期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 283, 期 7, 页码 4189-4199出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M705725200
关键词
-
资金
- Intramural NIH HHS Funding Source: Medline
We show that co-expression of interleukin 15 (IL-15) and IL-15 receptor alpha(IL-15R alpha) in the same cell allows for the intracellular interaction of the two proteins early after translation, resulting in increased stability and secretion of both molecules as a complex. In the absence of co-expressed IL-15R alpha, a large portion of the produced IL-15 is rapidly degraded immediately after synthesis. Co-injection into mice of IL-15 and IL-15R alpha expression plasmids led to significantly increased levels of the cytokine in serum as well as increased biological activity of IL-15. Examination of natural killer cells and T lymphocytes in mouse organs showed a great expansion of both cell types in the lung, liver, and spleen. The presence of IL-15R alpha also increased the number of CD44(high) memory cells with effector phenotype (CD44(high)CD62L-). Thus, mutual stabilization of IL-15 and IL-15R alpha leads to remarkable increases in production, stability, and tissue availability of bioactive IL-15 in vivo. The in vivo data show that the most potent form of IL-15 is as part of a complex with its receptor alpha either on the surface of the producing cells or as a soluble extracellular complex. These results explain the reason for coordinate expression of IL-15 and IL-15R alpha in the same cell and suggest that the IL-15R alpha is part of the active IL-15 cytokine rather than part of the receptor.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据