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Both the pre-BCR and the IL-7Ralpha are essential for expansion at the pre-BII cell stage in vivo.

Eur. J. Immunol.2005 Jun;35(6):1969-76. doi:10.1002/eji.200425821
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摘要


During B cell development, proliferative expansion takes place after expression of the pre-BCR. At this pre-BII cell stage, the IL-7Ralpha is also expressed. Some in vitro studies suggest that pre-BCR-dependent expansion relies on the IL-7Ralpha, and others that it does not. It has also been suggested that the pre-BCR mediates down-regulation of the IL-7Ralpha. However, the in vivo relationship between the pre-BCR and the IL-7Ralpha has not been previously examined. Here, we have investigated this by establishing mice lacking both receptors. Our results show that in the absence of the IL-7Ralpha, the pre-BII population is reduced, as previously seen in mice lacking the pre-BCR, demonstrating that the IL-7Ralpha is important at this stage. A deficiency in both receptors results in a further reduction of the pre-BII cell population. We conclude that both the IL-7Ralpha and the pre-BCR are required for optimal pre-BII cell expansion. Furthermore, IL-7Ralpha expression levels are normal in pre-BCR-deficient mice, suggesting that the pre-BCR does not mediate its down-regulation. As a consequence of the absence of both receptors, the peripheral B cell pool is severely depleted, resulting in atypical splenic B cell structures and reduced serum Ig levels.

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