4.4 Article

Immunofluorescence Staining Using IBA1 and TMEM119 for Microglial Density, Morphology and Peripheral Myeloid Cell Infiltration Analysis in Mouse Brain

Journal

JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
Volume -, Issue 152, Pages -

Publisher

JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/60510

Keywords

Immunology and Infection; Issue 152; mouse; brain; microglia; myeloid cells; neuroimmunology; immunofluorescence; IBA1; TMEM119; microscopy

Funding

  1. Mexican Council of Science and Technology (CONACYT)
  2. Fonds de Recherche du Quebec - Sante
  3. Shastri Indo-Canadian Institute
  4. Natural Sciences and Engineering Research Council of Canada (NSERC)
  5. Fondation Famille-Choquette
  6. Centre thematique de recherche en neurosciences (CTRN)

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This is a protocol for the dual visualization of microglia and infiltrating macrophages in mouse brain tissue. TMEM119 (which labels microglia selectively), when combined with IBA1 (which provides an exceptional visualization of their morphology), allows investigation of changes in density, distribution, and morphology. Quantifying these parameters is important in providing insights into the roles exerted by microglia, the resident macrophages of the brain. Under normal physiological conditions, microglia are regularly distributed in a mosaic-like pattern and present a small soma with ramified processes. Nevertheless, as a response to environmental factors (i.e., trauma, infection, disease, or injury), microglial density, distribution, and morphology are altered in various manners, depending on the insult. Additionally, the described double-staining method allows visualization of infiltrating macrophages in the brain based on their expression of IBA1 and without colocalization with TMEM119. This approach thus allows discrimination between microglia and infiltrating macrophages, which is required to provide functional insights into their distinct involvement in brain homeostasis across various contexts of health and disease. This protocol integrates the latest findings in neuroimmunology that pertain to the identification of selective markers. It also serves as a useful tool for both experienced neuroimmunologists and researchers seeking to integrate neuroimmunology into projects.

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