Assessing Phenotypic Heterogeneity in Intestinal Tissue Eosinophils.

Eosinophils are primarily tissue-dwelling leukocytes. Utilization of flow cytometry techniques applied to digested tissues is expanding the scope of organs within which eosinophils are identified at baseline and is providing deeper insights into categorizing phenotypically and functionally distinct tissue-resident eosinophil subpopulations in health and disease. Here we describe a tissue digestion protocol and flow cytometry gating strategy for identification and isolation of tissue eosinophils from the small intestine of mice. This protocol is also amenable to the isolation and characterization of colonic eosinophils, and of intestinal eosinophils from human resected tissues.