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Updated: Aug 9, 2026
On-Chip Endothelial Inflammatory Phenotyping
Published on: July 22, 2012
Phenotypic characterization of the human mast-cell line HMC-1
G Nilsson1, T Blom, M Kusche-Gullberg
1Department of Pathology, University of Uppsala, Sweden.
Insights
The HMC-1 cell line, a mast cell leukaemia model, expresses key mast cell markers like Kit and active beta-tryptase. Differentiation agents induced only minor changes in its hematopoietic cell phenotype.
Area of Science:
- Hematology
- Cell Biology
- Immunology
Background:
- The HMC-1 cell line is a valuable model for human mast cells, originating from mast cell leukaemia.
- Characterizing its phenotype is crucial for understanding mast cell biology and potential therapeutic targets.
Purpose of the Study:
- To comprehensively characterize the expression of hematopoietic cell markers in the HMC-1 cell line.
- To investigate the differentiation potential of HMC-1 cells upon stimulation with specific agents.
Main Methods:
- Flow cytometry and immunocytochemistry for marker expression analysis.
- Reverse transcription polymerase chain reaction (RT-PCR) for mRNA analysis.
- Enzyme-histochemistry to assess enzyme activity.
Main Results:
- HMC-1 cells expressed mast cell markers, including high Kit levels and enzymatically active beta-tryptase.
- Cells showed expression of monocyte/macrophage marker CD68 and eosinophilic/basophilic differentiation marker Charcot-Leyden crystal.
- Differentiation agents induced only moderate changes, without inducing monocyte/granulocyte markers or Fc epsilon RI alpha-chain expression.
Conclusions:
- HMC-1 cells represent a useful model for studying mast cell-specific markers and beta-tryptase activity.
- The cell line exhibits a mixed phenotype with limited response to differentiation stimuli, highlighting its unique characteristics.
Abstract:
The cell line HMC-1, derived from a patient with mast cell leukaemia, is the only established cell line exhibiting a phenotype similar to that of human mast cells. This paper reports on a detailed characterization of the expression of a panel of markers for various types of immature and mature haematopoietic cells in the HMC-1. We also studied the potential of HMC-1 to differentiate upon treatment with conditioned media from the human T-cell line Mo, retinoic acid or DMSO. HMC-1 was found to express several mast cell-related markers. A high expression of Kit, the receptor for stem-cell factor, was detected. The majority of the cells were stained with a MoAb against the mast cell-specific serine protease tryptase. Of particular interest was the finding that beta-tryptase mRNA, but not alpha-tryptase mRNA, was expressed in HMC-1. Using enzyme-histochemistry we were able to show that the beta-tryptase was enzymatically active, indicating that tryptase can form active homotetramers. Both heparin and chondroitin sulfate were found to be present in approximately equal amounts. HMC-1 lacked surface expression of the high-affinity IgE receptor, which was confirmed by the absence of mRNA of the alpha- and beta-chains of the IgE-receptor complex. However, a strong expression of the gamma-chain of the IgE-receptor complex was detected. A positive staining of the monocyte/macrophage marker CD68 was obtained, as well as a strong hybridization signal for the eosinophilic/basophilic-related differentiation marker the Charcot-Leyden crystal. Treatment of HMC-1 with conditioned media from the human T-cell line Mo, retinoic acid or DMSO induced only moderate changes in the surface or intracellular expression of the studied markers. The agents tested neither induced any of the monocyte/granulocyte markers examined, nor expression of the Fc epsilon RI alpha-chain.
