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Fragmin/protamine microparticle-coated matrix immobilized cytokines to stimulate various cell proliferations with low
Satoko Kishimoto1, Shingo Nakamura, Shin-ichiro Nakamura
1Research Institute, National Defense Medical College, Tokorozawa, Saitama, Japan.
Abstract:
Fragmin/protamine microparticles (F/P MPs) have been shown to bind to culture plates, thereby retaining heparin-binding cytokines. Most protocols for in vitro cultures of human microvascular endothelial cells (hMVECs), human dermal fibroblast cells (hDFCs), and hematopoietic cell line (TF-1) include high fetal bovine serum (FBS) (10%) medium as a nutritional supplement. Growth rates of those cells on the F/P MP-coated plates were higher in low FBS (1%) medium containing fibroblast growth factor (FGF)-2 (for hMVECs and hDFCs) and interleukin (IL)-3/granulocyte-macrophage colony-stimulating factor (for TF-1 cells) than without coating. The cytokines in low FBS medium were shown to be immobilized on the F/P MP-coated plate and released into the culture medium with a half releasing time of 4-5 days. Furthermore, those cells grew well on each cytokine-preimmobilized F/P MP-coated plate in low FBS medium. Thus, the F/P MP-coated matrix with adequate heparin-binding cytokines may provide biomaterials for controlling cellular growth and differentiation.
Insights
Fragmin/protamine microparticles (F/P MPs) enhance cell growth in low-serum conditions by binding and slowly releasing essential growth factors. This biomaterial coating offers a novel method for controlling cell proliferation and differentiation in vitro.
Area of Science:
- Biomaterials Science
- Cell Biology
- Tissue Engineering
Background:
- Standard in vitro cell culture protocols often require high concentrations of fetal bovine serum (FBS).
- Fragmin/protamine microparticles (F/P MPs) can bind heparin-binding cytokines, suggesting potential applications in cell culture.
- High FBS concentrations can be costly and introduce variability in experimental results.
Purpose of the Study:
- To investigate the efficacy of F/P MP-coated plates in supporting the growth of human microvascular endothelial cells (hMVECs), human dermal fibroblast cells (hDFCs), and the TF-1 cell line in low FBS medium.
- To evaluate the controlled release of immobilized cytokines from F/P MP-coated plates.
- To determine if F/P MP-coated matrices can serve as biomaterials for controlling cellular behavior.
Main Methods:
- Coating culture plates with F/P MPs.
- Culturing hMVECs, hDFCs, and TF-1 cells in low FBS (1%) medium with and without F/P MP coating.
- Supplementing low FBS medium with specific growth factors: fibroblast growth factor (FGF)-2 for hMVECs/hDFCs and interleukin (IL)-3/granulocyte-macrophage colony-stimulating factor for TF-1 cells.
- Measuring cell growth rates.
- Assessing cytokine release kinetics from the coated plates.
Main Results:
- Cell growth rates were significantly higher on F/P MP-coated plates in low FBS medium compared to uncoated plates.
- Immobilized cytokines were released from the F/P MP-coated plates with a half-life of 4-5 days.
- Cells demonstrated robust growth on F/P MP-coated plates pre-immobilized with specific cytokines, even in low FBS conditions.
Conclusions:
- F/P MP-coated matrices effectively retain and release heparin-binding cytokines, supporting robust cell growth in reduced FBS concentrations.
- This biomaterial strategy offers a promising approach for developing controlled cellular growth and differentiation systems.
- F/P MP-coated plates represent a valuable tool for optimizing in vitro cell culture, potentially reducing costs and improving experimental consistency.
