Interferon-gamma is an inducer of plasminogen activator inhibitor type 1 in human orbital fibroblasts.

Interferon-gamma is an inducer of plasminogen activator inhibitor type 1 in human orbital fibroblasts.
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Interferon-gamma 是人眼眶成纤维细胞中 1 型纤溶酶原激活剂抑制剂的诱导剂。

DOI:
10.1152/ajpcell.1992.263.1.c24
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发表时间:
1992
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Higgins,PJ
Higgins,PJ
中科院分区:
--
文献类型:
--
作者:
Smith,TJ;Ahmed,A;Hogg,MG;Higgins,PJ

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纤溶酶原激活物抑制剂1型(PAI-1)是细胞周围蛋白水解环境的重要决定因素,在培养的人眼眶和真皮成纤维细胞中进行了表达评估。总细胞[35S]蛋氨酸标记蛋白的双向电泳分离显示,50 kda PAI-1蛋白(等电点范围5.6-6.3)在真皮菌株中表达,但在眼眶培养中不表达。将人重组干扰素- γ (100 U/ml)添加到培养基中48小时,可显著诱导眼眶培养物中PAI-1的表达(比基线高50倍以上),而真皮培养物中的表达要么减弱,要么适度诱导(5倍)。50 kda PAI-1的身份通过分泌蛋白的免疫沉淀得到验证。间接免疫荧光将PAI-1定位于单层腹下表面的聚集体。干扰素在培养细胞中诱导了其他几种蛋白质。未经治疗的眼眶成纤维细胞不表达可检测到的细胞相关PAI-1,这表明这些细胞的细胞周围蛋白水解环境通常由其他因素调节。眼眶结缔组织细胞外基质的经济性可能特别容易受到炎性细胞因子如干扰素- γ的影响。
Expression of plasminogen activator inhibitor type 1 (PAI-1), an important determinant of the pericellular proteolytic environment, was assessed in cultured human orbital and dermal fibroblasts. Bidimensional electrophoretic separation of total cellular [35S]methionine-labeled proteins revealed multiple isoforms of the 50-kDa PAI-1 protein (isoelectric point range 5.6-6.3) expressed in dermal strains but not in orbital cultures. The addition of human recombinant interferon-gamma (100 U/ml) to the media for 48 h resulted in a marked induction of PAI-1 in the orbital cultures (greater than 50-fold above baseline), whereas the expression in dermal cultures was either attenuated or induced modestly (5-fold). The identity of the 50-kDa PAI-1 was verified by immunoprecipitation of secreted proteins. Indirect immunofluorescence localized PAI-1 to aggregates at the ventral undersurface of the monolayer. Interferon-gamma induced several other proteins in cultured cells. The observation that untreated orbital fibroblasts do not express detectable cell-associated PAI-1 suggests that the pericellular proteolytic environment of these cells is regulated ordinarily by other factors. The economy of the extracellular matrix of orbital connective tissue may be particularly susceptible to the influence of inflammatory cytokines such as interferon-gamma.
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