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Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
Published on: September 20, 2013
CD4 and CD8 expression by human and mouse thymic dendritic cells
1Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia.
Insights
Human and mouse thymic dendritic cells (DC) share similarities in morphology and CD11c expression but differ significantly in CD4 and CD8 expression. These differences highlight potential species-specific roles and susceptibility to infections like HIV.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial immune cells residing in lymphoid organs, including the thymus.
- Thymic DCs play a role in T-cell development and immune tolerance.
Purpose of the Study:
- To compare dendritic cells (DCs) from human and mouse thymus.
- To investigate species-specific differences in DC characteristics and potential functional implications.
Main Methods:
- Isolation of thymic DCs using enzymatic digestion, density gradient centrifugation, and immunomagnetic depletion.
- Flow cytometry analysis for cell surface marker expression (CD4, CD8, CD11c, MHC class II).
Main Results:
- Comparable yields and similar morphology of human and mouse thymic DCs.
- Both human and mouse thymic DCs express high levels of CD11c and MHC class II.
- Human thymic DCs predominantly express CD4, while mouse thymic DCs express CD8.
- Human thymic DCs are larger than mouse thymic DCs.
Conclusions:
- Significant species-specific differences exist in CD4 and CD8 expression on thymic DCs.
- These differences may indicate distinct roles for thymic DCs in human versus mouse immune systems.
- Human thymic DCs, with their CD4 expression, could be potential targets for HIV infection.
Abstract:
Dendritic cells (DC) from human and mouse thymus were compared. DC from both sources were isolated by digestion with collagenase, disruption of cellular complexes with a chelating agent, selection of light density cells, immunomagnetic bead depletion of other cell types (without depletion with anti-CD4 or anti-CD8) and finally sorting for cells expressing high levels of class II MHC. Yields of DC from human and mouse thymus were comparable (around 1 DC/10(3) thymocytes), they displayed similar DC morphology, and both showed strong expression of CD11c. DC from the human thymus all expressed very high levels of CD4 but low levels of CD8. In contrast, DC from the mouse thymus expressed high levels of CD8 but only low levels of CD4. Human thymic DC were also substantially larger than mouse thymic DC. The biological significance of CD4 and CD8 expression by DC is discussed in view of this major species difference and the possibility that human thymic DC may be targets for HIV infection.
