Abstract
Plasticity is a well-known property of macrophages that is controlled by different changes in environmental signals. Macrophage polarization is regarded as a spectrum of activation phenotypes adjusted from one activation extreme, the classic (M1), to the other, the alternative (M2) activation. Here we show, in vitro and in vivo, that both M1 and M2 macrophage phenotypes are tightly coupled to specific patterns of gene expression. Novel M2-associated markers were characterized and identified as genes controlling the extracellular metabolism of ATP to generate pyrophosphates (PPi). Stimulation of M1 macrophages with PPi dampens both NLR and TLR signaling and thus mediates cytokine production. In this context extracellular PPi enhanced the resolution phase of a murine peritonitis model via a decrease in pro-inflammatory cytokine production. Therefore, our study reveals an additional level of plasticity modulating the resolution of inflammation.
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Abbreviations
- ANK:
-
Progressive ankylosis disease susceptibility gene product
- ASC:
-
Apoptotic speck-like protein with a caspase-activating recruiting domain
- ENPP:
-
Ectonucleotide pyrophosphatase/phosphodiesterase
- LDH:
-
Lactate dehydrogenase
- M1:
-
Classically activated macrophages
- M2:
-
Alternatively activated macrophages
- NLR:
-
Nucleotide-binding domain and leucin-rich repeat receptors
- NTPDase-1:
-
Ecto-diphosphohydrolase
- PPi:
-
Pyrophosphates
- ROS:
-
Reactive oxygen species
- TLR:
-
Toll-like receptors
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Acknowledgments
We thank Dr. Olga Fernández and Ms. Ana I. Gomez for in vivo models, technical support, and advice. We appreciate Prof. Annmarie Surprenant and Prof. Alex Verkhratsky for their support during this work. We are indebted to Dr. David Brough for carefully revising the manuscript. This work was supported by grants from Instituto Salud Carlos III FEDER (EMER07/049 and PFIS09/00120) and Fundación Séneca (11922/PI/09), managed by Fundación Formación Investigación Sanitaria Región de Murcia (FFIS).
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The authors declare no competing financial interests.
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G. Lopez-Castejón and A. Baroja-Mazo contributed equally to this work.
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18_2010_609_MOESM1_ESM.tif
Supplemental Fig. 1. Expression of different housekeeping genes during macrophage polarization gradient. A Real-time quantitative (qRT)-PCR for the indicated house-keeping genes (GAPDH, YWHAZ, HPRT1, and SDHA) during the polarization gradient protocol. B qRT-PCR for TNF-α gene expression in M1, M1/M2, or M2 polarized macrophages normalized to the four different housekeeping genes. No significant differences were found in the fold increase/decrease trend among the different macrophage phenotypes. (TIFF 1259 kb)
18_2010_609_MOESM2_ESM.tif
Supplemental Fig. 2. Expression of the 39 analyzed genes in extreme M1 or M2 macrophages. Real-time quantitative RT-PCR for the indicated genes in extreme M1 (A) or M2 (B) polarization. M2 genes are represented in green, M1 in red, and housekeeping genes in blue. Relative expression normalized to YWHAZ was log2 transformed. (TIFF 1398 kb)
18_2010_609_MOESM3_ESM.tif
Supplemental Fig. 3. Gene expression in extreme M1 or M2 macrophages. Dot plot representing log2 transformed expression data from real-time quantitative RT-PCR normalized values for all genes included in this study (Suppl. Fig. 2). Data for each individual gene are represented in accordance with its expression in extreme M1 or M2 genes. R 2 = 0.341. (TIFF 2157 kb)
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Lopez-Castejón, G., Baroja-Mazo, A. & Pelegrín, P. Novel macrophage polarization model: from gene expression to identification of new anti-inflammatory molecules. Cell. Mol. Life Sci. 68, 3095–3107 (2011). https://doi.org/10.1007/s00018-010-0609-y
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DOI: https://doi.org/10.1007/s00018-010-0609-y