Naive human T cells are activated and proliferate in response to the heme oxygenase-1 inhibitor tin mesoporphyrin.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Burt, TD; Seu, L; Mold, JE; Kappas, A; McCune, JM

Published Date

  • November 1, 2010

Published In

Volume / Issue

  • 185 / 9

Start / End Page

  • 5279 - 5288

PubMed ID

  • 20921523

Pubmed Central ID

  • PMC3314532

Electronic International Standard Serial Number (EISSN)

  • 1550-6606

Digital Object Identifier (DOI)

  • 10.4049/jimmunol.0903127


  • eng

Conference Location

  • United States