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Humanized Mediator Release Assay as a Read-Out for Allergen Potency
Published on: June 29, 2021
RBL-2H3 cells are an imprecise model for mast cell mediator release
Egle Passante1, Carsten Ehrhardt, Helen Sheridan
1School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin 2, Ireland.
Summary
The RBL-2H3 cell line shows promise for studying IgE-mediated mast cell degranulation in vitro. However, its expression of Toll-like receptors and other characteristics suggest it may resemble basophils more than typical mast cells.
Area of Science:
- Immunology
- Cell Biology
Background:
- The RBL-2H3 cell line is a common model for mast cell research.
- Existing data on RBL-2H3 cells is often contradictory, necessitating further investigation into their suitability for degranulation studies.
Purpose of the Study:
- To evaluate the RBL-2H3 cell line as an in vitro model for mast cell degranulation.
- To compare the expression of Toll-like receptors (TLRs) in RBL-2H3 cells and primary rat peritoneal mast cells (RPMC).
Main Methods:
- RBL-2H3 cells were stimulated with various agents (IgE, A23187, compound 48/80, etc.) to analyze mediator release.
- RT-PCR was used to compare TLR mRNA expression between RBL-2H3 cells and RPMC.
- Flow cytometry (FACS) was employed to analyze TLR4 and CD14 surface protein expression on RBL-2H3 cells.
Main Results:
- Mediator release was influenced by media composition, with IgE and A23187 effectively stimulating degranulation.
- Quercetin inhibited degranulation, while cromoglycate and ketotifen did not.
- RBL-2H3 cells expressed TLR3-6 mRNA, whereas RPMC expressed TLR1-6 and TLR8. TLR4 protein was detected in RBL-2H3 cells, but CD14 was largely absent.
Conclusions:
- RBL-2H3 cells can serve as a model for IgE-mediated mast cell degranulation.
- However, their overall profile, particularly TLR expression and CD14 absence, suggests they may be more representative of basophils than other mast cell types.
- Caution is advised when extrapolating findings from RBL-2H3 cells to all mast cell degranulation phenomena.
