Journal: Cell reports

Article Title: Mast cell-specific CysLT2 receptor signaling inhibits cysteinyl leukotriene-dependent mast cell activation and type 2 allergic lung inflammation

doi: 10.1016/j.celrep.2025.116758

Figure Lengend Snippet: (A) Protocol to induce allergic airway inflammation in Cysltr2 flox /Cpa3 cre (MC-specific Cysltr2 KO) mice and littermate controls. Df (1 μg) was administered intranasally on days 0, 4, 7, 11, 14, and 18. Euthanasia was performed 48 h after the last Df challenge. (B) Total/eosinophil cell counts and eosinophil (%) in BAL fluid of Df -treated Cre− (male, n = 8; female, n = 7) and Cre+ (male, n = 6; female, n = 8) on day 20. Total BAL cell numbers were counted by an automated cell counter (Bio-Rad TC20). Eosinophils were defined as CD45-positive/SiglecF-positive/CD11c-negative by flow cytometry. The percentage of eosinophils in the total BAL fluid cell population was calculated by comparing the eosinophil count to the total CD45 + cell count. (C and D) Total lung ILC2/β7+ MC counts and Il5 transcript expression in Df -treated Cre− (male, n = 8; female, n = 7) and Cre+ (male, n = 6; female, n = 8) on day 20. Lung total cell numbers were determined using an automated cell counter (Bio-Rad TC20). (E) BAL fluid levels of PGD 2 and cysLTs (LTC 4 , LTD 4 , and LTE 4 ) in Df -treated Cre− (male, n = 8; female, n = 7) and Cre+ (male, n = 6; female, n = 8) on day 20. Values are mean ± SEM. * p < 0.05, by Mann-Whitney U test. (F–J) Similar analyses as in (A)–(E) were performed using female Cysltr2 flox /Cpa3 cre mice receiving vehicle (PBS) or CysLT 1 R antagonist montelukast (i.p. 30 mg/kg on days 0, 4, 7, 11, 14, and 18). Values are mean ± SEM. Df -treated Cre− (Veh, n = 14; montelukast, n = 11) and Cre+ (Veh, n = 14; montelukast, n = 11) from independent two experiments. * p < 0.05 compared to Cre −/PBS, # p < 0.05, ## p < 0.01 compared to Cre+/PBS, by two-way ANOVA with Sidak’s multiple comparisons test.

Article Snippet: TC20 TM Data Analyzer Software , BioRad , https://www.bio-rad.com/webroot/web/html/lsr/products/cell_counting/product_overlay/global/tc20-data-ana.html.

Techniques: Flow Cytometry, Cell Characterization, Expressing, MANN-WHITNEY