Beta1 integrins differentially control extravasation of inflammatory cell subsets into the CNS during autoimmunity

Bauer, Martina; Brakebusch, Cord; Coisne, Caroline; Sixt, Michael; Wekerle, Hartmut; Engelhardt, Britta; Fässler, Reinhard (2009). Beta1 integrins differentially control extravasation of inflammatory cell subsets into the CNS during autoimmunity. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 106(6), pp. 1920-5. Washington, D.C.: National Academy of Sciences NAS 10.1073/pnas.0808909106

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Inhibiting the alpha(4) subunit of the integrin heterodimers alpha(4)beta(1) and alpha(4)beta(7) with the monoclonal antibody natalizumab is an effective treatment for multiple sclerosis (MS). However, the pharmacological action of natalizumab is not understood conclusively. Previous studies suggested that natalizumab inhibits activation, proliferation, or extravasation of inflammatory cells. To specify which mechanisms, cell types, and alpha(4) heterodimers are affected by the antibody treatment, we studied MS-like experimental autoimmune encephalomyelitis (EAE) in mice lacking the beta(1)-integrin gene either in all hematopoietic cells or selectively in T lymphocytes. Our results show that T cells critically rely on beta(1) integrins to accumulate in the central nervous system (CNS) during EAE, whereas CNS infiltration of beta(1)-deficient myeloid cells remains unaffected, suggesting that T cells are the main target of anti-alpha(4)-antibody blockade. We demonstrate that beta(1)-integrin expression on encephalitogenic T cells is critical for EAE development, and we therefore exclude alpha(4)beta(7) as a target integrin of the antibody treatment. T cells lacking beta(1) integrin are unable to firmly adhere to CNS endothelium in vivo, whereas their priming and expansion remain unaffected. Collectively, these results suggest that the primary action of natalizumab is interference with T cell extravasation via inhibition of alpha(4)beta(1) integrins.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Theodor Kocher Institute
UniBE Contributor:	Coisne, Caroline Marie, Engelhardt, Britta
ISSN:	0027-8424
Publisher:	National Academy of Sciences NAS
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:13
Last Modified:	05 Dec 2022 14:22
Publisher DOI:	10.1073/pnas.0808909106
PubMed ID:	19179279
Web of Science ID:	000263252500046
URI:	https://boris.unibe.ch/id/eprint/32147 (FactScience: 197074)