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Aged mice exhibit distinct B cell precursor phenotypes differing in activation, proliferation and apoptosis
Elaine Van der Put1, Erin M Sherwood, Bonnie B Blomberg
1Department of Microbiology and Immunology, University of Miami School of Medicine, P.O. Box 016960 R138, Miami, FL 33101, USA.
Experimental Gerontology
|October 29, 2003
Summary
Aging mice show varied bone marrow B cell loss. Severe loss leads to apoptosis-vulnerable precursors, while moderate loss impairs IL-7 response, impacting B cell development in senescence.
Area of Science:
- Immunology
- Aging Research
- Hematopoiesis
Background:
- Senescence is linked to reduced bone marrow pre-B cells in mice.
- Aged mice exhibit heterogeneous patterns of B cell precursor loss.
Purpose of the Study:
- Categorize aged mice by pre-B/pro-B cell loss phenotypes.
- Investigate IL-7 response and apoptosis susceptibility in these phenotypes.
Main Methods:
- Phenotypic categorization of aged BALB/c mice based on B cell precursor loss.
- In vitro assessment of IL-7 response and apoptosis in B cell precursors.
Main Results:
- Moderate pre-B cell loss correlated with reduced proliferation and activation responses to IL-7.
- Severe pre-B cell loss showed a smaller pro-B cell pool with normal IL-7 responses but increased apoptosis.
- Aged mice with severe B lymphopoiesis alterations had higher apoptosis susceptibility.
Conclusions:
- Aged mice may initially accumulate IL-7-refractory B cell precursors.
- These refractory cells might be eliminated via apoptosis.
- The remaining B cell precursors in severe cases retain IL-7 responsiveness.