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
复制标题
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
作者:
C. Milne;S. A. Corfe;C. Paige
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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影响因子:
4.4
作者:
Manabu Fujimoto;J. Poe;Paul J. Jansen;S. Sato;Thomas F. Tedder
通讯作者:
Manabu Fujimoto;J. Poe;Paul J. Jansen;S. Sato;Thomas F. Tedder
DOI:
--
发表时间:
1998
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Lai,L;Chen,F;McKenna,S;Goldschneider,I
通讯作者:
Goldschneider,I
DOI:
10.1073/pnas.96.21.11952
发表时间:
1999
影响因子:
11.1
作者:
Bosma,GC;Chang,Y;Karasuyama,H;Bosma,MJ
通讯作者:
Bosma,MJ
DOI:
--
发表时间:
1996
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Krop,I;Shaffer,AL;Fearon,DT;Schlissel,MS
通讯作者:
Schlissel,MS
影响因子:
4.4
作者:
Chen,J;Herzenberg,LA;Herzenberg,LA
通讯作者:
Herzenberg,LA