Identification of a cytotoxic form of dimeric interleukin-2 in murine tissues.

Identification of a cytotoxic form of dimeric interleukin-2 in murine tissues.
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DOI:
10.1371/journal.pone.0102191
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Miller JD
Miller JD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wrenshall LE;Clabaugh SE;Cool DR;Arumugam P;Grunwald WC;Smith DR;Liu GC;Miller JD

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白细胞介素-2 (IL-2) 是一种多方面的细胞因子,以根据细胞类型和状态促进增殖、存活和细胞死亡而闻名。例如,当抗原和 IL-2 丰富时,IL-2 仅在活化的 T 细胞中促进细胞死亡。 IL-2 的可用性明显影响这一过程。我们的实验室最近证明,硫酸乙酰肝素将 IL-2 保留在血管中,并且乙酰肝素酶将具有生物活性的 IL-2 从血管组织中释放出来。我们现在证明乙酰肝素酶消化还释放二聚体形式的 IL-2,其对表达 IL-2 受体的细胞具有高度细胞毒性。这些细胞包括“传统”IL-2 受体承载细胞(例如淋巴细胞),以及那些不太了解 IL-2 受体表达的细胞(例如上皮细胞和平滑肌细胞)。二聚体 IL-2 诱导的形态变化和快速细胞死亡表明细胞死亡是通过膜通透性破坏和随后的坏死介导的。这些发现表明,IL-2 对免疫和非免疫系统中的细胞稳态机制具有直接且出乎意料的广泛影响。
Interleukin-2 (IL-2) is a multi-faceted cytokine, known for promoting proliferation, survival, and cell death depending on the cell type and state. For example, IL-2 facilitates cell death only in activated T cells when antigen and IL-2 are abundant. The availability of IL-2 clearly impacts this process. Our laboratory recently demonstrated that IL-2 is retained in blood vessels by heparan sulfate, and that biologically active IL-2 is released from vessel tissue by heparanase. We now demonstrate that heparanase digestion also releases a dimeric form of IL-2 that is highly cytotoxic to cells expressing the IL-2 receptor. These cells include “traditional” IL-2 receptor-bearing cells such as lymphocytes, as well as those less well known for IL-2 receptor expression, such as epithelial and smooth muscle cells. The morphologic changes and rapid cell death induced by dimeric IL-2 imply that cell death is mediated by disruption of membrane permeability and subsequent necrosis. These findings suggest that IL-2 has a direct and unexpectedly broad influence on cellular homeostatic mechanisms in both immune and non-immune systems.
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