Heparan Sulfate and Heparin Enhance ERK Phosphorylation and Mediate preBCR-Dependent Events during B Lymphopoiesis1

Heparan Sulfate and Heparin Enhance ERK Phosphorylation and Mediate preBCR-Dependent Events during B Lymphopoiesis1
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硫酸乙酰肝素和肝素增强 ERK 磷酸化并介导 B 淋巴细胞生成期间前 BCR 依赖性事件1

DOI:
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发表时间:
2008
影响因子:
4.4
通讯作者:
C. Paige
C. Paige
中科院分区:
医学2区
文献类型:
--
作者:
C. Milne;S. A. Corfe;C. Paige

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随着 B 谱系细胞的发育,它们与周围微环境的细胞、蛋白质和细胞外基质成分相互作用。在体外,当细胞失去对 IL-7 的反应性时,发育中的细胞就会出现一个关键检查点。这些细胞需要与基质细胞或其他 B 谱系细胞接触才能成熟。我们的结果表明,当外源添加到培养系统中或当含有硫酸乙酰肝素的细胞系与原代 B 细胞祖细胞共培养时,硫酸乙酰肝素和肝素能够促进这种转变。与未处理的培养物相比,向 LPS 刺激的原代 B 细胞祖细胞培养物中添加硫酸乙酰肝素或肝素会导致分泌更多的 IgM。据报道,硫酸乙酰肝素是前 B 细胞受体 (preBCR) 的配体。扩展这一观察,我们发现在抗 μ 刺激之前用硫酸乙酰肝素处理 preBCR+ 细胞会导致 ERK1/2 磷酸化增加。因此,前BCR+细胞在IL-7和硫酸乙酰肝素存在的情况下增殖更多,而前BCR-细胞不受影响,这表明在这些实验中,硫酸乙酰肝素不直接影响IL-7活性。肝素处理培养物会引起许多与硫酸乙酰肝素处理相同的生物效应,包括 preBCR+ 细胞中 pERK 水平升高。然而,肝素降低了仅表达前BCR(与前BCR和BCR两者相反)的细胞的增殖,可能是由于前BCR的内化。硫酸乙酰肝素存在于造血组织中的基质细胞和 B 谱系细胞上,并且可以刺激前 B 细胞测试前 BCR 的信号传导能力。
As B lineage cells develop, they interact with cells, proteins, and extracellular matrix components of the surrounding microenvironment. In vitro, one critical checkpoint for developing cells occurs as they lose responsiveness to IL-7. These cells require contact with either stromal cells or other B lineage cells to mature. Our results demonstrate that heparan sulfate and heparin are able to promote this transition when added exogenously to the culture system or when heparan sulfate-bearing cell lines are cocultured with primary B cell progenitors. Addition of heparan sulfate or heparin to LPS-stimulated cultures of primary B cell progenitors resulted in more IgM secreted compared with untreated cultures. Heparan sulfate has been reported to be a ligand for the pre-B cell receptor (preBCR). Extending this observation, we found that treatment of preBCR+ cells with heparan sulfate before anti-μ stimulation leads to increased phosphorylation of ERK1/2. Consequently, preBCR+ cells proliferate more in the presence of IL-7 and heparan sulfate, whereas preBCR− cells are unaffected, suggesting that in these experiments, heparan sulfate is not directly affecting IL-7 activity. Heparin treatment of cultures induces many of the same biological effects as treatment with heparan sulfate, including elevated pERK levels in preBCR+ cells. However, heparin reduces the proliferation of cells expressing only the preBCR (opposed to both the preBCR and BCR) possibly due to internalization of the preBCR. Heparan sulfates are present on stromal cells and B lineage cells present in hemopoietic tissues and may provide stimulation to preB cells testing the signaling capacity of the preBCR.
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