Cutting edge: Role of osteopontin and integrin αv in T cell-mediated anti-inflammatory responses in endotoxemia.
Journal Article (Journal Article)
The immune system is equipped with mechanisms that downregulate hyperinflammation to avoid collateral damage. We demonstrated recently that unprimed T cells downregulate macrophage TNF production through direct interaction with macrophages in the spleen during LPS endotoxemia. How T cell migration toward macrophages occurs upon LPS injection is still not clear. In this study, we demonstrate that secreted osteopontin (sOPN) plays a role in the T cell migration to initiate the suppression of hyperinflammation during endotoxemia. Osteopontin levels in splenic macrophages were upregulated 2 h after LPS treatment, whereas T cell migration toward macrophages was observed 3 h after treatment. Neutralization of sOPN and blockade of its receptor, integrin αv, significantly inhibited CD4(+) T cell migration and increased susceptibility to endotoxemia. Our study demonstrates that the sOPN/integrin αv axis, which induces T cell chemotaxis toward macrophages, is critical for suppressing hyperinflammation during the first 3 h of endotoxemia.
Full Text
Duke Authors
Cited Authors
- Inoue, M; Shinohara, ML
Published Date
- June 15, 2015
Published In
Volume / Issue
- 194 / 12
Start / End Page
- 5595 - 5598
PubMed ID
- 25972484
Pubmed Central ID
- 25972484
Electronic International Standard Serial Number (EISSN)
- 1550-6606
Digital Object Identifier (DOI)
- 10.4049/jimmunol.1500623
Language
- eng
Conference Location
- United States