VLA-4 blockade suppresses endotoxin-induced uveitis: In vivo evidence for functional integrin up-regulation

A. Hafezi-Moghadam, K. Noda, L. Almulki, E. F. Iliaki, V. Poulaki, K. L. Thomas, T. Nakazawa, T. Hisatomi, J. W. Miller, E. S. Gragoudas

Research output: Contribution to journalArticle

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Abstract

Leukocyte adhesion to the vascular wall is a critical early step in the pathogenesis of inflammatory diseases and is mediated in part by the leukocyte integrin, VLA-4, which binds to endothelial vascular cell adhesion molecule (VCAM) -1. Here, we investigate VLA-4's role in endotoxin-induced uveitis (EIU). At various time points (6-48 h) after EIU induction, the severity of the inflammation was evaluated by quantifying cell and protein content in the aqueous fluid, firm leukocyte adhesion in the retinal vessels, and the number of extravasated leukocytes into the vitreous. Functional activation of VLA-4 in vivo was investigated in our previously introduced autoperfused micro flow chamber assay. Firm adhesion of EIU leukocytes to immobilized VCAM-1 under physiological blood flow conditions was significantly increased compared with normal controls (P<0.05), suggesting an important role for VLA-4 in EIU. VLA-4 blockade in vivo significantly suppressed all uveitis-related inflammatory parameters studied, decreasing the clinical score by 45% (P<0.01), protein content in the aqueous fluid by 21% (P<0.01), retinal leukostasis by 68% (P<0.01), and leukocyte accumulation in the vitreous by 75% (P<0.01). Our data provide novel evidence for functional up-regulation of VLA-4 during EIU and suggest VLA-4 blockade as a promising therapeutic strategy for treatment of acute inflammatory eye diseases.

Original languageEnglish
Pages (from-to)464-474
Number of pages11
JournalFASEB Journal
Volume21
Issue number2
DOIs
Publication statusPublished - Feb 1 2007

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Integrin alpha4beta1
Uveitis
Endotoxins
Integrins
Up-Regulation
Leukocytes
Adhesion
Vascular Cell Adhesion Molecule-1
Leukostasis
Immobilized Cells
Retinal Vessels
Fluids
Eye Diseases
Leukocyte Count
Blood Vessels
Assays
Proteins
Blood
Chemical activation
Inflammation

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics

Cite this

Hafezi-Moghadam, A., Noda, K., Almulki, L., Iliaki, E. F., Poulaki, V., Thomas, K. L., ... Gragoudas, E. S. (2007). VLA-4 blockade suppresses endotoxin-induced uveitis: In vivo evidence for functional integrin up-regulation. FASEB Journal, 21(2), 464-474. https://doi.org/10.1096/fj.06-6390com

VLA-4 blockade suppresses endotoxin-induced uveitis : In vivo evidence for functional integrin up-regulation. / Hafezi-Moghadam, A.; Noda, K.; Almulki, L.; Iliaki, E. F.; Poulaki, V.; Thomas, K. L.; Nakazawa, T.; Hisatomi, T.; Miller, J. W.; Gragoudas, E. S.

In: FASEB Journal, Vol. 21, No. 2, 01.02.2007, p. 464-474.

Research output: Contribution to journalArticle

Hafezi-Moghadam, A, Noda, K, Almulki, L, Iliaki, EF, Poulaki, V, Thomas, KL, Nakazawa, T, Hisatomi, T, Miller, JW & Gragoudas, ES 2007, 'VLA-4 blockade suppresses endotoxin-induced uveitis: In vivo evidence for functional integrin up-regulation', FASEB Journal, vol. 21, no. 2, pp. 464-474. https://doi.org/10.1096/fj.06-6390com
Hafezi-Moghadam A, Noda K, Almulki L, Iliaki EF, Poulaki V, Thomas KL et al. VLA-4 blockade suppresses endotoxin-induced uveitis: In vivo evidence for functional integrin up-regulation. FASEB Journal. 2007 Feb 1;21(2):464-474. https://doi.org/10.1096/fj.06-6390com
Hafezi-Moghadam, A. ; Noda, K. ; Almulki, L. ; Iliaki, E. F. ; Poulaki, V. ; Thomas, K. L. ; Nakazawa, T. ; Hisatomi, T. ; Miller, J. W. ; Gragoudas, E. S. / VLA-4 blockade suppresses endotoxin-induced uveitis : In vivo evidence for functional integrin up-regulation. In: FASEB Journal. 2007 ; Vol. 21, No. 2. pp. 464-474.
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