Static and dynamic components synergize to form a stable survival niche for bone marrow plasma cells

Static and dynamic components synergize to form a stable survival niche for bone marrow plasma cells
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静态和动态成分协同作用,形成骨髓浆细胞稳定的生存生态位

DOI:
10.1002/eji.201344313
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发表时间:
2014
影响因子:
5.4
通讯作者:
A. E. Hauser
A. E. Hauser
中科院分区:
医学3区
文献类型:
--
作者:
Zehentmeier;K. Roth;Z. Cseresnyes;O. Sercan;K. Horn;R. A. Niesner;H. D. Chang;A. Radbruch;A. E. Hauser

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在骨髓(BM)中,记忆浆细胞(PC)在专用的微环境生存龛中存活很长时间,在增殖方面处于静止状态。一些细胞类型,如嗜酸性粒细胞和网状基质细胞,已被报道有助于记忆PC的生存生态位。然而,到目前为止,还没有证明生态位是否由固定的细胞微环境形成。通过活体显微镜,我们首次提供证据表明,PC和网状基质细胞之间形成的直接接触在体内是稳定的,因此PC在其壁龛中是固着的。大多数(约80%)PC以非随机方式直接接触网状基质细胞。与记忆PC接触的间充质网状基质细胞不增殖。另一方面,我们在这里表明,在长寿命的PC附近的嗜酸性粒细胞是积极增殖的细胞,并代表了生存生态位的动态组成部分。相比之下,如果嗜酸性粒细胞被辐射耗尽,则新产生的嗜酸性粒细胞定位于耐辐射PC和基质细胞附近。这些结果表明,记忆PC壁龛可能提供吸引嗜酸性粒细胞,以维持稳定的波动,但必要的辅助细胞。
In the bone marrow (BM), memory plasma cells (PCs) survive for long time periods in dedicated microenvironmental survival niches, resting in terms of proliferation. Several cell types, such as eosinophils and reticular stromal cells, have been reported to contribute to the survival niche of memory PCs. However, until now it has not been demonstrated whether the niche is formed by a fixed cellular microenvironment. By intravital microscopy, we provide for the first time evidence that the direct contacts formed between PCs and reticular stromal cells are stable in vivo, and thus the PCs are sessile in their niches. The majority (∼80%) of PCs directly contact reticular stromal cells in a non‐random fashion. The mesenchymal reticular stromal cells in contact with memory PCs are not proliferating. On the other hand, we show here that eosinophils in the vicinity of long‐lived PCs are vigorously proliferating cells and represent a dynamic component of the survival niche. In contrast, if eosinophils are depleted by irradiation, newly generated eosinophils localize in the vicinity of radiation‐resistant PCs and the stromal cells. These results suggest that memory PC niches may provide attraction for eosinophils to maintain stability with fluctuating yet essential accessory cells.
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