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Wen L, Marki A, Wang Z, Orecchioni M, Makings J, Billitti M, Wang E, Suthahar SSA, Kim K, Kiosses WB, Mikulski Z, Ley K. A humanized β 2 integrin knockin mouse reveals localized intra- and extravascular neutrophil integrin activation in vivo. Cell Rep 2022; 39:110876. [PMID: 35649374 PMCID: PMC10375464 DOI: 10.1016/j.celrep.2022.110876] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 03/28/2022] [Accepted: 05/04/2022] [Indexed: 11/24/2022] Open
Abstract
β2 integrins are leukocyte-specific adhesion molecules that are essential for leukocyte recruitment. The lack of tools for reporting β2 integrin activation in mice hindered the study of β2 integrin-related immune responses in vivo. Here, we generated a humanized β2 integrin knockin mouse strain by targeting the human β2 integrin coding sequence into the mouse Itgb2 locus to enable imaging of β2 integrin activation using the KIM127 (extension) and mAb24 (high-affinity) reporter antibodies. Using a CXCL1-induced acute inflammation model, we show the local dynamics of β2 integrin activation in arresting neutrophils in vivo in venules of the mouse cremaster muscle. Activated integrins are highly concentrated in a small area at the rear of arresting neutrophils in vivo. In a high-dose lipopolysaccharide model, we find that β2 integrins are activated in association with elevated neutrophil adhesion in lung and liver. Thus, these mice enable studies of β2 integrin activation in vivo.
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Affiliation(s)
- Lai Wen
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Alex Marki
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Zhihao Wang
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Marco Orecchioni
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Jeffrey Makings
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Monica Billitti
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Erpei Wang
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Sujit S A Suthahar
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Kenneth Kim
- Histopathology Core Facility, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - William B Kiosses
- Microscopy and Histology Core Facility, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Zbigniew Mikulski
- Microscopy and Histology Core Facility, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Klaus Ley
- Center for Autoimmunity and Inflammation, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA; Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
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