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Updated: Jul 5, 2026
Isolation of Functional Cardiac Immune Cells
Published on: December 5, 2011
Isolation of cardiac mast cells in experimental Trypanosoma cruzi infection
M Meuser-Batista1, J R Correa, M J Soares
1Laboratório de Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro (RJ), Brazil. meuser@ioc.fiocruz.br
Abstract:
Mast cells (MC) secrete diverse pre-stored chemical mediators that are pivotal in inflammatory and fibrotic etiologies, such as Trypanosoma cruzi-induced myocardiopathy. However, due to reduced number of cardiac MC, in situ and in vitro identification, and difficult tissue isolation, these cells are rarely addressed. In this work we optimized the identification of cardiac and peritoneal MC and developed an enzymatic method for MC isolation using control and T. cruzi-infected mice. MC were identified by: toluidine blue (TB); alcian blue (AB)/safranin (S); AB or a mixed solution composed by AB/S/TB. Previous evaluations of cardiac MC in T. cruzi infection were based on TB staining and our results using AB/S/TB solution showed an increase in, at least, five times the detection of MC. This mixed solution may improve the identification of MC populations also from skin, mucosa and tissues that are infected by other pathogens or under the influence of chronic inflammation, leading to more precise results. Furthermore, the appropriate combination of samples (frozen/unfixed/thick slices) and staining protocols can assure the best evaluation of MC. We have also isolated cardiac MC using collagenase and developed a highly efficient 60%/70% Percoll-graded protocol that enriched in, at least, 95% the population of cardiac MC.
Insights
Researchers optimized mast cell (MC) identification and isolation from cardiac tissue, significantly improving detection in Trypanosoma cruzi infection models. This new method enhances understanding of inflammatory and fibrotic diseases.
Area of Science:
- Immunology
- Pathology
- Cell Biology
Background:
- Mast cells (MCs) are crucial in inflammation and fibrosis, implicated in conditions like Trypanosoma cruzi-induced myocardiopathy.
- Cardiac MCs are challenging to study due to low numbers, difficult in situ identification, and complex tissue isolation procedures.
Purpose of the Study:
- To optimize methods for identifying and isolating cardiac and peritoneal mast cells.
- To improve the detection of mast cells in the context of Trypanosoma cruzi infection.
Main Methods:
- Evaluated various staining techniques, including toluidine blue (TB), alcian blue (AB)/safranin (S), and a mixed AB/S/TB solution, for mast cell identification.
- Developed an enzymatic isolation method for cardiac mast cells using collagenase.
- Established a Percoll gradient centrifugation protocol (60%/70%) for efficient mast cell enrichment.
Main Results:
- The AB/S/TB staining solution increased mast cell detection by at least fivefold compared to traditional TB staining in Trypanosoma cruzi-infected mice.
- The optimized enzymatic digestion and Percoll gradient protocol yielded a highly enriched population of cardiac mast cells (≥95%).
Conclusions:
- The novel AB/S/TB staining method significantly enhances mast cell identification in cardiac tissues and potentially other inflammatory conditions.
- The developed isolation protocol provides a robust method for obtaining pure cardiac mast cell populations for further research.
