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Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
Published on: September 19, 2013
Isolation of myeloid dendritic cells and epithelial cells from human thymus
Christina Stoeckle1, Ioanna A Rota, Eva Tolosa
1Department of General Neurology, Hertie Institute for Clinical Brain Research.
Insights
This protocol efficiently isolates rare dendritic cells (DC) and thymic epithelial cells (TEC) from human thymus. These purified cells enable further characterization of their distinct roles in thymic selection.
Area of Science:
- Immunology
- Cell Biology
- Protocols and Methods
Background:
- Dendritic cells (DC) and thymic epithelial cells (TEC) are key antigen-presenting cells (APCs) in the human thymus.
- These APCs play critical, distinct roles in thymic selection processes.
- Their low frequency and distinct microenvironments necessitate efficient isolation methods.
Purpose of the Study:
- To provide a detailed protocol for the isolation of human thymic DCs and TECs.
- To enable downstream characterization of these cell populations for biological studies.
- To establish a reproducible method for obtaining sufficient cell numbers.
Main Methods:
- Mechanical disruption and enzymatic digestion of thymic tissue.
- Percoll density gradient centrifugation for cell enrichment.
- Magnetic cell sorting for myeloid DC isolation (CD11c+).
- Fluorescence-activated cell sorting (FACS) for TEC isolation (mTEC, cTEC) after hematopoietic cell depletion (CD45hi).
Main Results:
- A robust protocol yielding purified populations of myeloid DCs and TECs (mTEC, cTEC).
- The method effectively isolates low-frequency cell types from human thymus.
- Isolated cells are suitable for diverse downstream molecular and cellular analyses.
Conclusions:
- This protocol offers an efficient and reproducible method for isolating human thymic DCs and TECs.
- The availability of purified cells facilitates deeper understanding of thymic immunity and selection.
- The method supports various applications in immunology and cell biology research.
Abstract:
In this protocol we provide a method to isolate dendritic cells (DC) and epithelial cells (TEC) from the human thymus. DC and TEC are the major antigen presenting cell (APC) types found in a normal thymus and it is well established that they play distinct roles during thymic selection. These cells are localized in distinct microenvironments in the thymus and each APC type makes up only a minor population of cells. To further understand the biology of these cell types, characterization of these cell populations is highly desirable but due to their low frequency, isolation of any of these cell types requires an efficient and reproducible procedure. This protocol details a method to obtain cells suitable for characterization of diverse cellular properties. Thymic tissue is mechanically disrupted and after different steps of enzymatic digestion, the resulting cell suspension is enriched using a Percoll density centrifugation step. For isolation of myeloid DC (CD11c(+)), cells from the low-density fraction (LDF) are immunoselected by magnetic cell sorting. Enrichment of TEC populations (mTEC, cTEC) is achieved by depletion of hematopoietic (CD45(hi)) cells from the low-density Percoll cell fraction allowing their subsequent isolation via fluorescence activated cell sorting (FACS) using specific cell markers. The isolated cells can be used for different downstream applications.
