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Fu T, Sullivan DP, Gonzalez AM, Haynes ME, Dalal PJ, Rutledge NS, Tierney AL, Yescas JA, Weber EW, Muller WA. Mechanotransduction via endothelial adhesion molecule CD31 initiates transmigration and reveals a role for VEGFR2 in diapedesis. Immunity 2023; 56:2311-2324.e6. [PMID: 37643615 DOI: 10.1016/j.immuni.2023.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 05/04/2023] [Accepted: 08/02/2023] [Indexed: 08/31/2023]
Abstract
Engagement of platelet endothelial cell adhesion molecule 1 (PECAM, PECAM-1, CD31) on the leukocyte pseudopod with PECAM at the endothelial cell border initiates transendothelial migration (TEM, diapedesis). We show, using fluorescence lifetime imaging microscopy (FLIM), that physical traction on endothelial PECAM during TEM initiated the endothelial signaling pathway. In this role, endothelial PECAM acted as part of a mechanotransduction complex with VE-cadherin and vascular endothelial growth factor receptor 2 (VEGFR2), and this predicted that VEGFR2 was required for efficient TEM. We show that TEM required both VEGFR2 and the ability of its Y1175 to be phosphorylated, but not VEGF or VEGFR2 endogenous kinase activity. Using inducible endothelial-specific VEGFR2-deficient mice, we show in three mouse models of inflammation that the absence of endothelial VEGFR2 significantly (by ≥75%) reduced neutrophil extravasation by selectively blocking diapedesis. These findings provide a more complete understanding of the process of transmigration and identify several potential anti-inflammatory targets.
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Affiliation(s)
- Tao Fu
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - David P Sullivan
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Annette M Gonzalez
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Maureen E Haynes
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Prarthana J Dalal
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Nakisha S Rutledge
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Abigail L Tierney
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Julia A Yescas
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Evan W Weber
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - William A Muller
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
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Cabada Gomez DA, Chavez MI, Cobos AN, Gross RJ, Yescas JA, Balogh MA, Indriolo E. COPI complex isoforms are required for the early acceptance of compatible pollen grains in Arabidopsis thaliana. Plant Reprod 2020; 33:97-110. [PMID: 32277349 DOI: 10.1007/s00497-020-00387-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 03/11/2020] [Indexed: 05/04/2023]
Abstract
The Coat Protein I (COPI) complex is a seven-subunit coatomer complex consisting of the α, β, β', γ, δ, ε, and ζ proteins. In Arabidopsis thaliana, COPI is required for retrograde transport from the Golgi to the endoplasmic reticulum, Golgi maintenance, and cell plate formation. During compatible pollination, vesicle recruitment to the pollen contact point is required for pollen hydration and pollen tube penetration. Here, to identify other aspects of trafficking involved in the acceptance of compatible pollen by stigmatic papillae and to determine their roles in compatible pollination, we characterized knockout lines of several isoforms of the COPI complex, including α1-COP, γ-COP, and ε-COP. Specifically, we characterized pollen grain adherence, pollen tube penetration, and seed set in the mutants. Of the mutant lines examined, α1-cop had the most severe phenotypes, including altered compatible pollen grain adherence and tube germination and reduced seed set, whereas the other lines had milder phenotypes but visibly retarded compatible pollen acceptance. This is the first study demonstrating that COPI complex subunits are required for the acceptance of compatible pollen.
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Affiliation(s)
- Daniel A Cabada Gomez
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
- PULSe Graduate Program, Purdue University, 155 S. Grant St., West Lafayette, IN, 47907, USA
| | - M Isabella Chavez
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
- Cochlear Americas, 13059 East Peakview Ave, Centennial, CO, 80111, USA
| | - Alejandra N Cobos
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
| | - Roni J Gross
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
| | - Julia A Yescas
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
| | - Michael A Balogh
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA
| | - Emily Indriolo
- Department of Biology, New Mexico State University, 1200 S. Horseshoe Dr., Las Cruces, NM, 88003, USA.
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