Induction of Pituitary Cytokine Transcripts by Peripheral Lipopolysaccharide

Induction of Pituitary Cytokine Transcripts by Peripheral Lipopolysaccharide
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外周脂多糖诱导垂体细胞因子转录

DOI:
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发表时间:
1999
影响因子:
3.2
通讯作者:
Herkenharn
Herkenharn
中科院分区:
医学3区
文献类型:
--
作者:
Whiteside;Quan;Herkenharn

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全身给予脂多糖(LPS)可引起垂体激素分泌的深刻变化。促炎细胞因子已被提议作为这些反应的介质。在这项研究中,我们使用原位杂交组织化学研究LPS诱导的细胞因子基因在大鼠垂体中的表达。在腹腔或静脉注射不同剂量的LPS后,早在0.5 h前叶就诱导了立即早期基因IκBu(NF-κB的抑制剂,一种调节许多促炎细胞因子表达的转录因子)的mRNA。 诱导的IκBα mRNA表达在1h达到高峰。 后叶IκBα mRNA在0.5 h开始表达,2 h达高峰。  观察到类似的白细胞介素-1b(IL-1)mRNA诱导的时空模式。此外,在注射后2 h,在前叶和后叶均诱导了TNFα、IL-1β转换酶(ICE)和IL-1受体拮抗剂(IL-1 RA)mRNA。 1型IL-1受体(IL-1 R1)mRNA在垂体中组成性表达,其表达水平在LPS注射后没有变化。有趣的是,编码胶质细胞酸性蛋白(GFAP),星形胶质细胞标记物的mRNA在LPS注射后2 h在后叶被选择性诱导,表明LPS影响垂体细胞功能。 总之,这些结果表明LPS直接作用于垂体以快速诱导细胞因子表达。局部合成的细胞因子可激活细胞因子受体携带细胞以调节垂体的内分泌活动。
Systemically administered lipopolysaccharide (LPS) elicits profound changes in pituitary hormone secretion. Pro‐inflammatory cytokines have been proposed as mediators of these responses. In this study, we used in‐situ hybridization histochemistry to investigate LPS‐induced cytokine gene expression in the rat pituitary. After i.p. or i.v. injection of various doses of LPS, mRNA for the immediate‐early gene IκBu (an inhibitor of NF‐κB, a transcription factor that regulates the expression of many pro‐inflammatory cytokines) was induced in the anterior lobe as early as 0.5 h. The induced IκBα mRNA expression peaked at 1 h. In the posterior lobe, IκBα mRNA was first induced at 0.5 h and peaked at 2 h. A similar spatiotemporal pattern of interleukin‐1b (IL‐1) mRNA induction was observed. In addition, at 2 h after injection, TNFα, IL‐1β converting enzyme (ICE), and IL‐1 receptor antagonist (IL‐1RA) mRNAs were induced in both anterior and posterior lobes. Type 1 IL‐1 receptor (IL‐1R1) mRNA was constitutively expressed in the pituitary, and its expression level did not change after the LPS injection. Interestingly, the mRNA coding for glial fibrillary acidic protein (GFAP), an astrocyte marker, was selectively induced in the posterior lobe at 2 h after LPS injection, suggesting that LPS affects pituicyte function. Together, these results suggest that LPS acts directly on the pituitary to rapidly induce cytokine expression. Locally synthesized cytokines may activate cytokine receptor bearing cells to modulate the endocrine activities of the pituitary.
IL-1 受体阻断不影响内毒素引起的人体血浆甲状腺激素和促甲状腺素浓度的变化。
DOI: 10.1210/jcem.80.4.7714108
发表时间: 1995
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影响因子: --
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vanderPoll,T;VanZee,KJ;Endert,E;Coyle,SM;Stiles,DM;Pribble,JP;Catalano,MA;Moldawer,LL;Lowry,SF
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DOI: --
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发表时间: 1987-10-23
期刊: SCIENCE
影响因子: 56.9
作者:
SAPOLSKY, R;RIVIER, C;VALE, W
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发表时间: 1991-09
期刊: Brain research. Molecular brain research
影响因子: --
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DOI: 10.1242/jeb.139.1.67
发表时间: 1988
期刊: The Journal of experimental biology
影响因子: --
作者:
Hatton,GI
通讯作者: Hatton,GI