Naive human T cells are activated and proliferate in response to the heme oxygenase-1 inhibitor tin mesoporphyrin.
Heme oxygenase-1 (HO-1) and its catabolic by-products have potent anti-inflammatory activity in many models of disease. It is not known, however, if HO-1 also plays a role in the homeostatic control of T cell activation and proliferation. We demonstrate here that the HO-1 inhibitor tin mesoporphyrin (SnMP) induces activation, proliferation, and maturation of naive CD4(+) and CD8(+) T cells via interactions with CD14(+) monocytes in vitro. This response is dependent upon interactions of T cells with MHC class I and II on the surface of CD14(+) monocytes. Furthermore, CD4(+)CD25(+)FoxP3(+) regulatory T cells were able to suppress this proliferation, even though their suppressive activity was itself impaired by SnMP. Given the magnitude of the Ag-independent T cell response induced by SnMP, we speculate that HO-1 plays an important role in dampening nonspecific T cell activation. Based on these findings, we propose a potential role for HO-1 in the control of naive T cell homeostatic proliferation.
Duke Scholars
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- T-Lymphocytes
- Monocytes
- Metalloporphyrins
- Lymphocyte Activation
- Lipopolysaccharide Receptors
- Immunology
- Humans
- Heme Oxygenase-1
- Flow Cytometry
- Enzyme Inhibitors
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- T-Lymphocytes
- Monocytes
- Metalloporphyrins
- Lymphocyte Activation
- Lipopolysaccharide Receptors
- Immunology
- Humans
- Heme Oxygenase-1
- Flow Cytometry
- Enzyme Inhibitors