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[Effects of bone marrow endothelial cell conditioned medium and its ultrafiltration-prepared components on the growth
1Laboratory of Blood Physiology, Hunan Medical University, Changsha 410078. wbh@public.cs.hn.cn
Abstract:
In this study, we obtained the serum-free conditioned medium from subcultures of murine bone-marrow-derived endothelial cell line which has been established recently by ourselves. And then, molecular weight (MW) > 10 kD, 3-10 kD, 1-3 kD, 0.5-1 kD and < 0.05 kD components were sifted out from the conditioned medium (mBMEC-CM) by means of serial ultrafiltration. Assays of granulocyte-macrophage colony-forming cell (CFU-GM) were performed to examine the effects of mBMEC-CM and its ultrafiltration-prepared components. It was not observed that mBMEC-CM and MW 3-10 kD component had any significant influence on the growth of CFU-GM. However, MW > 10 kD and 0.5-1 kD components enhanced the proliferation of CFU-GM, whereas MW 1-3 kD and < 0.5 kD ones inhibited it. All these four components exerted their effects on the growth of CFU-GM in dose-dependent way. Our observations suggest that under the conditions of in vitro, murine bone marrow endothelial cells produce several active components which have promoting or inhibitory effects on the growth of CFU-GM.
Insights
Murine bone marrow endothelial cells produce factors that influence blood cell growth. Some components promote granulocyte-macrophage colony-forming cell (CFU-GM) proliferation, while others inhibit it.
Area of Science:
- Hematopoiesis
- Endothelial Cell Biology
- Molecular Biology
Context:
- Murine bone marrow endothelial cells (mBMEC) are crucial for hematopoiesis.
- The specific factors secreted by mBMEC that regulate hematopoietic stem and progenitor cells are not fully understood.
- Conditioned medium from mBMEC cultures provides a source of these regulatory factors.
Purpose:
- To investigate the effects of components from mBMEC-conditioned medium (mBMEC-CM) on the proliferation of granulocyte-macrophage colony-forming cells (CFU-GM).
- To identify specific molecular weight fractions of mBMEC-CM that modulate CFU-GM growth.
Summary:
- Serum-free conditioned medium from mBMEC was fractionated into different molecular weight (MW) components using serial ultrafiltration.
- Components with MW > 10 kD and 0.5-1 kD significantly enhanced CFU-GM proliferation.
- Components with MW 1-3 kD and < 0.5 kD inhibited CFU-GM proliferation, with all effects being dose-dependent.
Impact:
- This study reveals that mBMEC secrete distinct factors with opposing effects on hematopoietic progenitor cells.
- These findings contribute to understanding the intricate crosstalk between endothelial cells and hematopoietic stem cells in the bone marrow niche.
- Identified factors may serve as novel targets for therapeutic strategies aimed at modulating hematopoiesis.
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