100 nmol) significantly decreased microglial activation in the CA1 layer. Both high and low doses of minocycline significantly decreased the number of BrdU-positive cells at 7 days post-reperfusion. These results suggest that early-activated microglia in the hilus of the DG take part in the cell proliferation induced by transient forebrain ischemia.     

大鼠局灶性短暂脑缺血后前脑室下带的神经发生

目的：观察大鼠短暂性局灶性脑缺血后前脑室下带(SVZ)神经发生的增殖规律。方法：将SD大鼠随机分为正常对照组、假手术组和缺血实验组,缺血实验组再分为缺血后1、4、7、10、14d组。线栓法制作局灶性脑缺血模型;BrdU标记S期细胞并用免疫组织化学方法检测含BrdU的阳性细胞;测量SVZ区域BrdU阳性细胞核的总面积。结果：在缺血侧,缺血后4d BrdU阳性细胞核的总面积明显增加,7d时达到峰值,随后开始下降,在14d时明显下降,但仍高于正常对照组;在缺血对侧,该区域也表现出同样的表达规律,在缺血后10d达到峰值,但增幅较小。结论：短暂性局灶性脑缺血可促进前脑室下带的神经发生,提示成年脑有潜在的自我修复能力。     

IGF-I和IGF-IR在高氧致新生鼠慢性肺疾病中的动态表达及其作用

目的研究IGF-I、IGF-IR在高氧致新生鼠慢性肺疾病（CLD）中的表达及作用。方法将足月新生大鼠144只随机分为高氧组和空气组,分别于实验1d,3d,7d,10d,14d,21d应用免疫组化和RT-PCR技术检测IGF-I、IGF-IR的动态表达。结果CLD时IGF-I和IGF-IR呈动态变化,高氧组和空气组比较,在实验3d～10d IGF-I和IGF-IR表达明显降低（P〈0.05）,14d和21d表达明显增强（P〈0.05）。结论IGF-I和IGF-IR是肺泡发育的正向调节因子,与CLD时肺泡分隔受阻、肺泡成熟障碍和肺纤维化有关。     

高压氧治疗新生儿缺血缺氧脑病机制的研究

目的探讨高压氧干预新生儿缺血缺氧脑病（hypoxic-inchemic encephalopathy,HIE）的机制。方法选取40例患缺血缺氧脑病的新生儿,随机分成实验组和对照组各20例,对实验组进行高压氧、视、触、听觉和前庭功能早期干预,对照组只进行视、触、听觉和前庭功能训练,对两组新生儿进行生长激素（growth hormone,GH）和胰岛素样生长因子-Ⅰ（Insulin-like growth factor,IGF-Ⅰ）检测。结果 GH、IGF-1在实验组随着月龄的增长明显升高,在对照组也随着月龄的增长而升高,但增长幅度明显小于实验组。结论高压氧早期干预有利于缺血缺氧脑病患儿生长发育。     

Insulin-like growth factor-1 overexpression in cardiomyocytes diminishes ex vivo heart functional recovery after acute ischemia

Background

Acute insulin-like growth factor-1 administration has been shown to have beneficial effects in cardiac pathological conditions. The aim of the present study was to assess the structural and ex vivo functional impacts of long-term cardiomyocyte-specific insulin-like growth factor-1 overexpression in hearts of transgenic αMHC-IGF-1 Ea mice.

Methods

Performance of isolated transgenic αMHC-IGF-1 Ea and littermate wild-type control hearts was compared under baseline conditions and in response to 20-min ischemic insult. Cardiac desmin and laminin expression patterns were determined histologically, and myocardial hydroxyproline was measured to assess collagen content.

Results

Overexpression of insulin-like growth factor-1 did not modify expression patterns of desmin or laminin but was associated with a pronounced increase (∼30%) in cardiac collagen content (from ∼3.7 to 4.8 μg/mg). Baseline myocardial contractile function and coronary flow were unaltered by insulin-like growth factor-1 overexpression. In contrast to prior evidence of acute cardiac protection, insulin-like growth factor-1 overexpression was associated with significant impairment of acute functional response to ischemia-reperfusion. Insulin-like growth factor-1 overexpression did not modify ischemic contracture development, but postischemic diastolic dysfunction was aggravated (51±5 vs. 22±6 mmHg in nontransgenic littermates). Compared with wild-type control, recovery of pressure development and relaxation indices relative to baseline performance were significantly reduced in transgenic αMHC-IGF-1 Ea after 60-min reperfusion (34±7% vs. 62±7% recovery of +dP/dt; 35±11% vs. 57±8% recovery of −dP/dt).

Conclusions

Chronic insulin-like growth factor-1 overexpression is associated with reduced functional recovery after acute ischemic insult. Collagen deposition is elevated in transgenic αMHC-IGF-1 Ea hearts, but there is no change in expression of the myocardial structural proteins desmin and laminin. These findings suggest that sustained cardiac elevation of insulin-like growth factor-1 may not be beneficial in the setting of an acute ischemic insult.     

