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Updated: Mar 29, 2026
Purification of Human S100A12 and Its Ion-induced Oligomers for Immune Cell Stimulation
Published on: September 29, 2019
Nylon wool column--a tool for obtaining monokine-rich eluates in the absence of serum
1Instituto Nacional do Câncer, Pesquisa Básica/*CEMO, Rio de Janeiro, RJ, Brasil.
Insights
Researchers optimized conditions for stimulating human mononuclear cells to release thymocyte costimulatory factors. This work enhances the yield of these crucial immune-signaling molecules for further study and purification.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Human mononuclear cells are a source of critical immune-signaling molecules.
- Optimizing the production of these factors is essential for further research and therapeutic development.
Purpose of the Study:
- To identify optimal conditions for stimulating human mononuclear cells to release high titers of thymocyte costimulatory factors.
- To improve the yield and purity of these bioactive peptides.
Main Methods:
- Stimulation of human mononuclear cells with varying lipopolysaccharide (LPS) concentrations.
- Assessment of monokine release and thymocyte costimulatory activity.
- Use of indomethacin and nylon wool columns to modulate cell activity and density.
Main Results:
- Activity titers plateaued between 1-10 µg/ml LPS.
- Indomethacin did not affect monokine release but inhibitory substances impacted assay results.
- Nylon wool columns increased cellular densities without reducing activity, enabling serum-free yield maintenance.
Conclusions:
- Specific LPS concentrations are optimal for monokine production.
- Cellular density and assay conditions significantly influence the measurement of thymocyte costimulatory activity.
- The described methods facilitate higher yields of bioactive peptides, aiding purification efforts.
Abstract:
Diverse conditions for stimulating human mononuclear cells to release thymocyte costimulatory factors were tested for their contribution to the generation of supernatants containing high titers of these monokines. Activity titers increased with LPS concentration, reaching a plateau between 1 and 10 micrograms/ml. Indomethacin did not modify the monokine release, but the assay for thymocyte costimulatory activity was substantially affected by inhibitory substances produced by the monocytes in the absence of indomethacin. The use of nylon wool columns to trap the cells was shown to be effective in raising cellular densities without decreasing activity titers. As a result, the yield per cell could be maintained even in the absence of serum, an important step toward the goal of purifying bioactive peptides from crude broths.
