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Age-related changes in the capability of the bone marrow to generate B cells.

D Zharhary
J Immunol September 15, 1988, 141 (6) 1863-1869;
D Zharhary
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Abstract

The capability of the bone marrow (BM) to generate new B cells in aging was studied in vitro. BM cells from old (26 to 30 mo) or young (3 mo) BALB/c and (C3H/eB x C57BL/6)F1 mice were depleted of mature B cells and these surface Ig (sIg) BM cells were incubated in culture for 3 days. The frequency of newly generated B cells in these cultures was determined by assessing the frequency of slg+ cells and of B cells forming colonies in agar and by assaying the proliferative capacity of these newly generated B cells after stimulation by LPS. We found that BM cells from aged mice are significantly inferior to young ones in their capability to generate new B cells in culture. By mixing old and young slg- BM cells, we found that, in general, this reduction was not caused by a suppressive effect of T cells or of any other cells, but rather to lack of some sort of supportive cell or factor in the aged BM. In addition, we found that the frequency of cells expressing the B220 surface molecule, a B lineage-specific marker, is significantly reduced in aged BM. These results indicate that a quantitative decrease in B cell progenitors combined with changes in cell populations that are important in supporting B cell generation contribute to the age-related decrease in the capacity to generate B cells.

  • Copyright © 1988 by American Association of Immunologists

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The Journal of Immunology
Vol. 141, Issue 6
15 Sep 1988
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Age-related changes in the capability of the bone marrow to generate B cells.
D Zharhary
The Journal of Immunology September 15, 1988, 141 (6) 1863-1869;

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Age-related changes in the capability of the bone marrow to generate B cells.
D Zharhary
The Journal of Immunology September 15, 1988, 141 (6) 1863-1869;
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Print ISSN 0022-1767        Online ISSN 1550-6606