Inhibitor of vascular endothelial growth factor receptor tyrosine kinase attenuates cellular proliferation and differentiation to mature neurons in the hippocampal dentate gyrus after transient forebrain ischemia in the adult rat

Neurogenesis in the adult hippocampal dentate gyrus is promoted by transient forebrain ischemia. The mechanism responsible for this ischemia-induced neurogenesis, however, remains to be determined. It has been suggested that there may be a close relationship between neurogenesis and the expression of vascular endothelial growth factor, an angiogenic factor. The purpose of the present study was to examine the relationship between vascular endothelial growth factor and cell proliferation in the dentate gyrus after transient forebrain ischemia. The mRNA expression of vascular endothelial growth factor was increased in the dentate gyrus on day 1 after ischemia. Immunohistochemical analysis on day 9 after ischemia, when a significant increase in cell proliferation was seen, showed that the cerebral vessel space in the subgranular zone of the dentate gyrus had not been affected by the ischemia. Neither were the vascular densities on days 1 and 3 after ischemia altered compared with those of non-operated naïve control rats. Furthermore, the distance from the center of the proliferative cells to the nearest cerebral vessel of ischemic rats was comparable to that of the sham-operated rats. We demonstrated that transient forebrain ischemia-induced cell proliferation and differentiation to mature neurons in the hippocampal dentate gyrus was attenuated by the i.c.v. administration of a vascular endothelial growth factor receptor tyrosine kinase inhibitor. These results suggest that vascular endothelial growth factor receptor at the early period of reperfusion may contribute to neurogenesis rather than to angiogenesis in the hippocampal dentate gyrus.     

胰岛素样生长因子I通过改善线粒体功能保护新生大鼠心肌细胞免于凋亡

 目的：探讨线粒体机制在胰岛素样生长因I(IGF-I)保护心肌细胞中的作用。方法：体外培养新生大鼠心肌细胞,过氧化氢处理诱导凋亡,JC-1线粒体膜电位检测法和透射电镜观察心肌细胞线粒体膜电位和形态的改变,Annexin V-FITC/PI双染色法、caspase-3活性测定、DNA-ladder分析和Hoechst 33258染色方法观察心肌细胞凋亡的情况。结果：过氧化氢可诱导心肌细胞凋亡,siRNA下调Kruppel 样因子9（KLF9）48 h后,心肌细胞线粒体膜电位下降率明显降低,由对照组的(24.0±1.6)%,降为IGF-I处理组的(18.3±1.2)%和KLF9下调组的(15.2±1.2)%;线粒体形态明显改善;DNA片段化改善;caspase-3活性降低,与对照组相比IGF-I处理组降低(1.30±0.28)倍,KLF9下调组降低(1.31±0.43)倍;Annexin V-FITC/PI双染法显示细胞凋亡率对照组为（42.5±1.8）%,IGF-I处理组为（22.4±4.2）%,KLF9下调组为（32.5±3.5）%;Hoechst 33258染色结果显示凋亡小体减少,KLF9下调组与IGF-I的抗心肌细胞凋亡效果相似。结论：IGF-I通过下调KLF9表达改善线粒体功能,保护心肌细胞免于凋亡。     

宫内发育迟缓大鼠血清胰岛素样生长因子Ⅰ、Ⅱ、BP3的变化及L-精氨酸的保护作用

目的通过L-精氨酸孕期干预后大鼠血清胰岛素样生长因子-Ⅰ、Ⅱ及结合蛋白3水平的变化,探讨L-精氨酸的保护作用及其机制。方法采用被动吸烟法造大鼠IUGR模型,孕鼠随机分为4组:对照组、模型组、L-精氨酸小剂量和大剂量防治组,每组9只。孕21d剖宫取胎,测量胎鼠体重。应用酶联免疫吸附法检测各组大鼠血清IGF-Ⅰ、IGF-Ⅱ及IG-FBP-3水平。结果对照组、模型组与小、大剂量L-精氨酸防治组IUGR发生率分别为3.92%,54.95%,5.55%和9.09%。模型组大鼠血清IGF-Ⅰ、IGF-Ⅱ水平较对照组明显降低(P<0.01),小剂量和大剂量L-精氨酸防治组与模型组相比,IGF-Ⅰ、IGF-Ⅱ水平明显增高(P<0.01)。模型组大鼠血清IGFBP-3水平较对照组明显增高(P<0.01),小剂量和大剂量L-精氨酸防治组与模型组相比,IGFBP-3水平明显降低(P<0.01),与对照组亦有明显差异(P<0.01)。结论L-精氨酸可增高被动吸烟致宫内发育迟缓大鼠血清胰岛素样生长因子-Ⅰ、Ⅱ的水平,降低胰岛素样生长因子结合蛋白3的水平,从而促进胎鼠发育,防治IUGR的发生。     

Increase of basic fibroblast growth factor immunoreactivity and its mRNA level in rat brain following transient forebrain ischemia

Summary We examined the time course of basic fibroblast growth factor (bFGF) immunoreactivity and its mRNA level mainly in the hippocampus after transient forebrain ischemia using immunohistochemistry, enzyme immunoassay (EIA), Western blot analysis and in situ hybridization. Neuronal death in the hippocampal CA1 subfield was observed 72 h after 20 min of ischemia. The number of bFGF-immunoreactive(IR) cells increased 48 h–5 days after ischemia in all hippocampal regions. At 10 and 30 days, the bFGF-IR cells in the CA1 subfield had further increased in numbers and altered their morphology, enlarging and turning into typical reactive astrocytes with the advancing neuronal death in that area. In contrast, the number of bFGF-IR cells in other hippocampal regions had decreased 30 days after ischemia. The EIA study showed a drastic increase in bFGF levels in the hippocampus 48 h after ischemia (150% of that in normal rat) which was followed by further increases. In Western blot analysis, three immunoreactive bands whose molecular weights correspond to 18, 22 and 24 kDa were observed in normal rat and ischemia increased all their immunoreactivities. In the in situ hybridization study of the hippocampus, bFGF mRNA positive cells were observed in the CA1 subfield in which many bFGF-IR cells existed after ischemia. These data demonstrate that transient forebrain ischemia leads to an early and strong induction of bFGF synthesis in astrocytes, suggesting that the role of bFGF is related to the function of the reactive astrocytes which appear following brain injury.