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Bone marrow microenvironment facilitating dendritic cell: CD4 T cell interactions and maintenance of CD4 memory
Markus Feuerer1, Philipp Beckhove, Yolanda Mahnke
1Tumor Immunology Program, German Cancer Research Center, DKFZ, D-69120 Heidelberg, Germany.
International Journal of Oncology
|September 18, 2004
Summary
Bone marrow (BM) stroma supports T lymphocyte homing and activation via adhesion molecules. Interactions with dendritic cells in BM promote T cell expansion and memory, crucial for systemic immunity.
Area of Science:
- Immunology
- Hematology
- Cell Biology
Background:
- Bone marrow (BM) stroma expresses adhesion molecules (ICAM-1, VCAM-1, MadCAM-1, P-selectin) and co-stimulatory molecule CD80.
- T lymphocytes can home to the BM, but not the thymus, utilizing integrins LFA-1alpha and alpha4.
Purpose of the Study:
- To investigate T cell homing, activation, and expansion within the bone marrow microenvironment.
- To elucidate the role of dendritic cell (DC)-T cell interactions in the BM for immune responses.
Main Methods:
- Tracking of T cells homing to BM.
- Analysis of T cell interactions with BM-resident dendritic cells (DCs).
- Assessment of T cell proliferation and phenotype within BM.
Main Results:
- T cells successfully homed to BM via interactions between integrins and constitutively expressed adhesion molecules.
- Antigen-specific CD4 T cells formed clusters with BM-resident CD11c dendritic cells (DCs), leading to lymphoblast generation and clonal expansion.
- A majority of BM CD4 T cells exhibited a memory phenotype, indicating BM supports memory maintenance.
Conclusions:
- The BM microenvironment facilitates T cell homing, activation, and expansion.
- DC-T cell interactions within the BM are vital for immune responses to blood-borne antigens.
- BM plays a significant role in establishing systemic immunity and long-term immunological memory.