Introduction of M1 Macrophages
Macrophages play an important role in a wide variety of physiologic and pathologic processes. Plasticity and functional polarization are hallmarks of macrophages. As one of the two important subsets, M1 macrophages are typically induced by bacterial LPS or by some cytokines, such as Interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and granulocyte-macrophage colony-stimulating factor (GM-CSF). M1 macrophages are characterized by high proinflammatory cytokine production, high chemokine (C-X-C motif) ligand 9 (CXCL9) production, and low levels of interleukin (IL)-10. Efficient M1 macrophage responses are important for ensuring resistance to bacterial infection. Many pathogens such as Brucella, Salmonella, and Mycobacterium have evolved mechanisms that interfere with M1 polarization. Conversely, excessive or unresolved M1 macrophage activation can cause chronic inflammation and tissue damage. Studies have shown that M1 macrophages are related to the pathogenesis of atherosclerosis, diabetes, and glomerulonephritis. In the nervous system, M1 macrophages have been associated with multiple sclerosis, amyotrophic lateral sclerosis, stroke, spinal cord injury, and traumatic brain injury.
M1 Macrophage Identification Service at Creative Biolabs
Identification of M1subsets at Creative Biolabs is usually carried out by quantification of M1 macrophage markers, including multiple cell surface markers, transcription factors, and cytokine profiles. IFN-γ, IL-1, IL-6, IL-10, IL-12, IL-23, TNF-α, CD16, CD32, CD64, CD68, CD80, CD86, CD369, inducible nitric oxide synthase (iNOS), signal transducer and activator of transcription 1 (STAT1), interferon regulatory factor 5 (IRF5), Mer tyrosine kinase (MerTK), class II major histocompatibility complex molecules (MHC class II), and CXCL9 are reliable markers for human M1 macrophages, while IFN-γ, IL-1, IL-6 IL-10,IL-12, IL-23, TNF-α, CD14, CD16, CD32, CD64, CD68, CD80, CD86, CD204, CD369, IRF5, MerTK, MHC II, and Ly-6C are often used for the identification of mouse M1 macrophages. Based on our powerful Macrophage Therapeutics Development Platform, our scientists are proficient at applying real-time PCR for transcriptional signature analysis, liquid chromatography-tandem mass spectrometry (LC-MS/MS) for proteome analysis, western blot (WB), immunohistochemistry (IHC), and flow cytometry (FC) for a comprehensive analysis of M1 macrophages.
Learn more: Classically Activated M1 Macrophage