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Unuvar Purcu D, Korkmaz A, Gunalp S, Helvaci DG, Erdal Y, Dogan Y, Suner A, Wingender G, Sag D. Effect of stimulation time on the expression of human macrophage polarization markers. PLoS One 2022; 17:e0265196. [PMID: 35286356 PMCID: PMC8920204 DOI: 10.1371/journal.pone.0265196] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 02/27/2022] [Indexed: 12/13/2022] Open
Abstract
Macrophages are highly plastic cells that can polarize into functionally distinct subsets in vivo and in vitro in response to environmental signals. The development of protocols to model macrophage polarization in vitro greatly contributes to our understanding of macrophage biology. Macrophages are divided into two main groups: Pro-inflammatory M1 macrophages (classically activated) and anti-inflammatory M2 macrophages (alternatively activated), based on several key surface markers and the production of inflammatory mediators. However, the expression of these common macrophage polarization markers is greatly affected by the stimulation time used. Unfortunately, there is no consensus yet regarding the optimal stimulation times for particular macrophage polarization markers in in vitro experiments. This situation is problematic, (i) as analysing a particular marker at a suboptimal time point can lead to false-negative results, and (ii) as it clearly impedes the comparison of different studies. Using human monocyte-derived macrophages (MDMs) in vitro, we analysed how the expression of the main polarization markers for M1 (CD64, CD86, CXCL9, CXCL10, HLA-DR, IDO1, IL1β, IL12, TNF), M2a (CD200R, CD206, CCL17, CCL22, IL-10, TGM2), and M2c (CD163, IL-10, TGFβ) macrophages changes over time at mRNA and protein levels. Our data establish the most appropriate stimulation time for the analysis of the expression of human macrophage polarization markers in vitro. Providing such a reference guide will likely facilitate the investigation of macrophage polarization and its reproducibility.
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Affiliation(s)
- Duygu Unuvar Purcu
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Department of Molecular Medicine, Health Sciences Institute, Dokuz Eylul University, Izmir, Turkey
| | - Asli Korkmaz
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Department of Genomic Sciences and Molecular Biotechnology, Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
| | - Sinem Gunalp
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Department of Genomic Sciences and Molecular Biotechnology, Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
| | | | - Yonca Erdal
- Izmir Biomedicine and Genome Center, Izmir, Turkey
| | - Yavuz Dogan
- Department of Microbiology, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
| | - Asli Suner
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Gerhard Wingender
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Department of Biomedicine and Health Technologies, Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
| | - Duygu Sag
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Department of Genomic Sciences and Molecular Biotechnology, Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
- Department of Medical Biology, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
- * E-mail:
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