Abbreviations
BMMCs
DNP
FcεRI
HSA
mTOR
mTORC1
mTORC2
S6K
TNF-α
4E-BP1
INTRODUCTION
MATERIALS AND METHODS
Murine bone marrow-derived mast cell (BMMC) culture
β-hexosaminidase release assay
Immunoblotting analysis
Cytokine production
BMMC apoptosis and proliferation
Statistical analysis
RESULTS AND DISCUSSION
MHY1485 increases mTORC1 signaling and suppresses mast cell function following FcεRI stimulation
![]() | Figure 1Effects of MHY1485 on FcεRI-mediated degranulation and cytokine production in mast cells. BMMCs were sensitized for 5 h, incubated with the indicated concentration of MHY1485 for 1 h, and then either unstimulated (unstim) or stimulated with the DNP-HSA Ag. (A) Time-course immunoblot analysis for mTOR signaling, with or without MHY1485, following Ag stimulation. Band densities of pS6K on Thr389 and pAkt on Ser473 were normalized to their total protein expression from the results of 3 independent experiments. AU represents arbitrary unit. (B) Degranulation was assessed by measuring β-hexosaminidase release 30 min after stimulation. (C) The levels of IL-6 and TNF-α proteins in the media were analyzed using ELISA 6 h after stimulation. (D) qRT-PCR analysis for FcεRI-mediated induction of Il6 and Tfna mRNA was carried out 1 h after Ag stimulation. Bar graphs are shown as mean±standard error of the mean of triplicates and are representative of 3 independent experiments. A p-value of less than 0.05 between stimulated groups with and without MHY1485 treatment is judged significant and indicated.pS6K, phospho-S6K; Thr389, threonine 389; pAkt, phospho-Akt; Ser473, serine 473; qRT-PCR, quantitative real-time PCR.
*p<0.05, **p<0.01, ***p<0.001.
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MHY1485 suppresses mast cell proliferation
![]() | Figure 2Effects of MHY1485 on mast cell proliferation and apoptosis. BMMCs were cultured in IL-3 sufficient or deficient media, with or without the indicated concentrations of MHY1485 for 6 days. (A) WST-8 assay to determine cell numbers 6 days after culture. (B) IL-3 withdrawal-induced cell death. Annexin V-positive apoptotic cells were analyzed using flow cytometry. (C) Cell proliferation analysis. CFSE-labeled BMMCs were cultured in the indicated conditions and CFSE dilutions were analyzed using flow cytometry. The gMFI of each histogram was used to represent the cell proliferation activity. Data are shown as mean ± standard error of the mean of triplicates and are representative of 3 independent experiments. Statistical significance between non-treated and MHY1485-treated cells is indicated.gMFI, geometric mean fluorescence intensity.
*p<0.05, **p<0.01, ***p<0.001.
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