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Updated: Jun 27, 2025
Proteomic Analysis of Human Macrophage Polarization Under a Low Oxygen Environment
Published on: January 7, 2019
Using Macrophage Polarization in Human Platelet Lysate to Test the Immunomodulatory Potential of Cells for Clinical
Silvia Lopa1, Francesca Libonati2, Katia Mareschi3,4
1Cell and Tissue Engineering Laboratory, IRCCS Istituto Ortopedico Galeazzi, Via C. Belgioioso 173, 20157 Milan, Italy.
Insights
Human platelet lysate (hPL) offers a GMP-compliant alternative to Fetal Bovine Serum (FBS) for macrophage co-cultures. While hPL supports similar marker regulation, cautious interpretation is needed due to differing basal levels.
Area of Science:
- Immunology and Cell Biology
- Biotechnology and Regenerative Medicine
Background:
- Macrophage co-cultures are crucial for evaluating immunomodulatory functions of cells for clinical applications.
- Fetal Bovine Serum (FBS) is commonly used but faces regulatory challenges; human platelet lysate (hPL) is explored as a GMP-compliant alternative.
Purpose of the Study:
- To characterize a macrophage polarization model using hPL as a GMP-compliant substitute for FBS.
- To assess the immunomodulatory potential of chondrocytes in an hPL-based co-culture system for osteoarthritis treatment.
Main Methods:
- Primary human monocytes were differentiated into M0, M1, M2a, and M2c macrophages using hPL- or FBS-based media.
- Protein secretion profiles and phenotypic markers (CD80, CD206, CD163) were analyzed.
- Chondrocytes were co-cultured with macrophages in an hPL-based system to evaluate immunomodulatory interactions.
Main Results:
- Macrophage polarization showed comparable marker regulation between hPL and FBS cultures.
- hPL-cultured macrophages exhibited lower basal levels of CD206 and CD163 compared to FBS.
- Co-culture with chondrocytes increased CD206 expression in macrophages, irrespective of the culture medium (hPL or FBS).
Conclusions:
- Human platelet lysate (hPL) is a viable GMP-compliant alternative to FBS for macrophage-based co-cultures.
- Differences in basal marker expression (CD206, CD163) in hPL cultures necessitate careful interpretation of immunomodulatory assay results.
- The study validates hPL for macrophage-chondrocyte co-cultures, relevant for osteoarthritis research and clinical translation.
Abstract:
Macrophage-based co-cultures are used to test the immunomodulatory function of candidate cells for clinical use. This study aimed to characterize a macrophage polarization model using human platelet lysate (hPL) as a GMP-compliant alternative to Fetal Bovine Serum (FBS). Primary human monocytes were differentiated into unpolarized (M0) or polarized (M1, M2a, and M2c) macrophages in an hPL- or FBS-based medium. The protein secretion profiles and expression of phenotypic markers (CD80 for M1, CD206 for M2a, and CD163 for M2c) were analyzed. Subsequently, chondrocytes were tested in an hPL-based co-culture model to assess their immunomodulatory function in view of their possible use in patients with osteoarthritis. The results showed similar marker regulation between hPL and FBS cultures, but lower basal levels of CD206 and CD163 in hPL-cultured macrophages. Functional co-culture experiments with chondrocytes revealed increased CD206 expression both in hPL and in FBS, indicating an interaction between macrophages and chondrocytes. While markers in FBS-cultured macrophages were confirmed in hPL-cultured cells, the interpretation of marker modulation in immunomodulatory assays with hPL-based cultures should be carried out cautiously due to the observed differences in the basal marker levels for CD206 and CD163. This research underscores the utility of hPL as a GMP-compliant alternative to FBS for macrophage-based co-cultures and highlights the importance of understanding marker expressions in different culture conditions.
