Autocrine Role of Insulin‐like Growth Factor II Secretion by the Rat Choroid Plexus

Autocrine Role of Insulin‐like Growth Factor II Secretion by the Rat Choroid Plexus
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大鼠脉络丛分泌胰岛素样生长因子 II 的自分泌作用

DOI:
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发表时间:
1996
影响因子:
3.4
通讯作者:
S. Gammeltoft
S. Gammeltoft
中科院分区:
医学3区
文献类型:
--
作者:
C. Nilsson;B. M. Hultberg;S. Gammeltoft

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胰岛素样生长因子II(IGF-II)由脉络丛表达和分泌,并被认为是成年哺乳动物中枢神经系统中的营养因子。本研究的目的是研究IGF-II是否在脉络丛中具有自分泌作用。使用原位杂交,我们证明,IGF-II主要表达在成年大鼠脉络丛的上皮细胞。在IGF-II放射受体测定中,来自纯化大鼠脉络丛上皮细胞、完整脉络丛组织以及大鼠CSF的原代培养物的条件培养基取代了IGF-II与23 HMM黑色素瘤细胞系的结合。通过Western免疫印迹显示条件培养基中IGF-II和IGF结合蛋白-2的存在。脉络丛上皮细胞培养物中的有丝分裂活性通过掺入细胞核的溴脱氧尿苷的免疫组织化学染色来定量。针对IGF-II的单克隆抗体抑制了35%的细胞分裂,而IGF-I使染色的细胞核数量增加了75%。碱性成纤维细胞生长因子在低浓度下刺激细胞分裂,但在高浓度下没有效果。生长激素没有影响。我们得出结论,脉络丛中的IGF-II可能在脉络丛上皮细胞生长的调节中具有自分泌作用。
Insulin‐like growth factor II (IGF‐II) is expressed and secreted by the choroid plexus and has been suggested to act as a trophic factor in the adult mammalian central nervous system. The aim of the present study was to investigate whether IGF‐II has an autocrine role in the choroid plexus. Using in situ hybridization we demonstrate that IGF‐II is primarily expressed in the epithelium of adult rat choroid plexus. Conditioned medium from primary cultures of purified rat choroid plexus epithelial cells, intact choroid plexus tissue, as well as rat CSF, displaced IGF‐II binding to a 23 HMM melanoma cell line in an IGF‐II radioreceptor assay. The presence of IGF‐II and IGF binding protein‐2 in conditioned medium was shown by Western immunoblot. The mitotic activity in choroid plexus epithelial cell cultures was quantified by immunohistochemical staining of bromodeoxyuridine incorporated into cell nuclei. A monoclonal antibody towards IGF‐II inhibited cell division by 35%, while IGF‐I increased the number of stained nuclei by 75%. Basic fibroblast growth factor stimulated cell division at low concentrations, but had no effect at high concentrations. Growth hormone had no effect. We conclude that IGF‐II in the choroid plexus could have an autocrine role in the regulation of choroid plexus epithelial cell growth.
II 型胰岛素样生长因子受体不介导人成纤维细胞中的脱氧核糖核酸合成。
DOI: 10.1210/jcem-64-6-1142
发表时间: 1987
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影响因子: --
作者:
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DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
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发表时间: 1991
期刊: Molecular endocrinology (Baltimore, Md.)
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DOI: 10.1210/mend-5-5-678
发表时间: 1991
期刊: Molecular endocrinology (Baltimore, Md.)
影响因子: --
作者:
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生长调节素-C/胰岛素样生长因子-I 和胰岛素样生长因子-II 信使核糖核酸的生长激素依赖性。
DOI: 10.1210/mend-1-3-233
发表时间: 1987
期刊: Molecular endocrinology (Baltimore, Md.)
影响因子: --
作者:
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