Mast cells play a central role in inflammatory and allergic reactions by releasing histamine. Mast cell progenitors circulate in the blood before migrating to peripheral tissues, where they mature and differentiate. These progenitors are considered immature cells and only acquire their full functional capabilities upon entering tissues.

Mast cells are a unique immune cell type, interacting with various other cell types, including basophils, to coordinate immune responses. They are activated by a range of mechanisms, including the engagement of pattern recognition receptors that detect pathogens and activate mast cells in response to infection.

Upon activation, mast cells release cytokines and other inflammatory mediators, which contribute to immune cell recruitment at sites of inflammation. These mediators play a key role in orchestrating the immune response.

Mast cells are involved in a wide range of diseases, including allergic disorders, severe allergic reactions, several autoimmune diseases, inflammatory bowel disease, and parasitic infections. Their heterogeneity is influenced by tissue distribution, which affects their protease profiles and functional roles in different tissues.

In wound healing and tumor biology, mast cells release growth factors that influence tissue repair, tumor growth, and tumor progression. Mast cells are also present in the central nervous system, where they contribute to disease progression in neurological conditions.

To identify mast cells, researchers use specific markers such as CD117/c-Kit, Fc epsilon RI, and ENPP-3/CD203c, employing techniques like flow cytometry and immunophenotyping. These approaches are widely discussed in clinical immunology literature.

The development and maturation of mast cells depend on the action of transcription factors that regulate gene expression during differentiation. Mast cells also play a critical role in bridging innate and adaptive immunity, acting as a link between these two arms of the immune response.

CD23

CD23, a low-affinity IgE receptor, has gained attention as a potential mast cell marker in immunological studies. Its expression on mast cells varies across tissue types and activation states, offering researchers a nuanced tool for cell identification. Unlike traditional markers, CD23 may help distinguish mast cell subsets involved in allergic responses and chronic inflammation. Ongoing studies are exploring its role in mast cell regulation and signaling. This marker could support more targeted approaches in immunophenotyping and disease profiling within life sciences and biotechnology.

Figure 1. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD23 antibody [EPR3617] (ab92495).

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CD117

CD117, also known as c-Kit, is a transmembrane tyrosine kinase receptor commonly used to identify mast cells in tissue samples. It binds stem cell factor and plays a role in mast cell development, survival, and function. CD117 expression is typically strong in both resting and activated mast cells, making it a reliable marker in immunohistochemistry and flow cytometry. Its consistent presence across various tissues supports its use in allergy, oncology, and immunology research, where accurate mast cell detection is important for understanding disease mechanisms.

Figure 2. Flow Cytometry - Anti-c-Kit antibody [EPR25707-134] (ab283653).

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CD203c

CD203c is a membrane ectoenzyme expressed on human mast cells and basophils, often used in flow cytometry to assess cell activation. Its upregulation following allergen exposure makes it a useful marker in allergy diagnostics and immunological research. CD203c complements other markers like CD117 and FcεRI, helping to refine mast cell identification in complex tissue environments. Researchers studying hypersensitivity, asthma, and other immune-mediated conditions may find CD203c valuable for tracking mast cell behavior and activation profiles in both clinical and experimental settings.

Figure 3. Flow Cytometry - Anti-ENPP3/B10 antibody [EPR27349-72] (ab308453).

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CD64

CD64, also known as FcγRI, is a high-affinity receptor for IgG that has been investigated for its expression on mast cells under specific inflammatory conditions. While traditionally associated with monocytes and macrophages, CD64 may appear on mast cells during activation or in disease states, offering a potential marker for immune profiling. Its presence could support studies in immunopathology, allergy, and autoimmune disorders. Researchers exploring mast cell heterogeneity and function may consider CD64 as part of a broader panel for cell characterization.

Figure 4. Western blot - Anti-CD64 antibody [EPR4623] (ab109449).

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References

1. Hauswirth, A. W.  et al.  Expression of cell surface antigens on mast cells: mast cell phenotyping.  Methods Mol. Biol.  315, 77–90 (2006).
2. Sánchez-Muñoz, L., Teodósio, C., Morgado, J. M. & Escribano, L. Immunophenotypic characterization of bone marrow mast cells in mastocytosis and other mast cell disorders.  Methods Cell Biol.  103, 333–359 (2011).
3. Murphy, K. Janeway's Immunobiology. Garland Science (2012).
4. Engeroff, P. & Vogel, M. The role of CD23 in the regulation of allergic responses.  Allergy  76, 1981–1989 (2021).
5. Zhou, Y.  et al.  CD117-positive cells of the heart: progenitor cells or mast cells?  J. Histochem. Cytochem.  58, 309–316 (2010).
6. Grootens, J., Ungerstedt, J. S., Wu, C., Hamberg Levedahl, K., Nilsson, G. & Dahlin, J. S. CD203c distinguishes the erythroid and mast cell–basophil differentiation trajectories among human FcεRI+ bone marrow progenitors.  Allergy  75, 211–214 (2020).
7. Parente, R., Giudice, V., Cardamone, C., Serio, B., Selleri, C. & Triggiani, M. Secretory and membrane-associated biomarkers of mast cell activation and proliferation.  Int. J. Mol. Sci.  24, 7071 (2023).