For flow cytometric analysis of intestinal TRMs in the lamina propria, small intestine segments were washed, flattened, cut into 1.5cm pieces and shaken in 2 changes of
HBSS with 5% FBS and 2 mM EDTA for 20 min at 37C. The suspension was passed through a mesh strainer to remove epithelial cells. The intestinal pieces were chopped using scissors and shaken in digestion media containing
HBSS (Gibco) with 5% FBS, 1mg/ml Collagenase D, 2U/ml DNase I, 0.1U/ml Dispase for 30 mins at 37C. The digested samples were then vortexed briefly and passed through a 100-micron filter followed by staining for flow cytometry.
Cells were stained with the following fluorochrome-conjugated surface antibodies:
CD45-BUV395 (BD Biosciences; Clone 30-F11),
CD64-PE/Cy7 (Biolegend; Clone X54-5/7.1),
CD11c-Alexa Fluor 488 (eBioscience; Clone N418),
CD11b-APC/Cy7 (Biolegend; Clone M1/70), CX3CR1-BV785 (Biolegend; Clone SA011F11), and F4/80-APC (eBioscience;
Clone BM8). Cellular fluorescence was measured using an
LSRII Fortessa flow cytometer, and data were analyzed using FlowJo software (Tree Star).
Martin A.T., Giri S., Safronova A., Eliseeva S.I., Kwok S.F, & Yarovinsky F. (2024). Parasite-induced IFN-γ regulates host defense via CD115 and mTOR-dependent mechanism of tissue-resident macrophage death. PLOS Pathogens, 20(2), e1011502.