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Bone marrow-thymus axis in senescence
1Department of Anatomy, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0709.
The American Journal of Anatomy
|July 1, 1991
Summary
Aging impairs the bone marrow-thymus axis, affecting immune cell development. Thymus supernatant treatment can restore the migration ability of aged bone marrow stem cells, suggesting a potential therapeutic approach.
Area of Science:
- Immunology
- Gerontology
- Stem Cell Biology
Background:
- The bone marrow-thymus axis is crucial for thymocyte differentiation and immune function.
- Aging is associated with decreased cellular immune function, potentially due to reduced thymic factors.
- Thymic hormones may influence bone marrow stem cells, specifically lymphocyte precursors.
Purpose of the Study:
- To investigate the bone marrow-thymus axis in aged mice.
- To assess the status of pre-thymic stem cells in aged bone marrow.
- To explore the effect of thymus supernatant on aged bone marrow stem cell migration.
Main Methods:
- Utilized Haar's in vitro model to study the bone marrow-thymus axis.
- Employed blind-well chambers with thymus supernatant to assess cell migration.
- Compared erythroid-depleted bone marrow cells from young (3-month) and aged (24-month) mice.
Main Results:
- Pre-thymic stem cells from aged mice showed deficient migration towards thymus supernatant.
- Treatment of aged bone marrow cells with neonatal thymus supernatant significantly improved their migration ability.
- Data support an endocrine influence of the thymus on bone marrow stem cells.
Conclusions:
- Aging negatively impacts the bone marrow-thymus axis and stem cell function.
- Thymus supernatant holds potential for restoring immune cell migration in aged individuals.
- This study highlights the thymus's role in maintaining bone marrow stem cell competence throughout life.