Journal of cardiovascular computed tomography·2019
Area of Science:
Hematology
Stem Cell Biology
Microenvironment Research
Background:
The Sl/Sld mouse model exhibits a defective hematopoietic stromal microenvironment.
Understanding the role of the microenvironment in hematopoiesis is crucial for regenerative medicine.
Purpose of the Study:
To investigate the influence of the recipient's microenvironment on ectopic hematopoietic stem cell (HSC) engraftment.
To determine if the recipient's stromal cells can support or enhance the function of transplanted marrow.
Main Methods:
Ectopic marrow implantation beneath the renal capsule in Sl/Sld and normal littermate mice.
Analysis of stem cell content, including colony-forming unit-spleen (CFU-S) and granulocyte-macrophage colony-forming cells (GM-CFC), in ectopic marrow sites.
Main Results:
Marrow from Sl/Sld mice in a normal recipient produced ectopic marrow with comparable stem cell numbers (CFU-S) and nearly normal GM-CFC levels.
Marrow from Sl/Sld mice in an Sl/Sld recipient resulted in significantly reduced CFU-S and GM-CFC levels.
Normal marrow in an Sl/Sld recipient also showed reduced stem cell support compared to normal recipients.
Conclusions:
The recipient's microenvironment plays a significant role in supporting ectopic hematopoietic stem cell function.
Normal recipient stromal cells can partially compensate for the defect in Sl/Sld donor marrow, suggesting a crucial interaction.